<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Requests\LoginRequest;
use App\Http\Requests\RegisterRequest;
use App\Models\LegalDocument;
use App\Models\User;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Hash;
use Illuminate\Validation\Rule;
use Illuminate\Validation\ValidationException;

/**
 * Authentication endpoints for the City10 REST API.
 *
 * Issues personal access tokens (Laravel Sanctum) consumed by the 3D
 * frontend and by external integrations.
 */
class AuthController extends Controller
{
    /**
     * Issue a fresh math CAPTCHA challenge for the login/registration forms.
     *
     * The expected result is stored server-side in the session, so clients
     * only receive the question to solve.
     */
    public function captcha(): JsonResponse
    {
        $a = random_int(1, 9);
        $b = random_int(1, 9);

        session()->put('captcha_result', $a + $b);
        session()->put('captcha_expires_at', now()->addMinutes(10)->getTimestamp());

        return response()->json([
            'question' => sprintf('%d + %d = ?', $a, $b),
        ]);
    }

    /**
     * Register a new regular user account.
     *
     * Applies a simple math CAPTCHA and immediately records acceptance of
     * the current legal documents when the client confirms them.
     */
    public function register(RegisterRequest $request): JsonResponse
    {
        $data = $request->validated();

        $user = User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => $data['password'],
            'role' => User::ROLE_USER,
            'locale' => $data['locale'] ?? 'pt_BR',
            'is_active' => true,
        ]);

        $token = $user->createToken('city10-api')->plainTextToken;

        return response()->json([
            'user' => $user,
            'token' => $token,
            'token_type' => 'Bearer',
        ], 201);
    }

    /**
     * Authenticate a user and return an API token.
     */
    public function login(LoginRequest $request): JsonResponse
    {
        $user = User::where('email', $request->validated('email'))->first();

        if ($user === null || ! Hash::check($request->validated('password'), $user->password)) {
            throw ValidationException::withMessages([
                'email' => [__('auth.failed')],
            ]);
        }

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

        $user->forceFill(['last_login_at' => now()])->save();

        $token = $user->createToken('city10-api')->plainTextToken;

        return response()->json([
            'user' => $user,
            'token' => $token,
            'token_type' => 'Bearer',
            'requires_terms' => ! $user->hasAcceptedCurrentTerms(),
        ]);
    }

    /**
     * Update the authenticated user's own profile (name, locale, password).
     *
     * Role and active status are intentionally excluded: those are managed
     * exclusively through the admin endpoints.
     */
    public function updateProfile(Request $request): JsonResponse
    {
        $data = $request->validate([
            'name' => ['sometimes', 'string', 'max:120'],
            'locale' => ['sometimes', Rule::in(['pt_BR', 'en', 'es'])],
            'password' => ['sometimes', 'string', 'min:8', 'confirmed'],
        ]);

        $user = $request->user();

        if (! empty($data['password'])) {
            $user->password = $data['password'];
            unset($data['password']);
        }

        $user->fill($data)->save();

        return response()->json($user);
    }

    /**
     * Revoke the token used for the current request.
     */
    public function logout(Request $request): JsonResponse
    {
        $request->user()->currentAccessToken()?->delete();

        return response()->json(['message' => __('auth.logged_out')]);
    }

    /**
     * Return the authenticated user plus consent status.
     */
    public function me(Request $request): JsonResponse
    {
        $user = $request->user();

        $currentDocuments = LegalDocument::query()
            ->where('is_current', true)
            ->get(['id', 'type', 'version']);

        $acceptedIds = $user->consents()->pluck('legal_document_id');

        return response()->json([
            'user' => $user,
            'requires_terms' => ! $user->hasAcceptedCurrentTerms(),
            'pending_documents' => $currentDocuments
                ->reject(fn ($doc) => $acceptedIds->contains($doc->id))
                ->values(),
        ]);
    }
}