import { error, redirect } from '@sveltejs/kit';
import { baggedPeaks, deleteActivity, getActivity } from '$lib/server/db';
import { haversine } from '$lib/server/gpx';
import type { Actions, PageServerLoad } from './$types';

export const load: PageServerLoad = ({ params, locals }) => {
	const activity = getActivity(Number(params.id));
	if (!activity) error(404, 'Activity not found');

	const points = JSON.parse(activity.points) as {
		lat: number;
		lon: number;
		ele: number | null;
		t: number | null;
	}[];

	const latlngs = points.map((p) => [p.lat, p.lon] as [number, number]);

	// cumulative-distance elevation profile
	const profile: { d: number; ele: number }[] = [];
	let dist = 0;
	for (let i = 0; i < points.length; i++) {
		if (i > 0) {
			dist += haversine(points[i - 1].lat, points[i - 1].lon, points[i].lat, points[i].lon);
		}
		if (points[i].ele !== null) profile.push({ d: dist, ele: points[i].ele! });
	}

	const bagged = baggedPeaks(activity.id, activity.user_id);

	return {
		activity: { ...activity, points: undefined },
		canDelete: locals.user?.id === activity.user_id,
		latlngs,
		profile,
		bagged: bagged.map((p) => ({
			id: p.id,
			name: p.name,
			elevation_m: Math.round(p.elevation_m ?? 0),
			lat: p.lat,
			lon: p.lon,
			climbed: true
		}))
	};
};

export const actions: Actions = {
	delete: async ({ params, locals }) => {
		if (!locals.user) error(401, 'Not signed in');
		deleteActivity(Number(params.id), locals.user.id);
		redirect(303, '/activities');
	}
};