import dayjs from 'dayjs'

/**
 * 构造树型结构数据
 * @param {*} data 数据源
 * @param {*} id id字段 默认 'id'
 * @param {*} parentId 父节点字段 默认 'parentId'
 * @param {*} children 孩子节点字段 默认 'children'
 */
export const handleTree = (data, id, parentId, children) => {
    if (!Array.isArray(data)) {
        console.warn('data must be an array')
        return []
    }
    const config = {
        id: id || 'id',
        parentId: parentId || 'parentId',
        childrenList: children || 'children',
    }

    const childrenListMap = {}
    const nodeIds = {}
    const tree = []

    for (const d of data) {
        const parentId = d[config.parentId]
        if (childrenListMap[parentId] == null) {
            childrenListMap[parentId] = []
        }
        nodeIds[d[config.id]] = d
        childrenListMap[parentId].push(d)
    }

    for (const d of data) {
        const parentId = d[config.parentId]
        if (nodeIds[parentId] == null) {
            tree.push(d)
        }
    }

    for (const t of tree) {
        adaptToChildrenList(t)
    }

    function adaptToChildrenList(o) {
        if (childrenListMap[o[config.id]] !== null) {
            o[config.childrenList] = childrenListMap[o[config.id]]
        }
        if (o[config.childrenList]) {
            for (const c of o[config.childrenList]) {
                adaptToChildrenList(c)
            }
        }
    }

    return tree
}

export const convertToInteger = (num) => {
    if (typeof num === 'undefined') return 0
    const parsedNumber = typeof num === 'string' ? parseFloat(num) : num
    // TODO 分转元后还有小数则四舍五入
    return Math.round(parsedNumber * 100)
}

/**
 * 将一个整数转换为分数保留两位小数
 * @param num
 */
export const formatToFraction = (num) => {
    if (typeof num === 'undefined') return '0.00'
    const parsedNumber = typeof num === 'string' ? parseFloat(num) : num
    return (parsedNumber / 100.0).toFixed(2)
}

export const floatToFixed2 = (num) => {
    let str = '0.00'
    if (typeof num === 'undefined') {
        return str
    }
    const f = formatToFraction(num)
    const decimalPart = f.toString().split('.')[1]
    const len = decimalPart ? decimalPart.length : 0
    switch (len) {
        case 0:
            str = f.toString() + '.00'
            break
        case 1:
            str = f.toString() + '0'
            break
        case 2:
            str = f.toString()
            break
    }
    return str
}

export function resetPagination(pagination) {
    pagination.list = []
    pagination.total = 0
    pagination.pageNo = 1
}

/**
 * 时间日期转换
 * @param {dayjs.ConfigType} date 当前时间，new Date() 格式
 * @param {string} format 需要转换的时间格式字符串
 * @description format 字符串随意，如 `YYYY-mm、YYYY-mm-dd`
 * @description format 季度："YYYY-mm-dd HH:MM:SS QQQQ"
 * @description format 星期："YYYY-mm-dd HH:MM:SS WWW"
 * @description format 几周："YYYY-mm-dd HH:MM:SS ZZZ"
 * @description format 季度 + 星期 + 几周："YYYY-mm-dd HH:MM:SS WWW QQQQ ZZZ"
 * @returns {string} 返回拼接后的时间字符串
 */
export function formatDate(date, format) {
    // 日期不存在，则返回空
    if (!date) {
        return ''
    }
    // 日期存在，则进行格式化
    if (format === undefined) {
        format = 'YYYY-MM-DD HH:mm:ss'
    }
    return dayjs(date).format(format)
}