"use server";

import { cookies } from "next/headers";
import { redirect } from "next/navigation";
import { AppwriteException, ID } from "node-appwrite";

import { APPWRITE_SESSION_COOKIE, createAdminClient, createSessionClient } from "./server";
import type { AuthState } from "./auth-types";

function appwriteError(e: unknown): string {
  if (e instanceof AppwriteException) {
    switch (e.type) {
      case "user_invalid_credentials":
        return "Email veya şifre hatalı.";
      case "user_blocked":
        return "Hesabınız engellenmiş.";
      case "user_already_exists":
      case "user_email_already_exists":
        return "Bu email ile zaten bir hesap var.";
      case "user_password_mismatch":
        return "Şifreler eşleşmiyor.";
      case "general_rate_limit_exceeded":
        return "Çok fazla deneme. Birkaç dakika sonra tekrar deneyin.";
      default:
        return e.message || "Beklenmeyen bir hata oluştu.";
    }
  }
  return "Bağlantı hatası. Tekrar deneyin.";
}

async function setSessionCookie(secret: string, expire: string) {
  (await cookies()).set(APPWRITE_SESSION_COOKIE, secret, {
    path: "/",
    httpOnly: true,
    sameSite: "strict",
    secure: process.env.NODE_ENV === "production",
    expires: new Date(expire),
  });
}

export async function signInAction(_prev: AuthState, formData: FormData): Promise<AuthState> {
  const email = String(formData.get("email") ?? "").trim();
  const password = String(formData.get("password") ?? "");

  if (!email || !password) {
    return { ok: false, error: "Email ve şifre zorunlu." };
  }

  try {
    const { account } = createAdminClient();
    const session = await account.createEmailPasswordSession(email, password);
    await setSessionCookie(session.secret, session.expire);
  } catch (e) {
    return { ok: false, error: appwriteError(e) };
  }

  redirect("/dashboard");
}

export async function signUpAction(_prev: AuthState, formData: FormData): Promise<AuthState> {
  const name = String(formData.get("name") ?? "").trim();
  const email = String(formData.get("email") ?? "").trim();
  const password = String(formData.get("password") ?? "");

  if (!name || !email || !password) {
    return { ok: false, error: "Tüm alanlar zorunlu." };
  }
  if (password.length < 8) {
    return { ok: false, error: "Şifre en az 8 karakter olmalı." };
  }

  try {
    const { account } = createAdminClient();
    await account.create(ID.unique(), email, password, name);
    const session = await account.createEmailPasswordSession(email, password);
    await setSessionCookie(session.secret, session.expire);
  } catch (e) {
    return { ok: false, error: appwriteError(e) };
  }

  redirect("/onboarding");
}

export async function forgotPasswordAction(
  _prev: AuthState,
  formData: FormData,
): Promise<AuthState> {
  const email = String(formData.get("email") ?? "").trim();
  if (!email) return { ok: false, error: "Email zorunlu." };

  try {
    const { account } = createAdminClient();
    const recoveryUrl = `${process.env.APP_URL ?? "http://localhost:3000"}/reset-password`;
    await account.createRecovery(email, recoveryUrl);
    return { ok: true };
  } catch (e) {
    return { ok: false, error: appwriteError(e) };
  }
}

export async function signOutAction() {
  try {
    const { account } = await createSessionClient();
    await account.deleteSession("current");
  } catch {
    // ignore — cookie will be cleared anyway
  }
  (await cookies()).delete(APPWRITE_SESSION_COOKIE);
  redirect("/sign-in");
}