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use serde::Serialize;
use twilight_model::{
    gateway::presence::{Activity, ClientStatus, Presence, Status},
    id::{
        marker::{GuildMarker, UserMarker},
        Id,
    },
};

/// Represents a cached [`Presence`].
///
/// [`Presence`]: twilight_model::gateway::presence::Presence
#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
pub struct CachedPresence {
    pub(crate) activities: Vec<Activity>,
    pub(crate) client_status: ClientStatus,
    pub(crate) guild_id: Id<GuildMarker>,
    pub(crate) status: Status,
    pub(crate) user_id: Id<UserMarker>,
}

impl CachedPresence {
    /// Current activities.
    pub fn activities(&self) -> &[Activity] {
        &self.activities
    }

    /// Platform-dependent status.
    pub const fn client_status(&self) -> &ClientStatus {
        &self.client_status
    }

    /// ID of the guild.
    pub const fn guild_id(&self) -> Id<GuildMarker> {
        self.guild_id
    }

    /// Status of the user.
    pub const fn status(&self) -> Status {
        self.status
    }

    /// ID of the user.
    pub const fn user_id(&self) -> Id<UserMarker> {
        self.user_id
    }

    /// Construct a cached presence from its [`twilight_model`] form.
    #[allow(clippy::missing_const_for_fn)]
    pub(crate) fn from_model(presence: Presence) -> Self {
        let Presence {
            activities,
            client_status,
            guild_id,
            status,
            user,
        } = presence;

        Self {
            activities,
            client_status,
            guild_id,
            status,
            user_id: user.id(),
        }
    }
}

impl PartialEq<Presence> for CachedPresence {
    fn eq(&self, other: &Presence) -> bool {
        self.activities == other.activities
            && self.client_status == other.client_status
            && self.guild_id == other.guild_id
            && self.status == other.status
            && self.user_id == other.user.id()
    }
}

impl From<Presence> for CachedPresence {
    fn from(presence: Presence) -> Self {
        Self::from_model(presence)
    }
}

#[cfg(test)]
mod tests {
    use super::CachedPresence;
    use serde::Serialize;
    use static_assertions::{assert_fields, assert_impl_all};
    use std::fmt::Debug;
    use twilight_model::gateway::presence::Presence;

    assert_fields!(
        CachedPresence: activities,
        client_status,
        guild_id,
        status,
        user_id
    );
    assert_impl_all!(
        CachedPresence: Clone,
        Debug,
        Eq,
        From<Presence>,
        PartialEq,
        PartialEq<Presence>,
        Send,
        Serialize,
        Sync,
    );
}