import {
  apiFetch,
  apiPath,
  apiPostJson,
  apiUrl,
  authHeaders,
  type ApiSettings
} from "@govoplan/core-webui";

export type PostboxAccessDecision = {
  allowed: boolean;
  action: string;
  postbox_id: string;
  reason_code: string;
  explanation: string;
  organization_unit_id?: string | null;
  function_id?: string | null;
  assignment_ids: string[];
  assignment_sources: string[];
  selected_assignment_id?: string | null;
  holder_count: number;
  vacant: boolean;
  classification: string;
  classification_allowed: boolean;
  binding_status: string;
};

export type PostboxDirectoryItem = {
  id: string;
  tenant_id: string;
  address: string;
  address_key: string;
  name: string;
  status: string;
  classification: string;
  organization_unit_id?: string | null;
  organization_unit_name?: string | null;
  function_id?: string | null;
  function_name?: string | null;
  context_key?: string | null;
  template_revision_id?: string | null;
  holder_count: number;
  vacant: boolean;
  encryption_profile: PostboxProtectionProfileId;
  key_epoch: number;
  encryption_vault_id?: string | null;
  protection_policy: PostboxProtectionPolicy;
  grouping_policy: PostboxGroupingPolicy;
  access?: PostboxAccessDecision | null;
  resource_revision: number;
  etag: string;
};

export type PostboxProtectionProfileId =
  | "plaintext_v1"
  | "server_envelope_v1"
  | "external_e2ee_v1";

export type PostboxProtectionPolicy = {
  new_incumbent_history: "all_retained" | "since_assignment" | "bounded_days";
  history_days?: number | null;
  ordinary_rotation: "rewrap" | "reencrypt";
  compromise_rotation: "rewrap" | "reencrypt";
  recovery_authority: "disabled" | "user_consent" | "institutional_key_holders" | "dual_control";
  recovery_quorum: number;
  handover_authority: "user_consent" | "institutional_key_holders" | "dual_control";
  handover_quorum: number;
  emergency_access: "disabled" | "dual_control";
  emergency_quorum: number;
  export_authority: "user_consent" | "institutional_key_holders" | "dual_control";
  export_quorum: number;
  destruction_authority: "institutional_key_holders" | "dual_control";
  destruction_quorum: number;
  external_recipient_assurance: "disabled" | "email_otp" | "strong_identity";
  vacancy_escalation_content_access: "metadata_only";
};

export type PostboxGroupingPolicy = {
  mode: "allow" | "same_classification" | "separate";
  reason?: string | null;
};

export type PostboxProtectionProfile = {
  id: PostboxProtectionProfileId;
  label: string;
  description: string;
  server_can_decrypt: boolean;
  requires_encryption_module: boolean;
  requires_external_client: boolean;
  available: boolean;
  standard: boolean;
};

export type PostboxProtectionTransition = {
  id: string;
  postbox_id: string;
  source_profile: string;
  target_profile: string;
  source_vault_id?: string | null;
  target_vault_id?: string | null;
  history_mode: string;
  authority_mode: string;
  required_quorum: number;
  evidence_refs: string[];
  reason: string;
  state: string;
  message_count: number;
  completed_count: number;
  failed_count: number;
  requested_by?: string | null;
  activated_at?: string | null;
  completed_at?: string | null;
  resource_revision: number;
  etag: string;
  configuration_snapshot: Record<string, unknown>;
  items: Array<{
    id: string;
    message_id: string;
    source_profile: string;
    target_profile: string;
    state: string;
    source_digest?: string | null;
    target_digest?: string | null;
    error_code?: string | null;
  }>;
};

export type PostboxParticipant = {
  kind: string;
  reference_type: string;
  reference_id?: string | null;
  label?: string | null;
  address?: string | null;
};

export type PostboxAttachment = {
  reference_type: string;
  reference_id: string;
  name?: string | null;
  media_type?: string | null;
  size_bytes?: number | null;
  digest?: string | null;
  metadata: Record<string, unknown>;
};

export type PostboxAttachmentResolution = PostboxAttachment & {
  available: boolean;
  reason_code: string;
  file_asset_id?: string | null;
  file_version_id?: string | null;
  download_path?: string | null;
  provenance: Record<string, unknown>;
};

export type PostboxMessage = {
  id: string;
  tenant_id: string;
  postbox_id: string;
  subject: string;
  body_text?: string | null;
  status: string;
  availability: "available" | "withdrawn" | "expired";
  classification: string;
  sender_label?: string | null;
  delivered_at: string;
  read_at?: string | null;
  acknowledged_at?: string | null;
  expires_at?: string | null;
  withdrawn_at?: string | null;
  producer_module?: string | null;
  producer_resource_type?: string | null;
  producer_resource_id?: string | null;
  in_reply_to_message_id?: string | null;
  replaces_message_id?: string | null;
  encryption_profile: PostboxProtectionProfileId;
  key_epoch: number;
  ciphertext_ref?: string | null;
  signed_manifest_ref?: string | null;
  wrapped_keys: Array<{
    recipient_type: string;
    recipient_id: string;
    key_epoch: number;
    wrapped_key_ref: string;
    algorithm?: string | null;
    metadata: Record<string, unknown>;
  }>;
  external_recipient_tokens: Array<{
    token_id: string;
    state: "pending" | "available" | "fetched" | "expired" | "revoked";
    expires_at?: string | null;
    one_time: boolean;
    key_fetched_at?: string | null;
    revoked_at?: string | null;
    assurance_profile?: string | null;
    metadata: Record<string, unknown>;
  }>;
  participants: PostboxParticipant[];
  attachments: PostboxAttachment[];
  metadata: Record<string, unknown>;
};

export type PostboxGrouping = {
  id: string;
  name: string;
  is_default: boolean;
  postbox_ids: string[];
  total_count: number;
  unread_count: number;
  constraints: Array<{
    code: "source_requires_separation" | "classification_separation_required";
    mode: PostboxGroupingPolicy["mode"];
    postbox_id: string;
    reason?: string | null;
    enforced_by: "postbox_configuration";
  }>;
  resource_revision: number;
  etag: string;
  created_at: string;
  updated_at: string;
};

export type PostboxOrganizationFunction = {
  id: string;
  slug: string;
  name: string;
  function_type_id?: string | null;
  delegable: boolean;
  act_in_place_allowed: boolean;
};

export type PostboxOrganizationUnit = {
  id: string;
  slug: string;
  name: string;
  unit_type_id?: string | null;
  parent_id?: string | null;
  functions: PostboxOrganizationFunction[];
};

export type PostboxOrganizationRelationType = {
  id: string;
  slug: string;
  name: string;
  structure_id?: string | null;
  is_hierarchical: boolean;
  status: string;
};

export type PostboxOrganizationStructure = {
  id: string;
  slug: string;
  name: string;
  structure_kind: string;
  status: string;
  relation_types: PostboxOrganizationRelationType[];
};

export type PostboxOrganizationTargets = {
  units: PostboxOrganizationUnit[];
  structures: PostboxOrganizationStructure[];
};

export type PostboxRoutingPolicy = {
  linked_copy: {
    enabled: boolean;
    structure_id?: string | null;
    relation_type_ids: string[];
    max_depth: number;
    stop_unit_id?: string | null;
    stop_unit_type_id?: string | null;
    target_function_type_id?: string | null;
    target_template_id?: string | null;
    fanout: "nearest" | "all";
    allowed_classifications: string[];
    allowed_producer_modules: string[];
    require_expiry: boolean;
    max_retention_days?: number | null;
  };
  attention: {
    mode: "none" | "vacancy_escalation";
    delay_minutes?: number | null;
  };
  shared_visibility: {
    mode: "none";
  };
};

export type PostboxTemplateRevision = {
  id: string;
  revision: number;
  function_type_id?: string | null;
  scope_kind: "tenant" | "unit" | "subtree" | "unit_type";
  scope_id?: string | null;
  scope_structure_id?: string | null;
  scope_relation_type_ids: string[];
  name_pattern: string;
  address_pattern: string;
  classification: string;
  allow_vacant_delivery: boolean;
  portal_visible: boolean;
  encryption_profile: string;
  encryption_vault_id?: string | null;
  protection_policy: PostboxProtectionPolicy;
  grouping_policy: PostboxGroupingPolicy;
  history_policy: Record<string, unknown>;
  routing_policy: PostboxRoutingPolicy;
  retention_policy: Record<string, unknown>;
  published_at?: string | null;
  created_at: string;
};

export type PostboxTemplate = {
  id: string;
  tenant_id: string;
  slug: string;
  name: string;
  description?: string | null;
  status: string;
  current_revision: number;
  resource_revision: number;
  etag: string;
  published_revision_id?: string | null;
  revisions: PostboxTemplateRevision[];
  created_at: string;
  updated_at: string;
};

export type PostboxTemplateRevisionPayload = Pick<
  PostboxTemplateRevision,
  | "function_type_id"
  | "scope_kind"
  | "scope_id"
  | "scope_structure_id"
  | "scope_relation_type_ids"
  | "name_pattern"
  | "address_pattern"
  | "classification"
  | "allow_vacant_delivery"
  | "portal_visible"
  | "encryption_profile"
  | "encryption_vault_id"
  | "protection_policy"
  | "grouping_policy"
  | "routing_policy"
>;

export type PostboxTemplateCreatePayload = PostboxTemplateRevisionPayload & {
  slug: string;
  name: string;
  description?: string | null;
};

export type PostboxTemplatePreviewTarget = {
  organization_unit_id: string;
  organization_unit_name: string;
  function_id: string;
  function_name: string;
  address: string;
  name: string;
  holder_count: number;
  vacant: boolean;
  status: string;
  existing_postbox_id?: string | null;
  diagnostics: string[];
};

export type PostboxTemplatePreview = {
  targets: PostboxTemplatePreviewTarget[];
  total: number;
  ready_count: number;
  existing_count: number;
  vacant_count: number;
  blocked_count: number;
  truncated: boolean;
  diagnostics: string[];
};

export type PostboxExactCreatePayload = {
  name: string;
  description?: string | null;
  organization_unit_id: string;
  function_id: string;
  address_key?: string | null;
  classification: string;
  portal_visible: boolean;
  encryption_profile: PostboxProtectionProfileId;
  encryption_vault_id?: string | null;
  protection_policy: PostboxProtectionPolicy;
  grouping_policy: PostboxGroupingPolicy;
};

export type PostboxMessageAuthoringPayload = {
  idempotency_key: string;
  subject: string;
  body_text?: string | null;
  ciphertext_ref?: string | null;
  signed_manifest_ref?: string | null;
  wrapped_keys?: PostboxMessage["wrapped_keys"];
  classification: string;
  participants: PostboxParticipant[];
  attachments: PostboxAttachment[];
  metadata: Record<string, unknown>;
};

type PostboxGroupingPayload = Pick<
  PostboxGrouping,
  "name" | "is_default" | "postbox_ids"
>;

export async function listPostboxes(settings: ApiSettings): Promise<PostboxDirectoryItem[]> {
  const response = await apiFetch<{ postboxes: PostboxDirectoryItem[] }>(
    settings,
    "/api/v1/postbox/directory"
  );
  return response.postboxes;
}

export async function listPostboxMessages(
  settings: ApiSettings,
  postboxIds: string[],
  limit = 100,
  offset = 0,
  query = "",
  state: "all" | "unread" | "read" | "acknowledged" = "all"
): Promise<{ messages: PostboxMessage[]; total: number; limit: number; offset: number }> {
  return apiFetch(
    settings,
    apiPath("/api/v1/postbox/messages", {
      postbox_id: postboxIds,
      limit,
      offset,
      q: query || undefined,
      state
    })
  );
}

export function getPostboxMessage(
  settings: ApiSettings,
  messageId: string
): Promise<PostboxMessage> {
  return apiFetch(settings, `/api/v1/postbox/messages/${encodeURIComponent(messageId)}`);
}

export async function resolvePostboxAttachments(
  settings: ApiSettings,
  messageId: string
): Promise<PostboxAttachmentResolution[]> {
  const response = await apiFetch<{ attachments: PostboxAttachmentResolution[] }>(
    settings,
    `/api/v1/postbox/messages/${encodeURIComponent(messageId)}/attachment-resolutions`
  );
  return response.attachments;
}

export async function downloadPostboxAttachment(
  settings: ApiSettings,
  attachment: PostboxAttachmentResolution
): Promise<void> {
  if (!attachment.available || !attachment.download_path) {
    throw new Error("This attachment payload is not available.");
  }
  const response = await fetch(apiUrl(settings, attachment.download_path), {
    headers: authHeaders(settings),
    credentials: "include"
  });
  if (!response.ok) {
    throw new Error(`Attachment download failed (${response.status}).`);
  }
  const objectUrl = URL.createObjectURL(await response.blob());
  const link = document.createElement("a");
  link.href = objectUrl;
  link.download = attachment.name || attachment.reference_id;
  document.body.appendChild(link);
  link.click();
  link.remove();
  URL.revokeObjectURL(objectUrl);
}

export function markPostboxMessage(
  settings: ApiSettings,
  messageId: string,
  state: "read" | "acknowledged"
): Promise<PostboxMessage> {
  return apiFetch(
    settings,
    `/api/v1/postbox/messages/${encodeURIComponent(messageId)}/state`,
    {
      method: "PATCH",
      body: JSON.stringify({ state })
    }
  );
}

export function createPostboxMessage(
  settings: ApiSettings,
  postboxId: string,
  payload: PostboxMessageAuthoringPayload
): Promise<PostboxMessage> {
  return apiPostJson(settings, "/api/v1/postbox/messages", {
    ...payload,
    postbox_id: postboxId
  });
}

export function replyToPostboxMessage(
  settings: ApiSettings,
  messageId: string,
  payload: PostboxMessageAuthoringPayload
): Promise<PostboxMessage> {
  return apiPostJson(
    settings,
    `/api/v1/postbox/messages/${encodeURIComponent(messageId)}/replies`,
    payload
  );
}

export async function listPostboxGroupings(settings: ApiSettings): Promise<PostboxGrouping[]> {
  const response = await apiFetch<{ groupings: PostboxGrouping[] }>(
    settings,
    "/api/v1/postbox/groupings"
  );
  return response.groupings;
}

export function createPostboxGrouping(
  settings: ApiSettings,
  payload: PostboxGroupingPayload
): Promise<PostboxGrouping> {
  return apiPostJson(settings, "/api/v1/postbox/groupings", payload);
}

export function updatePostboxGrouping(
  settings: ApiSettings,
  grouping: PostboxGrouping,
  payload: PostboxGroupingPayload
): Promise<PostboxGrouping> {
  return apiFetch(
    settings,
    `/api/v1/postbox/groupings/${encodeURIComponent(grouping.id)}`,
    {
      method: "PUT",
      headers: { "If-Match": grouping.etag },
      body: JSON.stringify({ ...payload, base_revision: grouping.resource_revision })
    }
  );
}

export function deletePostboxGrouping(
  settings: ApiSettings,
  grouping: PostboxGrouping
): Promise<void> {
  return apiFetch(
    settings,
    `/api/v1/postbox/groupings/${encodeURIComponent(grouping.id)}`,
    {
      method: "DELETE",
      headers: { "If-Match": grouping.etag },
      body: JSON.stringify({ base_revision: grouping.resource_revision })
    }
  );
}

export async function listAdminPostboxes(settings: ApiSettings): Promise<PostboxDirectoryItem[]> {
  const response = await apiFetch<{ postboxes: PostboxDirectoryItem[] }>(
    settings,
    "/api/v1/postbox/admin/postboxes"
  );
  return response.postboxes;
}

export async function listPostboxProtectionProfiles(
  settings: ApiSettings
): Promise<{ standard_profile: PostboxProtectionProfileId; profiles: PostboxProtectionProfile[] }> {
  return apiFetch(settings, "/api/v1/postbox/admin/protection-profiles");
}

export async function listPostboxProtectionTransitions(
  settings: ApiSettings,
  postboxId: string
): Promise<PostboxProtectionTransition[]> {
  const response = await apiFetch<{ transitions: PostboxProtectionTransition[] }>(
    settings,
    `/api/v1/postbox/admin/postboxes/${encodeURIComponent(postboxId)}/protection-transitions`
  );
  return response.transitions;
}

export function createPostboxProtectionTransition(
  settings: ApiSettings,
  postbox: PostboxDirectoryItem,
  payload: {
    idempotency_key: string;
    target_profile: PostboxProtectionProfileId;
    target_vault_id?: string | null;
    history_mode: "future_only" | "migrate_history";
    authority_mode: "user_consent" | "institutional_key_holders" | "dual_control";
    required_quorum: number;
    user_consent_refs: string[];
    institutional_authorization_refs: string[];
    reason: string;
    acknowledge_irreversibility: boolean;
  }
): Promise<PostboxProtectionTransition> {
  return apiPostJson(
    settings,
    `/api/v1/postbox/admin/postboxes/${encodeURIComponent(postbox.id)}/protection-transitions`,
    { ...payload, base_revision: postbox.resource_revision },
    { headers: { "If-Match": postbox.etag } }
  );
}

export function updatePostboxProtectionPolicy(
  settings: ApiSettings,
  postbox: PostboxDirectoryItem,
  protectionPolicy: PostboxProtectionPolicy
): Promise<PostboxDirectoryItem> {
  return apiFetch(
    settings,
    `/api/v1/postbox/admin/postboxes/${encodeURIComponent(postbox.id)}/protection-policy`,
    {
      method: "PUT",
      headers: { "If-Match": postbox.etag },
      body: JSON.stringify({
        base_revision: postbox.resource_revision,
        protection_policy: protectionPolicy
      })
    }
  );
}

export function updatePostboxGroupingPolicy(
  settings: ApiSettings,
  postbox: PostboxDirectoryItem,
  groupingPolicy: PostboxGroupingPolicy
): Promise<PostboxDirectoryItem> {
  return apiFetch(
    settings,
    `/api/v1/postbox/admin/postboxes/${encodeURIComponent(postbox.id)}/grouping-policy`,
    {
      method: "PUT",
      headers: { "If-Match": postbox.etag },
      body: JSON.stringify({
        base_revision: postbox.resource_revision,
        grouping_policy: groupingPolicy
      })
    }
  );
}

export async function listPostboxOrganizationTargets(
  settings: ApiSettings
): Promise<PostboxOrganizationTargets> {
  return apiFetch<PostboxOrganizationTargets>(
    settings,
    "/api/v1/postbox/admin/organization-targets"
  );
}

export function createExactPostbox(
  settings: ApiSettings,
  payload: PostboxExactCreatePayload
): Promise<PostboxDirectoryItem> {
  return apiPostJson(settings, "/api/v1/postbox/admin/postboxes", payload);
}

export function archivePostbox(
  settings: ApiSettings,
  postbox: PostboxDirectoryItem
): Promise<PostboxDirectoryItem> {
  return apiFetch(
    settings,
    `/api/v1/postbox/admin/postboxes/${encodeURIComponent(postbox.id)}`,
    {
      method: "DELETE",
      headers: { "If-Match": postbox.etag },
      body: JSON.stringify({ base_revision: postbox.resource_revision })
    }
  );
}

export async function listPostboxTemplates(settings: ApiSettings): Promise<PostboxTemplate[]> {
  const response = await apiFetch<{ templates: PostboxTemplate[] }>(
    settings,
    "/api/v1/postbox/admin/templates"
  );
  return response.templates;
}

export function createPostboxTemplate(
  settings: ApiSettings,
  payload: PostboxTemplateCreatePayload
): Promise<PostboxTemplate> {
  return apiPostJson(settings, "/api/v1/postbox/admin/templates", payload);
}

export function previewPostboxTemplate(
  settings: ApiSettings,
  payload: PostboxTemplateCreatePayload & {
    template_id?: string | null;
    context_key?: string | null;
    limit?: number;
  }
): Promise<PostboxTemplatePreview> {
  return apiPostJson(
    settings,
    "/api/v1/postbox/admin/templates/preview",
    payload
  );
}

export function revisePostboxTemplate(
  settings: ApiSettings,
  template: PostboxTemplate,
  payload: PostboxTemplateRevisionPayload
): Promise<PostboxTemplate> {
  return apiPostJson(
    settings,
    `/api/v1/postbox/admin/templates/${encodeURIComponent(template.id)}/revisions`,
    { ...payload, base_revision: template.resource_revision },
    { headers: { "If-Match": template.etag } }
  );
}

export function publishPostboxTemplate(
  settings: ApiSettings,
  template: PostboxTemplate,
  revision?: number
): Promise<PostboxTemplate> {
  return apiPostJson(
    settings,
    `/api/v1/postbox/admin/templates/${encodeURIComponent(template.id)}/publish`,
    { revision: revision ?? null, base_revision: template.resource_revision },
    { headers: { "If-Match": template.etag } }
  );
}

export function retirePostboxTemplate(
  settings: ApiSettings,
  template: PostboxTemplate
): Promise<PostboxTemplate> {
  return apiPostJson(
    settings,
    `/api/v1/postbox/admin/templates/${encodeURIComponent(template.id)}/retire`,
    { base_revision: template.resource_revision },
    { headers: { "If-Match": template.etag } }
  );
}

export function materializePostboxTemplate(
  settings: ApiSettings,
  templateId: string,
  payload: {
    organization_unit_id: string;
    function_id: string;
    context_key?: string | null;
  }
): Promise<PostboxDirectoryItem> {
  return apiPostJson(
    settings,
    `/api/v1/postbox/admin/templates/${encodeURIComponent(templateId)}/materialize`,
    payload
  );
}