import { merge } from 'lodash-es';
import { type ChartOptions, type ScriptableContext } from 'chart.js';
import { useCssVar } from '@vueuse/core';
import { smartDecimal } from '@n8n/utils/number/smartDecimal';

/**
 *
 * Chart js configuration
 */

export const generateLinearGradient = (ctx: CanvasRenderingContext2D, height: number) => {
	const gradient = ctx.createLinearGradient(0, 0, 0, height);
	gradient.addColorStop(0, 'rgba(255, 111,92, 1)');
	gradient.addColorStop(0.8, 'rgba(255, 111, 92, 0.25)');
	gradient.addColorStop(1, 'rgba(255, 111, 92, 0)');
	return gradient;
};

export const generateLineChartOptions = (
	overrides: ChartOptions<'line'> = {},
): ChartOptions<'line'> => {
	const colorTextDark = useCssVar('--color-text-dark', document.body);
	const colorBackgroundLight = useCssVar('--color-background-xlight', document.body);
	const colorForeGroundBase = useCssVar('--color-foreground-base', document.body);

	const colorTextLight = useCssVar('--color-text-light', document.body);

	return merge(
		{
			responsive: true,
			maintainAspectRatio: false,
			plugins: {
				legend: {
					display: false,
				},
				tooltip: {
					caretSize: 0,
					xAlign: 'center',
					yAlign: 'bottom',
					padding: 16,
					titleFont: {
						size: 14,
					},
					bodyFont: {
						size: 14,
					},
					backgroundColor: colorBackgroundLight.value,
					titleColor: colorTextDark.value,
					bodyColor: colorTextDark.value,
					borderWidth: 1,
					borderColor: colorForeGroundBase.value,
					callbacks: {
						label(context: ScriptableContext<'line'>) {
							const label = context.dataset.label ?? '';
							return `${label} ${smartDecimal(context.parsed.y).toLocaleString('en-US')}`;
						},
						labelColor(context: ScriptableContext<'line'>) {
							return {
								borderColor: 'rgba(0, 0, 0, 0)',
								backgroundColor: context.dataset.backgroundColor as string,
								borderWidth: 0,
								borderRadius: 2,
							};
						},
					},
				},
			},
			interaction: {
				mode: 'nearest',
				axis: 'x',
				intersect: false,
			},
			scales: {
				x: {
					grid: {
						display: false,
					},
					stacked: true,
					beginAtZero: true,
					border: {
						display: false,
					},
					ticks: {
						color: colorTextLight.value,
					},
				},
				y: {
					grid: {
						color: colorForeGroundBase.value,
					},
					stacked: true,
					border: {
						display: false,
					},
					ticks: {
						maxTicksLimit: 3,
						color: colorTextLight.value,
					},
				},
			},
		},
		overrides,
	);
};

export const generateBarChartOptions = (
	overrides: ChartOptions<'bar'> = {},
): ChartOptions<'bar'> => {
	const colorTextLight = useCssVar('--color-text-light', document.body);
	const colorTextDark = useCssVar('--color-text-dark', document.body);
	const colorBackgroundLight = useCssVar('--color-background-xlight', document.body);
	const colorForeGroundBase = useCssVar('--color-foreground-base', document.body);

	return merge(
		{
			responsive: true,
			maintainAspectRatio: false,
			plugins: {
				legend: {
					display: true,
					align: 'end',
					reverse: true,
					position: 'top',
					labels: {
						boxWidth: 8,
						boxHeight: 8,
						borderRadius: 2,
						useBorderRadius: true,
					},
				},
				tooltip: {
					caretSize: 0,
					xAlign: 'center',
					yAlign: 'bottom',
					padding: 16,
					titleFont: {
						size: 14,
					},
					bodyFont: {
						size: 14,
					},
					backgroundColor: colorBackgroundLight.value,
					titleColor: colorTextDark.value,
					bodyColor: colorTextDark.value,
					borderWidth: 1,
					borderColor: colorForeGroundBase.value,
					callbacks: {
						label(context: ScriptableContext<'bar'>) {
							const label = context.dataset.label ?? '';
							return `${label} ${context.parsed.y}`;
						},
						labelColor(context: ScriptableContext<'bar'>) {
							return {
								borderColor: 'rgba(0, 0, 0, 0)',
								backgroundColor: context.dataset.backgroundColor as string,
								borderWidth: 0,
								borderRadius: 2,
							};
						},
					},
				},
			},
			interaction: {
				mode: 'nearest',
				axis: 'x',
				intersect: false,
			},
			datasets: {
				bar: {
					maxBarThickness: 32,
					borderRadius: 4,
				},
			},
			scales: {
				x: {
					grid: {
						display: false,
					},
					stacked: true,
					beginAtZero: true,
					border: {
						display: false,
					},
					ticks: {
						color: colorTextLight.value,
					},
				},
				y: {
					grid: {
						color: colorForeGroundBase.value,
					},
					stacked: true,
					border: {
						display: false,
					},
					ticks: {
						maxTicksLimit: 3,
						color: colorTextLight.value,
					},
				},
			},
		},
		overrides,
	);
};