<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api\Admin;

use App\Constants\ErrorCode;
use App\Http\Controllers\Controller;
use App\Models\Admin;
use App\Models\Client;
use App\Services\Auth\TokenService;
use App\Services\LogService;
use App\Traits\ApiResponse;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Redis;
use Illuminate\Validation\ValidationException;

class ClientController extends Controller
{
    use ApiResponse;

    private Admin $admin;

    public function __construct(
        private readonly TokenService $tokenService,
        private readonly LogService $logService,
        Request $request
    ) {
        $this->admin = $request->admin;
    }

    /**
     * 檢查客戶是否有活躍的令牌
     */
    private function hasActiveTokens(Client $client): bool
    {
        $pattern = 'auth_token:*';
        $keys = Redis::keys($pattern);

        foreach ($keys as $key) {
            $data = Redis::get($key);
            if ($data) {
                $tokenData = json_decode($data, true);
                if ($tokenData &&
                    $tokenData['client_id'] === $client->id &&
                    now()->isBefore($tokenData['expires_at'])) {
                    return true;
                }
            }
        }

        return false;
    }

    /**
     * 停用客戶
     */
    public function deactivate(int $id): JsonResponse
    {
        try {
            $client = Client::findOrFail($id);

            if (!$this->admin->canManageClient($client->id)) {
                return $this->error(
                    ErrorCode::FORBIDDEN,
                    '您無權管理該客戶。'
                );
            }

            if ($this->hasActiveTokens($client)) {
                return $this->error(
                    ErrorCode::CLIENT_HAS_ACTIVE_TOKENS,
                    '該客戶有活躍的認證令牌，無法停用。'
                );
            }

            $client->update(['status' => Client::STATUS_INACTIVE]);

            $this->logService->logOperation(
                'admin',
                $this->admin->id,
                "Deactivated client: {$client->name}"
            );

            return $this->success();

        } catch (ModelNotFoundException $e) {
            return $this->error(
                ErrorCode::CLIENT_NOT_FOUND,
                ErrorCode::getMessage(ErrorCode::CLIENT_NOT_FOUND)
            );
        } catch (\Exception $e) {
            Log::error('Error deactivating client', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            return $this->error(
                ErrorCode::SERVER_ERROR,
                ErrorCode::getMessage(ErrorCode::SERVER_ERROR)
            );
        }
    }

    /**
     * 刪除客戶
     */
    public function destroy(int $id): JsonResponse
    {
        try {
            $client = Client::findOrFail($id);

            if (!$this->admin->canManageClient($client->id)) {
                return $this->error(
                    ErrorCode::FORBIDDEN,
                    '您無權管理該客戶。'
                );
            }

            if ($this->hasActiveTokens($client)) {
                return $this->error(
                    ErrorCode::CLIENT_HAS_ACTIVE_TOKENS,
                    '該客戶有活躍的認證令牌，無法刪除。'
                );
            }

            $client->delete();

            $this->logService->logOperation(
                'admin',
                $this->admin->id,
                "Deleted client: {$client->name}"
            );

            return $this->success();

        } catch (ModelNotFoundException $e) {
            return $this->error(
                ErrorCode::CLIENT_NOT_FOUND,
                ErrorCode::getMessage(ErrorCode::CLIENT_NOT_FOUND)
            );
        } catch (\Exception $e) {
            Log::error('Error deleting client', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            return $this->error(
                ErrorCode::SERVER_ERROR,
                ErrorCode::getMessage(ErrorCode::SERVER_ERROR)
            );
        }
    }

    /**
     * 為客戶生成認證令牌
     */
    public function generateAuthToken(int $id): JsonResponse
    {
        try {
            $client = Client::findOrFail($id);

            if (!$this->admin->canManageClient($client->id)) {
                return $this->error(
                    ErrorCode::FORBIDDEN,
                    '您無權管理該客戶。'
                );
            }

            if (!$client->isActive()) {
                return $this->error(
                    ErrorCode::CLIENT_INACTIVE,
                    '客戶未啟用，無法生成令牌。'
                );
            }

            $token = $this->tokenService->generateAuthToken($client);

            $this->logService->logOperation(
                'admin',
                $this->admin->id,
                "Generated auth token for client: {$client->name}"
            );

            return $this->success([
                'auth_token' => $token['token'],
                'expires_at' => $token['expires_at'],
                'client' => [
                    'id' => $client->id,
                    'name' => $client->name,
                    'status' => $client->status,
                ],
            ]);

        } catch (ModelNotFoundException $e) {
            return $this->error(
                ErrorCode::CLIENT_NOT_FOUND,
                ErrorCode::getMessage(ErrorCode::CLIENT_NOT_FOUND)
            );
        } catch (\Exception $e) {
            Log::error('Error generating auth token', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            return $this->error(
                ErrorCode::SERVER_ERROR,
                ErrorCode::getMessage(ErrorCode::SERVER_ERROR)
            );
        }
    }
}