import { openWindow } from '..'
import { dataURLtoBlob, urlToBase64 } from './base64Conver'

/**
 * Download online pictures
 * @param url
 * @param filename
 * @param mime
 * @param bom
 */
export function downloadByOnlineUrl(url: string, filename: string, mime?: string, bom?: BlobPart) {
    urlToBase64(url).then((base64) => {
        downloadByBase64(base64, filename, mime, bom)
    })
}

/**
 * Download pictures based on base64
 * @param buf
 * @param filename
 * @param mime
 * @param bom
 */
export function downloadByBase64(buf: string, filename: string, mime?: string, bom?: BlobPart) {
    const base64Buf = dataURLtoBlob(buf)
    downloadByData(base64Buf, filename, mime, bom)
}

/**
 * Download according to the background interface file stream
 * @param {*} data
 * @param {*} filename
 * @param {*} mime
 * @param {*} bom
 */
export function downloadByData(data: BlobPart, filename: string, mime?: string, bom?: BlobPart) {
    const blobData = typeof bom !== 'undefined' ? [bom, data] : [data]
    const blob = new Blob(blobData, { type: mime || 'application/octet-stream' })

    const blobURL = window.URL.createObjectURL(blob)
    const tempLink = document.createElement('a')
    tempLink.style.display = 'none'
    tempLink.href = blobURL
    tempLink.setAttribute('download', filename)
    if (typeof tempLink.download === 'undefined') {
        tempLink.setAttribute('target', '_blank')
    }
    document.body.appendChild(tempLink)
    tempLink.click()
    document.body.removeChild(tempLink)
    window.URL.revokeObjectURL(blobURL)
}

/**
 * Download file according to file address
 * @param {*} sUrl
 */
export function downloadByUrl({
    url,
    target = '_blank',
    fileName,
}: {
    url: string
    target?: TargetContext
    fileName?: string
}): boolean {
    const isChrome = window.navigator.userAgent.toLowerCase().includes('chrome')
    const isSafari = window.navigator.userAgent.toLowerCase().includes('safari')

    if (/(iP)/g.test(window.navigator.userAgent)) {
        console.error('Your browser does not support download!')
        return false
    }
    if (isChrome || isSafari) {
        const link = document.createElement('a')
        link.href = url
        link.target = target

        if (link.download !== undefined) {
            link.download = fileName || url.substring(url.lastIndexOf('/') + 1, url.length)
        }

        if (document.createEvent) {
            const e = document.createEvent('MouseEvents')
            e.initEvent('click', true, true)
            link.dispatchEvent(e)
            return true
        }
    }
    if (!url.includes('?')) {
        url += '?download'
    }

    openWindow(url, { target })
    return true
}
