Update an attendance period.

//native

type Personio = {

	clientId: string

	clientSecret: string

}

/**

 * Update an attendance period.

 * Update an attendance period by given attendance period ID and return the attendance period ID.

 */

export async function main(

	auth: Personio,

	id: string,

	skip_approval: string | undefined,

	Beta: string,

	body: {} & {

		start?: { date_time: string }

		end?: { date_time: string }

		comment?: string

		project?: { id: string }

	}

) {

	const url = new URL(`https://api.personio.de/v2/attendance-periods/${id}`)

	for (const [k, v] of [['skip_approval', skip_approval]]) {

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

			url.searchParams.append(k, v)

		}

	}

	const response = await fetch(url, {

		method: 'PATCH',

		headers: {

			Beta: Beta,

			'Content-Type': 'application/json',

			Authorization: 'Bearer ' + (await getOAuthToken(auth, 'https://api.personio.de/oauth2/token'))

		},

		body: JSON.stringify(body)

	})

	if (!response.ok) {

		const text = await response.text()

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

	}

	return await response.text()

}

async function getOAuthToken(auth: Personio, tokenUrl: string): Promise<string> {

	const params = new URLSearchParams({

		grant_type: 'client_credentials',

		client_id: auth.clientId,

		client_secret: auth.clientSecret

	})

	const response = await fetch(tokenUrl, {

		method: 'POST',

		headers: {

			Authorization: 'Basic ' + btoa(`${auth.clientId}:${auth.clientSecret}`),

			'Content-Type': 'application/x-www-form-urlencoded'

		},

		body: params.toString()

	})

	if (!response.ok) {

		const text = await response.text()

		throw new Error(`OAuth token request failed: ${response.status} ${text}`)

	}

	const data = await response.json()

	return data.access_token

}

}