export interface TestMessage{
    role:string
    content:string
}

export class TestCompletion{
    token:string = "r:60abef69e7cd8181b146ceaba1fdbf02"
    messageList:any = []
    stream:boolean = true;
    constructor(messageList:any){
        this.messageList = messageList || this.messageList
    }
    async sendMessage(messageList?:null|Array<TestMessage>,onMessage?: (content: string) => void):Promise<any>{
        
        this.messageList = messageList || this.messageList
        let body = {
            "messages": this.messageList,
            "stream": this.stream,
            "model": "fmode-4.5-128k",
            "temperature": 0.5,
            "presence_penalty": 0,
            "frequency_penalty": 0,
            "token": "Bearer "+this.token
        }

        let response = await fetch("https://server.fmode.cn/api/apig/aigc/gpt/v1/chat/completions", {
            "headers": {
            },
            "body": JSON.stringify(body),
            "method": "POST",
            "mode": "cors",
            "credentials": "omit"
        });

        
        /** 单次响应 HTTP短连接请求
         {"choices":[{"finish_reason":"stop","index":0,"logprobs":null,"message":{"annotations":[],"content":"您好！我是一个人工智能助手，旨在帮助您回答问题、提供信息和解决各种问题。我可以处理许多主题，包括科技、历史、文化、语言学习等。如果您有任何具体的问题或需要了解的内容，请随时告诉我！","refusal":null,"role":"assistant"}}],"created":1751509370,"id":"chatcmpl-Bp3t41MP4pb2NR38n1ylrJw922SBZ","model":"gpt-4o-mini-2024-07-18","object":"chat.completion","system_fingerprint":"fp_efad92c60b","usage":{"completion_tokens":55,"completion_tokens_details":{"accepted_prediction_tokens":0,"audio_tokens":0,"reasoning_tokens":0,"rejected_prediction_tokens":0},"prompt_tokens":15,"prompt_tokens_details":{"audio_tokens":0,"cached_tokens":0},"total_tokens":70}}
        */
        if(this.stream == false){
            let data = await response.json()
            console.log(data)
            let lastContent = data?.choices?.[0]?.message?.content
            return lastContent
        }
        /**
         * 流式加载 HTTP Event Stream 模式 长连接获取
         */
        
        // Stream mode handling
        if (!response.body) {
            throw new Error("No response body in stream mode");
        }

        const reader = response.body.getReader();
        const decoder = new TextDecoder("utf-8");
        let accumulatedContent = "";
        try {
            while (true) {
                const { done, value } = await reader.read();
                if (done) break;

                const chunk = decoder.decode(value, { stream: true });
                const lines = chunk.split('\n').filter(line => line.trim() !== '');

                for (const line of lines) {
                    if (line.startsWith('data:') && !line.includes('[DONE]')) {
                        try {
                            const jsonStr = line.substring(5).trim();
                            const data = JSON.parse(jsonStr);
                            const content = data?.choices?.[0]?.delta?.content || '';
                            
                            if (content) {
                                accumulatedContent += content;
                                if (onMessage) {
                                    onMessage(accumulatedContent);
                                }
                            }
                        } catch (e) {
                            console.error("Error parsing stream data:", e);
                        }
                    }
                }
            }
        } finally {
            reader.releaseLock();
        }

        return accumulatedContent;
    }
}

/**
 * 使用AI生成符合指定结构的JSON数据
 * @param prompt 任务要求的整体提示词
 * @param jsonSchema 期望的JSON结构描述（用于提示词）
 * @param example 可选的JSON示例（帮助AI理解格式）
 * @param onMessage 实时生成内容回调
 * @returns 解析后的JSON对象
 */
export async function completionJSON(
    prompt:string,
  jsonSchema: string,
  example: object | null = null,
  onMessage?: (content: string) => void
): Promise<any> {
  // 1. 构建提示词
  const JsonResultParsePrompt = `请严格按照以下要求生成JSON数据：
- 数据结构要求：${jsonSchema}
- 只能返回一个完整的JSON对象 确保JSON格式正确
- 注意返回的JSON格式每个KEY都有""包裹和Value之间都有:`;
// ${example ? `2. 参考示例格式：\n${JSON.stringify(example, null, 2)}` : ''}

  // 2. 初始化消息列表
  const messages: TestMessage[] = [
    {
      role: "user",
      content: prompt+JsonResultParsePrompt
    }
  ];

  // 3. 创建TestCompletion实例
  const completion = new TestCompletion(messages);
  
  // 4. 存储累积内容和JSON对象
  let fullContent = "";
  let jsonObject: any = null;
  
  // 5. 发送请求并处理流式响应
  const result = await completion.sendMessage(null, (content) => {
    fullContent = content;
  });
  console.log("fullContent",fullContent)
  // 6. 最终JSON提取（确保获取完整内容）
  try {
    // 再次尝试从完整内容中提取JSON
      jsonObject = extractJSON(fullContent);
  } catch (e) {
    console.error("JSON解析失败:", e);
    console.log("原始内容:", fullContent);
    throw new Error("生成的响应不符合JSON格式");
  }
  
  return jsonObject;
}

function extractJSON(str:string){
  let stack = 0;
  let startIndex = -1;
  let result = null;

  for (let i = 0; i < str.length; i++) {
    if (str[i] === '{') {
      if (stack === 0) startIndex = i;
      stack++;
    } else if (str[i] === '}') {
      stack--;
      if (stack === 0 && startIndex !== -1) {
        try {
          result = JSON.parse(str.slice(startIndex, i + 1));
          break;
        } catch (e) {
          // 继续尝试下一个可能的 JSON
          startIndex = -1;
        }
      }
    }
  }
  return result;
};