use ruma::api::client::{
    device::{
        self, delete_device, delete_devices, get_device, get_devices,
        update_device,
    },
    error::ErrorKind,
    uiaa::{AuthFlow, AuthType, UiaaInfo},
};

use super::SESSION_ID_LENGTH;
use crate::{services, utils, Ar, Error, Ra, Result};

/// # `GET /_matrix/client/r0/devices`
///
/// Get metadata on all devices of the sender user.
pub(crate) async fn get_devices_route(
    body: Ar<get_devices::v3::Request>,
) -> Result<Ra<get_devices::v3::Response>> {
    let sender_user = body.sender_user.as_ref().expect("user is authenticated");

    let devices: Vec<device::Device> = services()
        .users
        .all_devices_metadata(sender_user)
        .filter_map(Result::ok)
        .collect();

    Ok(Ra(get_devices::v3::Response {
        devices,
    }))
}

/// # `GET /_matrix/client/r0/devices/{deviceId}`
///
/// Get metadata on a single device of the sender user.
pub(crate) async fn get_device_route(
    body: Ar<get_device::v3::Request>,
) -> Result<Ra<get_device::v3::Response>> {
    let sender_user = body.sender_user.as_ref().expect("user is authenticated");

    let device = services()
        .users
        .get_device_metadata(sender_user, &body.body.device_id)?
        .ok_or(Error::BadRequest(ErrorKind::NotFound, "Device not found."))?;

    Ok(Ra(get_device::v3::Response {
        device,
    }))
}

/// # `PUT /_matrix/client/r0/devices/{deviceId}`
///
/// Updates the metadata on a given device of the sender user.
pub(crate) async fn update_device_route(
    body: Ar<update_device::v3::Request>,
) -> Result<Ra<update_device::v3::Response>> {
    let sender_user = body.sender_user.as_ref().expect("user is authenticated");

    let mut device = services()
        .users
        .get_device_metadata(sender_user, &body.device_id)?
        .ok_or(Error::BadRequest(ErrorKind::NotFound, "Device not found."))?;

    device.display_name.clone_from(&body.display_name);

    services().users.update_device_metadata(
        sender_user,
        &body.device_id,
        &device,
    )?;

    Ok(Ra(update_device::v3::Response {}))
}

/// # `DELETE /_matrix/client/r0/devices/{deviceId}`
///
/// Deletes the given device.
///
/// - Requires UIAA to verify user password
/// - Invalidates access token
/// - Deletes device metadata (device id, device display name, last seen ip,
///   last seen ts)
/// - Forgets to-device events
/// - Triggers device list updates
pub(crate) async fn delete_device_route(
    body: Ar<delete_device::v3::Request>,
) -> Result<Ra<delete_device::v3::Response>> {
    let sender_user = body.sender_user.as_ref().expect("user is authenticated");
    let sender_device =
        body.sender_device.as_ref().expect("user is authenticated");

    // UIAA
    let mut uiaainfo = UiaaInfo {
        flows: vec![AuthFlow {
            stages: vec![AuthType::Password],
        }],
        completed: Vec::new(),
        params: Box::default(),
        session: None,
        auth_error: None,
    };

    if let Some(auth) = &body.auth {
        let (worked, uiaainfo) = services().uiaa.try_auth(
            sender_user,
            sender_device,
            auth,
            &uiaainfo,
        )?;
        if !worked {
            return Err(Error::Uiaa(uiaainfo));
        }
    // Success!
    } else if let Some(json) = body.json_body {
        uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
        services().uiaa.create(sender_user, sender_device, &uiaainfo, &json)?;
        return Err(Error::Uiaa(uiaainfo));
    } else {
        return Err(Error::BadRequest(ErrorKind::NotJson, "Not json."));
    }

    services().users.remove_device(sender_user, &body.device_id)?;

    Ok(Ra(delete_device::v3::Response {}))
}

/// # `PUT /_matrix/client/r0/devices/{deviceId}`
///
/// Deletes the given device.
///
/// - Requires UIAA to verify user password
///
/// For each device:
/// - Invalidates access token
/// - Deletes device metadata (device id, device display name, last seen ip,
///   last seen ts)
/// - Forgets to-device events
/// - Triggers device list updates
pub(crate) async fn delete_devices_route(
    body: Ar<delete_devices::v3::Request>,
) -> Result<Ra<delete_devices::v3::Response>> {
    let sender_user = body.sender_user.as_ref().expect("user is authenticated");
    let sender_device =
        body.sender_device.as_ref().expect("user is authenticated");

    // UIAA
    let mut uiaainfo = UiaaInfo {
        flows: vec![AuthFlow {
            stages: vec![AuthType::Password],
        }],
        completed: Vec::new(),
        params: Box::default(),
        session: None,
        auth_error: None,
    };

    if let Some(auth) = &body.auth {
        let (worked, uiaainfo) = services().uiaa.try_auth(
            sender_user,
            sender_device,
            auth,
            &uiaainfo,
        )?;
        if !worked {
            return Err(Error::Uiaa(uiaainfo));
        }
    // Success!
    } else if let Some(json) = body.json_body {
        uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
        services().uiaa.create(sender_user, sender_device, &uiaainfo, &json)?;
        return Err(Error::Uiaa(uiaainfo));
    } else {
        return Err(Error::BadRequest(ErrorKind::NotJson, "Not json."));
    }

    for device_id in &body.devices {
        services().users.remove_device(sender_user, device_id)?;
    }

    Ok(Ra(delete_devices::v3::Response {}))
}