use ruma::api::{
	client::error::ErrorKind,
	federation::{
		device::get_devices::{self, v1::UserDevice},
		keys::{claim_keys, get_keys},
	},
};

use crate::{
	client::{claim_keys_helper, get_keys_helper},
	service::user_is_local,
	services, Error, Result, Ruma,
};

/// # `GET /_matrix/federation/v1/user/devices/{userId}`
///
/// Gets information on all devices of the user.
pub(crate) async fn get_devices_route(body: Ruma<get_devices::v1::Request>) -> Result<get_devices::v1::Response> {
	if !user_is_local(&body.user_id) {
		return Err(Error::BadRequest(
			ErrorKind::InvalidParam,
			"Tried to access user from other server.",
		));
	}

	let origin = body.origin.as_ref().expect("server is authenticated");

	Ok(get_devices::v1::Response {
		user_id: body.user_id.clone(),
		stream_id: services()
			.users
			.get_devicelist_version(&body.user_id)?
			.unwrap_or(0)
			.try_into()
			.expect("version will not grow that large"),
		devices: services()
			.users
			.all_devices_metadata(&body.user_id)
			.filter_map(Result::ok)
			.filter_map(|metadata| {
				let device_id_string = metadata.device_id.as_str().to_owned();
				let device_display_name = if services().globals.allow_device_name_federation() {
					metadata.display_name
				} else {
					Some(device_id_string)
				};
				Some(UserDevice {
					keys: services()
						.users
						.get_device_keys(&body.user_id, &metadata.device_id)
						.ok()??,
					device_id: metadata.device_id,
					device_display_name,
				})
			})
			.collect(),
		master_key: services()
			.users
			.get_master_key(None, &body.user_id, &|u| u.server_name() == origin)?,
		self_signing_key: services()
			.users
			.get_self_signing_key(None, &body.user_id, &|u| u.server_name() == origin)?,
	})
}

/// # `POST /_matrix/federation/v1/user/keys/query`
///
/// Gets devices and identity keys for the given users.
pub(crate) async fn get_keys_route(body: Ruma<get_keys::v1::Request>) -> Result<get_keys::v1::Response> {
	if body.device_keys.iter().any(|(u, _)| !user_is_local(u)) {
		return Err(Error::BadRequest(
			ErrorKind::InvalidParam,
			"User does not belong to this server.",
		));
	}

	let result = get_keys_helper(
		None,
		&body.device_keys,
		|u| Some(u.server_name()) == body.origin.as_deref(),
		services().globals.allow_device_name_federation(),
	)
	.await?;

	Ok(get_keys::v1::Response {
		device_keys: result.device_keys,
		master_keys: result.master_keys,
		self_signing_keys: result.self_signing_keys,
	})
}

/// # `POST /_matrix/federation/v1/user/keys/claim`
///
/// Claims one-time keys.
pub(crate) async fn claim_keys_route(body: Ruma<claim_keys::v1::Request>) -> Result<claim_keys::v1::Response> {
	if body.one_time_keys.iter().any(|(u, _)| !user_is_local(u)) {
		return Err(Error::BadRequest(
			ErrorKind::InvalidParam,
			"Tried to access user from other server.",
		));
	}

	let result = claim_keys_helper(&body.one_time_keys).await?;

	Ok(claim_keys::v1::Response {
		one_time_keys: result.one_time_keys,
	})
}