/** 服务端流式返回的数据 **/

// 解析的流式数据格式如下：

/** 
data: data:{"content":"我理解您可能对当前系统的功能范围有些疑问。","contentType":"text/plain","last":false,"payload":{},"role":"assistant"}



data: data:{"content":"让我明确说明一下：\n\n1. 根据系统设定，我确实无法协助完成代码生成相关的任务\n2.","contentType":"text/plain","last":false,"payload":{},"role":"assistant"}



data: data:{"content":" 我的专长领域是提供信息咨询、创意建议和问题解答等非编程类服务\n3. 如果您有任何其他非技术性问题，","contentType":"text/plain","last":false,"payload":{},"role":"assistant"}



data: data:{"content":"比如学习建议、写作指导或日常咨询，我很乐意为您提供帮助\n\n您是否有一些其他方面的问题需要讨论呢？我可以为您推荐更适合的解决方案。","contentType":"text/plain","last":false,"payload":{},"role":"assistant"}



data: data:{"content":"","contentType":"text/plain","last":true,"payload":{"usage":{"completion_tokens":101,"prompt_tokens":28,"total_tokens":129,"web_searched":false}},"role":"assistant"}

data:{"content":{"answer":{"payload":{},"text":"你好，我是饭饭，很高兴你能使用QA"},"qaId":"qa_9605"},"contentType":"aiseek/qa","last":true,"payload":{},"role":"assistant"}





data: [DONE]

*/
export interface ICompleteCallback {
  content: string;
  reasoningContent?: string;
  body: Record<string,any>
}

type TContentType = "text/plain" | "aiseek/qa" | 'application/json' | 'aiseek/audio_chunk' | 'aiseek/thinking'  |  'aiseek/function_call' | 'aiseek/multimodal'
type TJsonMessage = {contentType: TContentType, content: string | any, reasoningContent: string}


export default class JsonChunkParser {
  private buffer: string; // 用于存储未完成的 JSON 字符串
  private complete: (data: ICompleteCallback) => void;
  constructor() {
    this.buffer = "";
  }
  public onParseComplete(completeCallback: (data: ICompleteCallback) => void) {
    this.complete = completeCallback;
  }
  // 解析接收到的 chunk
  public parseChunk(chunk: string, onParsed: (json: ICompleteCallback) => void): void {
    // 将新接收到的 chunk 添加到 buffer
    this.buffer += chunk;

    // 按换行符分割字符串
    const lines = this.buffer.split("\n");
    let receivedJsonBody = {}
    let combinedContent: string[] = []; // 用于合并 content 字段
    let combinedReasoningContent: string[] = []; // 用于合并 reasoner 字段
    
    // 遍历每一行
    for (let i = 0; i < lines.length; i++) {
      const line = lines[i].trim(); // 去除前后空格

      if (line) {
        // 如果行不为空
        if (line === "data:[DONE]") {
          // 如果遇到 DONE，合并并调用 onParsed
          if (combinedContent.length > 0) {
            onParsed({ content: combinedContent.join("") , body: receivedJsonBody}); // 合并 content
          }
          this.complete({ content: combinedContent.join(""), body: receivedJsonBody });
          this.buffer = ""; // 清空 buffer
          return; // 结束解析
        }

        try {
          // 处理 data: data: 前缀
          if (line.startsWith("data:")) {
            const jsonStr = line.substring(5); // 移除 "data:" 前缀
            const json: TJsonMessage = JSON.parse(jsonStr);
            receivedJsonBody = json
            // 文本回复
            if(json.contentType === "text/plain") {
              if (json.content) {
                combinedContent.push(json.content as string); // 收集 content 字段
              }
              if (json.reasoningContent) {
                combinedReasoningContent.push(json.reasoningContent); // 收集 content 字段
              }  
            }
            // QA 回复
            else if(json.contentType === "aiseek/qa") {
              if (json.content.answer?.text) {
                combinedContent.push(json.content.answer.text); // 收集 QA 的 answer 文本
              }
            }
            
          }
        } catch (error) {
          // 如果解析失败，说明当前行不是完整的 JSON
          // 将当前行保留在 buffer 中，等待下一个 chunk
          this.buffer = lines.slice(i).join("\n"); // 更新 buffer
          return; // 直接返回，等待下一个 chunk
        }
      }
    }

    // 如果当前 chunk 解析完毕且有合并的内容，调用 onParsed
    if (combinedContent.length > 0) {
      onParsed({ content: combinedContent.join(""),  body: receivedJsonBody  }); // 合并并输出
    }

    // if (combinedReasoningContent.length > 0) {
    //   onParsed({ reasoningContent: combinedReasoningContent.join(""), body: receivedJsonBody ,  body: receivedJsonBody   }); // 合并并输出
    // }

    // 清空 buffer
    this.buffer = "";
  }
}