<template>
    <div class="countdown-wrapper" style="width: 100%">
        <template v-if="isNotStarted">
            <view class="fl_box fl_nowarp fl_justbet" style="width: 100%">
                <view class="fl_box">
                    <span class="colon">距离开始还剩</span>
                    <div class="time-block">{{ days }}</div>
                    <span class="colon">天</span>
                </view>
                <view style="color: #ff881a">待开始</view>
            </view>
        </template>

        <template v-else-if="isEnd">
            <view class="fl_box fl_nowarp fl_justbet" style="width: 100%">
                <view class="fl_box">
                    <span class="colon hui">距离结束还剩</span>
                    <div class="time-block huibg">00</div>
                    <span class="colon hui">:</span>
                    <div class="time-block huibg">00</div>
                    <span class="colon hui">:</span>
                    <div class="time-block huibg">00</div>
                </view>
                <view class="hui">已结束</view>
            </view>
        </template>

        <template v-else>
            <template v-if="showDays">
                <view class="fl_box fl_nowarp fl_justbet" style="width: 100%">
                    <view class="fl_box">
                        <span class="colon">距离结束还剩</span>
                        <div class="time-block">{{ days }}</div>
                        <span class="colon">天</span>
                    </view>
                    <view style="color: #18a14f">进行中</view>
                </view>
            </template>
            <template v-else>
                <view class="fl_box fl_nowarp fl_justbet" style="width: 100%">
                    <view class="fl_box">
                        <span class="colon">距离结束还剩</span>
                        <div class="time-block">{{ hours }}</div>
                        <span class="colon">:</span>
                        <div class="time-block">{{ minutes }}</div>
                        <span class="colon">:</span>
                        <div class="time-block">{{ seconds }}</div>
                    </view>
                    <view style="color: #18a14f">进行中</view>
                </view>
            </template>
        </template>
    </div>
</template>

<script setup>
import { ref, computed, onMounted, onUnmounted } from 'vue';

const props = defineProps({
    startTime: { type: [String, Number, Date], required: true },
    endTime: { type: [String, Number, Date], required: true },
    interval: { type: Number, default: 1000 },
});

const now = ref(Date.now());
let timer = null;

const startTimestamp = computed(() => new Date(props.startTime).getTime());
const endTimestamp = computed(() => new Date(props.endTime).getTime());

const isEnd = computed(() => now.value >= endTimestamp.value);
const isNotStarted = computed(() => now.value < startTimestamp.value);

const targetTimestamp = computed(() => {
    if (isNotStarted.value) return startTimestamp.value;
    if (!isEnd.value) return endTimestamp.value;
    return now.value;
});

const remainingMs = computed(() => Math.max(0, targetTimestamp.value - now.value));
const secondsTotal = computed(() => Math.floor(remainingMs.value / 1000));

const showDays = computed(() => secondsTotal.value >= 86400);
const days = computed(() => Math.ceil(secondsTotal.value / 86400));

const hours = computed(() => {
    const h = Math.floor(secondsTotal.value / 3600) % 24;
    return h.toString().padStart(2, '0');
});
const minutes = computed(() => {
    const m = Math.floor((secondsTotal.value % 3600) / 60);
    return m.toString().padStart(2, '0');
});
const seconds = computed(() => {
    const s = secondsTotal.value % 60;
    return s.toString().padStart(2, '0');
});

const startTimer = () => {
    timer = setInterval(() => {
        now.value = Date.now();
    }, props.interval);
};

const stopTimer = () => {
    if (timer) {
        clearInterval(timer);
        timer = null;
    }
};

onMounted(() => {
    startTimer();
});

onUnmounted(() => {
    stopTimer();
});
</script>

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

.time-block {
    font-family: 'PingFangSC-Medium', 'PingFang SC', 'Helvetica Neue', Helvetica, Arial, 'Microsoft YaHei', sans-serif;
    text-align: center;
    font-weight: 500;
    font-size: 28rpx;
    color: #ffffff;
    height: 44rpx;
    line-height: 44rpx;
    padding: 0 14rpx;
    background: #256bfa;
    border-radius: 8rpx 8rpx 8rpx 8rpx;
    margin: 0 10rpx;
}

.colon {
    font-family: PingFang SC, PingFang SC;
    font-weight: 400;
    font-size: 28rpx;
    color: #256bfa;
}

.day-text {
    font-size: 18px;
    color: #333;
}

.hui {
    color: #b6b6b6;
}
.huibg {
    background-color: #b6b6b6;
}
.lan {
    color: #256bfa;
}
</style>
