<?php

namespace App\Services;

use App\Models\SystemConfig;
use App\Models\User;
use Illuminate\Support\Facades\Cache;

class WeChatPlatformService
{
    /**
     * 获取微信开放平台配置
     */
    public function getConfig(): array
    {
        $cacheKey = 'wechat_platform_config';

        return Cache::remember($cacheKey, 3600, function () {
            return [
                'enabled' => SystemConfig::getValue('wechat', 'enabled', false),
                'app_id' => SystemConfig::getValue('wechat', 'app_id', ''),
                'app_secret' => SystemConfig::getValue('wechat', 'app_secret', ''),
                'token' => SystemConfig::getValue('wechat', 'token', ''),
                'encoding_aes_key' => SystemConfig::getValue('wechat', 'encoding_aes_key', ''),
            ];
        });
    }

    /**
     * 小程序登录
     */
    public function miniProgramLogin(string $code): array
    {
        $config = $this->getConfig();

        if (!$config['enabled']) {
            return ['success' => false, 'message' => '微信服务未启用'];
        }

        try {
            $response = \Illuminate\Support\Facades\Http::get('https://api.weixin.qq.com/sns/jscode2session', [
                'appid' => $config['app_id'],
                'secret' => $config['app_secret'],
                'js_code' => $code,
                'grant_type' => 'authorization_code',
            ]);

            $data = $response->json();

            if (isset($data['errcode']) && $data['errcode'] !== 0) {
                return ['success' => false, 'message' => $data['errmsg'] ?? '微信登录失败'];
            }

            return [
                'success' => true,
                'data' => [
                    'openid' => $data['openid'],
                    'unionid' => $data['unionid'] ?? null,
                    'session_key' => $data['session_key'] ?? null,
                ],
            ];
        } catch (\Exception $e) {
            \Log::error('微信小程序登录失败: ' . $e->getMessage());
            return ['success' => false, 'message' => '微信登录失败'];
        }
    }

    /**
     * 公众号登录 - 获取授权URL
     */
    public function getOauthUrl(string $redirectUri, string $state = ''): string
    {
        $config = $this->getConfig();
        $state = $state ?: md5(uniqid());

        $params = [
            'appid' => $config['app_id'],
            'redirect_uri' => $redirectUri,
            'response_type' => 'code',
            'scope' => 'snsapi_userinfo',
            'state' => $state,
        ];

        return 'https://open.weixin.qq.com/connect/oauth2/authorize?' . http_build_query($params) . '#wechat_redirect';
    }

    /**
     * 公众号登录 - 通过code获取用户信息
     */
    public function officialAccountCallback(string $code): array
    {
        $config = $this->getConfig();

        if (!$config['enabled']) {
            return ['success' => false, 'message' => '微信服务未启用'];
        }

        try {
            // 获取 access_token
            $tokenResponse = \Illuminate\Support\Facades\Http::get('https://api.weixin.qq.com/sns/oauth2/access_token', [
                'appid' => $config['app_id'],
                'secret' => $config['app_secret'],
                'code' => $code,
                'grant_type' => 'authorization_code',
            ]);

            $tokenData = $tokenResponse->json();

            if (isset($tokenData['errcode']) && $tokenData['errcode'] !== 0) {
                return ['success' => false, 'message' => $tokenData['errmsg'] ?? '获取access_token失败'];
            }

            // 获取用户信息
            $userResponse = \Illuminate\Support\Facades\Http::get('https://api.weixin.qq.com/sns/userinfo', [
                'access_token' => $tokenData['access_token'],
                'openid' => $tokenData['openid'],
                'lang' => 'zh_CN',
            ]);

            $userData = $userResponse->json();

            return [
                'success' => true,
                'data' => [
                    'openid' => $userData['openid'],
                    'unionid' => $userData['unionid'] ?? null,
                    'nickname' => $userData['nickname'] ?? null,
                    'headimgurl' => $userData['headimgurl'] ?? null,
                    'sex' => $userData['sex'] ?? null,
                    'country' => $userData['country'] ?? null,
                    'province' => $userData['province'] ?? null,
                    'city' => $userData['city'] ?? null,
                ],
            ];
        } catch (\Exception $e) {
            \Log::error('微信公众号登录失败: ' . $e->getMessage());
            return ['success' => false, 'message' => '微信登录失败'];
        }
    }

    /**
     * 获取用户信息（通过openid）
     */
    public function getUserInfo(string $openid): ?array
    {
        $config = $this->getConfig();

        try {
            $response = \Illuminate\Support\Facades\Http::get('https://api.weixin.qq.com/cgi-bin/user/info', [
                'access_token' => $this->getComponentAccessToken(),
                'openid' => $openid,
                'lang' => 'zh_CN',
            ]);

            return $response->json();
        } catch (\Exception $e) {
            \Log::error('获取微信用户信息失败: ' . $e->getMessage());
            return null;
        }
    }

    /**
     * 获取第三方平台 component_access_token
     */
    private function getComponentAccessToken(): ?string
    {
        $cacheKey = 'wechat_component_access_token';

        $token = Cache::get($cacheKey);

        if ($token) {
            return $token;
        }

        $config = $this->getConfig();

        // 如果是第三方平台模式，需要使用 component_appid 和 component_appsecret
        // 这里简化处理，假设使用的是独立应用
        return null;
    }

    /**
     * 发送模板消息
     */
    public function sendTemplateMessage(string $openid, string $templateId, array $data, string $url = ''): bool
    {
        $config = $this->getConfig();

        if (!$config['enabled']) {
            return false;
        }

        try {
            $accessToken = $this->getComponentAccessToken();

            if (!$accessToken) {
                // 使用小程序的 access_token
                $accessToken = $this->getMiniProgramAccessToken();
            }

            $response = \Illuminate\Support\Facades\Http::post("https://api.weixin.qq.com/cgi-bin/message/template/send?access_token={$accessToken}", [
                'touser' => $openid,
                'template_id' => $templateId,
                'url' => $url,
                'data' => $data,
            ]);

            $result = $response->json();

            return ($result['errcode'] ?? 1) === 0;
        } catch (\Exception $e) {
            \Log::error('发送微信模板消息失败: ' . $e->getMessage());
            return false;
        }
    }

    /**
     * 获取小程序 access_token
     */
    private function getMiniProgramAccessToken(): ?string
    {
        $cacheKey = 'wechat_mini_program_access_token';

        $token = Cache::get($cacheKey);

        if ($token) {
            return $token;
        }

        $config = $this->getConfig();

        try {
            $response = \Illuminate\Support\Facades\Http::get('https://api.weixin.qq.com/cgi-bin/token', [
                'grant_type' => 'client_credential',
                'appid' => $config['app_id'],
                'secret' => $config['app_secret'],
            ]);

            $data = $response->json();

            if (isset($data['access_token'])) {
                Cache::put($cacheKey, $data['access_token'], now()->addSeconds($data['expires_in'] - 200));
                return $data['access_token'];
            }
        } catch (\Exception $e) {
            \Log::error('获取小程序access_token失败: ' . $e->getMessage());
        }

        return null;
    }
}