/**
 * TypeScript types for the employee management module.
 */

// ── Departments ──────────────────────────────────────────────

export interface Department {
  id: string;
  organisation_id: string;
  name: string;
  created_at: string;
}

// ── Employees ────────────────────────────────────────────────

export type EmploymentType = "full_time" | "part_time" | "casual" | "contractor";
export type PayFrequency = "weekly" | "fortnightly" | "monthly";
export type EmployeeStatus = "active" | "on_leave" | "terminated";

export interface Employee {
  id: string;
  organisation_id: string;
  user_id: string | null;
  first_name: string;
  last_name: string;
  email: string;
  phone: string | null;
  date_of_birth: string | null;
  address: string | null;
  job_title: string | null;
  department_id: string | null;
  employment_type: EmploymentType;
  start_date: string | null;
  end_date: string | null;
  salary: number | null;
  hourly_rate: number | null;
  pay_frequency: PayFrequency;
  status: EmployeeStatus;
  manager_id: string | null;
  created_at: string;
}

export interface EmployeeWithRelations extends Employee {
  department: Department | null;
  department_name?: string;
  manager: { first_name: string; last_name: string } | null;
  employee_roles?: any[];
  resignation_status?: string;
  resignation_date?: string;
  resignation_reason?: string;
}

// ── Pending Invitations ──────────────────────────────────────

export type InvitationStatus = "pending" | "accepted" | "expired";

export interface PendingInvitation {
  id: string;
  organisation_id: string;
  email: string;
  token: string;
  role: string;
  status: InvitationStatus;
  invited_by: string | null;
  expires_at: string;
  created_at: string;
}

// ── Form Inputs ──────────────────────────────────────────────

export interface CreateEmployeeInput {
  first_name: string;
  last_name: string;
  email: string;
  phone?: string;
  date_of_birth?: string;
  address?: string;
  job_title?: string;
  department_id?: string;
  employment_type: EmploymentType;
  start_date?: string;
  salary?: number;
  hourly_rate?: number;
  pay_frequency: PayFrequency;
  manager_id?: string;
}

export interface UpdateEmployeeInput {
  first_name?: string;
  last_name?: string;
  email?: string;
  phone?: string | null;
  date_of_birth?: string;
  address?: string | null;
  job_title?: string | null;
  department_id?: string | null;
  employment_type?: EmploymentType;
  start_date?: string;
  end_date?: string | null;
  salary?: number | null;
  hourly_rate?: number | null;
  pay_frequency?: PayFrequency;
  status?: EmployeeStatus;
  manager_id?: string | null;
}

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

export const EMPLOYMENT_TYPE_LABELS: Record<EmploymentType, string> = {
  full_time: "Full time",
  part_time: "Part time",
  casual: "Casual",
  contractor: "Contractor",
};

export const PAY_FREQUENCY_LABELS: Record<PayFrequency, string> = {
  weekly: "Weekly",
  fortnightly: "Fortnightly",
  monthly: "Monthly",
};

export const EMPLOYEE_STATUS_LABELS: Record<EmployeeStatus, string> = {
  active: "Active",
  on_leave: "On leave",
  terminated: "Terminated",
};

export function getInitials(first: string, last: string): string {
  return `${first.charAt(0)}${last.charAt(0)}`.toUpperCase();
}

export function formatCurrency(amount: number | null, frequency?: string): string {
  if (amount == null) return "—";
  const formatted = `$${amount.toLocaleString()}`;
  return frequency ? `${formatted}/${frequency === "monthly" ? "mo" : frequency === "fortnightly" ? "fn" : "wk"}` : formatted;
}