// Categorical palette slots (validated for light and dark surfaces).
// Activity types map to fixed slots so a type keeps its color everywhere.

export const CAT_SLOTS = [
	{ light: '#2a78d6', dark: '#3987e5' }, // blue
	{ light: '#eb6834', dark: '#d95926' }, // orange
	{ light: '#1baf7a', dark: '#199e70' }, // aqua
	{ light: '#eda100', dark: '#c98500' }, // yellow
	{ light: '#e87ba4', dark: '#d55181' }, // magenta
	{ light: '#008300', dark: '#008300' }, // green
	{ light: '#4a3aa7', dark: '#9085e9' }, // violet
	{ light: '#e34948', dark: '#e66767' } // red
];

const TYPE_SLOT: Record<string, number> = {
	hiking: 0,
	hike: 0,
	walk: 0,
	walking: 0,
	run: 1,
	running: 1,
	'trail run': 1,
	ride: 2,
	cycling: 2,
	bike: 2,
	biking: 2,
	'virtual ride': 2,
	'mountain bike': 2,
	climb: 3,
	climbing: 3,
	'via ferrata': 3,
	alpinism: 3,
	ski: 6,
	'backcountry ski': 6,
	'nordic ski': 6,
	snowboard: 6,
	snowshoe: 6,
	segment: 7
};

function hash(s: string): number {
	let h = 0;
	for (let i = 0; i < s.length; i++) h = (h * 31 + s.charCodeAt(i)) | 0;
	return Math.abs(h);
}

export function typeSlot(type: string): number {
	const t = type.toLowerCase().trim();
	return TYPE_SLOT[t] ?? hash(t) % CAT_SLOTS.length;
}

export function typeColor(type: string): { light: string; dark: string } {
	return CAT_SLOTS[typeSlot(type)];
}