import { db } from '$lib/database'
import type { Err } from '$lib/types'

export type Food = {
	rowid?: number,
	date?: Date,
	food: string,
	description?: string,
	amount: number,
	per100?: number,
	energy?: number,
}

const columns = ['rowid', 'date', 'food', 'description', 'amount', 'per100', 'energy']
const aggColumns = ['date', 'amount', 'avgPer100', 'energy']

const FoodService = {
	async GetAll() {
		return await db.select<Food[]>(`
select ${columns.join(', ')}
from food
order by date desc
		`)
	},
	async GetAllForDate(date: Date) {
		return await db.select<Food[]>(`
select ${columns.join(', ')}
from food
where strftime('%Y-%m-%d', date) = strftime('%Y-%m-%d', '2024-06-12')
or strftime('%Y-%m-%d', date) = strftime('%Y-%m-%d', date('2024-06-12', '-1 day'))
order by date DESC;
`, [date])
	},
	async Create(food: Food): Promise<[Food[], Err]> {
		if (!food.food) return [[food], 'food.food is required']
		if (!food.amount) throw [[food], 'food.amount is required']

		const res = await db.execute(`insert into food (food, description, amount) values ($1, $2, $3)`, [food.food, food.description, food.amount])
		const row = await db.select<Food[]>(`select ${columns.join(', ')} from food where rowid = $1`, [res.lastInsertId])

		return [row, null]
	},
	async GetDaily(): Promise<[Food[], Err]> {
		const rows = await db.select<Food[]>(`select ${aggColumns.join(', ')} from daily limit 100`)
		return [rows, null]
	},
	async GetWeekly(): Promise<[Food[], Err]> {
		const rows = await db.select<Food[]>(`select ${aggColumns.join(', ')} from weekly limit 100`)
		return [rows, null]
	},
	async GetMonthly(): Promise<[Food[], Err]> {
		const rows = await db.select<Food[]>(`select ${aggColumns.join(', ')} from monthly limit 100`)
		return [rows, null]
	},
	async GetYearly(): Promise<[Food[], Err]> {
		const rows = await db.select<Food[]>(`select ${aggColumns.join(', ')} from yearly limit 100`)
		return [rows, null]
	},
}

export { FoodService }