import Vue from 'vue'

export const qiniuUploadProgressState = Vue.observable({
	visible: false,
	progress: 0,
	speedText: '0KB/s',
	sizeText: '',
	title: '上传中'
})

let lastTime = 0
let lastSent = 0

export function formatFileSize(bytes) {
	const n = Number(bytes) || 0
	if (n <= 0) return '0B'
	if (n < 1024) return n + 'B'
	if (n < 1024 * 1024) return (n / 1024).toFixed(1) + 'KB'
	return (n / 1024 / 1024).toFixed(2) + 'MB'
}

export function formatSpeed(bytesPerSec) {
	const n = Number(bytesPerSec) || 0
	if (n <= 0) return '0KB/s'
	if (n < 1024) return n.toFixed(0) + 'B/s'
	if (n < 1024 * 1024) return (n / 1024).toFixed(1) + 'KB/s'
	return (n / 1024 / 1024).toFixed(2) + 'MB/s'
}

export function resetQiniuUploadProgress() {
	qiniuUploadProgressState.progress = 0
	qiniuUploadProgressState.speedText = '0KB/s'
	qiniuUploadProgressState.sizeText = ''
	lastTime = 0
	lastSent = 0
}

export function showQiniuUploadProgress(title = '上传中') {
	resetQiniuUploadProgress()
	qiniuUploadProgressState.title = title
	qiniuUploadProgressState.visible = true
}

export function hideQiniuUploadProgress() {
	qiniuUploadProgressState.visible = false
	resetQiniuUploadProgress()
}

export function updateQiniuUploadProgress(res) {
	const now = Date.now()
	const sent = res.totalBytesSent || 0
	const total = res.totalBytesExpectedToSend || 0
	qiniuUploadProgressState.progress = Math.min(100, Math.max(0, res.progress || 0))
	if (total > 0) {
		qiniuUploadProgressState.sizeText = formatFileSize(sent) + ' / ' + formatFileSize(total)
	}
	if (lastTime && now > lastTime) {
		const deltaBytes = sent - lastSent
		const deltaTime = (now - lastTime) / 1000
		if (deltaTime > 0 && deltaBytes >= 0) {
			qiniuUploadProgressState.speedText = formatSpeed(deltaBytes / deltaTime)
		}
	}
	lastTime = now
	lastSent = sent
}