<template>
	<canvas ref="chartEl"></canvas>
</template>

<script lang="ts" setup>
import { watch, onMounted, onUnmounted, ref, shallowRef } from "vue";
import { Chart } from "chart.js";
import number from "@/filters/number";
import * as os from "@/os";
import { defaultStore } from "@/store";
import { useChartTooltip } from "@/scripts/use-chart-tooltip";
import { chartVLine } from "@/scripts/chart-vline";
import { alpha } from "@/scripts/color";
import { initChart } from "@/scripts/init-chart";

initChart();

const props = defineProps<{
	type: string;
}>();

const chartEl = shallowRef<HTMLCanvasElement>(null);

const { handler: externalTooltipHandler } = useChartTooltip();

let chartInstance: Chart;

function setData(values) {
	if (chartInstance == null) return;
	for (const value of values) {
		chartInstance.data.labels.push("");
		chartInstance.data.datasets[0].data.push(value);
		if (chartInstance.data.datasets[0].data.length > 100) {
			chartInstance.data.labels.shift();
			chartInstance.data.datasets[0].data.shift();
		}
	}
	chartInstance.update();
}

function pushData(value) {
	if (chartInstance == null) return;
	chartInstance.data.labels.push("");
	chartInstance.data.datasets[0].data.push(value);
	if (chartInstance.data.datasets[0].data.length > 100) {
		chartInstance.data.labels.shift();
		chartInstance.data.datasets[0].data.shift();
	}
	chartInstance.update();
}

const label =
	props.type === "process"
		? "Process"
		: props.type === "active"
		? "Active"
		: props.type === "delayed"
		? "Delayed"
		: props.type === "waiting"
		? "Waiting"
		: ("?" as never);

const color =
	props.type === "process"
		? "#c4a7e7"
		: props.type === "active"
		? "#31748f"
		: props.type === "delayed"
		? "#eb6f92"
		: props.type === "waiting"
		? "#f6c177"
		: ("?" as never);

onMounted(() => {
	const vLineColor = defaultStore.state.darkMode
		? "rgba(255, 255, 255, 0.2)"
		: "rgba(0, 0, 0, 0.2)";

	chartInstance = new Chart(chartEl.value, {
		type: "line",
		data: {
			labels: [],
			datasets: [
				{
					label: label,
					pointRadius: 0,
					tension: 0.3,
					borderWidth: 2,
					borderJoinStyle: "round",
					borderColor: color,
					backgroundColor: alpha(color, 0.2),
					fill: true,
					data: [],
				},
			],
		},
		options: {
			aspectRatio: 2.5,
			layout: {
				padding: {
					left: 0,
					right: 0,
					top: 0,
					bottom: 0,
				},
			},
			scales: {
				x: {
					grid: {
						display: false,
					},
					ticks: {
						display: false,
						maxTicksLimit: 10,
					},
				},
				y: {
					min: 0,
					grid: {},
				},
			},
			interaction: {
				intersect: false,
			},
			plugins: {
				legend: {
					display: false,
				},
				tooltip: {
					enabled: false,
					mode: "index",
					animation: {
						duration: 0,
					},
					external: externalTooltipHandler,
				},
			},
		},
		plugins: [chartVLine(vLineColor)],
	});
});

defineExpose({
	setData,
	pushData,
});
</script>

<style lang="scss" scoped></style>
