"use server";

import { revalidatePath } from "next/cache";
import { currentUserId } from "@/lib/auth/session";
import { withUser } from "@/lib/db";
import { callFunction, runMutation, type ActionResult, type MutationFn } from "@/lib/db/rpc";
import type { CollectiveAgreement, NoteCategory, RelationshipType, Weekday, WorkerType } from "@/lib/supabase/types";

async function callRpc(fn: MutationFn, payload: Record<string, unknown>, revalidate: string[]): Promise<ActionResult> {
  const result = await runMutation(await currentUserId(), fn, payload);
  if (!result.success) return result;
  for (const path of revalidate) revalidatePath(path);
  return result;
}

export async function hireEmployee(payload: {
  first_name: string;
  last_name: string;
  title_prefix?: string[];
  title_suffix?: 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";
  worker_type?: WorkerType;
  collective_agreement?: CollectiveAgreement;
  work_days?: Weekday[];
  is_betriebsrat?: boolean;
  has_dienstwagen?: boolean;
  is_laterale_fuehrung?: boolean;
  is_c_level?: boolean;
}): Promise<ActionResult & { employeeId?: string }> {
  // Einzige Mutation, deren Rückgabewert gebraucht wird: die neue
  // Personen-Kennung, damit die Oberfläche direkt auf die Akte springen kann.
  try {
    const employeeId = await withUser(await currentUserId(), (tx) =>
      callFunction(tx, "hire_employee", payload as Record<string, unknown>)
    );
    revalidatePath("/employees");
    revalidatePath("/");
    revalidatePath("/positions");
    return { success: true, employeeId: employeeId as string };
  } catch (err) {
    return { success: false, error: err instanceof Error ? err.message : "Unbekannter Fehler." };
  }
}

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;
  /** Die Zielplanstelle; Bereich, Abteilung und Team ergeben sich aus ihrer Einheit. */
  target_position_id: 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;
  absence_type: 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>;
  role: 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 async function addEmployeeDependent(payload: {
  employee_id: string;
  first_name: string;
  last_name: string;
  relationship: RelationshipType;
  sv_nummer?: string;
  birth_date: string;
  effective_date: string;
}): Promise<ActionResult> {
  return callRpc("add_employee_dependent", payload, [`/employees/${payload.employee_id}`]);
}

export async function deleteEmployeeDependent(payload: {
  dependent_id: string;
  employee_id: string;
  effective_date: string;
}): Promise<ActionResult> {
  return callRpc("delete_employee_dependent", payload, [`/employees/${payload.employee_id}`]);
}

export async function addEmployeeNote(payload: {
  employee_id: string;
  category: NoteCategory;
  note_text: string;
  due_date?: string;
}): Promise<ActionResult> {
  return callRpc("add_employee_note", payload, [`/employees/${payload.employee_id}`, "/"]);
}

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