// 62进制列表，按序对应10进制的0~61
let list62 = [
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
    'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
    'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D',
    'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
    'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
    'Y', 'Z'
];

// 62进制转10进制的map
let map1 = {};
// 10进制转62进制的map
let map2 = {};

for (let i = 0; i < list62.length; i++) {
    const v = list62[i];
    map1[v] = i;
    map2[i] = v;
}

let orderRandNum = 0;

module.exports = {
    // 新建32位订单
    newOrderId32 (uid, gid, channelId) {
        let date = new Date();
        let time = Math.floor(date.getTime() / 1000);

        let num = this._newOrderRandNum() % 10;
        // 订单末尾是 _1，用于表示是H5的订单。旧的APP是以_0结尾的
        // 10+1 + 1+3 + 1+9 +1+4 +2 = 32位
        let timeStr = this._numberPadding(time, 10);
        let channelStr = this._numberPadding(channelId, 3);
        let uidStr = this._numberPadding(uid, 9);
        let gidStr = this._numberPadding(gid, 4);
        let orderId = cc.js.formatStr('%s%d_%s_%s_%s_1', timeStr, num, channelStr, uidStr, gidStr);

        return orderId;
    },

    // 新增11位订单（百度专用）
    newOrderId11 (uid, gid) {
        let num = this._newOrderRandNum() % 1000;
        let orderId = this._encodeOrderId11(uid, gid, num);
        return orderId;
    },

    // 获取新的去重数
    _newOrderRandNum () {
        orderRandNum = orderRandNum + 1;
        return orderRandNum;
    },

    /* 编码11位订单id
        uid: 账号
        gid: 商品id
        randomIndex: 随机序号(3位数)
    */
    _encodeOrderId11 (uid, gid, randomIndex) {
        let orderNumber = this._numberPadding(uid, 9) +
            this._numberPadding(randomIndex, 3) +
            this._numberPadding(gid, 4);
        let orderId = this._orderNumberToId(orderNumber);
        return orderId;
    },

    /* 解码11位订单id
    返回：
        uid: 账号
        gid: 商品id
    */
    _decodeOrderId11 (orderId) {
        let orderNumber = this._orderIdToNumber(orderId);
        let uidStr = orderNumber.substring(0, 9);
        let gidStr = orderNumber.substring(12, 16);

        let ret = {
            uid: parseInt(uidStr),
            gid: parseInt(gidStr)
        };

        return ret;
    },

    // 给数字前补“0”
    _numberPadding (num, length, char = '0') {
        for (let len = (num + '').length; len < length; len++) {
            num = char + num;
        }
        return num;
    },

    // 10进制字符串转62进制字符串
    _num10To62 (num10) {
        let ret = '';

        let num = parseInt(num10);
        while (num != 0) {
            let m = num % 62;
            let c = map2[m];
            ret = c + ret;

            num = (num - m) / 62;
        }

        return ret;
    },

    // 62进制字符串转10进制字符串
    _num62To10 (num62) {
        let ret = 0;

        let j = 1;
        for (let i = num62.length - 1; i >= 0; i--) {
            let c = num62.substring(i, i + 1);
            let n = map1[c];
            ret = ret + n * j;

            j = j * 62;
        }

        return ret;
    },

    // 将订单编码转成订单id
    _orderNumberToId (orderNumber) {
        // 1~9位是9位的10进制，转成5位的62进制。不足5位时，补0凑够5位
        let str1 = orderNumber.substring(0, 9);
        let s1 = this._num10To62(str1);
        for (let i = 0; i < 5 - s1.length; i++) {
            s1 = '0' + s1;
        }

        // 10~16位是7位的10进制，转成4位的62进制。不足4位时，补0凑够4位
        let str2 = orderNumber.substring(9, 16);
        let s2 = this._num10To62(str2);
        for (let i = 0; i < 4 - s2.length; i++) {
            s2 = '0' + s2;
        }

        // 上面2段拼起来，再加SS前缀
        let orderId = 'SS' + s1 + s2;

        return orderId;
    },

    // 将订单id转成订单编码
    _orderIdToNumber (orderId) {
        // 3~7位是5位的62进制，转成9位的10进制
        let str1 = orderId.substring(2, 7);
        let num1 = this._num62To10(str1);

        // 8~11位是4位的62进制，转成7位的10进制
        let str2 = orderId.substring(7, 11);
        let num2 = this._num62To10(str2);

        // 不足位时，补0凑够位
        let ret = this._numberPadding(num1, 9) + this._numberPadding(num2, 7);

        return ret;
    },

    // 测试用例
    test () {
        let uid = 787654321;
        let gid = 9999;
        let randomIndex = 2;
        let orderId11 = this._encodeOrderId11(uid, gid, randomIndex);
        let tbl = this._decodeOrderId11(orderId11);
        console.log('source:', uid, gid, randomIndex);
        console.log('result:', orderId11);
        console.log('unresult:', tbl.uid, tbl.gid);

        let orderId22 = 'SSRiURX07NR';
        let tbl22 = this._decodeOrderId11(orderId22);
        console.log('SSRiURX07NR', tbl22.uid, tbl22.gid);
    }
};