use crate::prelude::*;
use super::*;
pub fn handle (state: &mut Launcher, event: &AppEvent) -> Usually<bool> {
    Ok(handle_keymap(state, event, KEYMAP)? || match state.view {
        LauncherView::Modal(ref mut device) => {
            device.handle(event)?
        },
        LauncherView::Tracks => {
            handle_keymap(state, event, KEYMAP_TRACKS)?
        },
        LauncherView::Sequencer => {
            let i = state.col().saturating_sub(1);
            if let Some(track) = state.tracks.get_mut(i) {
                crate::device::sequencer::handle(&mut *track.sequencer.state(), event)?
            } else {
                true
            }
        },
        LauncherView::Chains => {
            let i = state.col().saturating_sub(1);
            if let Some(track) = state.tracks.get_mut(i) {
                crate::device::chain::handle(&mut *track.chain.state(), event)?
            } else {
                true
            }
        }
    })
}
pub const KEYMAP: &'static [KeyBinding<Launcher>] = keymap!(Launcher {
    [F(1),      NONE,    "toggle_help",    "toggle help",             toggle_help],
    [Tab,       SHIFT,   "focus_prev",     "focus previous area",     focus_prev],
    [Tab,       NONE,    "focus_next",     "focus next area",         focus_next],
    [Char(' '), NONE,    "play_toggle",    "play or pause",           play_toggle],
    [Char('r'), NONE,    "record_toggle",  "toggle recording",        record_toggle],
    [Char('d'), NONE,    "overdub_toggle", "toggle overdub",          overdub_toggle],
    [Char('m'), NONE,    "monitor_toggle", "toggle input monitoring", monitor_toggle],
    [Char('r'), CONTROL, "rename",         "rename current element",  rename],
    [Char('t'), CONTROL, "add_track",      "add a new track",         add_track],
    //[Char(' '), SHIFT, "play_start",   "play from start",        play_start],
});
pub const KEYMAP_TRACKS: &'static [KeyBinding<Launcher>] = keymap!(Launcher {
    [Up,        NONE,    "cursor_up",      "move cursor up",           cursor_up],
    [Down,      NONE,    "cursor_down",    "move cursor down",         cursor_down],
    [Left,      NONE,    "cursor_left",    "move cursor left",         cursor_left],
    [Right,     NONE,    "cursor_right",   "move cursor right",        cursor_right],
    [Char('.'), NONE,    "clip_next",      "set clip to next phrase",  clip_next],
    [Char(','), NONE,    "clip_prev",      "set clip to last phrase",  clip_prev],
    [Delete,    CONTROL, "delete_track",   "delete track",             delete_track],
    [Char('d'), CONTROL, "duplicate",      "duplicate scene or track", duplicate],
    [Enter,     NONE,    "clip_enter",     "play or record clip or stop and advance", clip_enter],
});
fn duplicate (_: &mut Launcher) -> Usually<bool> {
    Ok(true)
}
fn clip_enter (_: &mut Launcher) -> Usually<bool> {
    //let track = state.active_track().unwrap();
    //let scene = state.active_scene();
    //if state.cursor.1 >= 2 {
        //if let Some(Some(index)) = scene.clips.get(state.cursor.1 - 2) {
            //track.enqueue(index)
        //} else {
        //}
    //}
    //if state.cursor.0 >= 1 {
        //let sequencer = state.tracks.get_mut(state.cursor.0 - 1);
        //if state.cursor.1 >= 2 {
            //let scene = state.scenes.get_mut(state.cursor.1 - 2);
            //if let Some(index) = scene.get(state.cursor.0 - 1) {
                //let phrase = sequencer.phrases.get(index);
            //} else {
                //let index  = sequencer.phrases.len();
                //let phrase = Phrase::new(&format!("Phrase#{index}"));
                //sequencer.phrases.push(phrase);
                //scene[state.cursor.0 - 1] = Some(index);
            //}
        //}
    //}
    Ok(true)
}
fn rename (_: &mut Launcher) -> Usually<bool> {
    Ok(true)
}
fn add_track (state: &mut Launcher) -> Usually<bool> {
    let name = format!("Track {}", state.tracks.len() + 1);
    state.tracks.push(Track::new(&name, &state.timebase, None, None)?);
    state.cursor.0 = state.tracks.len();
    Ok(true)
}
fn delete_track (state: &mut Launcher) -> Usually<bool> {
    if state.tracks.len() > 0 && state.cursor.0 >= 1 {
        state.tracks.remove(state.cursor.0 - 1);
        state.cursor.0 = state.cursor.0.min(state.tracks.len());
    }
    Ok(true)
}
fn cursor_up (state: &mut Launcher) -> Usually<bool> {
    state.dec_row();
    Ok(true)
}
fn cursor_down (state: &mut Launcher) -> Usually<bool> {
    state.inc_row();
    Ok(true)
}
fn cursor_left (state: &mut Launcher) -> Usually<bool> {
    state.dec_col();
    Ok(true)
}
fn cursor_right (state: &mut Launcher) -> Usually<bool> {
    state.inc_col();
    Ok(true)
}
fn toggle_help (state: &mut Launcher) -> Usually<bool> {
    state.show_help = !state.show_help;
    Ok(true)
}
fn focus_next (state: &mut Launcher) -> Usually<bool> {
    match state.view {
        LauncherView::Tracks    => { state.view = LauncherView::Sequencer; },
        LauncherView::Sequencer => { state.view = LauncherView::Chains;    },
        LauncherView::Chains    => { state.view = LauncherView::Tracks;    },
        _ => {},
    };
    Ok(true)
}
fn focus_prev (state: &mut Launcher) -> Usually<bool> {
    match state.view {
        LauncherView::Tracks    => { state.view = LauncherView::Chains;    },
        LauncherView::Chains    => { state.view = LauncherView::Sequencer; },
        LauncherView::Sequencer => { state.view = LauncherView::Tracks;    },
        _ => {},
    };
    Ok(true)
}
fn clip_next (state: &mut Launcher) -> Usually<bool> {
    if state.cursor.0 >= 1 && state.cursor.1 >= 1 {
        let scene_id = state.cursor.1 - 1;
        let clip_id  = state.cursor.0 - 1;
        let scene = &mut state.scenes[scene_id];
        scene.clips[clip_id] = match scene.clips[clip_id] {
            None => Some(0),
            Some(i) => if i >= state.tracks[clip_id].sequencer.state().sequences.len().saturating_sub(1) {
                None
            } else {
                Some(i + 1)
            }
        };
    }
    Ok(true)
}
fn clip_prev (state: &mut Launcher) -> Usually<bool> {
    if state.cursor.0 >= 1 && state.cursor.1 >= 1 {
        let scene_id = state.cursor.1 - 1;
        let clip_id  = state.cursor.0 - 1;
        let scene = &mut state.scenes[scene_id];
        scene.clips[clip_id] = match scene.clips[clip_id] {
            None => Some(state.tracks[clip_id].sequencer.state().sequences.len().saturating_sub(1)),
            Some(i) => if i == 0 {
                None
            } else {
                Some(i - 1)
            }
        };
    }
    Ok(true)
}
fn play_toggle (s: &mut Launcher) -> Usually<bool> {
    s.playing = match s.playing {
        TransportState::Stopped => {
            s.transport.start()?;
            TransportState::Starting
        },
        _ => {
            s.transport.stop()?;
            s.transport.locate(0)?;
            TransportState::Stopped
        },
    };
    Ok(true)
}
//fn play_start (_: &mut Launcher) -> Usually<bool> {
    //unimplemented!()
//}
fn record_toggle (s: &mut Launcher) -> Usually<bool> {
    s.recording = !s.recording;
    for track in s.tracks.iter() {
        track.sequencer.state().recording = s.recording;
    }
    Ok(true)
}
fn overdub_toggle (s: &mut Launcher) -> Usually<bool> {
    s.overdub = !s.overdub;
    for track in s.tracks.iter() {
        track.sequencer.state().overdub = s.overdub;
    }
    Ok(true)
}
fn monitor_toggle (s: &mut Launcher) -> Usually<bool> {
    s.monitoring = !s.monitoring;
    for track in s.tracks.iter() {
        track.sequencer.state().monitoring = s.monitoring;
    }
    Ok(true)
}