use crate::broadcast_messages::{BroadcastMessage, BroadcastSender};
use crate::matrix_connection::matrix_client::MatrixClient;
use crate::matrix_connection::sync_thread::{MatrixSyncTaskID, start_sync_thread};
use crate::users::UserEmail;
use ractor::{Actor, ActorProcessingErr, ActorRef, RpcReplyPort};
use std::collections::HashMap;

pub struct MatrixManagerState {
    pub broadcast_sender: BroadcastSender,
    pub clients: HashMap<UserEmail, MatrixClient>,
    pub running_sync_threads: HashMap<UserEmail, MatrixSyncTaskID>,
}

pub enum MatrixManagerMsg {
    GetClient(UserEmail, RpcReplyPort<anyhow::Result<MatrixClient>>),
    DisconnectClient(UserEmail),
    StartSyncThread(UserEmail),
    StopSyncThread(UserEmail),
    SyncThreadGetStatus(UserEmail, RpcReplyPort<bool>),
    SyncThreadTerminated(UserEmail, MatrixSyncTaskID),
}

pub struct MatrixManagerActor;

impl Actor for MatrixManagerActor {
    type Msg = MatrixManagerMsg;
    type State = MatrixManagerState;
    type Arguments = BroadcastSender;

    async fn pre_start(
        &self,
        _myself: ActorRef<Self::Msg>,
        args: Self::Arguments,
    ) -> Result<Self::State, ActorProcessingErr> {
        Ok(MatrixManagerState {
            broadcast_sender: args,
            clients: HashMap::new(),
            running_sync_threads: Default::default(),
        })
    }

    async fn post_stop(
        &self,
        _myself: ActorRef<Self::Msg>,
        _state: &mut Self::State,
    ) -> Result<(), ActorProcessingErr> {
        log::error!("[!] [!] Matrix Manager Actor stopped!");
        Ok(())
    }

    async fn handle(
        &self,
        myself: ActorRef<Self::Msg>,
        message: Self::Msg,
        state: &mut Self::State,
    ) -> Result<(), ActorProcessingErr> {
        match message {
            // Get client information
            MatrixManagerMsg::GetClient(email, port) => {
                let res = port.send(match state.clients.get(&email) {
                    None => {
                        // Generate client if required
                        log::info!("Building new client for {:?}", &email);
                        match MatrixClient::build_client(myself, &email).await {
                            Ok(c) => {
                                state.clients.insert(email.clone(), c.clone());
                                Ok(c)
                            }
                            Err(e) => Err(e),
                        }
                    }
                    Some(c) => Ok(c.clone()),
                });

                if let Err(e) = res {
                    log::warn!("Failed to send client information: {e}")
                }
            }
            MatrixManagerMsg::DisconnectClient(email) => {
                if let Some(c) = state.clients.remove(&email) {
                    // Stop sync thread (if running)
                    if let Some(id) = state.running_sync_threads.remove(&email) {
                        state
                            .broadcast_sender
                            .send(BroadcastMessage::StopSyncThread(id))
                            .ok();
                    }

                    // Disconnect client
                    if let Err(e) = c.disconnect().await {
                        log::error!("Failed to disconnect client: {e}");
                    }
                    if let Err(e) = state
                        .broadcast_sender
                        .send(BroadcastMessage::UserDisconnectedFromMatrix(email))
                    {
                        log::warn!(
                            "Failed to notify that user has been disconnected from Matrix! {e}"
                        );
                    }
                }
            }
            MatrixManagerMsg::StartSyncThread(email) => {
                // Do nothing if task is already running
                if state.running_sync_threads.contains_key(&email) {
                    log::debug!("Not starting sync thread for {email:?} as it is already running");
                    return Ok(());
                }

                let Some(client) = state.clients.get(&email) else {
                    log::warn!(
                        "Cannot start sync thread for {email:?} because client is not initialized!"
                    );
                    return Ok(());
                };

                if !client.is_client_connected() {
                    log::warn!(
                        "Cannot start sync thread for {email:?} because Matrix account is not set!"
                    );
                    return Ok(());
                }

                // Start thread
                log::debug!("Starting sync thread for {email:?}");
                let thread_id =
                    match start_sync_thread(client.clone(), state.broadcast_sender.clone(), myself)
                        .await
                    {
                        Ok(thread_id) => thread_id,
                        Err(e) => {
                            log::error!("Failed to start sync thread! {e}");
                            return Ok(());
                        }
                    };
                state.running_sync_threads.insert(email, thread_id);
            }
            MatrixManagerMsg::StopSyncThread(email) => {
                if let Some(thread_id) = state.running_sync_threads.get(&email)
                    && let Err(e) = state
                        .broadcast_sender
                        .send(BroadcastMessage::StopSyncThread(thread_id.clone()))
                {
                    log::error!("Failed to request sync thread stop: {e}");
                }
            }
            MatrixManagerMsg::SyncThreadGetStatus(email, reply) => {
                let started = state.running_sync_threads.contains_key(&email);
                if let Err(e) = reply.send(started) {
                    log::error!("Failed to send sync thread status! {e}");
                }
            }
            MatrixManagerMsg::SyncThreadTerminated(email, task_id) => {
                if state.running_sync_threads.get(&email) == Some(&task_id) {
                    log::info!(
                        "Sync thread {task_id:?} has been terminated, removing it from the list..."
                    );
                    state.running_sync_threads.remove(&email);
                }
            }
        }
        Ok(())
    }
}