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use crate::config::WiserConfig;
use crate::io::dummy::DummyIO;
use crate::io::wiser::hub::FROM_SCHEDULE_ORIGIN;
use crate::io::wiser::WiserManager;
use crate::wiser::hub::{RetrieveDataError, WiserData, WiserDataSystem, WiserRoomData};
use crate::{io, WiserHub};
use async_trait::async_trait;
use chrono::{DateTime, Duration, Utc};
use std::borrow::BorrowMut;
use std::cell::RefCell;
use std::sync::mpsc::Receiver;
use std::sync::Mutex;

pub enum ModifyState {
    SetHeatingOffTime(DateTime<Utc>),
    TurnOffHeating,
}

pub struct Dummy {
    receiver: Mutex<Receiver<ModifyState>>,
    heating_off_time: Mutex<RefCell<Option<DateTime<Utc>>>>,
    hub: DummyHub,
}

#[async_trait]
impl WiserManager for Dummy {
    async fn get_heating_turn_off_time(&self) -> Option<DateTime<Utc>> {
        self.update_state();
        (*self.heating_off_time.lock().unwrap()).borrow().clone()
    }

    async fn get_heating_on(&self) -> Result<bool, ()> {
        self.update_state();
        Ok((*self.heating_off_time.lock().unwrap()).borrow().is_some())
    }

    fn get_wiser_hub(&self) -> &dyn WiserHub {
        &self.hub
    }
}

impl DummyIO for Dummy {
    type MessageType = ModifyState;
    type Config = WiserConfig;

    fn new(receiver: Receiver<Self::MessageType>, _config: &Self::Config) -> Self {
        Dummy {
            receiver: Mutex::new(receiver),
            heating_off_time: Mutex::new(RefCell::new(None)),
            hub: DummyHub {
                wiser_data: WiserData::new(
                    WiserDataSystem::new(Utc::now().timestamp() as u64),
                    vec![WiserRoomData::new(
                        1,
                        None,
                        None,
                        None,
                        FROM_SCHEDULE_ORIGIN.to_owned(),
                        175,
                        210,
                        Some("Jimmy's Room".to_owned()),
                    )],
                ),
            },
        }
    }
}

impl Dummy {
    fn update_state(&self) {
        let guard = self.receiver.lock().unwrap();
        io::dummy::read_all(&*guard, |message| {
            match message {
                ModifyState::SetHeatingOffTime(when) => self
                    .heating_off_time
                    .lock()
                    .unwrap()
                    .borrow_mut()
                    .replace(Some(when)),
                ModifyState::TurnOffHeating => self
                    .heating_off_time
                    .lock()
                    .unwrap()
                    .borrow_mut()
                    .replace(None),
            };
        })
    }
}

pub struct DummyHub {
    wiser_data: WiserData,
}

#[async_trait]
impl WiserHub for DummyHub {
    async fn get_data(&self) -> Result<WiserData, RetrieveDataError> {
        Ok(self.wiser_data.clone())
    }

    async fn get_room_data(&self) -> Result<Vec<WiserRoomData>, RetrieveDataError> {
        Ok(self.wiser_data.get_rooms().clone())
    }

    async fn cancel_boost(
        &self,
        room_id: usize,
        _originator: String,
    ) -> Result<(), Box<dyn std::error::Error>> {
        println!("Dummy: Cancelling boost in room: {}", room_id);
        Ok(())
    }

    async fn set_boost(
        &self,
        room_id: usize,
        duration_minutes: usize,
        temp: f32,
        originator: String,
    ) -> Result<(f32, DateTime<Utc>), Box<dyn std::error::Error>> {
        println!(
            "Dummy: Set boost in room: {} for {} minutes, at temp {}, caused by: {}",
            room_id, duration_minutes, temp, originator
        );
        Ok((
            temp,
            Utc::now() + Duration::seconds(60 * duration_minutes as i64),
        ))
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::sync::mpsc::Sender;

    #[tokio::test]
    async fn dummy_starts_off() {
        let (wiser, _sender) = Dummy::create(&WiserConfig::fake());
        assert_eq!(
            wiser.get_heating_on().await,
            Ok(false),
            "Dummy should start off"
        );
        assert_eq!(
            wiser.get_heating_turn_off_time().await,
            None,
            "Dummy should start with empty off time since it starts off"
        )
    }

    #[tokio::test]
    async fn dummy_turn_on() {
        let off_time = Utc::now() + chrono::Duration::seconds(1234);
        let (wiser, _sender) = get_on_dummy_with_off_time(off_time);
        assert_eq!(wiser.get_heating_on().await, Ok(true), "Should now be on");
        assert_eq!(
            wiser.get_heating_turn_off_time().await,
            Some(off_time),
            "Should have the same off time as what was set."
        );

        let (wiser, _sender) = get_on_dummy_with_off_time(off_time);
        assert_eq!(
            wiser.get_heating_turn_off_time().await,
            Some(off_time),
            "Getting off time should act the same even when called first"
        );
        assert_eq!(
            wiser.get_heating_on().await,
            Ok(true),
            "Getting whether heating is on should act the same even when called second"
        );
    }

    fn get_on_dummy_with_off_time(off_time: DateTime<Utc>) -> (Dummy, Sender<ModifyState>) {
        let (wiser, sender) = Dummy::create(&WiserConfig::fake());
        sender
            .send(ModifyState::SetHeatingOffTime(off_time.clone()))
            .expect("Should be able to send message");
        return (wiser, sender);
    }
}