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//! `GET /_matrix/client/*/admin/whois/{userId}`
//!
//! Get information about a particular user.

pub mod v3 {
    //! `/v3/` ([spec])
    //!
    //! [spec]: https://spec.matrix.org/latest/client-server-api/#get_matrixclientv3adminwhoisuserid

    use std::collections::BTreeMap;

    use ruma_common::{
        api::{request, response, Metadata},
        metadata, MilliSecondsSinceUnixEpoch, OwnedUserId,
    };
    use serde::{Deserialize, Serialize};

    const METADATA: Metadata = metadata! {
        method: GET,
        rate_limited: false,
        authentication: AccessToken,
        history: {
            1.0 => "/_matrix/client/r0/admin/whois/:user_id",
            1.1 => "/_matrix/client/v3/admin/whois/:user_id",
        }
    };

    /// Request type for the `get_user_info` endpoint.
    #[request(error = crate::Error)]
    pub struct Request {
        /// The user to look up.
        #[ruma_api(path)]
        pub user_id: OwnedUserId,
    }

    /// Response type for the `get_user_info` endpoint.
    #[response(error = crate::Error)]
    #[derive(Default)]
    pub struct Response {
        /// The Matrix user ID of the user.
        #[serde(skip_serializing_if = "Option::is_none")]
        pub user_id: Option<OwnedUserId>,

        /// A map of the user's device identifiers to information about that device.
        #[serde(default, skip_serializing_if = "BTreeMap::is_empty")]
        pub devices: BTreeMap<String, DeviceInfo>,
    }

    impl Request {
        /// Creates a new `Request` with the given user id.
        pub fn new(user_id: OwnedUserId) -> Self {
            Self { user_id }
        }
    }

    impl Response {
        /// Creates an empty `Response`.
        pub fn new() -> Self {
            Default::default()
        }
    }

    /// Information about a user's device.
    #[derive(Clone, Debug, Default, Deserialize, Serialize)]
    #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
    pub struct DeviceInfo {
        /// A list of user sessions on this device.
        #[serde(default, skip_serializing_if = "Vec::is_empty")]
        pub sessions: Vec<SessionInfo>,
    }

    impl DeviceInfo {
        /// Create a new `DeviceInfo` with no sessions.
        pub fn new() -> Self {
            Self::default()
        }
    }

    /// Information about a user session.
    #[derive(Clone, Debug, Default, Deserialize, Serialize)]
    #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
    pub struct SessionInfo {
        /// A list of connections in this session.
        #[serde(default, skip_serializing_if = "Vec::is_empty")]
        pub connections: Vec<ConnectionInfo>,
    }

    impl SessionInfo {
        /// Create a new `SessionInfo` with no connections.
        pub fn new() -> Self {
            Self::default()
        }
    }

    /// Information about a connection in a user session.
    #[derive(Clone, Debug, Default, Deserialize, Serialize)]
    #[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
    pub struct ConnectionInfo {
        /// Most recently seen IP address of the session.
        pub ip: Option<String>,

        /// Time when that the session was last active.
        pub last_seen: Option<MilliSecondsSinceUnixEpoch>,

        /// User agent string last seen in the session.
        pub user_agent: Option<String>,
    }

    impl ConnectionInfo {
        /// Create a new `ConnectionInfo` with all fields set to `None`.
        pub fn new() -> Self {
            Self::default()
        }
    }
}