import { isNumber } from '$lib/helpers/leaderboard';
import type { GroupScore, GuardModel } from '$lib/types/leaderboard';
import type {
	ToolsLanguageFilter,
	ToolsRadarScale,
	ToolsSortDirection,
	ToolsVizMetric
} from '$lib/types/tools';

export const toolsPalette = [
	'#3a55ff',
	'#0dce97',
	'#6b4bf5',
	'#f5a623',
	'#ff4d4f',
	'#21c1d6',
	'#b06bf5',
	'#5bd17a',
	'#ff8a3d',
	'#9aa3b2'
];

export function toolsDataGroups(models: readonly GuardModel[], allGroups: readonly string[]) {
	return allGroups.filter((group) => models.some((model) => isNumber(model.groups[group]?.score)));
}

export function toolsModelKey(model: GuardModel) {
	return model.modelId ?? model.name;
}

export function toolsModelColorMap(models: readonly GuardModel[]) {
	return new Map(
		models.map((model, index) => [toolsModelKey(model), toolsPalette[index % toolsPalette.length]])
	);
}

export function toolsModelColor(model: GuardModel, colorMap: ReadonlyMap<string, string>) {
	return colorMap.get(toolsModelKey(model)) ?? '#0dce97';
}

export function toolsSelectedModels(
	models: readonly GuardModel[],
	selectedModelKeys: readonly string[]
) {
	return models.filter((model) => selectedModelKeys.includes(toolsModelKey(model)));
}

export function toolsActiveGroups(
	selectedGroups: readonly string[],
	language: ToolsLanguageFilter,
	groupLanguages: Readonly<Record<string, string[]>>
) {
	return selectedGroups.filter(
		(group) => language === 'all' || groupLanguages[group]?.includes(language)
	);
}

export function toolsPinnedModels(
	models: readonly GuardModel[],
	pinnedModelKeys: readonly string[]
) {
	return models.filter((model) => pinnedModelKeys.includes(toolsModelKey(model)));
}

export function toolsCell(model: GuardModel, group: string) {
	return model.groups[group] ?? null;
}

export function toolsMetricValue(cell: GroupScore | null, key: ToolsVizMetric) {
	if (!cell) return null;
	return cell[key];
}

export function toolsRadarValue(cell: GroupScore | null, key: ToolsRadarScale) {
	if (!cell) return null;
	return cell[key];
}

export function toolsLatencySortValue(
	model: GuardModel,
	key: 'model' | 'p50' | 'p95' | 'p99' | 'errorRate'
) {
	if (key === 'model') return model.short.toLowerCase();
	return model[key];
}

export function toolsSortLatencyRows(
	rows: readonly GuardModel[],
	key: 'model' | 'p50' | 'p95' | 'p99' | 'errorRate',
	direction: ToolsSortDirection
) {
	return [...rows].sort((a, b) => {
		const aValue = toolsLatencySortValue(a, key);
		const bValue = toolsLatencySortValue(b, key);
		const result =
			typeof aValue === 'string' && typeof bValue === 'string'
				? aValue.localeCompare(bValue)
				: Number(aValue ?? Number.POSITIVE_INFINITY) - Number(bValue ?? Number.POSITIVE_INFINITY);
		return direction === 'asc' ? result : -result;
	});
}

export function toolsHeatColor(
	value: number | null | undefined,
	min = 0,
	max = 1,
	curve: 'linear' | 'sqrt' = 'linear'
) {
	if (!isNumber(value)) return 'transparent';
	const range = max - min;
	const normalized = range > 0 ? (value - min) / range : 0;
	const t =
		curve === 'sqrt'
			? Math.sqrt(Math.max(0, Math.min(1, normalized)))
			: Math.max(0, Math.min(1, normalized));
	if (t < 0.5) {
		const p = t / 0.5;
		return `rgb(${Math.round(13 + 242 * p)}, ${Math.round(206 - 36 * p)}, ${Math.round(151 - 111 * p)})`;
	}

	const p = (t - 0.5) / 0.5;
	return `rgb(${Math.round(255 - 25 * p)}, ${Math.round(170 - 93 * p)}, ${Math.round(40 + 39 * p)})`;
}

export function toolsRadarPoint(index: number, total: number, radius: number, cx = 260, cy = 214) {
	const angle = -Math.PI / 2 + (2 * Math.PI * index) / total;
	return { x: cx + Math.cos(angle) * radius, y: cy + Math.sin(angle) * radius };
}

export function toolsRadarPolygon(
	model: GuardModel,
	activeGroups: readonly string[],
	radarScale: ToolsRadarScale
) {
	return activeGroups
		.map((group, index) => {
			const value = toolsRadarValue(toolsCell(model, group), radarScale);
			const point = toolsRadarPoint(
				index,
				activeGroups.length,
				150 * Math.max(0, Math.min(1, value ?? 0))
			);
			return `${point.x.toFixed(1)},${point.y.toFixed(1)}`;
		})
		.join(' ');
}

export function toolsLineScale(d0: number, d1: number, r0: number, r1: number) {
	return (value: number) => r0 + ((value - d0) / (d1 - d0 || 1)) * (r1 - r0);
}

export function toolsNiceTicks(min: number, max: number, count = 5) {
	let step = Math.pow(10, Math.floor(Math.log((max - min || 1) / count) / Math.LN10));
	const error = (count * step) / (max - min || 1);

	if (error <= 0.15) step *= 10;
	else if (error <= 0.35) step *= 5;
	else if (error <= 0.75) step *= 2;

	const ticks: number[] = [];
	for (let tick = Math.ceil(min / step) * step; tick <= max + 1e-9; tick += step) {
		ticks.push(Math.round(tick * 1e6) / 1e6);
	}

	return ticks;
}

export function toolsScatterX(value: number, xMax: number) {
	return toolsLineScale(0, xMax, 52, 502)(value);
}

export function toolsScatterY(value: number, yMax: number) {
	return toolsLineScale(0, yMax, 368, 18)(value);
}

export function toolsBarY(value: number) {
	return toolsLineScale(0, 1, 268, 16)(value);
}

export function toolsBarLabelLines(label: string) {
	return label.split(/\s+/).reduce<string[]>((lines, word) => {
		const last = lines.at(-1);
		if (!last || `${last} ${word}`.length > 12) {
			lines.push(word);
			return lines;
		}

		lines[lines.length - 1] = `${last} ${word}`;
		return lines;
	}, []);
}

export function toolsParetoX(value: number, xMax: number) {
	return toolsLineScale(0, xMax, 56, 742)(value);
}

export function toolsParetoY(value: number, y0: number) {
	return toolsLineScale(y0, 1, 330, 18)(value);
}

export function toolsScatterPoint(model: GuardModel, xMax: number, yMax: number) {
	return { x: toolsScatterX(model.fpr, xMax), y: toolsScatterY(model.fnr, yMax) };
}

export function toolsParetoPoint(model: GuardModel, xMax: number, y0: number) {
	return { x: toolsParetoX(model.p95, xMax), y: toolsParetoY(model.integral, y0) };
}

export function toolsGroupMean(
	group: string,
	key: ToolsVizMetric,
	selectedModels: readonly GuardModel[]
) {
	const values = selectedModels
		.map((model) => toolsMetricValue(toolsCell(model, group), key))
		.filter(isNumber);
	if (!values.length) return null;
	return values.reduce((sum, value) => sum + value, 0) / values.length;
}

export function toolsScoreDelta(model: GuardModel) {
	const real = model.groups['Robustness Test (real)'];
	const robust = model.groups['Robustness Test (robust)'];
	if (!real || !robust) return 0;
	return robust.score - real.score;
}

export function toolsFnrDelta(model: GuardModel) {
	const real = model.groups['Robustness Test (real)'];
	const robust = model.groups['Robustness Test (robust)'];
	if (!real || !robust || !isNumber(real.fnr) || !isNumber(robust.fnr)) return null;
	return robust.fnr - real.fnr;
}

export function toolsRobustRows(selectedModels: readonly GuardModel[]) {
	return [...selectedModels]
		.filter(
			(model) => model.groups['Robustness Test (real)'] && model.groups['Robustness Test (robust)']
		)
		.sort((a, b) => toolsScoreDelta(a) - toolsScoreDelta(b));
}

export function toolsRowsToCsv(
	selectedModels: readonly GuardModel[],
	activeGroups: readonly string[]
) {
	const rows = selectedModels.flatMap((model) =>
		activeGroups.map((group) => {
			const cell = toolsCell(model, group);
			return [
				model.name,
				group,
				cell?.score?.toFixed(4) ?? '',
				cell?.fnr?.toFixed(4) ?? '',
				cell?.fpr?.toFixed(4) ?? '',
				cell?.f1?.toFixed(4) ?? ''
			];
		})
	);

	return [['model', 'group', 'score', 'fnr', 'fpr', 'f1'], ...rows]
		.map((row) => row.map((cell) => `"${String(cell).replaceAll('"', '""')}"`).join(','))
		.join('\n');
}

export function toolsCsvDataUri(
	selectedModels: readonly GuardModel[],
	activeGroups: readonly string[]
) {
	return `data:text/csv;charset=utf-8,${encodeURIComponent(toolsRowsToCsv(selectedModels, activeGroups))}`;
}