/**
 * 商品条码严格按照国际通用码
 * @author tmzdy
 * @description 资料参考：https://zhuanlan.zhihu.com/p/120676811
 */
class ean13 {
	//编码数据
	data=""
	//护码
	safeCode = "101"
	middleCode = "01010"
	//编码方式，我们中国是6：LGGGLL
	EAN13_STRUCTURE = [
		'LLLLLL', 'LLGLGG', 'LLGGLG', 'LLGGGL', 'LGLLGG',
		'LGGLLG', 'LGGGLL', 'LGLGLG', 'LGLGGL', 'LGGLGL'
	];
	
	
	constructor(text:string) {
		let data = text;
		if (data.search(/^[0-9]{12}$/)!== -1  as number ) {
			data += (this.checksum(data)).toString();
		}
		this.data = data.toUpperCase();
	}
	//校验码。
	checksum(codestr:string):number{
		const res = codestr.substring(0, 12).split('')
		const resNumber = res.map((n:string):number => parseInt(n))
			
		const jg=resNumber.reduce((sum:number, a:number, idx:number):number => (idx % 2) > 0 ? sum + a * 3 : sum + a, 0);
	
		return (10 - (jg % 10)) % 10;
	}
	//按钮编码规则提取逻辑值，
	getEan13Str(key:string):string[]{
		if(key=="L") return [ 
			'0001101', '0011001', '0010011', '0111101', '0100011',
			'0110001', '0101111', '0111011', '0110111', '0001011'
		]
		if(key=="G") return [
			'0100111', '0110011', '0011011', '0100001', '0011101',
			'0111001', '0000101', '0010001', '0001001', '0010111'
		]
		if(key=="R") return [ 
			'1110010', '1100110', '1101100', '1000010', '1011100',
			'1001110', '1010000', '1000100', '1001000', '1110100'
		]
		return [] as string[];
	}
	
	encodeByGuzhe(dataStr:string, structure:string):string{
		let encoded = dataStr.split('')
		let atrartys = [] as string[][]
		for(let i=0;i<encoded.length;i++){
			let chart = structure.substring(i,i+1)
			atrartys.push(this.getEan13Str(chart))
		}
		
		let encoded_str = atrartys.map((val:string[], idx:number):string => {
			let stur = dataStr.substring(idx,idx+1)
			return val[parseInt(stur)]
		});
		
		return encoded_str.join("")
	};
	encode():string[] {
		// 取编码方式。
		let codeFang = this.EAN13_STRUCTURE[parseInt(this.data.substring(0,1))]
		//取后面的12位数字
		let data = this.data.substring(1,13)
		let leftCode = data.substring(0,6)
		let rightCode = data.substring(6,13)
		
		let left_code_str = this.encodeByGuzhe(leftCode,codeFang);
		//右资料码按规则是物料码+校验码
		let right_code_str = this.encodeByGuzhe(rightCode,"RRRRRR");
		// 组合码制
		//护码+左资料码+中间码+右资料码+护码
		// let totalcode = this.safeCode+left_code_str+this.middleCode+right_code_str+this.safeCode
		return [this.safeCode,left_code_str,this.middleCode,right_code_str,this.safeCode]
	}

	
}

export { ean13 };