/**
 * TypeScript types for the payroll module.
 */

// ── Payroll Run ──────────────────────────────────────────────

export type PayrollRunStatus = "draft" | "confirmed" | "processed";

export interface PayrollRun {
  id: string;
  organisation_id: string;
  period_start: string;
  period_end: string;
  pay_frequency: "weekly" | "fortnightly" | "monthly";
  status: PayrollRunStatus;
  jurisdiction_country_code: string;
  jurisdiction_name: string;
  total_gross: number;
  total_deductions: number;
  total_net: number;
  total_employer_contributions: number;
  confirmed_by: string | null;
  confirmed_at: string | null;
  created_by: string | null;
  created_at: string;
}

// ── Payslip ──────────────────────────────────────────────────

export interface PayslipLineItem {
  name: string;
  amount: number;
  type?: string;
  description?: string;
}

export interface Payslip {
  id: string;
  payroll_run_id: string;
  employee_id: string;
  organisation_id: string;
  gross_pay: number;
  total_deductions: number;
  net_pay: number;
  employer_contributions: number;
  deduction_lines: PayslipLineItem[];
  employer_contribution_lines: PayslipLineItem[];
  hours_worked: number | null;
  hourly_rate: number | null;
  created_at: string;
}

export interface PayslipWithEmployee extends Payslip {
  employee: {
    id: string;
    first_name: string;
    last_name: string;
    email: string;
    job_title: string | null;
  };
}

// ── Payroll Run Summary (for list view) ──────────────────────

export interface PayrollRunSummary {
  id: string;
  period_start: string;
  period_end: string;
  pay_frequency: "weekly" | "fortnightly" | "monthly";
  status: PayrollRunStatus;
  jurisdiction_name: string;
  jurisdiction_country_code: string;
  total_gross: number;
  total_net: number;
  employee_count: number;
  created_at: string;
}

// ── Employee Payroll Preview (for new run) ───────────────────

export interface EmployeePayrollPreview {
  employee_id: string;
  first_name: string;
  last_name: string;
  email: string;
  job_title: string | null;
  employment_type: string;
  annual_salary: number | null;
  hourly_rate: number | null;
  hours_worked: number;
  gross_pay: number;
  deductions: PayslipLineItem[];
  total_deductions: number;
  net_pay: number;
  employer_contributions: PayslipLineItem[];
  total_employer_contributions: number;
}

// ── Create Payroll Run Input ─────────────────────────────────

export interface CreatePayrollRunInput {
  period_start: string;
  period_end: string;
  pay_frequency: "weekly" | "fortnightly" | "monthly";
  employees: {
    employee_id: string;
    hours_worked?: number;
  }[];
}

// ── Helpers ──────────────────────────────────────────────────

export const STATUS_LABELS: Record<PayrollRunStatus, string> = {
  draft: "Draft",
  confirmed: "Confirmed",
  processed: "Processed",
};

export const STATUS_COLORS: Record<PayrollRunStatus, string> = {
  draft: "bg-gray-100 text-gray-600 border-gray-200",
  confirmed: "bg-blue-100 text-blue-700 border-blue-200",
  processed: "bg-emerald-100 text-emerald-700 border-emerald-200",
};

export function formatCurrency(amount: number, currency = "USD"): string {
  const symbols: Record<string, string> = {
    USD: "$", AUD: "A$", GBP: "£", CAD: "C$", NZD: "NZ$",
    EUR: "€", INR: "₹", SGD: "S$", JPY: "¥",
  };
  const sym = symbols[currency] || "$";
  return `${sym}${amount.toLocaleString(undefined, { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;
}

export function formatDateShort(dateStr: string): string {
  return new Date(dateStr + "T00:00:00").toLocaleDateString("en-AU", {
    day: "numeric",
    month: "short",
    year: "numeric",
  });
}