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use crate::{auth::{Credentials, SASLMechanism}, CloseOnDrop, Connection, ConnectionProperties, PromiseResolver};
use parking_lot::Mutex;
use std::{fmt, sync::Arc};

#[derive(Clone, Default)]
pub struct ConnectionStatus {
    inner: Arc<Mutex<Inner>>,
}

impl ConnectionStatus {
    pub fn state(&self) -> ConnectionState {
        self.inner.lock().state.clone()
    }

    pub(crate) fn set_state(&self, state: ConnectionState) {
        self.inner.lock().state = state
    }

    pub fn vhost(&self) -> String {
        self.inner.lock().vhost.clone()
    }

    pub(crate) fn set_vhost(&self, vhost: &str) {
        self.inner.lock().vhost = vhost.into();
    }

    pub fn username(&self) -> String {
        self.inner.lock().username.clone()
    }

    pub(crate) fn set_username(&self, username: &str) {
        self.inner.lock().username = username.into();
    }

    pub(crate) fn block(&self) {
        self.inner.lock().blocked = true;
    }

    pub(crate) fn unblock(&self) {
        self.inner.lock().blocked = false;
    }

    pub fn blocked(&self) -> bool {
        self.inner.lock().blocked
    }

    pub fn connected(&self) -> bool {
        self.inner.lock().state == ConnectionState::Connected
    }

    pub fn closing(&self) -> bool {
        self.inner.lock().state == ConnectionState::Closing
    }

    pub fn closed(&self) -> bool {
        self.inner.lock().state == ConnectionState::Closed
    }

    pub fn errored(&self) -> bool {
        self.inner.lock().state == ConnectionState::Error
    }
}

#[derive(Clone, Debug)]
pub enum ConnectionState {
    Initial,
    SentProtocolHeader(
        PromiseResolver<CloseOnDrop<Connection>>,
        Connection,
        Credentials,
        SASLMechanism,
        ConnectionProperties,
    ),
    SentStartOk(
        PromiseResolver<CloseOnDrop<Connection>>,
        Connection,
        Credentials,
    ),
    SentOpen(PromiseResolver<CloseOnDrop<Connection>>),
    Connected,
    Closing,
    Closed,
    Error,
}

impl Default for ConnectionState {
    fn default() -> Self {
        ConnectionState::Initial
    }
}

impl PartialEq for ConnectionState {
    fn eq(&self, other: &Self) -> bool {
        match (self, other) {
            (ConnectionState::Initial, ConnectionState::Initial) => true,
            (ConnectionState::SentProtocolHeader(..), ConnectionState::SentProtocolHeader(..)) => {
                true
            }
            (ConnectionState::SentStartOk(..), ConnectionState::SentStartOk(..)) => true,
            (ConnectionState::SentOpen(_), ConnectionState::SentOpen(_)) => true,
            (ConnectionState::Connected, ConnectionState::Connected) => true,
            (ConnectionState::Closing, ConnectionState::Closing) => true,
            (ConnectionState::Closed, ConnectionState::Closed) => true,
            (ConnectionState::Error, ConnectionState::Error) => true,
            _ => false,
        }
    }
}

impl fmt::Debug for ConnectionStatus {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut debug = f.debug_struct("ConnectionStatus");
        if let Some(inner) = self.inner.try_lock() {
            debug
                .field("state", &inner.state)
                .field("vhost", &inner.vhost)
                .field("username", &inner.username)
                .field("blocked", &inner.blocked);
        }
        debug.finish()
    }
}

struct Inner {
    state: ConnectionState,
    vhost: String,
    username: String,
    blocked: bool,
}

impl Default for Inner {
    fn default() -> Self {
        Self {
            state: ConnectionState::default(),
            vhost: "/".into(),
            username: "guest".into(),
            blocked: false,
        }
    }
}