<template>
	<!-- #ifdef APP -->
	<scroll-view style="flex:1;padding: 6px;">
	<!-- #endif -->
		<text class="uni-h3">摇一摇</text>
		<text>握住手机并快速摇晃，会调用加速计传感器，依据加速度变化检测动作，并弹出提示。</text>

		<text class="log-text margin-v">{{ statusText }}</text>
		<view class="uni-row margin-v">
			<view class="metric-box">
				<text>瞬时变化</text>
				<text class="metric-value">{{ deltaText }}</text>
			</view>
			<view class="metric-box metric-box-space">
				<text>触发次数</text>
				<text class="metric-value">{{ shakeCountText }}</text>
			</view>
		</view>
		
		<view class="sensitivity-header">
			<text>灵敏度</text>
			<text class="sensitivity-value">{{ sensitivityLabel }}</text>
		</view>
		<slider class="sensitivity-slider" :value="sensitivityValue" :min="1" :max="5" :step="1"
			@changing="onSensitivityChanging" @change="onSensitivityChange" />
		<text class="sensitivity-tip">当前触发阈值：{{ thresholdText }}，数值越低灵敏度越高，越容易触发。</text>

	<!-- #ifdef APP -->
	</scroll-view>
	<!-- #endif -->
</template>

<script setup lang="uts">
	const statusText = ref('正在初始化传感器...')
	const deltaText = ref('0.00')
	const shakeCountText = ref('0')
	const thresholdText = ref('1.35')
	const sensitivityLabel = ref('中')
	const sensitivityValue = ref(3)

	const shakeCooldown = 1200
	let lastMagnitude : number | null = null
	let lastShakeTime = 0
	let shakeCount = 0
	let shakeThreshold = 1.35

	function formatNumber(value : number) : string {
		return value.toFixed(2)
	}

	function createMagnitude(x : number, y : number, z : number) : number {
		return Math.sqrt(x * x + y * y + z * z)
	}

	function getSensitivityLabel(value : number) : string {
		if (value <= 1) {
			return '很低'
		}
		if (value == 2) {
			return '较低'
		}
		if (value == 3) {
			return '中'
		}
		if (value == 4) {
			return '较高'
		}
		return '很高'
	}

	function syncSensitivity(value : number) : void {
		sensitivityValue.value = value
		shakeThreshold = 2.1 - value * 0.25
		thresholdText.value = formatNumber(shakeThreshold)
		sensitivityLabel.value = getSensitivityLabel(value)
	}

	function triggerShake(now : number) : void {
		lastShakeTime = now
		shakeCount = shakeCount + 1
		shakeCountText.value = `${shakeCount}`
		statusText.value = '检测成功，继续摇晃可再次触发'
		uni.showToast({
			title: '检测到摇一摇',
			icon: 'none'
		})
	}

	const accelerometerListener : OnAccelerometerChangeCallback = (result : OnAccelerometerChangeCallbackResult) => {
		const magnitude = createMagnitude(result.x, result.y, result.z)
		if (lastMagnitude == null) {
			lastMagnitude = magnitude
			statusText.value = '请开始摇晃手机'
			return
		}

		const delta = Math.abs(magnitude - (lastMagnitude as number))
		deltaText.value = formatNumber(delta)
		lastMagnitude = magnitude

		const now = Date.now()
		const passed = now - lastShakeTime
		if (delta > shakeThreshold && passed > shakeCooldown) {
			triggerShake(now)
		}
	}

	function onSensitivityChanging(event : UniSliderChangeEvent) : void {
		syncSensitivity(event.detail.value)
	}

	function onSensitivityChange(event : UniSliderChangeEvent) : void {
		syncSensitivity(event.detail.value)
		statusText.value = `当前灵敏度：${sensitivityLabel.value}，请继续摇晃手机`
	}

	function startListen() : void {
		uni.startAccelerometer({
			interval: 'game',
			success: () => {
				statusText.value = '请开始摇晃手机'
			},
			fail: (error) => {
				statusText.value = error.errMsg != null ? error.errMsg : '传感器启动失败'
			}
		})
	}

	function stopListen() : void {
		uni.stopAccelerometer({
			success: () => {
				statusText.value = '已停止监听'
			}
		})
	}

	onReady(() => {
		syncSensitivity(sensitivityValue.value)
		uni.onAccelerometerChange(accelerometerListener)
		startListen()
	})

	onShow(() => {
		startListen()
	})

	onHide(() => {
		stopListen()
	})

	onUnload(() => {
		uni.offAccelerometerChange(accelerometerListener)
		uni.stopAccelerometer()
	})
</script>

<style>
	.card-space {
		margin: 5px;
	}

	.margin-v {
	  margin: 5px 0;
	}
	.log-text {
	  padding: 10px;
		font-size: 14px;
	  border: 1px solid #ccc;
	}

	.metric-box {
		flex: 1;
		padding: 14px;
	}

	.metric-box-space {
		margin-left: 10px;
	}

	.metric-value {
		margin-top: 4px;
		font-size: 30px;
	}

	.sensitivity-header {
		display: flex;
		flex-direction: row;
		justify-content: space-between;
		align-items: center;
	}

	.sensitivity-slider {
		margin: 15px;
	}

	

</style>