const fs = require('fs');
const path = require('path');

let mergeTrack = {
	sourcePath: __dirname + '/' + process.argv[2],
	destPath: __dirname + '/' + process.argv[3],
	
	start() {
		let jsonData = {};
		jsonData.allInOneStr = '{';
		this.traversalDir(this.sourcePath, jsonData);
		let basic = jsonData.allInOneStr.substring(0, jsonData.allInOneStr.lastIndexOf(','));
		basic += '}'
		basic = basic.replace(/\\/g,"");//去掉空格

		fs.writeFile(this.destPath, basic, (err) => {
			if (err) {
				console.error(err);
				return;
			}
			console.log('Success to write file: ' +this.destPath);
		});
	},

		//遍历文件夹找到
	traversalDir(url, content) {
		let files = [];
		if( fs.existsSync(url) ) {    //判断给定的路径是否存在
			files = fs.readdirSync(url);    //返回文件和子目录的数组
			files.forEach(function(file,index){
				let curPath = path.join(url,file);

				if(fs.statSync(curPath).isDirectory()) { //同步读取文件夹文件，如果是文件夹，则函数回调
					this.traversalDir(curPath,name,callBack);
				} else {
					let extrName = path.extname(curPath);
					let baseName = path.basename(curPath,'.json');
					let names = baseName.split('_');
					if ( extrName === '.json' && baseName != 'path' ) {
						let childStr = '"'+ names[names.length-1] +'"' + ":" + fs.readFileSync(curPath) + ',';
						content.allInOneStr += childStr;
					}
				}  
			}.bind(this));
		} else {
			console.log("给定的路径不存在！",url);
		}
		return files;
	},
};

module.exports = mergeTrack;

mergeTrack.start();