use std::time::Duration;

use axum::extract::State;
use conduwuit::{Err, Result};
use futures::{FutureExt, StreamExt, TryFutureExt};
use ruma::{
	api::federation::{
		device::get_devices::{self, v1::UserDevice},
		keys::{claim_keys, get_keys},
	},
	assign,
};

use crate::{
	Ruma,
	client::{claim_keys_helper, get_keys_helper},
};

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

	let stream_id = services
		.users
		.get_devicelist_version(&body.user_id)
		.await
		.unwrap_or(0)
		.try_into()
		.expect("device list version should fit into a UInt");

	let devices = services
		.users
		.all_devices_metadata(&body.user_id)
		.filter_map(async |metadata| {
			let device_id = metadata.device_id.clone();
			let device_id_clone = device_id.clone();
			let device_id_string = device_id.as_str().to_owned();
			let device_display_name = if services.globals.allow_device_name_federation() {
				metadata.display_name.clone()
			} else {
				Some(device_id_string)
			};

			services
				.users
				.get_device_keys(&body.user_id, &device_id_clone)
				.map_ok(|keys| assign!(UserDevice::new(device_id, keys), { device_display_name }))
				.map(Result::ok)
				.await
		})
		.collect()
		.await;

	let master_key = services
		.users
		.get_master_key(None, &body.user_id, &|u| u.server_name() == body.identity)
		.await
		.ok();

	let self_signing_key = services
		.users
		.get_self_signing_key(None, &body.user_id, &|u| u.server_name() == body.identity)
		.await
		.ok();

	Ok(assign!(get_devices::v1::Response::new(body.user_id.clone(), stream_id), {
		devices, master_key, self_signing_key
	}))
}

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

	let result = get_keys_helper(
		&services,
		None,
		&body.device_keys,
		|u| u.server_name() == body.identity,
		services.globals.allow_device_name_federation(),
		Duration::from_secs(0),
	)
	.await?;

	Ok(assign!(get_keys::v1::Response::new(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(
	State(services): State<crate::State>,
	body: Ruma<claim_keys::v1::Request>,
) -> Result<claim_keys::v1::Response> {
	if body
		.one_time_keys
		.iter()
		.any(|(u, _)| !services.globals.user_is_local(u))
	{
		return Err!(Request(InvalidParam("Tried to access user from other server.")));
	}

	let result =
		claim_keys_helper(&services, &body.one_time_keys, Duration::from_secs(0)).await?;

	Ok(claim_keys::v1::Response::new(result.one_time_keys))
}