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//! [GET /_matrix/client/r0/admin/whois/{userId}](https://matrix.org/docs/spec/client_server/r0.6.0#get-matrix-client-r0-admin-whois-userid)

use std::{collections::BTreeMap, time::SystemTime};

use ruma_api::ruma_api;
use ruma_identifiers::UserId;
use serde::{Deserialize, Serialize};

ruma_api! {
    metadata: {
        description: "Get information about a particular user.",
        method: GET,
        name: "get_user_info",
        path: "/_matrix/client/r0/admin/whois/:user_id",
        rate_limited: false,
        authentication: AccessToken,
    }

    request: {
        /// The user to look up.
        #[ruma_api(path)]
        pub user_id: &'a UserId,
    }

    #[derive(Default)]
    response: {
        /// The Matrix user ID of the user.
        #[serde(skip_serializing_if = "Option::is_none")]
        pub user_id: Option<UserId>,

        /// 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>,
    }

    error: crate::Error
}

impl<'a> Request<'a> {
    /// Creates a new `Request` with the given user id.
    pub fn new(user_id: &'a UserId) -> 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, Deserialize, Serialize)]
pub struct DeviceInfo {
    /// A list of user sessions on this device.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub sessions: Vec<SessionInfo>,
}

/// Information about a user session.
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct SessionInfo {
    /// A list of connections in this session.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub connections: Vec<ConnectionInfo>,
}

/// Information about a connection in a user session.
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct ConnectionInfo {
    /// Most recently seen IP address of the session.
    pub ip: Option<String>,

    /// Time when that the session was last active.
    #[serde(with = "ruma_serde::time::opt_ms_since_unix_epoch")]
    pub last_seen: Option<SystemTime>,

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