use crate::*;

#[derive(Copy, Clone, PartialEq)]
pub enum TransportViewCommand {
    Focus(FocusCommand),
    Transport(TransportCommand),
}

impl Handle<Tui> for TransportView<Tui> {
    fn handle (&mut self, from: &TuiInput) -> Perhaps<bool> {
        TransportViewCommand::execute_with_state(self, from)
    }
}

impl InputToCommand<Tui, TransportView<Tui>> for TransportViewCommand {
    fn input_to_command (state: &TransportView<Tui>, input: &TuiInput) -> Option<Self> {
        use TransportViewFocus as Focus;
        use FocusCommand as FocusCmd;
        use TransportCommand as Cmd;
        Some(match input.event() {

            key!(KeyCode::Left)  => Self::Focus(FocusCmd::Prev),
            key!(KeyCode::Right) => Self::Focus(FocusCmd::Next),

            key!(KeyCode::Char('.')) => Self::Transport(match state.focus {
                Focus::Bpm       => Cmd::SetBpm(state.state.clock.timebase().bpm.get() + 1.0),
                Focus::Quant     => Cmd::SetQuant(next_note_length(state.state.clock.quant.get()as usize)as f64),
                Focus::Sync      => Cmd::SetSync(next_note_length(state.state.clock.sync.get()as usize)as f64+1.),
                Focus::PlayPause => {todo!()},
                Focus::Clock     => {todo!()}
            }),
            key!(KeyCode::Char(',')) => Self::Transport(match state.focus {
                Focus::Bpm       => Cmd::SetBpm(state.state.clock.timebase().bpm.get() - 1.0),
                Focus::Quant     => Cmd::SetQuant(prev_note_length(state.state.clock.quant.get()as usize)as f64),
                Focus::Sync      => Cmd::SetSync(prev_note_length(state.state.clock.sync.get()as usize)as f64+1.),
                Focus::PlayPause => {todo!()},
                Focus::Clock     => {todo!()}
            }),
            key!(KeyCode::Char('>')) => Self::Transport(match state.focus {
                Focus::Bpm       => Cmd::SetBpm(state.state.clock.timebase().bpm.get() + 0.001),
                Focus::Quant     => Cmd::SetQuant(next_note_length(state.state.clock.quant.get()as usize)as f64),
                Focus::Sync      => Cmd::SetSync(next_note_length(state.state.clock.sync.get()as usize)as f64+1.),
                Focus::PlayPause => {todo!()},
                Focus::Clock     => {todo!()}
            }),
            key!(KeyCode::Char('<')) => Self::Transport(match state.focus {
                Focus::Bpm       => Cmd::SetBpm(state.state.clock.timebase().bpm.get() - 0.001),
                Focus::Quant     => Cmd::SetQuant(prev_note_length(state.state.clock.quant.get()as usize)as f64),
                Focus::Sync      => Cmd::SetSync(prev_note_length(state.state.clock.sync.get()as usize)as f64+1.),
                Focus::PlayPause => {todo!()},
                Focus::Clock     => {todo!()}
            }),

            _ => return None
        })
    }
}

impl<E: Engine> Command<TransportView<E>> for TransportViewCommand {
    fn execute (self, state: &mut TransportView<E>) -> Perhaps<Self> {
        Ok(Some(match self {
            Self::Focus(command) => Self::Focus({
                use FocusCommand::*;
                match command {
                    Next => { todo!() },
                    Prev => { todo!() },
                    _ => { todo!() }
                }
            }),
            Self::Transport(command) => Self::Transport({
                use TransportCommand::*;
                match command {
                    SetBpm(bpm)     => SetBpm(state.state.clock.timebase().bpm.set(bpm)),
                    SetQuant(quant) => SetQuant(state.state.clock.quant.set(quant)),
                    SetSync(sync)   => SetSync(state.state.clock.sync.set(sync)),
                    _ => { todo!() }
                }
            }),
        }))
    }
}