<!--
SPDX-FileCopyrightText: syuilo and misskey-project
SPDX-License-Identifier: AGPL-3.0-only
-->

<template>
<svg :viewBox="`0 0 ${ viewBoxX } ${ viewBoxY }`" :class="$style.root" @mousedown.prevent="onMousedown">
	<polyline
		:points="pointsNote"
		fill="none"
		stroke-width="1"
		stroke="#41ddde"
	/>
	<polyline
		:points="pointsReply"
		fill="none"
		stroke-width="1"
		stroke="#f7796c"
	/>
	<polyline
		:points="pointsRenote"
		fill="none"
		stroke-width="1"
		stroke="#a1de41"
	/>
	<polyline
		:points="pointsTotal"
		fill="none"
		stroke-width="1"
		stroke="#555"
		stroke-dasharray="2 2"
	/>
</svg>
</template>

<script lang="ts" setup>
import { ref } from 'vue';
const props = defineProps<{
	activity: {
		total: number;
		notes: number;
		replies: number;
		renotes: number;
	}[]
}>();

const viewBoxX = ref(147);
const viewBoxY = ref(60);
const zoom = ref(1);
const pos = ref(0);
const pointsNote = ref<string>();
const pointsReply = ref<string>();
const pointsRenote = ref<string>();
const pointsTotal = ref<string>();

function dragListen(fn) {
	window.addEventListener('mousemove', fn);
	window.addEventListener('mouseleave', dragClear.bind(null, fn));
	window.addEventListener('mouseup', dragClear.bind(null, fn));
}

function dragClear(fn) {
	window.removeEventListener('mousemove', fn);
	window.removeEventListener('mouseleave', dragClear);
	window.removeEventListener('mouseup', dragClear);
}

function onMousedown(ev) {
	const clickX = ev.clientX;
	const clickY = ev.clientY;
	const baseZoom = zoom.value;
	const basePos = pos.value;

	// 動かした時
	dragListen(me => {
		let moveLeft = me.clientX - clickX;
		let moveTop = me.clientY - clickY;

		zoom.value = Math.max(1, baseZoom + (-moveTop / 20));
		pos.value = Math.min(0, basePos + moveLeft);
		if (pos.value < -(((props.activity.length - 1) * zoom.value) - viewBoxX.value)) pos.value = -(((props.activity.length - 1) * zoom.value) - viewBoxX.value);

		render();
	});
}

function render() {
	const peak = Math.max(...props.activity.map(d => d.total));
	if (peak !== 0) {
		const activity = props.activity.slice().reverse();
		pointsNote.value = activity.map((d, i) => `${(i * zoom.value) + pos.value},${(1 - (d.notes / peak)) * viewBoxY.value}`).join(' ');
		pointsReply.value = activity.map((d, i) => `${(i * zoom.value) + pos.value},${(1 - (d.replies / peak)) * viewBoxY.value}`).join(' ');
		pointsRenote.value = activity.map((d, i) => `${(i * zoom.value) + pos.value},${(1 - (d.renotes / peak)) * viewBoxY.value}`).join(' ');
		pointsTotal.value = activity.map((d, i) => `${(i * zoom.value) + pos.value},${(1 - (d.total / peak)) * viewBoxY.value}`).join(' ');
	}
}
</script>

<style lang="scss" module>
.root {
	display: block;
	padding: 16px;
	width: 100%;
	box-sizing: border-box;
	cursor: all-scroll;
}
</style>
