export function clamp(min: number, v: number, max: number): number {
	return Math.min(Math.max(min, v), max);
}

export function exhaustive(unexpected: never): never {
	throw err`Unexpected value ${unexpected}`;
}

export function fmt(lits: TemplateStringsArray, ...values: unknown[]): string {
	let out: unknown[] = [];
	for (let i = 0; ; i++) {
		out.push(lits[i]);

		if (i >= values.length) break;
		let v = values[i];

		let type = typeof v;
		switch (type) {
		case "bigint":
		case "boolean":
		case "number":
		case "symbol":
		case "undefined":
			out.push(v);
			break;
		case "object":
		case "string":
			out.push(JSON.stringify(v));
			break;
		case "function":
			out.push(`[function ${(v as Function).name}]`);
			break;
		default:
			let _: never = type;
			out.push(JSON.stringify(v));
		}
	}

	return out.join("");
}

class InterpolatedError extends Error {
	constructor(
		message: string,
		readonly values: unknown[],
	) {
		super(message);
	}
}

export function err(lits: TemplateStringsArray, ...values: unknown[]): Error {
	return new InterpolatedError(fmt(lits, ...values), values);
}