import { useEffect, useState } from "react";
import {
  AdminPageLayout,
  Button,
  Card,
  FormField,
  ToggleSwitch,
  adminErrorMessage,
  hasAnyScope,
  useUnsavedDraftGuard,
  type ApiSettings,
  type AuthInfo
} from "@govoplan/core-webui";
import {
  getOrganizationSettings,
  patchOrganizationSettings,
  type OrganizationAuditDetailLevel,
  type OrganizationSettingsItem
} from "../../api/organizations";

const FALLBACK_SETTINGS: OrganizationSettingsItem = {
  tenant_id: "",
  allow_tenant_model_customization: true,
  require_model_change_requests: false,
  audit_detail_level: "standard",
  change_retention_days: null,
  settings: {}
};

const AUDIT_DETAIL_LEVELS: Array<{ value: OrganizationAuditDetailLevel; label: string }> = [
  { value: "summary", label: "i18n:govoplan-organizations.audit_summary.6a7d68a5" },
  { value: "standard", label: "i18n:govoplan-organizations.audit_standard.785d981f" },
  { value: "full", label: "i18n:govoplan-organizations.audit_full.0c83669c" }
];

export default function OrganizationsAdminPanel({ settings, auth }: { settings: ApiSettings; auth: AuthInfo }) {
  const [draft, setDraft] = useState<OrganizationSettingsItem>(FALLBACK_SETTINGS);
  const [savedDraft, setSavedDraft] = useState<OrganizationSettingsItem>(FALLBACK_SETTINGS);
  const [loading, setLoading] = useState(true);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState("");
  const [success, setSuccess] = useState("");
  const canWrite = hasAnyScope(auth, ["organizations:settings:write", "admin:settings:write"]);
  const dirty = settingsKey(draft) !== settingsKey(savedDraft);

  useUnsavedDraftGuard({
    dirty,
    onSave: save,
    onDiscard: () => setDraft(savedDraft)
  });

  useEffect(() => {
    void load();
  }, [settings.accessToken, settings.apiBaseUrl]);

  async function load() {
    setLoading(true);
    setError("");
    try {
      const next = await getOrganizationSettings(settings);
      setDraft(next);
      setSavedDraft(next);
    } catch (caught) {
      setError(adminErrorMessage(caught));
    } finally {
      setLoading(false);
    }
  }

  async function save(): Promise<boolean> {
    setBusy(true);
    setError("");
    setSuccess("");
    try {
      const saved = await patchOrganizationSettings(settings, {
        allow_tenant_model_customization: draft.allow_tenant_model_customization,
        require_model_change_requests: draft.require_model_change_requests,
        audit_detail_level: draft.audit_detail_level,
        change_retention_days: draft.change_retention_days ?? null,
        settings: draft.settings
      });
      setDraft(saved);
      setSavedDraft(saved);
      setSuccess("i18n:govoplan-organizations.organization_settings_saved.bfbcfdfa");
      return true;
    } catch (caught) {
      setError(adminErrorMessage(caught));
      return false;
    } finally {
      setBusy(false);
    }
  }

  return (
    <AdminPageLayout
      title="i18n:govoplan-organizations.organization_settings.c9ab9829"
      description="i18n:govoplan-organizations.organization_settings_description.35dc9f10"
      loading={loading}
      loadingLabel="i18n:govoplan-organizations.loading_organization_settings.c6008db8"
      error={error}
      success={success}
      actions={<><Button onClick={() => void load()} disabled={loading || busy}>i18n:govoplan-organizations.reload.cce71553</Button><Button variant="primary" onClick={() => void save()} disabled={!canWrite || busy || !dirty}>{busy ? "i18n:govoplan-organizations.saving.56a2285c" : "i18n:govoplan-organizations.save_settings.913aba9f"}</Button></>}
    >
      <div className="organizations-settings-grid">
        <Card title="i18n:govoplan-organizations.model_governance.6aa18fd0">
          <div className="settings-list">
            <ToggleSwitch
              checked={draft.allow_tenant_model_customization}
              disabled={!canWrite || busy}
              onChange={(checked) => setDraft({ ...draft, allow_tenant_model_customization: checked })}
              label="i18n:govoplan-organizations.allow_tenant_model_customization.2425d751"
            />
            <ToggleSwitch
              checked={draft.require_model_change_requests}
              disabled={!canWrite || busy}
              onChange={(checked) => setDraft({ ...draft, require_model_change_requests: checked })}
              label="i18n:govoplan-organizations.require_model_change_requests.83454cad"
            />
          </div>
          <p className="muted small-note">i18n:govoplan-organizations.model_governance_help.0fa69021</p>
        </Card>

        <Card title="i18n:govoplan-organizations.audit_and_retention.3ba1d2fc">
          <div className="admin-form-grid two-columns">
            <FormField label="i18n:govoplan-organizations.audit_detail_level.7397355d">
              <select value={draft.audit_detail_level} disabled={!canWrite || busy} onChange={(event) => setDraft({ ...draft, audit_detail_level: event.target.value as OrganizationAuditDetailLevel })}>
                {AUDIT_DETAIL_LEVELS.map((item) => <option key={item.value} value={item.value}>{item.label}</option>)}
              </select>
            </FormField>
            <FormField label="i18n:govoplan-organizations.change_retention_days.71bbd140">
              <input
                type="number"
                min={0}
                value={draft.change_retention_days ?? ""}
                disabled={!canWrite || busy}
                placeholder="i18n:govoplan-organizations.unlimited.35569464"
                onChange={(event) => setDraft({ ...draft, change_retention_days: event.target.value === "" ? null : Math.max(0, Number(event.target.value)) })}
              />
            </FormField>
          </div>
          <p className="muted small-note">i18n:govoplan-organizations.audit_retention_help.42dec57d</p>
        </Card>
      </div>
    </AdminPageLayout>
  );
}

function settingsKey(settings: OrganizationSettingsItem): string {
  return JSON.stringify({
    allow_tenant_model_customization: settings.allow_tenant_model_customization,
    require_model_change_requests: settings.require_model_change_requests,
    audit_detail_level: settings.audit_detail_level,
    change_retention_days: settings.change_retention_days ?? null,
    settings: settings.settings
  });
}