import fetch from 'node-fetch'

export class calc extends plugin {
    constructor() {
        super({
            /** 功能名称 */
            name: '计算器',
            /** 功能描述 */
            dsc: '加减乘除计算器',
            /** https://oicqjs.github.io/oicq/#events */
            event: 'message',
            /** 优先级，数字越小等级越高 */
            priority: 1000,
            rule: [
                {
                    /** 命令正则匹配 */
                    reg: '^[0-9\(\)\（\）\%]+(:?[\\+\\-\\*\\x\\/\\÷\(\)\（\）\.][0-9\(\)\（\）\%]+)+$',
                    /** 执行方法 */
                    fnc: 'calc'
                }
            ]
        })
    }

    /**
     * 
     * @param e oicq传递的事件参数e
     */
    async calc(e) {
        let emsg = this.e.msg.replace(/#|＃|计算|=/g, "");
        var regk = /[\（]/g, regk2 = /[\）]/g;
        emsg = emsg.replace(regk, "(").replace(regk2, ")").replace("%", "/100").replace("÷", "/").replace("x", "*").replace(/“|”/g, "\"");
        let res;
        try {
            if (!emsg.match(/[a-zA-Z]/g) || this.e.isMaster) {
                if (!emsg.match(/[\(\)\*\/]/g)) {
                    res = jisuan(emsg);
                } else {
                    res = await eval(emsg);
                }
                
            } else {
                this.e.reply("含有非法字符，无法计算");
                return true;
            }

        } catch (errorall) {
            this.e.reply(errorall.toString());
            return true;
        }
        if (res == emsg) {
            return true;
        }

        await this.e.reply(`计算结果：${JSON.stringify(res)}`);

        return true; //返回true 阻挡消息不再往下
    }


    
}

function jisuan(emsg) {
    var preNum = "";
    var nextNum = "";
    var str = "";
    for (let i = 0; i < emsg.length; i++) {
        if (emsg[i] != "+" && emsg[i] != "-" ) {
            nextNum = nextNum + "" + emsg[i];
        } else if (preNum != "") {
            if (str == "+" ) {
                preNum = accAdd(preNum,nextNum);
            } else {
                preNum = accSub(preNum,nextNum);
            }
            str = emsg[i];
            nextNum = "";
        } else {
            var preNum = nextNum;
            var nextNum = "";
            str = emsg[i];
        }
        console.log(preNum + " " + nextNum + " " + str);
    }
    if (preNum == "") {
        console.log(preNum + " " + nextNum + " " + str);
        preNum=nextNum;
    } else {
        if (str == "+" ) {
            preNum = accAdd(preNum,nextNum);
        } else {
            preNum = accSub(preNum,nextNum);
        }
    }
    return preNum;
}


/**
 * 数字相加
 * @param {*} arg1 
 * @param {*} arg2 
 * @returns 
 */
 function accAdd(arg1, arg2) {
    return changeNum(arg1, arg2)
}

/**
 * 数字相减
 * @param {*} arg1 
 * @param {*} arg2 
 * @returns 
 */
function accSub(arg1, arg2) {
	return changeNum(arg1, arg2, false)
}

/**
 * 数字相乘
 * @param {*} arg1 
 * @param {*} arg2 
 * @returns 
 */
function accMul(arg1, arg2) {
	let m = 0;
	m = accAdd(m, getDecimalLength(arg1))
	m = accAdd(m, getDecimalLength(arg2))
	return getNum(arg1) * getNum(arg2) / Math.pow(10, m)
}

/**
 * 数字相除
 * @param {*} arg1 
 * @param {*} arg2 
 * @returns 
 */
function accDiv(arg1, arg2) {
	let t1, t2;
	t1 = getDecimalLength(arg1)
	t2 = getDecimalLength(arg2)
    if(t1 - t2 > 0) {
        return (getNum(arg1) / getNum(arg2)) / Math.pow(10, t1 - t2)
    } else {
        return (getNum(arg1) / getNum(arg2)) * Math.pow(10, t2 - t1)
    }
}

function changeNum(arg1 = '', arg2 = '', isAdd = true){
    function changeInteger(arg, r, maxR){
        if(r != maxR){
            let addZero = ''
            for(let i = 0; i < maxR - r; i++){
                addZero += '0'
            }
            arg = Number(arg.toString().replace('.', '') + addZero)
        }else{
            arg = getNum(arg)
        }
        return arg
    }
    let r1, r2, maxR, m;
    r1 = getDecimalLength(arg1)
    r2 = getDecimalLength(arg2)
    maxR = Math.max(r1, r2)
    arg1 = changeInteger(arg1, r1, maxR)
    arg2 = changeInteger(arg2, r2, maxR)
    m = Math.pow(10, maxR)
    if(isAdd){
        return (arg1 + arg2) / m
    }else{
        return (arg1 - arg2) / m
    }
}

function getDecimalLength(arg = ''){
    try {
        return arg.toString().split(".")[1].length
    } catch (e) {
        return 0
    }
}

function getNum(arg = ''){
    return Number(arg.toString().replace(".", ""))
}