import { useCallback, useEffect, useMemo, useState } from "react";
import {
  Archive,
  Boxes,
  Building2,
  Eye,
  Inbox,
  Pencil,
  Plus,
  RefreshCw,
  Rocket,
  Save,
  Trash2
} from "lucide-react";
import {
  ActionBlockerHint,
  AdminPageLayout,
  Button,
  ConfirmDialog,
  Dialog,
  DocumentationHelpLink,
  FormField,
  IconButton,
  MetricCard,
  SegmentedControl,
  SelectionList,
  SelectionListItem,
  StatusBadge,
  ToggleSwitch,
  i18nMessage,
  useUnsavedChanges,
  useUnsavedDraftGuard,
  type ApiSettings
} from "@govoplan/core-webui";
import {
  archivePostbox,
  createExactPostbox,
  createPostboxTemplate,
  listAdminPostboxes,
  listPostboxOrganizationTargets,
  listPostboxTemplates,
  materializePostboxTemplate,
  previewPostboxTemplate,
  publishPostboxTemplate,
  retirePostboxTemplate,
  revisePostboxTemplate,
  type PostboxDirectoryItem,
  type PostboxExactCreatePayload,
  type PostboxOrganizationFunction,
  type PostboxOrganizationStructure,
  type PostboxOrganizationUnit,
  type PostboxRoutingPolicy,
  type PostboxTemplate,
  type PostboxTemplateCreatePayload,
  type PostboxTemplatePreview,
  type PostboxTemplateRevisionPayload
} from "../../api/postbox";
import {
  POSTBOX_ADMIN_DOCUMENTATION,
  POSTBOX_FIELD_DOCUMENTATION,
  POSTBOX_INTERFACE_I18N,
  postboxBusyReason
} from "./interfacePatterns";


type AdminMode = "templates" | "postboxes";
type TemplateDraft = PostboxTemplateCreatePayload & { templateId: string };
type ExactDraft = PostboxExactCreatePayload;
type MaterializeDraft = {
  templateId: string;
  organization_unit_id: string;
  function_id: string;
  context_key: string;
};

const routingDefaults = (): PostboxRoutingPolicy => ({
  linked_copy: {
    enabled: false,
    structure_id: null,
    relation_type_ids: [],
    max_depth: 1,
    stop_unit_id: null,
    stop_unit_type_id: null,
    target_function_type_id: null,
    target_template_id: null,
    fanout: "nearest",
    allowed_classifications: ["internal"],
    allowed_producer_modules: [],
    require_expiry: false,
    max_retention_days: null
  },
  attention: {
    mode: "none",
    delay_minutes: null
  },
  shared_visibility: {
    mode: "none"
  }
});

const templateDefaults = (): TemplateDraft => ({
  templateId: "",
  slug: "",
  name: "",
  description: "",
  function_type_id: null,
  scope_kind: "tenant",
  scope_id: null,
  scope_structure_id: null,
  scope_relation_type_ids: [],
  name_pattern: "{unit_name} / {function_name}",
  address_pattern: "{template_slug}.{unit_slug}.{function_slug}",
  classification: "internal",
  allow_vacant_delivery: true,
  portal_visible: false,
  routing_policy: routingDefaults()
});

const exactDefaults = (): ExactDraft => ({
  name: "",
  description: "",
  organization_unit_id: "",
  function_id: "",
  address_key: "",
  classification: "internal",
  portal_visible: false
});

export default function PostboxAdminPanel({
  settings,
  canManageBindings,
  canManageTemplates
}: {
  settings: ApiSettings;
  canManageBindings: boolean;
  canManageTemplates: boolean;
}) {
  const [mode, setMode] = useState<AdminMode>(
    canManageTemplates ? "templates" : "postboxes"
  );
  const [templates, setTemplates] = useState<PostboxTemplate[]>([]);
  const [postboxes, setPostboxes] = useState<PostboxDirectoryItem[]>([]);
  const [units, setUnits] = useState<PostboxOrganizationUnit[]>([]);
  const [structures, setStructures] = useState<PostboxOrganizationStructure[]>([]);
  const [selectedTemplateId, setSelectedTemplateId] = useState("");
  const [selectedPostboxId, setSelectedPostboxId] = useState("");
  const [loading, setLoading] = useState(true);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState("");
  const [success, setSuccess] = useState("");
  const [templateDialogOpen, setTemplateDialogOpen] = useState(false);
  const [templateDraft, setTemplateDraft] = useState<TemplateDraft>(templateDefaults);
  const [templateBaseline, setTemplateBaseline] = useState<TemplateDraft>(templateDefaults);
  const [templatePreview, setTemplatePreview] = useState<PostboxTemplatePreview | null>(null);
  const [templatePreviewLoading, setTemplatePreviewLoading] = useState(false);
  const [exactDialogOpen, setExactDialogOpen] = useState(false);
  const [exactDraft, setExactDraft] = useState<ExactDraft>(exactDefaults);
  const [exactBaseline, setExactBaseline] = useState<ExactDraft>(exactDefaults);
  const [materializeDialogOpen, setMaterializeDialogOpen] = useState(false);
  const [materializeDraft, setMaterializeDraft] = useState<MaterializeDraft>({
    templateId: "",
    organization_unit_id: "",
    function_id: "",
    context_key: ""
  });
  const [materializeBaseline, setMaterializeBaseline] = useState<MaterializeDraft>({
    templateId: "",
    organization_unit_id: "",
    function_id: "",
    context_key: ""
  });
  const [archiveTarget, setArchiveTarget] = useState<PostboxDirectoryItem | null>(null);
  const [retireTarget, setRetireTarget] = useState<PostboxTemplate | null>(null);
  const { requestDiscard } = useUnsavedChanges();

  const selectedTemplate = useMemo(
    () => templates.find((template) => template.id === selectedTemplateId) ?? templates[0] ?? null,
    [templates, selectedTemplateId]
  );
  const selectedPostbox = useMemo(
    () => postboxes.find((postbox) => postbox.id === selectedPostboxId) ?? postboxes[0] ?? null,
    [postboxes, selectedPostboxId]
  );
  const functionTypes = useMemo(() => {
    const values = new Map<string, string>();
    for (const unit of units) {
      for (const fn of unit.functions) {
        if (fn.function_type_id && !values.has(fn.function_type_id)) {
          values.set(fn.function_type_id, fn.name);
        }
      }
    }
    return [...values].map(([id, name]) => ({ id, name }));
  }, [units]);
  const unitTypes = useMemo(() => {
    const values = new Map<string, string>();
    for (const unit of units) {
      if (unit.unit_type_id && !values.has(unit.unit_type_id)) {
        values.set(unit.unit_type_id, unit.name);
      }
    }
    return [...values].map(([id, example]) => ({ id, example }));
  }, [units]);
  const templateDirty = templateDialogOpen && draftKey(templateDraft) !== draftKey(templateBaseline);
  const exactDirty = exactDialogOpen && draftKey(exactDraft) !== draftKey(exactBaseline);
  const materializeDirty = materializeDialogOpen && draftKey(materializeDraft) !== draftKey(materializeBaseline);

  useUnsavedDraftGuard({
    dirty: templateDirty || exactDirty || materializeDirty,
    title: "Unsaved Postbox administration draft",
    message: "Save or discard the open Postbox administration draft before leaving this surface.",
    onSave: saveActiveDraft,
    onDiscard: discardAdminDraft
  });

  const load = useCallback(async () => {
    setLoading(true);
    setError("");
    try {
      const [nextTemplates, nextPostboxes, organizationTargets] = await Promise.all([
        canManageTemplates ? listPostboxTemplates(settings) : Promise.resolve([]),
        canManageBindings ? listAdminPostboxes(settings) : Promise.resolve([]),
        listPostboxOrganizationTargets(settings)
      ]);
      setTemplates(nextTemplates);
      setPostboxes(nextPostboxes);
      setUnits(organizationTargets.units);
      setStructures(organizationTargets.structures);
      setSelectedTemplateId((current) =>
        current && nextTemplates.some((template) => template.id === current)
          ? current
          : nextTemplates[0]?.id ?? ""
      );
      setSelectedPostboxId((current) =>
        current && nextPostboxes.some((postbox) => postbox.id === current)
          ? current
          : nextPostboxes[0]?.id ?? ""
      );
    } catch (loadError) {
      setError(errorMessage(loadError));
    } finally {
      setLoading(false);
    }
  }, [canManageBindings, canManageTemplates, settings]);

  useEffect(() => {
    void load();
  }, [load]);

  function openNewTemplate() {
    const next = templateDefaults();
    setTemplatePreview(null);
    setTemplateDraft(next);
    setTemplateBaseline(next);
    setTemplateDialogOpen(true);
  }

  function openTemplateRevision(template: PostboxTemplate) {
    const revision = currentRevision(template);
    if (!revision) return;
    const next = {
      templateId: template.id,
      slug: template.slug,
      name: template.name,
      description: template.description || "",
      function_type_id: revision.function_type_id ?? null,
      scope_kind: revision.scope_kind,
      scope_id: revision.scope_id ?? null,
      scope_structure_id: revision.scope_structure_id ?? null,
      scope_relation_type_ids: revision.scope_relation_type_ids ?? [],
      name_pattern: revision.name_pattern,
      address_pattern: revision.address_pattern,
      classification: revision.classification,
      allow_vacant_delivery: revision.allow_vacant_delivery,
      portal_visible: revision.portal_visible,
      routing_policy: revision.routing_policy ?? routingDefaults()
    };
    setTemplatePreview(null);
    setTemplateDraft(next);
    setTemplateBaseline(next);
    setTemplateDialogOpen(true);
  }

  async function saveTemplate(): Promise<boolean> {
    setBusy(true);
    setError("");
    setSuccess("");
    try {
      if (templateDraft.templateId) {
        const currentTemplate = templates.find(
          (item) => item.id === templateDraft.templateId
        );
        if (!currentTemplate) throw new Error("The template is no longer available.");
        await revisePostboxTemplate(
          settings,
          currentTemplate,
          revisionPayload(templateDraft)
        );
        setSuccess("A new immutable template revision was created.");
      } else {
        await createPostboxTemplate(settings, {
          slug: templateDraft.slug,
          name: templateDraft.name,
          description: templateDraft.description || null,
          ...revisionPayload(templateDraft)
        });
        setSuccess("Postbox template created as a draft.");
      }
      setTemplateBaseline(templateDraft);
      setTemplateDialogOpen(false);
      await load();
      return true;
    } catch (actionError) {
      setError(errorMessage(actionError));
      return false;
    } finally {
      setBusy(false);
    }
  }

  async function previewTemplate() {
    setTemplatePreviewLoading(true);
    setError("");
    try {
      const preview = await previewPostboxTemplate(settings, {
        slug: templateDraft.slug,
        name: templateDraft.name,
        description: templateDraft.description || null,
        ...revisionPayload(templateDraft),
        template_id: templateDraft.templateId || null,
        limit: 200
      });
      setTemplatePreview(preview);
    } catch (actionError) {
      setTemplatePreview(null);
      setError(errorMessage(actionError));
    } finally {
      setTemplatePreviewLoading(false);
    }
  }

  async function publishSelected() {
    if (!selectedTemplate) return;
    setBusy(true);
    setError("");
    setSuccess("");
    try {
      await publishPostboxTemplate(
        settings,
        selectedTemplate,
        selectedTemplate.current_revision
      );
      setSuccess(i18nMessage("i18n:govoplan-postbox.published_revision_message", {
        revision: selectedTemplate.current_revision
      }));
      await load();
    } catch (actionError) {
      setError(errorMessage(actionError));
    } finally {
      setBusy(false);
    }
  }

  function openExact() {
    const unit = units.find((item) => item.functions.length);
    const next = {
      ...exactDefaults(),
      organization_unit_id: unit?.id ?? "",
      function_id: unit?.functions[0]?.id ?? ""
    };
    setExactDraft(next);
    setExactBaseline(next);
    setExactDialogOpen(true);
  }

  async function saveExact(): Promise<boolean> {
    setBusy(true);
    setError("");
    setSuccess("");
    try {
      await createExactPostbox(settings, {
        ...exactDraft,
        description: exactDraft.description || null,
        address_key: exactDraft.address_key || null
      });
      setExactBaseline(exactDraft);
      setExactDialogOpen(false);
      setSuccess("Exact function-bound Postbox created.");
      await load();
      return true;
    } catch (actionError) {
      setError(errorMessage(actionError));
      return false;
    } finally {
      setBusy(false);
    }
  }

  function openMaterialize(template: PostboxTemplate) {
    const revision = currentRevision(template);
    const compatible = compatibleTargets(units, revision?.function_type_id);
    const unit = compatible[0];
    const next = {
      templateId: template.id,
      organization_unit_id: unit?.id ?? "",
      function_id: unit?.functions[0]?.id ?? "",
      context_key: ""
    };
    setMaterializeDraft(next);
    setMaterializeBaseline(next);
    setMaterializeDialogOpen(true);
  }

  async function materialize(): Promise<boolean> {
    setBusy(true);
    setError("");
    setSuccess("");
    try {
      await materializePostboxTemplate(settings, materializeDraft.templateId, {
        organization_unit_id: materializeDraft.organization_unit_id,
        function_id: materializeDraft.function_id,
        context_key: materializeDraft.context_key || null
      });
      setMaterializeBaseline(materializeDraft);
      setMaterializeDialogOpen(false);
      setSuccess("Stable Postbox address resolved and materialized.");
      await load();
      return true;
    } catch (actionError) {
      setError(errorMessage(actionError));
      return false;
    } finally {
      setBusy(false);
    }
  }

  async function confirmArchive() {
    if (!archiveTarget) return;
    setBusy(true);
    setError("");
    setSuccess("");
    try {
      await archivePostbox(settings, archiveTarget);
      setSuccess("Postbox archived. Messages and delivery evidence were retained.");
      setArchiveTarget(null);
      await load();
    } catch (actionError) {
      setError(errorMessage(actionError));
    } finally {
      setBusy(false);
    }
  }

  async function confirmRetire() {
    if (!retireTarget) return;
    setSelectedTemplateId(retireTarget.id);
    setBusy(true);
    setError("");
    setSuccess("");
    try {
      await retirePostboxTemplate(settings, retireTarget);
      setSuccess("Postbox template retired. Existing addresses remain durable.");
      setRetireTarget(null);
      await load();
    } catch (actionError) {
      setError(errorMessage(actionError));
    } finally {
      setBusy(false);
    }
  }

  function saveActiveDraft(): Promise<boolean> {
    if (templateDirty) return saveTemplate();
    if (exactDirty) return saveExact();
    if (materializeDirty) return materialize();
    return Promise.resolve(true);
  }

  function discardAdminDraft() {
    if (templateDialogOpen) {
      setTemplateDraft(templateBaseline);
      setTemplateDialogOpen(false);
    }
    if (exactDialogOpen) {
      setExactDraft(exactBaseline);
      setExactDialogOpen(false);
    }
    if (materializeDialogOpen) {
      setMaterializeDraft(materializeBaseline);
      setMaterializeDialogOpen(false);
    }
  }

  function closeTemplateDialog() {
    const close = () => {
      setTemplateDraft(templateBaseline);
      setTemplateDialogOpen(false);
    };
    if (templateDirty) requestDiscard(close);
    else close();
  }

  function closeExactDialog() {
    const close = () => {
      setExactDraft(exactBaseline);
      setExactDialogOpen(false);
    };
    if (exactDirty) requestDiscard(close);
    else close();
  }

  function closeMaterializeDialog() {
    const close = () => {
      setMaterializeDraft(materializeBaseline);
      setMaterializeDialogOpen(false);
    };
    if (materializeDirty) requestDiscard(close);
    else close();
  }

  return (
    <AdminPageLayout
      title="Postboxes"
      description="Manage durable organization-function addresses and reusable templates."
      loading={loading}
      error={error}
      success={success}
      className="postbox-admin-page"
      actions={
        <>
          <IconButton
            label="Refresh"
            icon={<RefreshCw size={16} />}
            onClick={() => requestDiscard(() => void load())}
            disabled={loading || busy}
            disabledReason={postboxBusyReason(loading, busy)}
          />
          <DocumentationHelpLink reference={POSTBOX_ADMIN_DOCUMENTATION} />
          {mode === "templates" && canManageTemplates ? (
            <Button variant="primary" onClick={openNewTemplate} disabled={busy} disabledReason={postboxBusyReason(false, busy)}>
              <Plus size={16} /> New template
            </Button>
          ) : null}
          {mode === "postboxes" && canManageBindings ? (
            <Button variant="primary" onClick={openExact} disabled={busy || !units.some((unit) => unit.functions.length)} disabledReason={postboxBusyReason(false, busy) ?? (!units.some((unit) => unit.functions.length) ? POSTBOX_INTERFACE_I18N.organizationTargetSummary : undefined)}>
              <Plus size={16} /> Exact postbox
            </Button>
          ) : null}
        </>
      }
    >
      <SegmentedControl
        value={mode}
        onChange={(value) => setMode(value as AdminMode)}
        options={[
          ...(canManageTemplates ? [{ id: "templates", label: "Templates" }] : []),
          ...(canManageBindings ? [{ id: "postboxes", label: "Postboxes" }] : [])
        ]}
        ariaLabel="Postbox administration section"
      />
      {mode === "postboxes" && !units.some((unit) => unit.functions.length) ? (
        <ActionBlockerHint
          reason={{
            summary: POSTBOX_INTERFACE_I18N.organizationTargetSummary,
            requiredAction: POSTBOX_INTERFACE_I18N.organizationTargetAction,
            actor: POSTBOX_INTERFACE_I18N.organizationTargetActor,
            target: POSTBOX_INTERFACE_I18N.organizationTargetDestination
          }}
          labels={{
            requiredAction: POSTBOX_INTERFACE_I18N.requiredAction,
            actor: POSTBOX_INTERFACE_I18N.actor,
            target: POSTBOX_INTERFACE_I18N.destination
          }}
          documentation={POSTBOX_ADMIN_DOCUMENTATION}
        />
      ) : null}
      {mode === "templates" ? (
        <TemplateWorkspace
          templates={templates}
          selected={selectedTemplate}
          onSelect={setSelectedTemplateId}
          onRevise={openTemplateRevision}
          onPublish={() => void publishSelected()}
          onRetire={() => selectedTemplate && setRetireTarget(selectedTemplate)}
          onMaterialize={openMaterialize}
          busy={busy}
          canManageBindings={canManageBindings}
        />
      ) : (
        <PostboxWorkspace
          postboxes={postboxes}
          selected={selectedPostbox}
          onSelect={setSelectedPostboxId}
          onArchive={setArchiveTarget}
          busy={busy}
        />
      )}

      <TemplateDialog
        open={templateDialogOpen}
        draft={templateDraft}
        units={units}
        structures={structures}
        templates={templates}
        functionTypes={functionTypes}
        unitTypes={unitTypes}
        busy={busy}
        preview={templatePreview}
        previewLoading={templatePreviewLoading}
        onChange={(draft) => {
          setTemplateDraft(draft);
          setTemplatePreview(null);
        }}
        onPreview={() => void previewTemplate()}
        onClose={closeTemplateDialog}
        onSave={() => void saveTemplate()}
      />
      <ExactPostboxDialog
        open={exactDialogOpen}
        draft={exactDraft}
        units={units}
        busy={busy}
        onChange={setExactDraft}
        onClose={closeExactDialog}
        onSave={() => void saveExact()}
      />
      <MaterializeDialog
        open={materializeDialogOpen}
        draft={materializeDraft}
        template={templates.find((item) => item.id === materializeDraft.templateId) ?? null}
        units={units}
        busy={busy}
        onChange={setMaterializeDraft}
        onClose={closeMaterializeDialog}
        onSave={() => void materialize()}
      />
      <ConfirmDialog
        open={Boolean(archiveTarget)}
        title="Archive Postbox"
        message={
          archiveTarget
            ? i18nMessage("i18n:govoplan-postbox.archive_confirmation", { name: archiveTarget.name })
            : ""
        }
        confirmLabel="Archive"
        tone="danger"
        busy={busy}
        onConfirm={() => void confirmArchive()}
        onCancel={() => setArchiveTarget(null)}
      />
      <ConfirmDialog
        open={Boolean(retireTarget)}
        title="Retire Postbox template"
        message={retireTarget
          ? i18nMessage("i18n:govoplan-postbox.retire_template_confirmation", { name: retireTarget.name })
          : ""}
        confirmLabel="Retire"
        tone="danger"
        busy={busy}
        onConfirm={() => void confirmRetire()}
        onCancel={() => setRetireTarget(null)}
      />
    </AdminPageLayout>
  );
}

function TemplateWorkspace({
  templates,
  selected,
  onSelect,
  onRevise,
  onPublish,
  onRetire,
  onMaterialize,
  busy,
  canManageBindings
}: {
  templates: PostboxTemplate[];
  selected: PostboxTemplate | null;
  onSelect: (id: string) => void;
  onRevise: (template: PostboxTemplate) => void;
  onPublish: () => void;
  onRetire: () => void;
  onMaterialize: (template: PostboxTemplate) => void;
  busy: boolean;
  canManageBindings: boolean;
}) {
  const revision = selected ? currentRevision(selected) : null;
  return (
    <div className="postbox-admin-workspace">
      <aside className="postbox-admin-list">
        {!templates.length ? <p className="postbox-note">No Postbox templates.</p> : null}
        {templates.length ? (
          <SelectionList label="Postbox templates">
            {templates.map((template) => (
              <SelectionListItem
                key={template.id}
                selected={selected?.id === template.id}
                onClick={() => onSelect(template.id)}
              >
                <span className="postbox-item-title">
                  <strong>{template.name}</strong>
                  <StatusBadge status={template.status} />
                </span>
                <span className="postbox-item-context">
                  {template.slug} · {i18nMessage("i18n:govoplan-postbox.revision_label", { revision: template.current_revision })}
                </span>
              </SelectionListItem>
            ))}
          </SelectionList>
        ) : null}
      </aside>
      <section className="postbox-admin-detail">
        {selected && revision ? (
          <>
            <div className="postbox-admin-detail-heading">
              <div>
                <span className="postbox-detail-kicker">Template</span>
                <h2>{selected.name}</h2>
                <p>{selected.description || "No description."}</p>
              </div>
              <div className="button-row compact-actions">
                <Button
                  onClick={() => onRevise(selected)}
                  disabled={busy || selected.status === "retired"}
                  disabledReason={postboxBusyReason(false, busy) ?? (selected.status === "retired" ? POSTBOX_INTERFACE_I18N.retiredTemplate : undefined)}
                >
                  <Pencil size={16} /> New revision
                </Button>
                <Button
                  onClick={onPublish}
                  disabled={busy || selected.status === "retired" || Boolean(revision.published_at)}
                  disabledReason={postboxBusyReason(false, busy) ?? (selected.status === "retired" ? POSTBOX_INTERFACE_I18N.retiredTemplate : revision.published_at ? POSTBOX_INTERFACE_I18N.publishedRevision : undefined)}
                >
                  <Save size={16} /> Publish
                </Button>
                {canManageBindings ? (
                  <Button
                    onClick={() => onMaterialize(selected)}
                    disabled={busy || selected.status !== "published"}
                    disabledReason={postboxBusyReason(false, busy) ?? (selected.status !== "published" ? POSTBOX_INTERFACE_I18N.unpublishedTemplate : undefined)}
                  >
                    <Rocket size={16} /> Resolve address
                  </Button>
                ) : null}
                <Button
                  variant="danger"
                  onClick={onRetire}
                  disabled={busy || selected.status === "retired"}
                  disabledReason={postboxBusyReason(false, busy) ?? (selected.status === "retired" ? POSTBOX_INTERFACE_I18N.retiredTemplate : undefined)}
                >
                  <Trash2 size={16} /> Retire
                </Button>
              </div>
            </div>
            <dl className="postbox-admin-properties">
              <div><dt>Revision</dt><dd>{revision.revision}{revision.published_at ? " · Published" : " · Draft"}</dd></div>
              <div><dt>Function type</dt><dd>{revision.function_type_id || "Any function type"}</dd></div>
              <div><dt>Scope</dt><dd>{revision.scope_kind}{revision.scope_id ? ` · ${revision.scope_id}` : ""}</dd></div>
              <div><dt>Classification</dt><dd>{revision.classification}</dd></div>
              <div><dt>Vacant delivery</dt><dd>{revision.allow_vacant_delivery ? "Accepted" : "Blocked"}</dd></div>
              <div>
                <dt>Hierarchy copies</dt>
                <dd>
                  {revision.routing_policy.linked_copy.enabled
                    ? i18nMessage("i18n:govoplan-postbox.depth_label", {
                        fanout: revision.routing_policy.linked_copy.fanout,
                        depth: revision.routing_policy.linked_copy.max_depth
                      })
                    : "Disabled"}
                </dd>
              </div>
              <div>
                <dt>Vacancy escalation</dt>
                <dd>
                  {revision.routing_policy.attention.mode === "vacancy_escalation"
                    ? i18nMessage("i18n:govoplan-postbox.minutes_label", {
                        minutes: revision.routing_policy.attention.delay_minutes
                      })
                    : "Disabled"}
                </dd>
              </div>
              <div><dt>Encryption</dt><dd>{revision.encryption_profile}</dd></div>
              <div><dt>Name pattern</dt><dd>{revision.name_pattern}</dd></div>
              <div><dt>Address pattern</dt><dd>{revision.address_pattern}</dd></div>
            </dl>
            <div className="postbox-revision-history">
              <h3>Immutable revisions</h3>
              {selected.revisions.map((item) => (
                <div key={item.id}>
                  <strong>{i18nMessage("i18n:govoplan-postbox.revision_label", { revision: item.revision })}</strong>
                  <span>{item.classification} · {item.scope_kind}</span>
                  <StatusBadge
                    status={item.published_at ? "published" : "draft"}
                    label={item.published_at ? "Published" : "Draft"}
                  />
                </div>
              ))}
            </div>
          </>
        ) : (
          <div className="postbox-empty">
            <Boxes size={24} />
            <strong>Select a template</strong>
            <p>Published revisions lazily resolve stable unit-specific addresses.</p>
          </div>
        )}
      </section>
    </div>
  );
}

function PostboxWorkspace({
  postboxes,
  selected,
  onSelect,
  onArchive,
  busy
}: {
  postboxes: PostboxDirectoryItem[];
  selected: PostboxDirectoryItem | null;
  onSelect: (id: string) => void;
  onArchive: (postbox: PostboxDirectoryItem) => void;
  busy: boolean;
}) {
  return (
    <div className="postbox-admin-workspace">
      <aside className="postbox-admin-list">
        {!postboxes.length ? <p className="postbox-note">No materialized Postboxes.</p> : null}
        {postboxes.length ? (
          <SelectionList label="Materialized Postboxes">
            {postboxes.map((postbox) => (
              <SelectionListItem
                key={postbox.id}
                selected={selected?.id === postbox.id}
                onClick={() => onSelect(postbox.id)}
              >
                <span className="postbox-item-title">
                  <strong>{postbox.name}</strong>
                  <StatusBadge status={postbox.status} />
                </span>
                <span className="postbox-item-context">
                  {postbox.organization_unit_name} · {postbox.function_name}
                </span>
              </SelectionListItem>
            ))}
          </SelectionList>
        ) : null}
      </aside>
      <section className="postbox-admin-detail">
        {selected ? (
          <>
            <div className="postbox-admin-detail-heading">
              <div>
                <span className="postbox-detail-kicker">Postbox</span>
                <h2>{selected.name}</h2>
                <p>{selected.address}</p>
              </div>
              <Button
                variant="danger"
                onClick={() => onArchive(selected)}
                disabled={busy || selected.status !== "active"}
                disabledReason={postboxBusyReason(false, busy) ?? (selected.status !== "active" ? POSTBOX_INTERFACE_I18N.archivedPostbox : undefined)}
              >
                <Archive size={16} /> Archive
              </Button>
            </div>
            <dl className="postbox-admin-properties">
              <div><dt>Organization unit</dt><dd>{selected.organization_unit_name || "None"}</dd></div>
              <div><dt>Function</dt><dd>{selected.function_name || "None"}</dd></div>
              <div><dt>Address key</dt><dd>{selected.address_key}</dd></div>
              <div><dt>Classification</dt><dd>{selected.classification}</dd></div>
              <div><dt>Current holders</dt><dd>{selected.holder_count}</dd></div>
              <div><dt>Vacancy</dt><dd>{selected.vacant ? "Vacant" : "Staffed"}</dd></div>
              <div><dt>Context</dt><dd>{selected.context_key || "None"}</dd></div>
              <div><dt>Template revision</dt><dd>{selected.template_revision_id || "Exact Postbox"}</dd></div>
            </dl>
          </>
        ) : (
          <div className="postbox-empty">
            <Inbox size={24} />
            <strong>Select a Postbox</strong>
            <p>Materialized Postboxes remain durable through vacancy and reassignment.</p>
          </div>
        )}
      </section>
    </div>
  );
}

function TemplateDialog({
  open,
  draft,
  units,
  structures,
  templates,
  functionTypes,
  unitTypes,
  busy,
  preview,
  previewLoading,
  onChange,
  onPreview,
  onClose,
  onSave
}: {
  open: boolean;
  draft: TemplateDraft;
  units: PostboxOrganizationUnit[];
  structures: PostboxOrganizationStructure[];
  templates: PostboxTemplate[];
  functionTypes: Array<{ id: string; name: string }>;
  unitTypes: Array<{ id: string; example: string }>;
  busy: boolean;
  preview: PostboxTemplatePreview | null;
  previewLoading: boolean;
  onChange: (draft: TemplateDraft) => void;
  onPreview: () => void;
  onClose: () => void;
  onSave: () => void;
}) {
  const isRevision = Boolean(draft.templateId);
  const scopeOptions = draft.scope_kind === "unit_type"
    ? unitTypes.map((item) => ({ id: item.id, label: `${item.id} (${item.example})` }))
    : units.map((unit) => ({ id: unit.id, label: unit.name }));
  const linkedCopy = draft.routing_policy.linked_copy;
  const attention = draft.routing_policy.attention;
  const selectedScopeStructure = structures.find(
    (item) => item.id === draft.scope_structure_id
  );
  const selectedStructure = structures.find(
    (item) => item.id === linkedCopy.structure_id
  );
  const updateRouting = (routing_policy: PostboxRoutingPolicy) => {
    onChange({ ...draft, routing_policy });
  };
  const updateLinkedCopy = (
    next: Partial<PostboxRoutingPolicy["linked_copy"]>
  ) => {
    updateRouting({
      ...draft.routing_policy,
      linked_copy: {
        ...linkedCopy,
        ...next
      }
    });
  };
  const valid =
    draft.name.trim() &&
    draft.slug.trim() &&
    draft.name_pattern.trim() &&
    draft.address_pattern.trim() &&
    (draft.scope_kind === "tenant" || Boolean(draft.scope_id)) &&
    (draft.scope_kind !== "subtree" || Boolean(draft.scope_structure_id)) &&
    (
      !linkedCopy.enabled
      || Boolean(
        linkedCopy.structure_id
        && linkedCopy.target_function_type_id
        && linkedCopy.target_template_id
        && linkedCopy.allowed_classifications.length
        && linkedCopy.allowed_producer_modules.length
      )
    );
  return (
    <Dialog
      open={open}
      title={isRevision ? "Create template revision" : "New Postbox template"}
      className="postbox-dialog postbox-template-dialog"
      onClose={onClose}
      closeDisabled={busy}
      footer={
        <div className="button-row compact-actions">
          <Button
            onClick={onPreview}
            disabled={busy || previewLoading || !valid}
            disabledReason={postboxBusyReason(false, busy || previewLoading) ?? (!valid ? POSTBOX_INTERFACE_I18N.incompleteDraft : undefined)}
          >
            <Eye size={16} /> {previewLoading ? "Checking impact" : "Preview impact"}
          </Button>
          <Button onClick={onClose} disabled={busy} disabledReason={postboxBusyReason(false, busy)}>Cancel</Button>
          <Button
            variant="primary"
            onClick={onSave}
            disabled={busy || !valid}
            disabledReason={postboxBusyReason(false, busy) ?? (!valid ? POSTBOX_INTERFACE_I18N.incompleteDraft : undefined)}
          >
            {isRevision ? "Create revision" : "Create draft"}
          </Button>
        </div>
      }
    >
      <div className="postbox-form-grid two-columns">
        <FormField label="Name" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input
            value={draft.name}
            disabled={isRevision}
            onChange={(event) => onChange({ ...draft, name: event.target.value })}
          />
        </FormField>
        <FormField label="Slug" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input
            value={draft.slug}
            disabled={isRevision}
            onChange={(event) => onChange({ ...draft, slug: event.target.value })}
          />
        </FormField>
        <FormField label="Description" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input
            value={draft.description || ""}
            disabled={isRevision}
            onChange={(event) => onChange({ ...draft, description: event.target.value })}
          />
        </FormField>
        <FormField label="Function type" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <select
            value={draft.function_type_id || ""}
            onChange={(event) => onChange({
              ...draft,
              function_type_id: event.target.value || null
            })}
          >
            <option value="">Any function type</option>
            {functionTypes.map((item) => (
              <option key={item.id} value={item.id}>{item.name} · {item.id}</option>
            ))}
          </select>
        </FormField>
        <FormField label="Scope" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <select
            value={draft.scope_kind}
            onChange={(event) => {
              const scope_kind = event.target.value as TemplateDraft["scope_kind"];
              onChange({
                ...draft,
                scope_kind,
                scope_id: scope_kind === "tenant" ? null : "",
                scope_structure_id: null,
                scope_relation_type_ids: []
              });
            }}
          >
            <option value="tenant">Tenant</option>
            <option value="unit">One unit</option>
            <option value="subtree">Unit subtree</option>
            <option value="unit_type">Unit type</option>
          </select>
        </FormField>
        {draft.scope_kind !== "tenant" ? (
          <FormField label="Scope target" documentation={POSTBOX_FIELD_DOCUMENTATION}>
            <select
              value={draft.scope_id || ""}
              onChange={(event) => onChange({ ...draft, scope_id: event.target.value || null })}
            >
              <option value="">Select target</option>
              {scopeOptions.map((item) => (
                <option key={item.id} value={item.id}>{item.label}</option>
              ))}
            </select>
          </FormField>
        ) : <div />}
        {draft.scope_kind === "subtree" ? (
          <>
            <FormField label="Hierarchy structure" documentation={POSTBOX_FIELD_DOCUMENTATION}>
              <select
                value={draft.scope_structure_id || ""}
                onChange={(event) => onChange({
                  ...draft,
                  scope_structure_id: event.target.value || null,
                  scope_relation_type_ids: []
                })}
              >
                <option value="">Select structure</option>
                {structures.filter((item) => item.status === "active").map((item) => (
                  <option key={item.id} value={item.id}>{item.name}</option>
                ))}
              </select>
            </FormField>
            <FormField label="Hierarchy relation types" documentation={POSTBOX_FIELD_DOCUMENTATION}>
              <div className="postbox-relation-options">
                {(selectedScopeStructure?.relation_types || [])
                  .filter((item) => item.status === "active" && item.is_hierarchical)
                  .map((item) => (
                    <label key={item.id}>
                      <input
                        type="checkbox"
                        checked={draft.scope_relation_type_ids.includes(item.id)}
                        onChange={(event) => onChange({
                          ...draft,
                          scope_relation_type_ids: event.target.checked
                            ? [...draft.scope_relation_type_ids, item.id]
                            : draft.scope_relation_type_ids.filter((id) => id !== item.id)
                        })}
                      />
                      <span>{item.name}</span>
                    </label>
                  ))}
                {selectedScopeStructure && !selectedScopeStructure.relation_types.some(
                  (item) => item.status === "active" && item.is_hierarchical
                ) ? <span className="postbox-note">No active hierarchical relation type.</span> : null}
                {!selectedScopeStructure ? <span className="postbox-note">All active hierarchical relations are used unless specific types are selected.</span> : null}
              </div>
            </FormField>
          </>
        ) : null}
        <FormField label="Name pattern" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input
            value={draft.name_pattern}
            onChange={(event) => onChange({ ...draft, name_pattern: event.target.value })}
          />
        </FormField>
        <FormField label="Address pattern" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input
            value={draft.address_pattern}
            onChange={(event) => onChange({ ...draft, address_pattern: event.target.value })}
          />
        </FormField>
        <FormField label="Classification" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input
            value={draft.classification}
            onChange={(event) => onChange({ ...draft, classification: event.target.value })}
          />
        </FormField>
        <div className="postbox-toggle-field">
          <ToggleSwitch
            label="Accept delivery while vacant"
            help="Messages remain institutionally retained even when no incumbent currently has access."
            checked={draft.allow_vacant_delivery}
            onChange={(checked) => onChange({ ...draft, allow_vacant_delivery: checked })}
          />
        </div>
        <div className="postbox-toggle-field">
          <ToggleSwitch
            label="Show in Portal"
            help="Portal lists this Postbox only for users whose current function assignment already grants Postbox access."
            checked={draft.portal_visible}
            onChange={(checked) => onChange({ ...draft, portal_visible: checked })}
          />
        </div>
        <div className="postbox-routing-section">
          <div className="postbox-routing-heading">
            <div>
              <strong>Hierarchy linked copies</strong>
              <span>Copy to explicitly bounded function Postboxes in one selected structure.</span>
              <DocumentationHelpLink reference={POSTBOX_FIELD_DOCUMENTATION} />
            </div>
            <ToggleSwitch
              label="Enable hierarchy linked copies"
              help="Copies create independent deliveries and evidence at explicitly bounded hierarchy targets."
              checked={linkedCopy.enabled}
              onChange={(enabled) => updateLinkedCopy({
                enabled,
                allowed_classifications: linkedCopy.allowed_classifications.length
                  ? linkedCopy.allowed_classifications
                  : [draft.classification]
              })}
            />
          </div>
          {linkedCopy.enabled ? (
            <div className="postbox-form-grid two-columns">
              <FormField label="Organization structure" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <select
                  value={linkedCopy.structure_id || ""}
                  onChange={(event) => updateLinkedCopy({
                    structure_id: event.target.value || null,
                    relation_type_ids: []
                  })}
                >
                  <option value="">Select structure</option>
                  {structures.filter((item) => item.status === "active").map((item) => (
                    <option key={item.id} value={item.id}>{item.name}</option>
                  ))}
                </select>
              </FormField>
              <FormField label="Relation type" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <select
                  value={linkedCopy.relation_type_ids[0] || ""}
                  onChange={(event) => updateLinkedCopy({
                    relation_type_ids: event.target.value ? [event.target.value] : []
                  })}
                >
                  <option value="">All hierarchical relations</option>
                  {(selectedStructure?.relation_types || [])
                    .filter((item) => item.status === "active" && item.is_hierarchical)
                    .map((item) => (
                      <option key={item.id} value={item.id}>{item.name}</option>
                    ))}
                </select>
              </FormField>
              <FormField label="Target function type" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <select
                  value={linkedCopy.target_function_type_id || ""}
                  onChange={(event) => updateLinkedCopy({
                    target_function_type_id: event.target.value || null
                  })}
                >
                  <option value="">Select function type</option>
                  {functionTypes.map((item) => (
                    <option key={item.id} value={item.id}>{item.name}</option>
                  ))}
                </select>
              </FormField>
              <FormField label="Target Postbox template" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <select
                  value={linkedCopy.target_template_id || ""}
                  onChange={(event) => updateLinkedCopy({
                    target_template_id: event.target.value || null
                  })}
                >
                  <option value="">Select published template</option>
                  {templates
                    .filter((item) => item.status === "published")
                    .map((item) => (
                      <option key={item.id} value={item.id}>{item.name}</option>
                    ))}
                </select>
              </FormField>
              <FormField label="Maximum hierarchy depth" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <input
                  type="number"
                  min={1}
                  max={20}
                  value={linkedCopy.max_depth}
                  onChange={(event) => updateLinkedCopy({
                    max_depth: Math.max(1, Math.min(20, Number(event.target.value) || 1))
                  })}
                />
              </FormField>
              <FormField label="Copy behavior" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <select
                  value={linkedCopy.fanout}
                  onChange={(event) => {
                    const fanout = event.target.value as "nearest" | "all";
                    updateRouting({
                      ...draft.routing_policy,
                      linked_copy: { ...linkedCopy, fanout },
                      attention: fanout === "all"
                        ? { mode: "none", delay_minutes: null }
                        : attention
                    });
                  }}
                >
                  <option value="nearest">Nearest matching ancestor</option>
                  <option value="all">All matching ancestors</option>
                </select>
              </FormField>
              <FormField label="Optional stop unit" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <select
                  value={linkedCopy.stop_unit_id || ""}
                  onChange={(event) => updateLinkedCopy({
                    stop_unit_id: event.target.value || null
                  })}
                >
                  <option value="">No unit stop</option>
                  {units.map((item) => (
                    <option key={item.id} value={item.id}>{item.name}</option>
                  ))}
                </select>
              </FormField>
              <FormField label="Optional stop unit type" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <select
                  value={linkedCopy.stop_unit_type_id || ""}
                  onChange={(event) => updateLinkedCopy({
                    stop_unit_type_id: event.target.value || null
                  })}
                >
                  <option value="">No unit-type stop</option>
                  {unitTypes.map((item) => (
                    <option key={item.id} value={item.id}>{item.id}</option>
                  ))}
                </select>
              </FormField>
              <FormField label="Allowed classifications" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <input
                  value={linkedCopy.allowed_classifications.join(", ")}
                  onChange={(event) => updateLinkedCopy({
                    allowed_classifications: commaSeparated(event.target.value)
                  })}
                />
              </FormField>
              <FormField label="Authorized producer modules" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <input
                  placeholder="campaigns, workflow"
                  value={linkedCopy.allowed_producer_modules.join(", ")}
                  onChange={(event) => updateLinkedCopy({
                    allowed_producer_modules: commaSeparated(event.target.value)
                  })}
                />
              </FormField>
              <div className="postbox-toggle-field">
                <ToggleSwitch
                  label="Require message expiry"
                  help="Reject copied deliveries that do not carry an explicit expiry boundary."
                  checked={linkedCopy.require_expiry}
                  onChange={(require_expiry) => updateLinkedCopy({ require_expiry })}
                />
              </div>
              <FormField label="Maximum retention days" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                <input
                  type="number"
                  min={1}
                  max={36500}
                  value={linkedCopy.max_retention_days ?? ""}
                  onChange={(event) => updateLinkedCopy({
                    max_retention_days: event.target.value
                      ? Math.max(1, Math.min(36500, Number(event.target.value)))
                      : null
                  })}
                />
              </FormField>
              <div className="postbox-toggle-field">
                <ToggleSwitch
                  label="Escalate when the nearest target remains vacant"
                  help="Schedules a separate, auditable delivery only after the configured vacancy delay."
                  checked={attention.mode === "vacancy_escalation"}
                  onChange={(checked) => updateRouting({
                    ...draft.routing_policy,
                    attention: checked
                      ? {
                          mode: "vacancy_escalation",
                          delay_minutes: attention.delay_minutes || 1440
                        }
                      : { mode: "none", delay_minutes: null }
                  })}
                />
              </div>
              {attention.mode === "vacancy_escalation" ? (
                <FormField label="Vacancy escalation delay (minutes)" documentation={POSTBOX_FIELD_DOCUMENTATION}>
                  <input
                    type="number"
                    min={1}
                    max={43200}
                    value={attention.delay_minutes ?? 1440}
                    onChange={(event) => updateRouting({
                      ...draft.routing_policy,
                      attention: {
                        mode: "vacancy_escalation",
                        delay_minutes: Math.max(
                          1,
                          Math.min(43200, Number(event.target.value) || 1)
                        )
                      }
                    })}
                  />
                </FormField>
              ) : <div />}
            </div>
          ) : null}
        </div>
      </div>
      {preview ? <TemplateImpactPreview preview={preview} /> : null}
      <p className="postbox-form-note">
        Available pattern variables include template, unit, function, and optional context names or slugs. Published revisions are immutable.
      </p>
    </Dialog>
  );
}

function TemplateImpactPreview({
  preview
}: {
  preview: PostboxTemplatePreview;
}) {
  return (
    <section className="postbox-template-preview" aria-label="Template impact preview">
      <div className="postbox-routing-heading">
        <div>
          <strong>Dry-run impact</strong>
          <span>No Postboxes or addresses were created.</span>
        </div>
        {preview.truncated ? <StatusBadge status="warning" label="List truncated" /> : null}
      </div>
      <div className="metric-grid compact postbox-preview-metrics">
        <MetricCard label="Targets" value={preview.total} tone="info" />
        <MetricCard label="Ready" value={preview.ready_count} tone="good" />
        <MetricCard label="Existing" value={preview.existing_count} />
        <MetricCard label="Vacant" value={preview.vacant_count} tone="warning" />
        <MetricCard label="Blocked" value={preview.blocked_count} tone="danger" />
      </div>
      {preview.diagnostics.length ? (
        <p className="postbox-form-note">{preview.diagnostics.join(", ")}</p>
      ) : null}
      <div className="postbox-preview-targets">
        {preview.targets.map((target) => (
          <div key={`${target.organization_unit_id}:${target.function_id}`}>
            <div>
              <strong>{target.name}</strong>
              <span>{target.organization_unit_name} · {target.function_name}</span>
              <code>{target.address}</code>
              {target.diagnostics.length ? (
                <small>{target.diagnostics.join(", ")}</small>
              ) : null}
            </div>
            <div className="postbox-preview-status">
              <StatusBadge status={target.status} label={target.status.replaceAll("_", " ")} />
              <span>{target.holder_count} holder{target.holder_count === 1 ? "" : "s"}</span>
            </div>
          </div>
        ))}
        {!preview.targets.length ? (
          <p className="postbox-note">The scope contains no matching active function.</p>
        ) : null}
      </div>
    </section>
  );
}

function ExactPostboxDialog({
  open,
  draft,
  units,
  busy,
  onChange,
  onClose,
  onSave
}: {
  open: boolean;
  draft: ExactDraft;
  units: PostboxOrganizationUnit[];
  busy: boolean;
  onChange: (draft: ExactDraft) => void;
  onClose: () => void;
  onSave: () => void;
}) {
  const unit = units.find((item) => item.id === draft.organization_unit_id);
  return (
    <Dialog
      open={open}
      title="New exact Postbox"
      className="postbox-dialog"
      onClose={onClose}
      closeDisabled={busy}
      footer={
        <div className="button-row compact-actions">
          <Button onClick={onClose} disabled={busy} disabledReason={postboxBusyReason(false, busy)}>Cancel</Button>
          <Button
            variant="primary"
            onClick={onSave}
            disabled={busy || !draft.name.trim() || !draft.organization_unit_id || !draft.function_id}
            disabledReason={postboxBusyReason(false, busy) ?? ((!draft.name.trim() || !draft.organization_unit_id || !draft.function_id) ? POSTBOX_INTERFACE_I18N.incompleteDraft : undefined)}
          >
            Create Postbox
          </Button>
        </div>
      }
    >
      <div className="postbox-form-grid two-columns">
        <FormField label="Name" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input value={draft.name} onChange={(event) => onChange({ ...draft, name: event.target.value })} />
        </FormField>
        <FormField label="Address key" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input value={draft.address_key || ""} placeholder="Generated when empty" onChange={(event) => onChange({ ...draft, address_key: event.target.value })} />
        </FormField>
        <FormField label="Organization unit" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <select
            value={draft.organization_unit_id}
            onChange={(event) => {
              const nextUnit = units.find((item) => item.id === event.target.value);
              onChange({
                ...draft,
                organization_unit_id: event.target.value,
                function_id: nextUnit?.functions[0]?.id ?? ""
              });
            }}
          >
            <option value="">Select unit</option>
            {units.filter((item) => item.functions.length).map((item) => (
              <option key={item.id} value={item.id}>{item.name}</option>
            ))}
          </select>
        </FormField>
        <FormField label="Function" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <select value={draft.function_id} onChange={(event) => onChange({ ...draft, function_id: event.target.value })}>
            <option value="">Select function</option>
            {(unit?.functions || []).map((fn) => (
              <option key={fn.id} value={fn.id}>{fn.name}</option>
            ))}
          </select>
        </FormField>
        <FormField label="Classification" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input value={draft.classification} onChange={(event) => onChange({ ...draft, classification: event.target.value })} />
        </FormField>
        <FormField label="Description" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input value={draft.description || ""} onChange={(event) => onChange({ ...draft, description: event.target.value })} />
        </FormField>
        <div className="postbox-toggle-field">
          <ToggleSwitch
            label="Show in Portal"
            help="Portal lists this Postbox only when the current user's function assignment grants access."
            checked={draft.portal_visible}
            onChange={(checked) => onChange({ ...draft, portal_visible: checked })}
          />
        </div>
      </div>
    </Dialog>
  );
}

function MaterializeDialog({
  open,
  draft,
  template,
  units,
  busy,
  onChange,
  onClose,
  onSave
}: {
  open: boolean;
  draft: MaterializeDraft;
  template: PostboxTemplate | null;
  units: PostboxOrganizationUnit[];
  busy: boolean;
  onChange: (draft: MaterializeDraft) => void;
  onClose: () => void;
  onSave: () => void;
}) {
  const revision = template ? currentRevision(template) : null;
  const compatible = compatibleTargets(units, revision?.function_type_id);
  const unit = compatible.find((item) => item.id === draft.organization_unit_id);
  return (
    <Dialog
      open={open}
      title={template
        ? i18nMessage("i18n:govoplan-postbox.resolve_address_title", { name: template.name })
        : "Resolve address"}
      className="postbox-dialog"
      onClose={onClose}
      closeDisabled={busy}
      footer={
        <div className="button-row compact-actions">
          <Button onClick={onClose} disabled={busy} disabledReason={postboxBusyReason(false, busy)}>Cancel</Button>
          <Button
            variant="primary"
            onClick={onSave}
            disabled={busy || !draft.organization_unit_id || !draft.function_id}
            disabledReason={postboxBusyReason(false, busy) ?? ((!draft.organization_unit_id || !draft.function_id) ? POSTBOX_INTERFACE_I18N.incompleteDraft : undefined)}
          >
            Resolve address
          </Button>
        </div>
      }
    >
      <div className="postbox-form-grid">
        <FormField label="Organization unit" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <select
            value={draft.organization_unit_id}
            onChange={(event) => {
              const nextUnit = compatible.find((item) => item.id === event.target.value);
              onChange({
                ...draft,
                organization_unit_id: event.target.value,
                function_id: nextUnit?.functions[0]?.id ?? ""
              });
            }}
          >
            <option value="">Select unit</option>
            {compatible.map((item) => (
              <option key={item.id} value={item.id}>{item.name}</option>
            ))}
          </select>
        </FormField>
        <FormField label="Function" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <select value={draft.function_id} onChange={(event) => onChange({ ...draft, function_id: event.target.value })}>
            <option value="">Select function</option>
            {(unit?.functions || []).map((fn) => (
              <option key={fn.id} value={fn.id}>{fn.name}</option>
            ))}
          </select>
        </FormField>
        <FormField label="Optional case or service context" documentation={POSTBOX_FIELD_DOCUMENTATION}>
          <input value={draft.context_key} onChange={(event) => onChange({ ...draft, context_key: event.target.value })} />
        </FormField>
      </div>
    </Dialog>
  );
}

function currentRevision(template: PostboxTemplate) {
  return template.revisions.find((revision) => revision.revision === template.current_revision)
    ?? template.revisions.at(-1)
    ?? null;
}

function revisionPayload(draft: TemplateDraft): PostboxTemplateRevisionPayload {
  return {
    function_type_id: draft.function_type_id || null,
    scope_kind: draft.scope_kind,
    scope_id: draft.scope_kind === "tenant" ? null : draft.scope_id || null,
    scope_structure_id: draft.scope_kind === "subtree"
      ? draft.scope_structure_id || null
      : null,
    scope_relation_type_ids: draft.scope_kind === "subtree"
      ? draft.scope_relation_type_ids
      : [],
    name_pattern: draft.name_pattern,
    address_pattern: draft.address_pattern,
    classification: draft.classification,
    allow_vacant_delivery: draft.allow_vacant_delivery,
    portal_visible: draft.portal_visible,
    routing_policy: draft.routing_policy
  };
}

function compatibleTargets(
  units: PostboxOrganizationUnit[],
  functionTypeId?: string | null
): PostboxOrganizationUnit[] {
  return units
    .map((unit) => ({
      ...unit,
      functions: functionTypeId
        ? unit.functions.filter((fn) => fn.function_type_id === functionTypeId)
        : unit.functions
    }))
    .filter((unit) => unit.functions.length);
}

function errorMessage(error: unknown): string {
  return error instanceof Error ? error.message : "Postbox request failed";
}

function commaSeparated(value: string): string[] {
  return [...new Set(value.split(",").map((item) => item.trim()).filter(Boolean))];
}

function draftKey(value: unknown): string {
  return JSON.stringify(value);
}