import { hrApi } from "@/auth/http";
import type {
  EmployeeSalary,
  IncomeTaxBracket,
  PayrollRun,
  PayrollRunStatus,
  Payslip,
  SalaryComponent,
  SalaryStructure,
  StatutoryRate,
} from "./types";

interface Page<T> {
  items: T[];
  total: number;
  page: number;
  pageCount: number;
}

export const seedPayrollStatutory = async () => {
  const response = await hrApi.post<{
    components: { created: string[]; skipped: string[] };
    taxBands: string;
    rates: { created: string[]; skipped: string[] };
  }>("/payroll/seed-statutory");
  return response.data;
};

export const listComponents = async (): Promise<SalaryComponent[]> => {
  const response = await hrApi.get<SalaryComponent[]>("/payroll/components");
  return response.data;
};

export const listStructures = async (): Promise<SalaryStructure[]> => {
  const response = await hrApi.get<SalaryStructure[]>("/payroll/structures");
  return response.data;
};

export const getStructure = async (id: string): Promise<SalaryStructure> => {
  const response = await hrApi.get<SalaryStructure>(`/payroll/structures/${id}`);
  return response.data;
};

export const createStructure = async (payload: {
  code: string;
  name: { am: string; en: string };
  lines?: { salaryComponentId: string; amount?: string; rate?: string }[];
}) => {
  const response = await hrApi.post<SalaryStructure>("/payroll/structures", payload);
  return response.data;
};

export const listTaxBrackets = async (): Promise<IncomeTaxBracket[]> => {
  const response = await hrApi.get<IncomeTaxBracket[]>("/payroll/tax-brackets");
  return response.data;
};

export const listStatutoryRates = async (): Promise<StatutoryRate[]> => {
  const response = await hrApi.get<StatutoryRate[]>("/payroll/statutory-rates");
  return response.data;
};

export const assignSalary = async (payload: {
  employeeId: string;
  basicSalary: string;
  salaryStructureId?: string;
  effectiveFrom: string;
  reason?: string;
}) => {
  const response = await hrApi.post<EmployeeSalary>("/payroll/salaries", payload);
  return response.data;
};

export const getSalaryHistory = async (employeeId: string) => {
  const response = await hrApi.get<EmployeeSalary[]>(
    `/payroll/salaries/${employeeId}`,
  );
  return response.data;
};

// ── Runs ────────────────────────────────────────────────────────────────────

export const listPayrollRuns = async (params?: {
  status?: PayrollRunStatus;
  page?: number;
  limit?: number;
}) => {
  const response = await hrApi.get<Page<PayrollRun>>("/payroll-runs", { params });
  return response.data;
};

export const getPayrollRun = async (id: string): Promise<PayrollRun> => {
  const response = await hrApi.get<PayrollRun>(`/payroll-runs/${id}`);
  return response.data;
};

export const createPayrollRun = async (payload: {
  periodStart: string;
  periodEnd: string;
  paymentDate?: string;
  note?: string;
}) => {
  const response = await hrApi.post<PayrollRun>("/payroll-runs", payload);
  return response.data;
};

export const calculatePayrollRun = async (id: string) => {
  const response = await hrApi.post<PayrollRun>(`/payroll-runs/${id}/calculate`);
  return response.data;
};

export const approvePayrollRun = async (id: string) => {
  const response = await hrApi.patch<PayrollRun>(`/payroll-runs/${id}/approve`);
  return response.data;
};

export const markPayrollPaid = async (id: string, paymentDate?: string) => {
  const response = await hrApi.patch<PayrollRun>(`/payroll-runs/${id}/mark-paid`, {
    paymentDate,
  });
  return response.data;
};

export const cancelPayrollRun = async (id: string) => {
  const response = await hrApi.patch<PayrollRun>(`/payroll-runs/${id}/cancel`);
  return response.data;
};

export const listRunPayslips = async (id: string): Promise<Payslip[]> => {
  const response = await hrApi.get<Payslip[]>(`/payroll-runs/${id}/payslips`);
  return response.data;
};

export const getPayslip = async (id: string): Promise<Payslip> => {
  const response = await hrApi.get<Payslip>(`/payroll-runs/payslips/${id}`);
  return response.data;
};

export const getMyPayslips = async (): Promise<Payslip[]> => {
  const response = await hrApi.get<Payslip[]>("/payroll-runs/my-payslips");
  return response.data;
};