<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\AuditLog;
use App\Models\User;
use App\Support\ClientSecretRotation;
use App\Support\TokenRevocation;
use Illuminate\Http\Request;
use Illuminate\Routing\Controllers\HasMiddleware;
use Illuminate\Routing\Controllers\Middleware;
use Illuminate\Support\Str;
use Illuminate\Validation\Rule;
use Laravel\Passport\Client;
use Laravel\Passport\Http\Middleware\CheckToken;
use OpenApi\Attributes as OA;

#[OA\Schema(
    schema: 'Client',
    type: 'object',
    properties: [
        new OA\Property(property: 'id', type: 'string', format: 'uuid'),
        new OA\Property(property: 'name', type: 'string', example: 'Mi app Angular'),
        new OA\Property(property: 'grant_types', type: 'array', items: new OA\Items(type: 'string'), example: ['authorization_code', 'refresh_token']),
        new OA\Property(property: 'redirect_uris', type: 'array', items: new OA\Items(type: 'string'), example: ['https://mi-app.com/callback']),
        new OA\Property(property: 'revoked', type: 'boolean'),
    ]
)]
class ClientController extends Controller implements HasMiddleware
{
    public static function middleware(): array
    {
        return [
            new Middleware(CheckToken::using('account:read'), only: ['index']),
            new Middleware(CheckToken::using('account:write'), only: ['store', 'update', 'destroy', 'rotateSecret']),
        ];
    }

    #[OA\Get(
        path: '/clients',
        summary: 'Listar tus clientes OAuth (apps que registraste)',
        security: [['oauth2' => ['account:read']]],
        tags: ['Account'],
        responses: [
            new OA\Response(response: 200, description: 'Listado de clientes', content: new OA\JsonContent(type: 'array', items: new OA\Items(ref: '#/components/schemas/Client'))),
            new OA\Response(response: 422, description: 'El token no tiene un usuario asociado (ej. client_credentials)'),
        ]
    )]
    public function index(Request $request)
    {
        return response()->json(
            $this->requireUser($request)->oauthApps()->where('revoked', false)->orderByDesc('created_at')->get()
        );
    }

    #[OA\Post(
        path: '/clients',
        summary: 'Registrar un nuevo cliente OAuth (tu app)',
        security: [['oauth2' => ['account:write']]],
        tags: ['Account'],
        requestBody: new OA\RequestBody(
            required: true,
            content: new OA\JsonContent(
                required: ['name', 'grant_type'],
                properties: [
                    new OA\Property(property: 'name', type: 'string'),
                    new OA\Property(property: 'grant_type', type: 'string', enum: ['authorization_code', 'client_credentials', 'password']),
                    new OA\Property(property: 'redirect_uris', type: 'array', items: new OA\Items(type: 'string')),
                    new OA\Property(property: 'confidential', type: 'boolean', default: true),
                ]
            )
        ),
        responses: [
            new OA\Response(response: 201, description: 'Cliente creado (incluye plain_secret una sola vez)'),
            new OA\Response(response: 422, description: 'Datos inválidos o token sin usuario asociado'),
        ]
    )]
    public function store(Request $request)
    {
        $user = $this->requireUser($request);

        $data = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'grant_type' => ['required', Rule::in(['authorization_code', 'client_credentials', 'password'])],
            'redirect_uris' => ['required_if:grant_type,authorization_code', 'array'],
            'redirect_uris.*' => ['url'],
            'confidential' => ['boolean'],
        ]);

        $confidential = $request->boolean('confidential', true);

        $grantTypes = match ($data['grant_type']) {
            'authorization_code' => ['authorization_code', 'refresh_token'],
            'password' => ['password', 'refresh_token'],
            'client_credentials' => ['client_credentials'],
        };

        // client_credentials always needs a secret: there is no user present to prove identity.
        if ($data['grant_type'] === 'client_credentials') {
            $confidential = true;
        }

        $client = $user->oauthApps()->create([
            'name' => $data['name'],
            'secret' => $confidential ? Str::random(40) : null,
            'provider' => null,
            'redirect_uris' => $data['redirect_uris'] ?? [],
            'grant_types' => $grantTypes,
            'revoked' => false,
        ]);

        AuditLog::record($request, 'client.created', 'client', $client->id, $client->name, [
            'grant_type' => $data['grant_type'],
            'confidential' => $confidential,
        ]);

        return response()->json([
            'client' => $client,
            'plain_secret' => $client->plainSecret,
        ], 201);
    }

    #[OA\Put(
        path: '/clients/{client}',
        summary: 'Editar uno de tus clientes OAuth',
        security: [['oauth2' => ['account:write']]],
        tags: ['Account'],
        parameters: [new OA\Parameter(name: 'client', in: 'path', required: true, schema: new OA\Schema(type: 'string'))],
        responses: [
            new OA\Response(response: 200, description: 'Cliente actualizado', content: new OA\JsonContent(ref: '#/components/schemas/Client')),
            new OA\Response(response: 404, description: 'No es tuyo o no existe'),
        ]
    )]
    public function update(Request $request, Client $client)
    {
        abort_unless($client->owner_id === $this->requireUser($request)->id, 404);

        $data = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'redirect_uris' => ['array'],
            'redirect_uris.*' => ['url'],
        ]);

        $client->update([
            'name' => $data['name'],
            'redirect_uris' => $data['redirect_uris'] ?? $client->redirect_uris,
        ]);

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

    #[OA\Post(
        path: '/clients/{client}/rotate-secret',
        summary: 'Rotar el secret de un client confidencial (el anterior sigue valiendo por 48hs)',
        description: 'El secret anterior no se corta al instante: sigue siendo válido durante un periodo de gracia (48hs), para no romper integraciones ya desplegadas que todavía no se actualizaron al secret nuevo.',
        security: [['oauth2' => ['account:write']]],
        tags: ['Account'],
        parameters: [new OA\Parameter(name: 'client', in: 'path', required: true, schema: new OA\Schema(type: 'string'))],
        responses: [
            new OA\Response(response: 200, description: 'Secret rotado (incluye plain_secret una sola vez)'),
            new OA\Response(response: 404, description: 'No es tuyo o no existe'),
            new OA\Response(response: 422, description: 'El cliente no es confidencial (no tiene secret)'),
        ]
    )]
    public function rotateSecret(Request $request, Client $client)
    {
        abort_unless($client->owner_id === $this->requireUser($request)->id, 404);
        abort_unless($client->confidential(), 422, __('messages.client_not_confidential'));

        $plainSecret = ClientSecretRotation::rotate($client);

        AuditLog::record($request, 'client.secret_rotated', 'client', $client->id, $client->name, [
            'previous_secret_expires_at' => $client->previous_secret_expires_at,
        ]);

        return response()->json([
            'plain_secret' => $plainSecret,
            'previous_secret_expires_at' => $client->previous_secret_expires_at,
        ]);
    }

    #[OA\Delete(
        path: '/clients/{client}',
        summary: 'Revocar uno de tus clientes OAuth (y sus tokens)',
        security: [['oauth2' => ['account:write']]],
        tags: ['Account'],
        parameters: [new OA\Parameter(name: 'client', in: 'path', required: true, schema: new OA\Schema(type: 'string'))],
        responses: [
            new OA\Response(response: 204, description: 'Revocado'),
            new OA\Response(response: 404, description: 'No es tuyo o no existe'),
        ]
    )]
    public function destroy(Request $request, Client $client)
    {
        abort_unless($client->owner_id === $this->requireUser($request)->id, 404);

        $tokens = $client->tokens()->where('revoked', false)->get();

        $client->update(['revoked' => true]);

        foreach ($tokens as $token) {
            TokenRevocation::revoke($token);
        }

        AuditLog::record($request, 'client.revoked', 'client', $client->id, $client->name, [
            'tokens_revoked' => $tokens->count(),
        ]);

        return response()->noContent();
    }

    private function requireUser(Request $request): User
    {
        return $request->user('api') ?? abort(422, __('messages.self_service_requires_user'));
    }
}