use crate::prelude::*;
use super::Sequencer;

pub fn handle (state: &mut Sequencer, event: &Event) -> Result<(), Box<dyn Error>> {

    if let Event::Input(crossterm::event::Event::Key(event)) = event {

        match event.code {
            KeyCode::Char('c') => {
                if event.modifiers == KeyModifiers::CONTROL {
                    state.exit();
                }
            },
            KeyCode::Down => {
                state.cursor.0 = if state.cursor.0 >= 3 {
                    0
                } else {
                    state.cursor.0 + 1
                }
            },
            KeyCode::Up => {
                state.cursor.0 = if state.cursor.0 == 0 {
                    3
                } else {
                    state.cursor.0 - 1
                }
            },
            KeyCode::Left => {
                state.cursor.1 = if state.cursor.1 == 0 {
                    63
                } else {
                    state.cursor.1 - 1
                }
            },
            KeyCode::Right => {
                state.cursor.1 = if state.cursor.1 == 63 {
                    0
                } else {
                    state.cursor.1 + 1
                }
            },
            KeyCode::Char('[') => {
                if state.cursor.2 > 0 {
                    state.cursor.2 = state.cursor.2 - 1
                }
            },
            KeyCode::Char(']') => {
                state.cursor.2 = state.cursor.2 + 1
            },
            KeyCode::Char('a') => {
                let row      = state.cursor.0 as usize;
                let step     = state.cursor.1 as usize;
                let duration = state.cursor.2 as usize;
                let mut sequence = state.sequence.lock().unwrap();
                sequence[row][step] = Some(super::Event::NoteOn(35, 128));
                if state.cursor.2 > 0 {
                    sequence[row][step + duration] = Some(super::Event::NoteOff(35));
                }
            },
            _ => {
                println!("{event:?}");
            }
        }

    }
    Ok(())
}