/**
 * Permission Templates API client — reusable permission presets.
 *
 * Backend: /api/v1/permission-templates (list, create, update, delete,
 * apply). Templates define default sharing rules; applying them creates
 * entity_permissions entries automatically.
 * Permissions: templates:read (list) / templates:write (everything else).
 */

import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { apiGet, apiPost, apiPut, apiDelete } from '@/api/client';

export type TemplateLevel = 'read' | 'write' | 'admin' | 'delete';

export interface ShareEntry {
  principal_type?: string;
  principal_id?: string;
  level?: string;
}

export interface PermissionTemplate {
  id: string;
  name: string;
  entity_type: string;
  trigger_condition: Record<string, unknown> | null;
  auto_share_with: ShareEntry[] | null;
  level: TemplateLevel;
  tenant_id: string;
  created_at: string | null;
  updated_at: string | null;
}

export interface TemplateListResponse {
  items: PermissionTemplate[];
  total: number;
}

export interface TemplateCreatePayload {
  name: string;
  entity_type: string;
  level?: TemplateLevel;
  trigger_condition?: Record<string, unknown> | null;
  auto_share_with?: ShareEntry[] | null;
}

export type TemplateUpdatePayload = Partial<TemplateCreatePayload>;

export interface TemplateApplyPayload {
  entity_type: string;
  entity_id: string;
  template_id?: string | null;
}

export interface TemplateApplyResponse {
  applied: Array<Record<string, unknown>>;
  count: number;
}

// ─── Query hooks ─────────────────────────────────────────────

export function usePermissionTemplates(entityType?: string) {
  const qs = entityType ? `?entity_type=${encodeURIComponent(entityType)}` : '';
  return useQuery<TemplateListResponse>({
    queryKey: ['permission-templates', entityType ?? null],
    queryFn: () => apiGet<TemplateListResponse>(`/permission-templates${qs}`),
  });
}

// ─── Mutation hooks ──────────────────────────────────────────

function useInvalidateTemplates() {
  const qc = useQueryClient();
  return () => {
    qc.invalidateQueries({ queryKey: ['permission-templates'] });
  };
}

export function useCreatePermissionTemplate() {
  const invalidate = useInvalidateTemplates();
  return useMutation<PermissionTemplate, Error, TemplateCreatePayload>({
    mutationFn: (data) => apiPost<PermissionTemplate>('/permission-templates', data),
    onSuccess: invalidate,
  });
}

export function useUpdatePermissionTemplate() {
  const invalidate = useInvalidateTemplates();
  return useMutation<
    PermissionTemplate,
    Error,
    { templateId: string; payload: TemplateUpdatePayload }
  >({
    mutationFn: ({ templateId, payload }) =>
      apiPut<PermissionTemplate>(`/permission-templates/${templateId}`, payload),
    onSuccess: invalidate,
  });
}

export function useDeletePermissionTemplate() {
  const invalidate = useInvalidateTemplates();
  return useMutation<void, Error, string>({
    mutationFn: (templateId) => apiDelete(`/permission-templates/${templateId}`),
    onSuccess: invalidate,
  });
}

export function useApplyPermissionTemplate() {
  return useMutation<TemplateApplyResponse, Error, TemplateApplyPayload>({
    mutationFn: (data) => apiPost<TemplateApplyResponse>('/permission-templates/apply', data),
  });
}