"use server";

import { revalidatePath } from "next/cache";
import { sanitizeIlikeTerm } from "@/lib/supabase/query";
import { createClient } from "@/lib/supabase/server";
import type { Database } from "@/lib/supabase/types";

type ActionResult = { success: boolean; error?: string };
type MutationFn = keyof Database["public"]["Functions"];

async function callRpc(fn: MutationFn, payload: Record<string, unknown>, revalidate: string[]): Promise<ActionResult> {
  const supabase = await createClient();
  const { error } = await supabase.rpc(fn, { payload });
  if (error) return { success: false, error: error.message };
  for (const path of revalidate) revalidatePath(path);
  return { success: true };
}

export async function hireEmployee(payload: {
  first_name: string;
  last_name: string;
  gender: "m" | "w";
  birth_date: string;
  sv_nummer?: string;
  phone?: string;
  position_id?: string;
  team_id?: string;
  job_title?: string;
  location_id: string;
  entry_date: string;
  contract_type?: "unbefristet" | "befristet";
  contract_end_date?: string;
  employment_type?: "Vollzeit" | "Teilzeit";
  weekly_hours?: number;
  paygrade?: "A" | "B" | "C" | "D" | "E" | "F";
  source: "Intern" | "Extern";
}): Promise<ActionResult & { employeeId?: string }> {
  const supabase = await createClient();
  const { data, error } = await supabase.rpc("hire_employee", { payload });
  if (error) return { success: false, error: error.message };
  revalidatePath("/employees");
  revalidatePath("/");
  revalidatePath("/positions");
  return { success: true, employeeId: data as string };
}

export async function terminateEmployee(payload: {
  employee_id: string;
  exit_date: string;
  exit_reason: string;
  note?: string;
}): Promise<ActionResult> {
  return callRpc("terminate_employee", payload, [`/employees/${payload.employee_id}`, "/employees", "/"]);
}

export async function transferEmployee(payload: {
  employee_id: string;
  effective_date: string;
  new_team_id: string;
  new_title?: string;
}): Promise<ActionResult> {
  return callRpc("transfer_employee", payload, [`/employees/${payload.employee_id}`, "/employees"]);
}

export async function promoteEmployee(payload: {
  employee_id: string;
  effective_date: string;
  new_title: string;
  new_paygrade?: "A" | "B" | "C" | "D" | "E" | "F";
}): Promise<ActionResult> {
  return callRpc("promote_employee", payload, [`/employees/${payload.employee_id}`, "/employees"]);
}

export async function startKarenz(payload: {
  employee_id: string;
  karenz_start_date: string;
  planned_return_date: string;
  note?: string;
}): Promise<ActionResult> {
  return callRpc("start_karenz", payload, [`/employees/${payload.employee_id}`, "/employees", "/"]);
}

export async function adjustKarenzReturn(payload: {
  employee_id: string;
  new_return_date: string;
  note?: string;
}): Promise<ActionResult> {
  return callRpc("adjust_karenz_return", payload, [`/employees/${payload.employee_id}`]);
}

export async function recordKarenzReturn(payload: {
  employee_id: string;
  return_date: string;
  employment_mode: "unverändert" | "Vollzeit" | "Teilzeit";
  weekly_hours?: number;
}): Promise<ActionResult> {
  return callRpc("record_karenz_return", payload, [`/employees/${payload.employee_id}`, "/employees", "/"]);
}

export async function changeEmployeeData(payload: {
  employee_id: string;
  effective_date: string;
  person: Record<string, unknown>;
  contract: Record<string, unknown>;
}): Promise<ActionResult> {
  return callRpc("change_employee_data", payload, [`/employees/${payload.employee_id}`, "/employees"]);
}

export async function rehireEmployee(payload: { employee_id: string; rehire_date: string }): Promise<ActionResult> {
  return callRpc("rehire_employee", payload, [`/employees/${payload.employee_id}`, "/employees", "/"]);
}

export type EmployeeSearchResult = { id: string; first_name: string; last_name: string; job_title: string; team_id: string | null };

// Shared by "Intern besetzen" (staff an open position) and the reorg
// workbench's "Mitarbeiter:in(nen)" multi-select — both search active/
// on-leave employees by name or title.
export async function searchActiveEmployees(query: string): Promise<EmployeeSearchResult[]> {
  const supabase = await createClient();
  let q = supabase
    .from("employees")
    .select("id, first_name, last_name, job_title, team_id")
    .in("status", ["Aktiv", "Karenz"])
    .limit(20);
  if (query.trim()) {
    const term = sanitizeIlikeTerm(query.trim());
    q = q.or(`first_name.ilike.%${term}%,last_name.ilike.%${term}%,job_title.ilike.%${term}%`);
  }
  const { data } = await q;
  return data ?? [];
}