import { apiRequestData } from "./http";

export type DashboardQuery = {
  dateFrom?: string;
  dateTo?: string;
  departmentId?: string;
  limit?: number;
};

function toQueryString(query: DashboardQuery = {}) {
  const params = new URLSearchParams();
  if (query.dateFrom) params.set("dateFrom", query.dateFrom);
  if (query.dateTo) params.set("dateTo", query.dateTo);
  if (query.departmentId) params.set("departmentId", query.departmentId);
  if (query.limit != null) params.set("limit", String(query.limit));
  const encoded = params.toString();
  return encoded ? `?${encoded}` : "";
}

export type DashboardExpenseOverview = {
  totalCount: number;
  totalAmount: string;
  paidCount: number;
  paidAmount: string;
  reviewingCount: number;
};

export type DashboardTrendPoint = {
  date: string;
  amount: string;
  count: number;
};

export type DashboardTopCategory = {
  code: string;
  name: string;
  amount: string;
  count: number;
};

export type DashboardApprovalEfficiency = {
  approvedCount: number;
  averageHours: number;
};

export async function fetchDashboardOverview(query: DashboardQuery = {}) {
  return apiRequestData<DashboardExpenseOverview>(`/api/dashboard/expense-overview${toQueryString(query)}`);
}

export async function fetchDashboardTrends(query: DashboardQuery = {}) {
  return apiRequestData<{ points: DashboardTrendPoint[] }>(`/api/dashboard/trends${toQueryString(query)}`);
}

export async function fetchDashboardTopCategories(query: DashboardQuery = {}) {
  return apiRequestData<{ items: DashboardTopCategory[] }>(`/api/dashboard/top-categories${toQueryString(query)}`);
}

export async function fetchDashboardApprovalEfficiency(query: DashboardQuery = {}) {
  return apiRequestData<DashboardApprovalEfficiency>(`/api/dashboard/approval-efficiency${toQueryString(query)}`);
}