<template>
	<canvas v-if="canvasId" class="ec-canvas" :id="canvasId" :canvasId="canvasId" @touchstart="touchStart" @touchmove="touchMove"
	 @touchend="touchEnd" @error="error"></canvas>
</template>

<script>
	import WxCanvas from './wx-canvas';
	export default {
		props: {
			canvasId: {
				type: String,
				default: 'ec-canvas'
			},
			lazyLoad: {
				type: Boolean,
				default: false
			},
			disableTouch: {
				type: Boolean,
				default: false
			},
			throttleTouch: {
				type: Boolean,
				default: false
			}
		},
		// #ifdef H5
		mounted() {
			if (!this.lazyLoad) this.init();
		},
		// #endif
		// #ifndef H5
		onReady() {
			if (!this.lazyLoad) this.init();
		},
		// #endif
		methods: {
			setChart(chart) {
				this.chart = chart
			},
			init() {
				const {
					canvasId
				} = this;
				this.ctx = wx.createCanvasContext(canvasId, this);
				this.canvas = new WxCanvas(this.ctx, canvasId);
				const query = wx.createSelectorQuery().in(this);
				query
					.select(`#${canvasId}`)
					.boundingClientRect(res => {
						if (!res) {
							setTimeout(() => this.init(), 50);
							return;
						}
						this.$emit('onInit', {
							canvas: this.canvas,
							width: res.width,
							height: res.height
						});
					})
					.exec();
			},
			canvasToTempFilePath(opt) {
				const {
					canvasId
				} = this;
				this.ctx.draw(true, () => {
					wx.canvasToTempFilePath({
						canvasId,
						...opt
					});
				});
			},
			touchStart(e) {
				const {
					disableTouch,
					chart
				} = this;
				if (disableTouch || !chart || !e.mp.touches.length) return;
				const touch = e.mp.touches[0];
				chart._zr.handler.dispatch('mousedown', {
					zrX: touch.x,
					zrY: touch.y
				});
				chart._zr.handler.dispatch('mousemove', {
					zrX: touch.x,
					zrY: touch.y
				});
			},
			touchMove(e) {
				const {
					disableTouch,
					throttleTouch,
					chart,
					lastMoveTime
				} = this;
				if (disableTouch || !chart || !e.mp.touches.length) return;
				if (throttleTouch) {
					const currMoveTime = Date.now();
					if (currMoveTime - lastMoveTime < 240) return;
					this.lastMoveTime = currMoveTime;
				}
				const touch = e.mp.touches[0];
				chart._zr.handler.dispatch('mousemove', {
					zrX: touch.x,
					zrY: touch.y
				});
			},
			touchEnd(e) {
				const {
					disableTouch,
					chart
				} = this;
				if (disableTouch || !chart) return;
				const touch = e.mp.changedTouches ? e.mp.changedTouches[0] : {};
				chart._zr.handler.dispatch('mouseup', {
					zrX: touch.x,
					zrY: touch.y
				});
				chart._zr.handler.dispatch('click', {
					zrX: touch.x,
					zrY: touch.y
				});
			}
		}
	};
</script>

<style scoped>
	.ec-canvas {
		width: 100%;
		height: 100%;
		flex: 1;
	}
</style>
