/**
 * Personal dashboards API hooks (Phase M2/M3).
 *
 * Layout shape (validated server-side, DashboardLayout):
 * { version: 1, tabs: [{ id, name, widgets: [{ app_id, settings, col, row, col_span, row_span }] }] }
 */

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

export interface DashboardWidget {
  app_id: string;
  settings: Record<string, unknown>;
  col: number;
  row: number;
  col_span: number;
  row_span: number;
}

export interface DashboardTab {
  id: string;
  name: string;
  widgets: DashboardWidget[];
}

export interface DashboardLayout {
  version: number;
  tabs: DashboardTab[];
}

export interface Dashboard {
  id: string;
  name: string;
  layout: DashboardLayout;
  is_default: boolean;
  user_id: string;
  created_at: string | null;
  updated_at: string | null;
}

export interface DashboardInput {
  name: string;
}

export interface DashboardUpdateInput {
  name?: string;
  layout?: DashboardLayout;
}

export const DASHBOARD_QUERY_KEYS = {
  all: ['dashboards'] as const,
  one: (id: string) => ['dashboards', id] as const,
};

export function useDashboards() {
  return useQuery({
    queryKey: DASHBOARD_QUERY_KEYS.all,
    queryFn: () => apiGet<Dashboard[]>('/dashboards'),
    staleTime: 30 * 1000,
  });
}

export function useCreateDashboard() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (input: DashboardInput) => apiPost<Dashboard>('/dashboards', input),
    onSuccess: () => qc.invalidateQueries({ queryKey: DASHBOARD_QUERY_KEYS.all }),
  });
}

export function useUpdateDashboard() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: ({ id, input }: { id: string; input: DashboardUpdateInput }) =>
      apiPut<Dashboard>(`/dashboards/${id}`, input),
    onSuccess: (_data, vars) => {
      qc.invalidateQueries({ queryKey: DASHBOARD_QUERY_KEYS.all });
      qc.invalidateQueries({ queryKey: DASHBOARD_QUERY_KEYS.one(vars.id) });
    },
  });
}

export function useDeleteDashboard() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (id: string) => apiDelete<void>(`/dashboards/${id}`),
    onSuccess: () => qc.invalidateQueries({ queryKey: DASHBOARD_QUERY_KEYS.all }),
  });
}

export function useSetDefaultDashboard() {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: (id: string) => apiPost<Dashboard>(`/dashboards/${id}/set-default`),
    onSuccess: () => qc.invalidateQueries({ queryKey: DASHBOARD_QUERY_KEYS.all }),
  });
}