const { createReadStream } = require('fs')

class ReadApiList {
  textArr = [];
  status = false;
  lineBuffer = [];
  lineLength = 0;
  stream = null

  constructor(path) {
    this.stream = createReadStream(path);
  }

  getFileList() {
    return new Promise((resolve, reject) => {
      this.stream.on('data', (data) => {
        for (let i = 0; i < data.length; i++) {
          const byte = data[i];
          if (byte === 10 || byte === 13) { // 处理 \n 和 \r
            if (this.lineLength > 0) {
              const line = Buffer.from(this.lineBuffer.slice(0, this.lineLength)).toString('utf8');
              const cleanedLine = line.trim().replace(/'|,/g, '');

              if (cleanedLine.includes("start -")) {
                this.status = true;
              } else if (cleanedLine.includes("end -")) {
                this.status = false;

              // 去除被注释的key代码
              } else if (this.status && !cleanedLine.includes("//")) {
                  this.textArr.push(cleanedLine);
              }
            }
            this.lineLength = 0; // 重置行缓冲区
          } else {
            if (this.lineLength >= this.lineBuffer.length) {
              this.lineBuffer.push(byte);
            } else {
              this.lineBuffer[this.lineLength] = byte;
            }
            this.lineLength++;
          }
        }
      });

      this.stream.on('end', () => {
        resolve(this.textArr);
      });

      this.stream.on('error', (err) => {
        reject(err);
      });
    })
  }
}

module.exports = ReadApiList