pub mod app;
mod routes;

use crate::{
    channel,
    event::{Instant, Sequence},
    login::Login,
    message,
};

pub use self::routes::router;

#[derive(serde::Serialize)]
pub struct Snapshot {
    pub resume_point: Sequence,
    pub channels: Vec<Channel>,
}

#[derive(serde::Serialize)]
pub struct Channel {
    pub id: channel::Id,
    pub name: String,
    pub messages: Vec<Message>,
}

impl Channel {
    fn new(
        channel: channel::Channel,
        messages: impl IntoIterator<Item = message::Message>,
    ) -> Self {
        // The declarations are like this to guarantee that we aren't omitting any important fields from the corresponding types.
        let channel::Channel { id, name } = channel;

        Self {
            id,
            name,
            messages: messages.into_iter().map(Message::from).collect(),
        }
    }
}

#[derive(serde::Serialize)]
pub struct Message {
    #[serde(flatten)]
    pub sent: Instant,
    pub sender: Login,
    // Named this way for serialization reasons
    #[allow(clippy::struct_field_names)]
    pub message: Body,
}

impl From<message::Message> for Message {
    fn from(message: message::Message) -> Self {
        let message::Message {
            sent,
            channel: _,
            sender,
            id,
            body,
        } = message;

        Self {
            sent,
            sender,
            message: Body { id, body },
        }
    }
}

#[derive(serde::Serialize)]
pub struct Body {
    id: message::Id,
    body: String,
}