<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use App\Models\LoginEvent;
use App\Models\User;
use App\Support\TwoFactorVerification;
use Database\Seeders\RolesAndPermissionsSeeder;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Hash;
use Illuminate\Validation\Rule;
use Illuminate\Validation\ValidationException;

class AuthController extends Controller
{
    public function setupStatus()
    {
        return response()->json([
            'empty' => User::query()->count() === 0,
        ]);
    }

    public function register(Request $request)
    {
        $data = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'email' => ['required', 'string', 'email', 'max:255', Rule::unique('users', 'email')],
            'password' => ['required', 'string', 'min:8', 'confirmed'],
        ]);

        // Instalación nueva (sin usuarios todavía): el primero en registrarse
        // queda como admin, aprobado y logueado de una — no hay nadie más que
        // pueda aprobarlo. De ahí en más, todo registro vuelve a requerir
        // aprobación de un admin como siempre.
        $isFirstUser = User::query()->count() === 0;

        $user = User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => Hash::make($data['password']),
            'is_active' => true,
            'approved_at' => $isFirstUser ? now() : null,
        ]);

        if ($isFirstUser) {
            (new RolesAndPermissionsSeeder)->run();
            $user->assignRole('admin');

            Auth::login($user);
            $request->session()->regenerate();
            $this->recordSessionLogin($request, $user);

            return response()->json([
                'bootstrap' => true,
                'user' => $this->present($user),
                'intended' => $request->session()->pull('url.intended'),
            ]);
        }

        $user->assignRole('user');

        return response()->json([
            'pending' => true,
            'message' => __('messages.registration_pending'),
        ], 201);
    }

    public function login(Request $request)
    {
        $credentials = $request->validate([
            'email' => ['required', 'string', 'email'],
            'password' => ['required', 'string'],
        ]);

        // Auth::validate() (no attempt()): solo chequea credenciales, no
        // loguea todavía — necesitamos poder frenar acá mismo si el usuario
        // tiene 2FA activo, antes de que exista sesión autenticada.
        if (! Auth::validate($credentials)) {
            $this->recordFailedLogin($request);

            throw ValidationException::withMessages([
                'email' => __('messages.invalid_credentials'),
            ]);
        }

        $user = User::where('email', $credentials['email'])->first();

        if (! $user->is_active) {
            throw ValidationException::withMessages([
                'email' => __('messages.account_deactivated'),
            ]);
        }

        if ($user->isPending()) {
            throw ValidationException::withMessages([
                'email' => __('messages.account_pending_approval'),
            ]);
        }

        if ($user->hasTwoFactorEnabled()) {
            $request->session()->put('login.mfa_user_id', $user->id);
            $request->session()->put('login.mfa_remember', $request->boolean('remember'));

            return response()->json(['two_factor' => true]);
        }

        Auth::login($user, $request->boolean('remember'));
        $request->session()->regenerate();
        $this->recordSessionLogin($request, $user);

        return response()->json([
            'user' => $this->present($user),
            'intended' => $request->session()->pull('url.intended'),
        ]);
    }

    /**
     * Segundo paso del login cuando el usuario tiene 2FA activo: recibe un
     * código TOTP o de recuperación y, si es válido, recién ahí crea la sesión.
     */
    public function loginTwoFactor(Request $request)
    {
        $data = $request->validate([
            'code' => ['required', 'string'],
        ]);

        $userId = $request->session()->get('login.mfa_user_id');
        $user = $userId ? User::find($userId) : null;

        if (! $user || ! TwoFactorVerification::verify($user, $data['code'])) {
            throw ValidationException::withMessages([
                'code' => __('messages.invalid_two_factor_code'),
            ]);
        }

        $remember = $request->session()->pull('login.mfa_remember', false);
        $request->session()->forget('login.mfa_user_id');

        Auth::login($user, $remember);
        $request->session()->regenerate();
        $this->recordSessionLogin($request, $user);

        return response()->json([
            'user' => $this->present($user),
            'intended' => $request->session()->pull('url.intended'),
        ]);
    }

    public function logout(Request $request)
    {
        Auth::logout();
        $request->session()->invalidate();
        $request->session()->regenerateToken();

        return response()->noContent();
    }

    public function me(Request $request)
    {
        return response()->json(['user' => $this->present($request->user())]);
    }

    private function recordSessionLogin(Request $request, User $user): void
    {
        LoginEvent::create([
            'user_id' => $user->id,
            'client_id' => null,
            'type' => 'session',
            'outcome' => 'success',
            'ip_address' => $request->ip(),
            'user_agent' => $request->userAgent(),
            'created_at' => now(),
        ]);
    }

    // Solo credenciales inválidas (la señal relevante para detectar fuerza
    // bruta) — cuenta desactivada o pendiente de aprobación no cuenta como
    // "fallo" para esta métrica, son estados de cuenta, no intentos de ataque.
    private function recordFailedLogin(Request $request): void
    {
        LoginEvent::create([
            'user_id' => null,
            'client_id' => null,
            'type' => 'session',
            'outcome' => 'failure',
            'ip_address' => $request->ip(),
            'user_agent' => $request->userAgent(),
            'created_at' => now(),
        ]);
    }

    private function present(User $user): array
    {
        return [
            ...$user->toArray(),
            'roles' => $user->getRoleNames(),
            'permissions' => $user->getAllPermissions()->pluck('name'),
            'two_factor_enabled' => $user->hasTwoFactorEnabled(),
        ];
    }
}