use matrix_sdk::{Client,
                 ruma::{events::{AnyTimelineEvent}},
                 deserialized_responses::TimelineEvent,
                 room::MessagesOptions};
use anyhow::{Result, Error};
use cli_log::{error, warn, info};

pub enum State {
    None,
    Main,
    Setup,
}

pub struct Room {
    matrix_room: matrix_sdk::room::Joined,
    timeline: Vec<AnyTimelineEvent>,
    timeline_end: Option<String>,
}

pub struct Status {
    state: State,
    account_name: String,
    account_user_id: String,

    client: Option<Client>,
    rooms: Vec<Room>,
    current_room_id: Option<u32>,
}

impl Room {
    pub fn new (matrix_room: matrix_sdk::room::Joined) -> Self {
        Self {
            matrix_room,
            timeline: Vec::new(),
            timeline_end: None,
        }
    }

    pub async fn poll_old_timeline(&mut self) -> Result<()> {
        let mut messages_options = MessagesOptions::backward();
        messages_options = match &self.timeline_end {
            Some(end) => messages_options.from(end.as_str()),
            None => messages_options
        };
        let events = self.matrix_room.messages(messages_options).await?;
        self.timeline_end = events.end;

        for event in events.chunk.iter() {
            self.timeline.insert(0, match event.event.deserialize() {
                Ok(ev) => ev,
                Err(err) => {
                    warn!("Failed to deserialize timeline event - {err}");
                    continue;
                }
            });
        }
        Ok(())
    }

    pub fn timeline_add(&mut self, event: AnyTimelineEvent) {
        self.timeline.push(event);
    }

    pub fn timeline(&self) -> &Vec<AnyTimelineEvent> { &self.timeline }
}

impl Status {
    pub fn new(client: Option<Client>) -> Self {
        let rooms = match &client {
            Some(c) => {
                c.joined_rooms()
                    .iter()
                    .map(|r| {
                        Room::new(r.clone())
                    })
                    .collect::<Vec<_>>()
            },
            None => Vec::new(),
        };

        Self {
            state: State::None,
            account_name: "".to_string(),
            account_user_id: "".to_string(),
            client,
            rooms,
            current_room_id: Some(0),
        }
    }

    pub fn account_name(&self) -> &String {
        &self.account_name
    }

    pub fn set_account_name(&mut self, name: String) {
        self.account_name = name;
    }

    pub fn account_user_id(&self) -> &String {
        &self.account_user_id
    }

    pub fn set_account_user_id(&mut self, user_id: String) {
        self.account_user_id = user_id;
    }

    pub fn room(&self) -> Option<&Room> {
        self.rooms.get(self.current_room_id? as usize)
    }

    pub fn rooms(&self) -> &Vec<Room> {
        &self.rooms
    }

    pub fn rooms_mut(&mut self) -> &mut Vec<Room> {
        &mut self.rooms
    }
    
    pub fn state(&self) -> &State {
        &self.state
    }
    
    pub fn set_state(&mut self, state: State) {
        self.state = state;
    }
}