import * as xlsx from 'xlsx'
import type { WorkBook } from 'xlsx'
import type { AoAToSheet, JsonToSheet } from './typing'

const { utils, writeFile } = xlsx

const DEF_FILE_NAME = 'excel-list.xlsx'

/**
 * @param data source data
 * @param worksheet worksheet object
 * @param min min width
 */
function setColumnWidth(data, worksheet, min = 3) {
    const obj = {}
    worksheet['!cols'] = []
    data.forEach((item) => {
        Object.keys(item).forEach((key) => {
            const cur = item[key]
            const length = cur?.length ?? min
            obj[key] = Math.max(length, obj[key] ?? min)
        })
    })
    Object.keys(obj).forEach((key) => {
        worksheet['!cols'].push({
            wch: obj[key],
        })
    })
}

export function jsonToSheetXlsx<T = any>({
    data,
    header,
    filename = DEF_FILE_NAME,
    json2sheetOpts = {},
    write2excelOpts = { bookType: 'xlsx' },
}: JsonToSheet<T>) {
    const arrData = [...data]
    if (header) {
        arrData.unshift(header)
        json2sheetOpts.skipHeader = true
    }

    const worksheet = utils.json_to_sheet(arrData, json2sheetOpts)
    setColumnWidth(arrData, worksheet)
    /* add worksheet to workbook */
    const workbook: WorkBook = {
        SheetNames: [filename],
        Sheets: {
            [filename]: worksheet,
        },
    }
    /* output format determined by filename */
    writeFile(workbook, filename, write2excelOpts)
    /* at this point, out.xlsb will have been downloaded */
}

export function aoaToSheetXlsx<T = any>({
    data,
    header,
    filename = DEF_FILE_NAME,
    write2excelOpts = { bookType: 'xlsx' },
}: AoAToSheet<T>) {
    const arrData = [...data]
    if (header) {
        arrData.unshift(header)
    }

    const worksheet = utils.aoa_to_sheet(arrData)

    /* add worksheet to workbook */
    const workbook: WorkBook = {
        SheetNames: [filename],
        Sheets: {
            [filename]: worksheet,
        },
    }
    /* output format determined by filename */
    writeFile(workbook, filename, write2excelOpts)
    /* at this point, out.xlsb will have been downloaded */
}
