import { parseInput } from './lib/validate.ts'
import { idField, tzField } from './lib/fields.ts'
import { line, normalizeId, requireTodo, isOverdue, resolveTimeZone } from './lib/store.ts'

/**
 * Get one todo/task from the shared todo list by id, including its full change history.
 *
 * @param input - `{ id: string ("T12" or "12"), timeZone?: string }`
 * @returns `{ todo, overdue, line }`
 *
 * @example
 * import getTodo from 'kody:@charlesmatte/todos/get'
 *
 * const { todo } = await getTodo({ id: 'T12' })
 */
export default async function getTodo(input: unknown) {
	const p = parseInput<{ id: string; timeZone?: string }>(input, { id: idField, timeZone: tzField }, 'todos/get')
	const todo = await requireTodo(normalizeId(p.id))
	const tz = await resolveTimeZone(p.timeZone)
	return { todo, overdue: isOverdue(todo, tz), line: line(todo, tz) }
}