<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Resources\UserResource;
use App\Models\User;
use App\Services\JwtService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Validator;

/**
 * @group Authentication
 *
 * Endpoints for JWT authentication and session lifecycle.
 */
class AuthController extends Controller
{
    /**
     * JWT Service instance
     */
    protected JwtService $jwtService;

    /**
     * Constructor
     */
    public function __construct(JwtService $jwtService)
    {
        $this->jwtService = $jwtService;
    }

    /**
     * Login and get tokens
     *
     * Authenticate with email and password to receive an access token and refresh token.
     *
     * @bodyParam email string required User email address. Example: user@example.com
     * @bodyParam password string required User password. Example: secret123
     *
     * @response 200 {
     *   "data": {
     *     "id": "550e8400-e29b-41d4-a716-446655440000",
     *     "name": "Alice Johnson",
     *     "email": "user@example.com",
     *     "role": "manager",
     *     "active": true,
     *     "created_at": "2026-01-01T00:00:00Z",
     *     "updated_at": "2026-01-01T00:00:00Z"
     *   },
     *   "access_token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9...",
     *   "refresh_token": "abc123def456",
     *   "token_type": "bearer",
     *   "expires_in": 3600
     * }
     * @response 401 {"message":"Invalid credentials"}
     * @response 403 {"message":"Account is inactive"}
     * @response 422 {"errors":{"email":["The email field is required."],"password":["The password field is required."]}}
     */
    public function login(Request $request): JsonResponse
    {
        $validator = Validator::make($request->all(), [
            'email' => 'required|string|email',
            'password' => 'required|string',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'message' => 'Validation failed',
                'errors' => $validator->errors(),
            ], 422);
        }

        $user = User::where('email', $request->email)->first();

        if (! $user || ! Hash::check($request->password, $user->password)) {
            return response()->json([
                'message' => 'Invalid credentials',
            ], 401);
        }

        if (! $user->active) {
            return response()->json([
                'message' => 'Account is inactive',
            ], 403);
        }

        $accessToken = $this->jwtService->generateAccessToken($user);
        $refreshToken = $this->jwtService->generateRefreshToken($user);

        return (new UserResource($user))->additional([
            'access_token' => $accessToken,
            'refresh_token' => $refreshToken,
            'token_type' => 'bearer',
            'expires_in' => $this->jwtService->getAccessTokenTTL(),
        ])->response();
    }

    /**
     * Refresh access token
     *
     * Exchange a valid refresh token for a new access token and refresh token pair.
     *
     * @authenticated
     *
     * @bodyParam refresh_token string required Refresh token returned by login. Example: abc123def456
     *
     * @response 200 {
     *   "data": {
     *     "id": "550e8400-e29b-41d4-a716-446655440000",
     *     "name": "Alice Johnson",
     *     "email": "user@example.com",
     *     "role": "manager",
     *     "active": true,
     *     "created_at": "2026-01-01T00:00:00Z",
     *     "updated_at": "2026-01-01T00:00:00Z"
     *   },
     *   "access_token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9...",
     *   "refresh_token": "newtoken123",
     *   "token_type": "bearer",
     *   "expires_in": 3600
     * }
     * @response 401 {"message":"Invalid or expired refresh token"}
     */
    public function refresh(Request $request): JsonResponse
    {
        $refreshToken = $request->input('refresh_token');

        if (empty($refreshToken)) {
            return response()->json([
                'message' => 'Refresh token is required',
            ], 422);
        }

        $userId = $this->jwtService->getUserIdFromRefreshToken($refreshToken);

        if (! $userId) {
            return response()->json([
                'message' => 'Invalid or expired refresh token',
            ], 401);
        }

        $user = User::find($userId);

        if (! $user) {
            return response()->json([
                'message' => 'Invalid or expired refresh token',
            ], 401);
        }

        $this->jwtService->invalidateRefreshToken($refreshToken, $userId);

        $accessToken = $this->jwtService->generateAccessToken($user);
        $newRefreshToken = $this->jwtService->generateRefreshToken($user);

        return (new UserResource($user))->additional([
            'access_token' => $accessToken,
            'refresh_token' => $newRefreshToken,
            'token_type' => 'bearer',
            'expires_in' => $this->jwtService->getAccessTokenTTL(),
        ])->response();
    }

    /**
     * Logout current session
     *
     * Invalidate a refresh token and end the active authenticated session.
     *
     * @authenticated
     *
     * @bodyParam refresh_token string Optional refresh token to invalidate immediately. Example: abc123def456
     *
     * @response 200 {"message":"Logged out successfully"}
     */
    public function logout(Request $request): JsonResponse
    {
        $user = $request->user();
        $refreshToken = $request->input('refresh_token');

        if ($refreshToken) {
            $this->jwtService->invalidateRefreshToken($refreshToken, $user?->id);
        }

        return response()->json([
            'message' => 'Logged out successfully',
        ]);
    }
}