<?php

namespace App\Services\Smm;

use App\Services\Contracts\SmmPlatformInterface;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Session;

class FacebookService implements SmmPlatformInterface
{
    protected $configData;
    protected $graphVersion = 'v19.0';

    public function __construct($configData)
    {
        $this->configData = $configData;
    }

    public function login()
    {
        $permissions = [
            'publish_video',
            'pages_manage_cta',
            'pages_show_list',
            'business_management',
            'pages_read_engagement',
            'pages_manage_metadata',
            'pages_read_user_content',
            'pages_manage_ads',
            'pages_manage_posts',
            'pages_manage_engagement',
        ];

        $query = http_build_query([
            'client_id'        => env('SSM_FACEBOOK_APP_ID'),
            'redirect_uri'     => env('DIST_SITE_URL').'/dist/callback/facebook',
            'response_type'   => 'code',
            'scope'           => implode(',', $permissions),
            'state'           => csrf_token(),
        ]);

        return ['status' => true, 'data' => ['url' => "https://www.facebook.com/{$this->graphVersion}/dialog/oauth?{$query}"]];
    }

    public function loginCallback(Request $request)
    {
        // 验证 state 防止 CSRF
        if ($request->state !== csrf_token()) {
            return ['status' => false, 'data' => 'Invalid state parameter'];
        }

        try {
            // 获取短期访问令牌
            $response = Http::asForm()->post("https://graph.facebook.com/{$this->graphVersion}/oauth/access_token", [
                'client_id'     => env('SSM_FACEBOOK_APP_ID'),
                'client_secret' => env('SSM_FACEBOOK_APP_SECRET'),
                'redirect_uri'  => env('DIST_SITE_URL').'/dist/callback/facebook',
                'code'          => $request->code,
            ]);

            if ($response->failed()) {
                throw new \Exception($response->json('error.message'));
            }

            $shortToken = $response->json('access_token');

            // 转换为长期令牌
            $longTokenResponse = Http::get("https://graph.facebook.com/{$this->graphVersion}/oauth/access_token", [
                'grant_type'        => 'fb_exchange_token',
                'client_id'         => env('SSM_FACEBOOK_APP_ID'),
                'client_secret'     => env('SSM_FACEBOOK_APP_SECRET'),
                'fb_exchange_token' => $shortToken,
            ]);

            if ($longTokenResponse->failed()) {
                throw new \Exception($longTokenResponse->json('error.message'));
            }

            $longToken = $longTokenResponse->json('access_token');

            //当前时间加60天
            $expiresAt = Carbon::now()->addDays(60)->format('Y-m-d H:i:s');

            // 获取用户信息
            $userInfo = $this->getFacebookUser($longToken);
            if (!$userInfo['status']) {
                return $userInfo;
            }

            return [
                'status' => true,
                'data' => [
                    'accessToken' => $longToken,
                    'accessToken_expiresAt' => $expiresAt,
                    'userName' => $userInfo['data']['name'],
                    'userId' => $userInfo['data']['id']
                ]
            ];

        } catch (\Exception $e) {
            return ['status' => false, 'data' => $e->getMessage()];
        }
    }

    public function postImage($message, $imagePaths, $accessToken)
    {
        try {
            $pagesInfo = $this->getAccountsInfo($accessToken);
            if (!$pagesInfo['status']) {
                return $pagesInfo;
            }
            $results = [];
            foreach ($pagesInfo['data'] as $page) {
                $mediaIds = [];
                foreach ($imagePaths as $imagePath) {
                    // 上传图片
                    $uploadResponse = Http::withToken($page['pageAccessToken'])
                        ->attach('source', file_get_contents($imagePath), basename($imagePath))
                        ->post("https://graph.facebook.com/{$this->graphVersion}/{$page['id']}/photos", [
                            'published' => false,
                        ]);
                    if ($uploadResponse->failed()) {
                        return ['status' => false, 'data' => $uploadResponse->json('error.message')];
                    }
                    $mediaIds[] = ['media_fbid' => $uploadResponse->json('id')];
                }

                // 发布帖子
                $postResponse = Http::withToken($page['pageAccessToken'])
                    ->post("https://graph.facebook.com/{$this->graphVersion}/{$page['id']}/feed", [
                        'message'         => $message,
                        'attached_media'  => json_encode($mediaIds),
                    ]);

                if ($postResponse->failed()) {
                    return ['status' => false, 'data' => $postResponse->json('error.message')];
                }

                $results[] = $postResponse->json('id');
            }

            return ['status' => true,
                'data' => [
                    'responseIds' => $results,
                ]];

        } catch (\Exception $e) {
            return ['status' => false, 'data' => $e->getMessage()];
        }
    }

    public function postVideo($message, $videoPath, $accessToken)
    {
        try {
            $pagesInfo = $this->getAccountsInfo($accessToken);
            if (!$pagesInfo['status']) {
                return $pagesInfo;
            }
            $results = [];
            foreach ($pagesInfo['data'] as $page) {
                $response = Http::withToken($page['pageAccessToken'])
                    ->attach('source', file_get_contents($videoPath), basename($videoPath))
                    ->post("https://graph.facebook.com/{$this->graphVersion}/{$page['id']}/videos", [
                        'description' => $message,
                    ]);

                if ($response->failed()) {
                    throw new \Exception($response->json('error.message'));
                }
                $results[] = $response->json('id');
            }
            return ['status' => true,
                'data' => [
                    'responseIds' => $results,
                ]];

        } catch (\Exception $e) {
            return ['status' => false, 'data' => $e->getMessage()];
        }
    }

    private function getFacebookUser($accessToken)
    {
        try {
            $response = Http::withToken($accessToken)
                ->get("https://graph.facebook.com/{$this->graphVersion}/me", [
                    'fields' => 'name,id'
                ]);

            if ($response->failed()) {
                throw new \Exception($response->json('error.message'));
            }

            return [
                'status' => true,
                'data' => $response->json()
            ];

        } catch (\Exception $e) {
            return ['status' => false, 'data' => $e->getMessage()];
        }
    }

    public function getAccountsInfo($accessToken)
    {
        try {
            $response = Http::withToken($accessToken)
                ->get("https://graph.facebook.com/{$this->graphVersion}/me/accounts");

            if ($response->failed()) {
                throw new \Exception($response->json('error.message'));
            }

            $pages = collect($response->json('data'))->map(function ($page) {
                return [
                    'id' => $page['id'],
                    'name' => $page['name'],
                    'pageAccessToken' => $page['access_token'],
                ];
            })->toArray();

            if (empty($pages)) {
                throw new \Exception('No pages found');
            }

            return ['status' => true, 'data' => $pages];

        } catch (\Exception $e) {
            return ['status' => false, 'data' => $e->getMessage()];
        }
    }

    // 其他接口方法保持空实现
    public function getComments($postId) {}
    public function replyToComment($commentId) {}
    public function deleteComment($commentId) {}
}