use serde::{Deserialize, Serialize};
use tetratto_shared::{snow::Snowflake, unix_epoch_timestamp};

#[derive(Serialize, Deserialize, PartialEq, Eq)]
pub struct GroupChatInfo {
    pub name: String,
}

#[derive(Serialize, Deserialize, PartialEq, Eq)]
pub enum ChatStyle {
    /// Direct messages between two users.
    Direct,
    /// Messages between a group of users (up to 10).
    Group(GroupChatInfo),
}

#[derive(Serialize, Deserialize)]
pub struct Chat {
    pub id: usize,
    pub created: usize,
    pub style: ChatStyle,
    /// When the last member of the chat leaves, the chat will be deleted.
    pub members: Vec<usize>,
    pub last_message_created: usize,
    /// The IDs of each user in the chat who read the last message.
    ///
    /// Will always have the ID of the user who sent the last message as index 0.
    ///
    /// The UI should show two checkmarks once this vector has a length of at least 2.
    ///
    /// Read receipts are stored by chat instead of message since it's easier to
    /// keep up with if we store by chat instead. This will also declutter
    /// the UI and prevent every message showing a read receipt.
    pub last_message_read_by: Vec<usize>,
}

impl Chat {
    /// Create a new [`Chat`].
    pub fn new(style: ChatStyle, members: Vec<usize>) -> Self {
        Self {
            id: Snowflake::new().to_string().parse::<usize>().unwrap(),
            created: unix_epoch_timestamp(),
            style,
            members,
            last_message_created: 0,
            last_message_read_by: Vec::new(),
        }
    }
}

#[derive(Serialize, Deserialize)]
pub struct Message {
    pub id: usize,
    pub created: usize,
    pub edited: usize,
    pub owner: usize,
    pub chat: usize,
    pub content: String,
    pub uploads: Vec<usize>,
}

impl Message {
    /// Create a new [`Message`].
    pub fn new(owner: usize, chat: usize, content: String, uploads: Vec<usize>) -> Self {
        let created = unix_epoch_timestamp();

        Self {
            id: Snowflake::new().to_string().parse::<usize>().unwrap(),
            created,
            edited: created,
            owner,
            chat,
            content,
            uploads,
        }
    }
}