import { getLabResults, getRoutines, getSkinSnapshots } from '$lib/api';
import type { Routine, SkinConditionSnapshot } from '$lib/types';
import type { PageServerLoad } from './$types';

export const load: PageServerLoad = async () => {
	const [routines, snapshots, labResults] = await Promise.all([
		getRoutines({ from_date: recentDate(14) }),
		getSkinSnapshots({ from_date: recentDate(60) }),
		getLabResults({ latest_only: true, limit: 8 })
	]);
	return {
		recentRoutines: getFreshestRoutines(routines).slice(0, 10),
		recentSnapshots: snapshots,
		latestSnapshot: getFreshestSnapshot(snapshots),
		recentLabResults: labResults.items
	};
};

function recentDate(daysAgo: number): string {
	const d = new Date();
	d.setDate(d.getDate() - daysAgo);
	return d.toISOString().slice(0, 10);
}

function getFreshestSnapshot(snapshots: SkinConditionSnapshot[]): SkinConditionSnapshot | null {
	if (!snapshots.length) return null;
	return snapshots.reduce((freshest, current) => {
		if (current.snapshot_date > freshest.snapshot_date) return current;
		if (current.snapshot_date < freshest.snapshot_date) return freshest;
		return current.created_at > freshest.created_at ? current : freshest;
	});
}

function getFreshestRoutines(routines: Routine[]): Routine[] {
	return [...routines].sort((a, b) => {
		if (a.routine_date !== b.routine_date) return b.routine_date.localeCompare(a.routine_date);
		if (a.part_of_day !== b.part_of_day) return b.part_of_day.localeCompare(a.part_of_day);
		return b.created_at.localeCompare(a.created_at);
	});
}