<template>
	<view class="tui-timer__box">
		<view class="tui-timer__item" :style="{
				background: backgroundColor,
				border: borderWidth > 0 ? `${borderWidth}rpx solid ${borderColor}` : 0,
				width: backgroundColor == 'transparent' && borderColor == 'transparent' ? 'auto' : getWidth(d, width) + 'rpx',
				height: height + 'rpx',
				fontSize: size + 'rpx',
				color: color
			}"
		 v-if="isDays">
			{{ d }}
		</view>
		<view class="tui-timer__colon" :style="{ lineHeight: colonSize + 'rpx', fontSize: colonSize + 'rpx', color: colonColor }"
		 v-if="isDays">天</view>
		<view class="tui-timer__item" :style="{
				background: backgroundColor,
				border: borderWidth > 0 ? `${borderWidth}rpx solid ${borderColor}` : 0,
				width: getWidth(d, width) + 'rpx',
				height: height + 'rpx',
				fontSize: size + 'rpx',
				color: color
			}"
		 v-if="isHours">
			{{ h }}
		</view>
		<view class="tui-timer__colon" :style="{ lineHeight: colonSize + 'rpx', fontSize: colonSize + 'rpx', color: colonColor }"
		 v-if="isHours">{{ isColon ? ':' : '' }}</view>
		<view class="tui-timer__item" :style="{
				background: backgroundColor,
				border: borderWidth > 0 ? `${borderWidth}rpx solid ${borderColor}` : 0,
				width: getWidth(d, width) + 'rpx',
				height: height + 'rpx',
				fontSize: size + 'rpx',
				color: color
			}"
		 v-if="isMinutes">
			{{ m }}
		</view>
		<view class="tui-timer__colon" :style="{ lineHeight: colonSize + 'rpx', fontSize: colonSize + 'rpx', color: colonColor }"
		 v-if="isMinutes">:</view>
		<view class="tui-timer__item" :style="{
				background: backgroundColor,
				border: borderWidth > 0 ? `${borderWidth}rpx solid ${borderColor}` : 0,
				width: getWidth(d, width) + 'rpx',
				height: height + 'rpx',
				fontSize: size + 'rpx',
				color: color
			}"
		 v-if="isSeconds">
			{{ s }}
		</view>
		<view class="tui-timer__colon" :style="{ lineHeight: colonSize + 'rpx', fontSize: colonSize + 'rpx', color: colonColor }"
		 v-if="isSeconds && isMs">.</view>
		<view class="tui-timer__ms" :style="{
				background: backgroundColor,
				border: borderWidth > 0 ? `${borderWidth}rpx solid ${borderColor}` : 0,
				fontSize: msSize + 'rpx',
				color: msColor,
				height: height + 'rpx',
				width: msWidth > 0 ? msWidth + 'rpx' : 'auto'
			}"
		 v-if="isSeconds && isMs">
			<view :class="{ 'tui-ms__list': ani }">
				<view class="tui-ms__item" :style="{ height: height + 'rpx' }" v-for="(item, index) in ms" :key="index">{{ item }}</view>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		name: 'tuiTimer',
		props: {
			//数字框宽度
			width: {
				type: Number,
				default: 36
			},
			//数字框高度
			height: {
				type: Number,
				default: 36
			},
			borderWidth: {
				type: Number,
				default: 0
			},
			//数字框border颜色
			borderColor: {
				type: String,
				default: 'transparent'
			},
			//数字框背景颜色
			backgroundColor: {
				type: String,
				default: 'transparent'
			},
			//数字框字体大小
			size: {
				type: Number,
				default: 32
			},
			//数字框字体颜色
			color: {
				type: String,
				default: '#333'
			},
			//冒号或文字大小
			colonSize: {
				type: Number,
				default: 32
			},
			//冒号或文字颜色
			colonColor: {
				type: String,
				default: '#333'
			},
			//初始时间，单位s
			value: {
				type: [Number,String],
				default: 0
			},
			//最大时间，大于等于最大时间则计时结束，为0则需要手动结束 (单位：秒)
			maxTime: {
				type: Number,
				default: 0
			},
			//是否显示天
			isDays: {
				type: Boolean,
				default: false
			},
			//是否显示小时
			isHours: {
				type: Boolean,
				default: true
			},
			//是否显示分钟
			isMinutes: {
				type: Boolean,
				default: true
			},
			//是否显示秒数
			isSeconds: {
				type: Boolean,
				default: true
			},
			//是否显示毫秒
			isMs: {
				type: Boolean,
				default: false
			},
			msWidth: {
				type: Number,
				default: 0
			},
			msSize: {
				type: Number,
				default: 28
			},
			msColor: {
				type: String,
				default: '#333'
			},
			//时分是否展示为冒号,false为文字
			isColon: {
				type: Boolean,
				default: true
			},
			//是否自动开始(传值false，则需要手动调用方法)
			start: {
				type: Boolean,
				default: true
			}
		},
		data() {
			return {
				d: '0',
				h: '00',
				m: '00',
				s: '00',
				ms: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
				seconds: 0,
				loop: null,
				ani: false
			};
		},
		created() {
			this.seconds = Number(this.value);
			this.timer(this.seconds);
			if (this.start) {
				this.startTiming();
			}
		},
		beforeDestroy() {
			this.clearTimer();
		},
		watch: {
			value(val) {
				this.clearTimer();
				this.seconds = Number(val);
				this.timer(this.seconds);
				setTimeout(() => {
					if (this.start) {
						this.startTiming();
					}
				}, 0);
			}
		},
		methods: {
			getWidth(num, width) {
				return num > 99 ? (width / 2) * num.toString().length : width;
			},
			clearTimer() {
				this.ani = false;
				clearInterval(this.loop);
				this.loop = null;
			},
			//开始
			startTiming() {
				if (this.seconds >= this.maxTime && this.maxTime != 0) {
					this.endTimer();
					return
				}
				this.clearTimer();
				this.ani = true;
				this.loop = setInterval(() => {
					this.seconds++;
					this.timer(this.seconds);
					if (this.seconds >= this.maxTime && this.maxTime != 0) {
						this.endTimer();
					}
				}, 1000);
			},
			//重置
			resetTimer() {
				this.d = '0';
				this.h = '00';
				this.m = '00';
				this.s = '00';
				this.seconds = 0;
				this.clearTimer();
				setTimeout(() => {
					this.startTiming();
				}, 0);
			},
			//结束 | 暂停
			endTimer() {
				this.clearTimer();
				this.$emit('end', {
					day: this.d,
					hour: this.h,
					minute: this.m,
					second: this.s,
					totalSeconds: this.seconds
				});
			},
			timer(seconds) {
				let [day, hour, minute, second] = [0, 0, 0, 0];
				if (seconds > 0) {
					day = this.isDays ? Math.floor(seconds / (60 * 60 * 24)) : 0;
					hour = this.isHours ? Math.floor(seconds / (60 * 60)) - day * 24 : 0;
					minute = this.isMinutes ? Math.floor(seconds / 60) - hour * 60 - day * 24 * 60 : 0;
					second = this.isSeconds ? Math.floor(seconds) - day * 24 * 60 * 60 - hour * 60 * 60 - minute * 60 : 0;
				}
				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.m = minute;
				this.s = second;
			}
		}
	};
</script>

<style scoped>
	.tui-timer__box {
		display: inline-flex;
		align-items: center;
		justify-content: center;
	}

	.tui-timer__item,
	.tui-timer__colon {
		display: flex;
		align-items: center;
		justify-content: center;
		border-radius: 6rpx;
	}

	.tui-timer__ms {
		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>
