use crate::*;

impl Handle<TuiIn> for Taggart {
    fn handle (&mut self, input: &TuiIn) -> Perhaps<bool> {
        Ok(match &*input.event() {
            Event::Key(KeyEvent {
                code:      KeyCode::Up,
                kind:      KeyEventKind::Press,
                modifiers: KeyModifiers::NONE,
                state:     KeyEventState::NONE
            }) => {
                self.cursor = self.cursor.saturating_sub(1);
                None
            },
            Event::Key(KeyEvent {
                code:      KeyCode::Down,
                kind:      KeyEventKind::Press,
                modifiers: KeyModifiers::NONE,
                state:     KeyEventState::NONE
            }) => {
                self.cursor = self.cursor + 1;
                None
            },
            Event::Key(KeyEvent {
                code:      KeyCode::PageUp,
                kind:      KeyEventKind::Press,
                modifiers: KeyModifiers::NONE,
                state:     KeyEventState::NONE
            }) => {
                self.offset = self.offset.saturating_sub(5);
                None
            },
            Event::Key(KeyEvent {
                code:      KeyCode::PageDown,
                kind:      KeyEventKind::Press,
                modifiers: KeyModifiers::NONE,
                state:     KeyEventState::NONE
            }) => {
                self.offset += 5;
                None
            },
            _ => None
        })
    }
}

#[moku::state_machine]
mod taggart {
    use moku::*;
    #[machine_module] mod machine {}
    use self::machine::{TaggartState, TopSuperstates};
    struct Top;
    impl TopState<TaggartState> for Top {}
    struct Tree(usize);
    #[superstate(Top)] impl State<TaggartState> for Tree {
        fn enter (_: &mut TopSuperstates<'_>) -> StateEntry<Self, TaggartState> {
            StateEntry::State(Self(0))
        }
    }
    struct File(usize);
    #[superstate(Top)] impl State<TaggartState> for File {
        fn enter (_: &mut TopSuperstates<'_>) -> StateEntry<Self, TaggartState> {
            StateEntry::State(Self(0))
        }
    }
}