Retrieves a specific budget, which includes budget lines

//native

type Xero = {

	token: string

}

/**

 * Retrieves a specific budget, which includes budget lines

 *

 */

export async function main(

	auth: Xero,

	BudgetID: string,

	DateTo: string | undefined,

	DateFrom: string | undefined,

	xero_tenant_id: string

) {

	const url = new URL(`https://api.xero.com/api.xro/2.0/Budgets/${BudgetID}`)

	for (const [k, v] of [

		['DateTo', DateTo],

		['DateFrom', DateFrom]

	]) {

		if (v !== undefined && v !== '' && k !== undefined) {

			url.searchParams.append(k, v)

		}

	}

	const response = await fetch(url, {

		method: 'GET',

		headers: {

      Accept: 'application/json',

			'xero-tenant-id': xero_tenant_id,

			Authorization: 'Bearer ' + auth.token

		},

		body: undefined

	})

	if (!response.ok) {

		const text = await response.text()

		throw new Error(`${response.status} ${text}`)

	}

	return await response.json()

}