<template>
	<view class="tui-countdown-box">
		<view class="tui-countdown-item" :style="{ background: backgroundColor, borderColor: borderColor, width: getWidth(d, width) + 'rpx', height: height + 'rpx' }" v-if="days">
			<view class="tui-countdown-time" :class="[scale ? 'tui-countdown-scale' : '']" :style="{ fontSize: size + 'rpx', color: color, lineHeight: height + 'rpx' }">
				{{ d }}
			</view>
		</view>
		<view
			class="tui-countdown-colon"
			:class="{ 'tui-colon-pad': borderColor == 'transparent' }"
			:style="{ fontSize: colonSize + 'rpx', color: colonColor }"
			v-if="days"
		>
			{{ isColon ? ':' : '天' }}
		</view>
		<view class="tui-countdown-item" :style="{ background: backgroundColor, borderColor: borderColor, width: getWidth(h, width) + 'rpx', height: height + 'rpx' }" v-if="hours">
			<view class="tui-countdown-time" :class="[scale ? 'tui-countdown-scale' : '']" :style="{ fontSize: size + 'rpx', color: color, lineHeight: height + 'rpx' }">
				{{ h }}
			</view>
		</view>
		<view
			class="tui-countdown-colon"
			:class="{ 'tui-colon-pad': borderColor == 'transparent' }"
			:style="{ fontSize: colonSize + 'rpx', color: colonColor }"
			v-if="hours"
		>
			{{ isColon ? ':' : '时' }}
		</view>
		<view
			class="tui-countdown-item"
			:style="{ background: backgroundColor, borderColor: borderColor, width: getWidth(i, width) + 'rpx', height: height + 'rpx' }"
			v-if="minutes"
		>
			<view class="tui-countdown-time" :class="[scale ? 'tui-countdown-scale' : '']" :style="{ fontSize: size + 'rpx', color: color, lineHeight: height + 'rpx' }">
				{{ i }}
			</view>
		</view>
		<view
			class="tui-countdown-colon"
			:class="{ 'tui-colon-pad': borderColor == 'transparent' }"
			:style="{  fontSize: colonSize + 'rpx', color: colonColor }"
			v-if="minutes"
		>
			{{ isColon ? ':' : '分' }}
		</view>
		<view
			class="tui-countdown-item"
			:style="{ background: backgroundColor, borderColor: borderColor, width: getWidth(s, width) + 'rpx', height: height + 'rpx' }"
			v-if="seconds"
		>
			<view class="tui-countdown-time" :class="[scale ? 'tui-countdown-scale' : '']" :style="{ fontSize: size + 'rpx', color: color, lineHeight: height + 'rpx' }">
				{{ s }}
			</view>
		</view>
		<view
			class="tui-countdown-colon"
			:class="{ 'tui-colon-pad': borderColor == 'transparent' }"
			:style="{  fontSize: colonSize + 'rpx', color: colonColor }"
			v-if="seconds && !isColon"
		>
			{{ unitEn ? 's' : '秒' }}
		</view>

		<view class="tui-countdown-colon" :style="{ lineHeight: colonSize + 'rpx', fontSize: colonSize + 'rpx', color: colonColor }" v-if="seconds && isMs && isColon">.</view>
		<view
			class="tui-countdown__ms"
			:style="{
				background: backgroundColor,
				borderColor: borderColor,
				fontSize: msSize + 'rpx',
				color: msColor,
				height: height + 'rpx',
				width: msWidth > 0 ? msWidth + 'rpx' : 'auto'
			}"
			v-if="seconds && isMs"
		>
			<view :class="{ 'tui-ms__list': ani }">
				<view class="tui-ms__item" :style="{ height: height + 'rpx' }" v-for="(item, index) in ms" :key="index">
					<view :class="[scale ? 'tui-countdown-scale' : '']">{{item}}</view>
				</view>
			</view>
		</view>
	</view>
</template>

<script>
export default {
	name: 'tuiCountdown',
	props: {
		//数字框宽度
		width: {
			type: Number,
			default: 32
		},
		//数字框高度
		height: {
			type: Number,
			default: 32
		},
		//数字框border颜色
		borderColor: {
			type: String,
			default: '#333'
		},
		//数字框背景颜色
		backgroundColor: {
			type: String,
			default: '#fff'
		},
		//数字框字体大小
		size: {
			type: Number,
			default: 24
		},
		//数字框字体颜色
		color: {
			type: String,
			default: '#333'
		},
		//是否缩放 0.9
		scale: {
			type: Boolean,
			default: false
		},
		//冒号大小
		colonSize: {
			type: Number,
			default: 28
		},
		//冒号颜色
		colonColor: {
			type: String,
			default: '#333'
		},
		//剩余时间 (单位：秒)
		time: {
			type: Number,
			default: 0
		},
		//是否包含天
		days: {
			type: Boolean,
			default: false
		},
		//是否包含小时
		hours: {
			type: Boolean,
			default: true
		},
		//是否包含分钟
		minutes: {
			type: Boolean,
			default: true
		},
		//是否包含秒
		seconds: {
			type: Boolean,
			default: true
		},
		//单位用英文缩写表示 仅seconds秒数有效
		unitEn: {
			type: Boolean,
			default: false
		},
		//是否展示为冒号,false为文字
		isColon: {
			type: Boolean,
			default: true
		},
		//是否返回剩余时间
		returnTime: {
			type: Boolean,
			default: false
		},
		//是否显示毫秒
		isMs: {
			type: Boolean,
			default: false
		},
		msWidth: {
			type: Number,
			default: 32
		},
		msSize: {
			type: Number,
			default: 24
		},
		msColor: {
			type: String,
			default: '#333'
		}
	},
	watch: {
		time(val) {
			this.clearTimer();
			this.doLoop();
		}
	},
	data() {
		return {
			countdown: null,
			d: '0',
			h: '00',
			i: '00',
			s: '00',
			//此处若从9到1，结束需要特殊处理
			ms: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
			ani: false
		};
	},
	created() {
		this.clearTimer();
		this.doLoop();
	},
	beforeDestroy() {
		this.clearTimer();
	},
	methods: {
		getWidth: function(num, width) {
			return num > 99 ? (width / 2) * num.toString().length : width;
		},
		clearTimer() {
			clearInterval(this.countdown);
			this.countdown = null;
		},
		endOfTime() {
			this.ani = false;
			this.clearTimer();
			this.$emit('end', {});
		},
		doLoop: function() {
			let seconds = this.time || 0;
			this.ani = true;
			this.countDown(seconds);
			this.countdown = setInterval(() => {
				seconds--;
				if (seconds < 0) {
					this.endOfTime();
					return;
				}
				this.countDown(seconds);
				if (this.returnTime) {
					this.$emit('time', { seconds: seconds });
				}
			}, 1000);
		},
		countDown(seconds) {
			let [day, hour, minute, second] = [0, 0, 0, 0];
			if (seconds > 0) {
				day = this.days ? Math.floor(seconds / (60 * 60 * 24)) : 0;
				hour = this.hours ? Math.floor(seconds / (60 * 60)) - day * 24 : 0;
				minute = this.minutes ? Math.floor(seconds / 60) - hour * 60 - day * 24 * 60 : 0;
				second = Math.floor(seconds) - day * 24 * 60 * 60 - hour * 60 * 60 - minute * 60;
			} else {
				this.endOfTime();
			}
			hour = hour < 10 ? '0' + hour : hour;
			minute = minute < 10 ? '0' + minute : minute;
			second = second < 10 ? '0' + second : second;
			this.d = day;
			this.h = hour;
			this.i = minute;
			this.s = second;
		}
	}
};
</script>

<style scoped>
.tui-countdown-box {
	display: flex;
	align-items: center;
}

.tui-countdown-box {
	display: flex;
	align-items: center;
}

.tui-countdown-item {
	border: 1rpx solid;
	display: flex;
	align-items: center;
	justify-content: center;
	border-radius: 6rpx;
	white-space: nowrap;
	transform: translateZ(0);
}

.tui-countdown-time {
	margin: 0;
	padding: 0;
}

.tui-countdown-colon {
	display: flex;
	justify-content: center;
	padding: 0 5rpx;
}

.tui-colon-pad {
	padding: 0 !important;
}

.tui-countdown-scale {
	transform: scale(0.9);
	transform-origin: center center;
}
.tui-countdown__ms {
	border: 1rpx solid;
	overflow: hidden;
	border-radius: 6rpx;
}

/*ms使用css3代替js频繁更新操作，性能优化*/
.tui-ms__list {
	animation: loop 1s steps(10) infinite;
}

@keyframes loop {
	from {
		transform: translateY(0);
	}

	to {
		transform: translateY(-100%);
	}
}

.tui-ms__item {
	display: flex;
	align-items: center;
	justify-content: center;
}
</style>