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//! # 🧑 User API
//!
//! This API lets you get the details of the currently signed in user.

use crate::ffi::user_v1 as ffi;

#[doc(hidden)]
pub use ffi::API as FFI_API;

type PlayerId = u64;

// ----------------------------------------------------------------------------

/// The unique identifier of a user.
///
/// Note: This type intentionally doesn't implement `Display` because it is designed to
/// be opaque and not be displayed or printed out (except for debug purposes)
#[derive(Clone, Debug, Hash, PartialEq, Eq)]
#[cfg_attr(feature = "with_serde", derive(serde::Serialize, serde::Deserialize))]
#[cfg_attr(feature = "with_speedy", derive(speedy::Writable, speedy::Readable))]
pub struct UserId(pub String);

impl From<UserId> for Vec<u8> {
    fn from(user_id: UserId) -> Self {
        user_id.0.into_bytes()
    }
}

impl AsRef<[u8]> for UserId {
    fn as_ref(&self) -> &[u8] {
        self.0.as_bytes()
    }
}

const LOCAL_PLAYER_ID: PlayerId = 0;

// ----------------------------------------------------------------------------

/// The User API gives you access to the currently signed in user's name.
#[derive(Copy, Clone)]
pub struct User {}

impl User {
    /// Returns the display name of the currently signed in user.
    ///
    /// If the signed in user does not have a preferred nickname, their real name
    /// will be used instead. If no name is available the function will return
    /// None.
    pub fn display_name() -> Option<String> {
        Self::display_name_of(LOCAL_PLAYER_ID)
    }

    /// Returns the id of the currently signed in user.
    ///
    /// This is the Embark external user id and is safe for external users to
    /// know.
    pub fn id() -> Option<UserId> {
        Self::id_of(LOCAL_PLAYER_ID)
    }

    /// Returns the user id of the player with the given `player_id`.
    /// Returns `None` if player is not on server or is not logged in.
    pub fn id_of(player_id: PlayerId) -> Option<UserId> {
        ffi::id_of(player_id)
            .ok()
            .and_then(|bytes| String::from_utf8(bytes).ok().map(UserId))
    }

    /// Returns the display name of the user with the given `player_id`.
    /// Returns `None` if player is not on server or is not logged in.
    pub fn display_name_of(player_id: PlayerId) -> Option<String> {
        ffi::display_name_of(player_id).ok()
    }
}