import { z } from "zod";

export const RefinementMetadataSchema = z.object({
	skillName: z.string().min(1),
	refinedAt: z.string(),
	driftScore: z.number().min(0).max(1),
});

export type RefinementMetadata = z.infer<typeof RefinementMetadataSchema>;

export function canRefine(
	skillName: string,
	metadata: RefinementMetadata[],
	opts: { cooldownDays: number },
): boolean {
	const lastRefinement = metadata
		.filter((m) => m.skillName === skillName)
		.sort((a, b) => new Date(b.refinedAt).getTime() - new Date(a.refinedAt).getTime())[0];
	if (!lastRefinement) return true;
	const daysSince =
		(Date.now() - new Date(lastRefinement.refinedAt).getTime()) / (1000 * 60 * 60 * 24);
	return daysSince >= opts.cooldownDays;
}

export function recordRefinement(skillName: string, driftScore: number): RefinementMetadata {
	return { skillName, refinedAt: new Date().toISOString(), driftScore };
}