/**
 * 时间格式化工具
 * 挂载到 uni.formatTime，支持以下格式：
 *   uni.formatTime(date, 'YYYY-MM-DD HH:mm:ss')
 *   uni.formatTime(timestamp, 'YYYY/MM/DD')
 */

const pad = (n) => String(n).padStart(2, '0')

const formatTime = (date, fmt = 'YYYY-MM-DD HH:mm:ss') => {
	if (!date) return ''
	const d = date instanceof Date ? date : new Date(date)
	if (isNaN(d.getTime())) return ''

	const tokens = {
		'Y+': d.getFullYear(),
		'M+': d.getMonth() + 1,
		'D+': d.getDate(),
		'H+': d.getHours(),
		'm+': d.getMinutes(),
		's+': d.getSeconds(),
	}

	for (const [key, val] of Object.entries(tokens)) {
		const match = fmt.match(new RegExp(key))
		if (match) {
			const len = match[0].length
			const str = key === 'Y+' ? String(val).slice(-len) : len === 1 ? String(val) : pad(val)
			fmt = fmt.replace(match[0], str)
		}
	}

	return fmt
}

uni.formatTime = formatTime

export default formatTime