<?php

namespace addon\aikefu\api\controller;

use addon\aikefu\model\Config as KefuConfigModel;
use addon\aikefu\model\Conversation as KefuConversationModel;
use addon\aikefu\model\Message as KefuMessageModel;
use app\api\controller\BaseApi;


class Kefu extends BaseApi
{
    /**
     * 封装curl请求方法
     * @param string $url 请求URL
     * @param string $method 请求方法
     * @param array $data 请求数据
     * @param array $headers 请求头
     * @return string 响应内容
     */
    private function curlRequest($url, $method = 'GET', $data = [], $headers = [])
    {
        $ch = curl_init();
        
        // 设置URL
        curl_setopt($ch, CURLOPT_URL, $url);
        
        // 设置请求方法
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
        
        // 设置POST数据
        if ($method === 'POST' && !empty($data)) {
            curl_setopt($ch, CURLOPT_POSTFIELDS, is_array($data) ? json_encode($data) : $data);
        }
        
        // 设置请求头
        if (!empty($headers)) {
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        }
        
        // 设置返回值
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        
        // 执行请求
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        
        // 关闭连接
        curl_close($ch);
        
        if ($response === false) {
            throw new \Exception('Curl请求失败');
        }
        
        if ($httpCode >= 400) {
            throw new \Exception('HTTP请求失败，状态码：' . $httpCode);
        }
        
        return $response;
    }
    /**
     * 为事件调用初始化属性
     * @param array $data 事件数据
     */
    public function initializeForEvent($data)
    {
        if (!empty($data['site_id'])) {
            $this->site_id = $data['site_id'] ?? 0;
        }

        if (!empty($data['member_id'])) {
            $this->member_id = $data['member_id'] ?? 0;
        }

        if (!empty($data['token'])) {
            $this->token = $data['token'] ?? '';
        }

        $this->params = [
            'message' => $data['message'] ?? '',
            'user_id' => $data['user_id'] ?? '',
            'conversation_id' => $data['conversation_id'] ?? '',
            'stream' => $data['stream'] ?? false,
        ];
    }

    /**
     * 智能客服聊天接口
     * @return \think\response\Json
     */
    public function chat()
    {
        // 获取请求参数
        $message = $this->params['message'] ?? '';
        $user_id = $this->params['user_id'] ?? $this->member_id;
        $conversation_id = $this->params['conversation_id'] ?? '';
        $stream = $this->params['stream'] ?? false;

        // 验证参数
        if (empty($message)) {
            return $this->response($this->error('请输入消息内容'));
        }

        try {
            // 获取智能客服配置
            $kefu_config_model = new KefuConfigModel();
            $config_info = $kefu_config_model->getConfig($this->site_id)['data']['value'] ?? [];

            if (empty($config_info) || $config_info['status'] != 1) {
                return $this->response($this->error('智能客服暂未启用'));
            }

            $config = $config_info;
            $apiKey = $config['api_key'];
            $baseUrl = $config['base_url'];
            $chatEndpoint = $config['chat_endpoint'];

            // 构建请求数据
            $requestData = [
                'inputs' => [],
                'query' => $message,
                'response_mode' => $stream ? 'streaming' : 'blocking',
                'user' => $user_id,
            ];

            // 如果有会话ID，添加到请求中
            if (!empty($conversation_id)) {
                $requestData['conversation_id'] = $conversation_id;
            }

            // 构建请求头
            $headers = [
                'Authorization: Bearer ' . $apiKey,
                'Content-Type: application/json',
            ];

            // 发送请求到Dify API
            $url = $baseUrl . $chatEndpoint;
            $response = $this->curlRequest($url, 'POST', $requestData, $headers);

            // 解析响应
            $result = json_decode($response, true);

            if (json_last_error() !== JSON_ERROR_NONE) {
                return $this->response($this->error('解析响应失败'));
            }

            // 保存消息记录
            $kefu_message_model = new KefuMessageModel();
            $kefu_conversation_model = new KefuConversationModel();

            // 保存用户消息
            $kefu_message_model->addMessage([
                'site_id' => $this->site_id,
                'user_id' => $user_id,
                'conversation_id' => $result['conversation_id'] ?? $conversation_id,
                'message_id' => $result['message_id'] ?? '',
                'role' => 'user',
                'content' => $message,
            ]);

            // 保存机器人回复
            $kefu_message_model->addMessage([
                'site_id' => $this->site_id,
                'user_id' => $user_id,
                'conversation_id' => $result['conversation_id'] ?? $conversation_id,
                'message_id' => $result['id'] ?? '',
                'role' => 'assistant',
                'content' => $result['answer'] ?? '',
            ]);

            // 更新会话状态或创建新会话
            $conversation_info = $kefu_conversation_model->getConversationInfo([
                ['site_id', '=', $this->site_id],
                ['conversation_id', '=', $result['conversation_id'] ?? $conversation_id],
            ]);

            if (empty($conversation_info['data'])) {
                // 创建新会话
                $kefu_conversation_model->addConversation([
                    'site_id' => $this->site_id,
                    'user_id' => $user_id,
                    'conversation_id' => $result['conversation_id'] ?? '',
                    'name' => '智能客服会话',
                ]);
            } else {
                // 更新会话状态
                $kefu_conversation_model->updateConversation([
                    'status' => 1,
                ], [
                    ['id', '=', $conversation_info['data']['id']],
                ]);
            }

            // 返回成功响应
            return $this->response($this->success([
                'conversation_id' => $result['conversation_id'] ?? '',
                'reply' => $result['answer'] ?? '',
                'message_id' => $result['message_id'] ?? '',
                'finish_reason' => $result['finish_reason'] ?? '',
                'usage' => $result['usage'] ?? [],
            ]));
        } catch (\Exception $e) {
            return $this->response($this->error('请求失败：' . $e->getMessage()));
        }
    }

    /**
     * 获取会话历史
     * @return \think\response\Json
     */
    public function getHistory()
    {
        // 获取请求参数
        $conversation_id = $this->params['conversation_id'] ?? '';
        $user_id = $this->params['user_id'] ?? $this->member_id;
        $limit = $this->params['limit'] ?? 20;
        $offset = $this->params['offset'] ?? 0;

        // 验证参数
        if (empty($conversation_id)) {
            return $this->response($this->error('会话ID不能为空'));
        }

        try {
            // 获取会话历史记录
            $kefu_message_model = new KefuMessageModel();
            $message_list = $kefu_message_model->getMessageList([
                ['site_id', '=', $this->site_id],
                ['user_id', '=', $user_id],
                ['conversation_id', '=', $conversation_id],
            ], 'id, role, content, create_time', 'create_time asc', $limit, $offset);

            // 返回成功响应
            return $this->response($this->success([
                'messages' => $message_list['data'] ?? [],
                'total' => $message_list['total'] ?? 0,
                'limit' => $limit,
                'offset' => $offset,
            ]));
        } catch (\Exception $e) {
            return $this->response($this->error('请求失败：' . $e->getMessage()));
        }
    }

    /**
     * 创建新会话
     * @return \think\response\Json
     */
    public function createConversation()
    {
        // 获取请求参数
        $user_id = $this->params['user_id'] ?? $this->member_id;

        try {
            // 获取智能客服配置
            $kefu_config_model = new KefuConfigModel();
            $config_info = $kefu_config_model->getConfig($this->site_id)['data']['value'] ?? [];

            if (empty($config_info) || $config_info['status'] != 1) {
                return $this->response($this->error('智能客服暂未启用'));
            }

            $config = $config_info;
            $apiKey = $config['api_key'];
            $baseUrl = $config['base_url'];

            // 构建请求数据
            $requestData = [
                'name' => '智能客服会话',
                'user' => $user_id,
            ];

            // 构建请求头
            $headers = [
                'Authorization: Bearer ' . $apiKey,
                'Content-Type: application/json',
            ];

            // 发送请求到Dify API
            $url = $baseUrl . '/conversations';
            $response = $this->curlRequest($url, 'POST', $requestData, $headers);

            // 解析响应
            $result = json_decode($response, true);

            if (json_last_error() !== JSON_ERROR_NONE) {
                return $this->response($this->error('解析响应失败'));
            }

            // 保存会话记录
            $kefu_conversation_model = new KefuConversationModel();
            $kefu_conversation_model->addConversation([
                'site_id' => $this->site_id,
                'user_id' => $user_id,
                'conversation_id' => $result['id'] ?? '',
                'name' => $result['name'] ?? '智能客服会话',
            ]);

            // 返回成功响应
            return $this->response($this->success([
                'conversation_id' => $result['id'] ?? '',
                'name' => $result['name'] ?? '',
                'created_at' => $result['created_at'] ?? '',
            ]));
        } catch (\Exception $e) {
            return $this->response($this->error('请求失败：' . $e->getMessage()));
        }
    }
}