import { error, fail, redirect } from '@sveltejs/kit';
import { db } from '$lib/server/db';
import { groceries, categories } from '$lib/server/db/schema';
import { eq } from 'drizzle-orm';
import {
	categoriesService,
	groceriesService,
	referencesService,
} from '$lib/server/services';
import { idAction } from '$lib/server/services/grocery-actions';
import {
	numericId,
	parseFormString,
	parseOptionalNumber,
} from '$lib/server/services/validation';
import { isUniqueViolation } from '$lib/server/db/errors';
import type { Category, Grocery, Reference } from '$lib/server/services/types';
import type { Actions, PageServerLoad } from './$types';

export interface GroceryDetailOutput {
	item: Grocery & { categoryName: string | null };
	references: Reference[];
	categories: Category[];
}

export const load: PageServerLoad = async ({ params, url }) => {
	const id = numericId(params.id);

	const [item] = await db.select().from(groceries).where(eq(groceries.id, id));
	if (!item) throw error(404, 'Article introuvable');

	const [cat] = item.categoryId
		? await db
				.select()
				.from(categories)
				.where(eq(categories.id, item.categoryId))
		: [null];

	const refs = await referencesService.loadForGrocery(id);
	const cats = await categoriesService.loadAll();
	const from = url.searchParams.get('from') || '/';

	return {
		item: {
			...item,
			categoryName: cat?.name ?? null,
		},
		references: refs,
		categories: cats,
		from,
	};
};

export const actions: Actions = {
	add: async ({ request, params }) => {
		const data = await request.formData();
		const groceryId = numericId(params.id);
		const reference = parseFormString(data.get('reference'));
		const price = parseOptionalNumber(data.get('price'));
		const unit = parseFormString(data.get('unit'));
		const qualityScore = parseOptionalNumber(data.get('quality_score'));

		if (!reference) {
			return fail(400, { error: 'La référence est requise' });
		}

		await referencesService.add(
			groceryId,
			reference,
			price,
			unit,
			qualityScore,
		);
		return { success: true, type: 'add' as const };
	},

	delete: ({ request }) =>
		idAction(request, (id) => referencesService.deleteReference(id), {
			type: 'delete',
		}),

	promote: ({ request }) =>
		idAction(request, (id) => referencesService.promote(id), {
			type: 'promote',
		}),

	update: async ({ request, params }) => {
		const data = await request.formData();
		const groceryId = numericId(params.id);
		const name = parseFormString(data.get('name'));
		const rawCategoryId = parseOptionalNumber(data.get('category_id'));
		const categoryId = rawCategoryId === -1 ? null : rawCategoryId;

		if (!name) {
			return fail(400, { error: 'Le nom est requis' });
		}

		try {
			await groceriesService.updateGrocery(groceryId, name, categoryId);
		} catch (error) {
			if (isUniqueViolation(error)) {
				return fail(400, { error: 'Un article porte déjà ce nom' });
			}
			throw error;
		}
		return { success: true, type: 'update' as const };
	},

	deleteItem: async ({ params, request }) => {
		const groceryId = numericId(params.id);
		await groceriesService.deleteGrocery(groceryId);
		const data = await request.formData();
		const from = parseFormString(data.get('from')) || '/';
		throw redirect(303, from);
	},
};