#[derive(Clone, Copy, PartialEq, Eq, Default)]
pub enum PatternsColumn {
    #[default]
    Banks,
    Patterns,
}

#[derive(Clone, Copy, Default)]
pub struct PatternsNav {
    pub column: PatternsColumn,
    pub bank_cursor: usize,
    pub pattern_cursor: usize,
}

impl PatternsNav {
    pub fn move_left(&mut self) {
        self.column = PatternsColumn::Banks;
    }

    pub fn move_right(&mut self) {
        self.column = PatternsColumn::Patterns;
    }

    pub fn move_up(&mut self) {
        match self.column {
            PatternsColumn::Banks => {
                self.bank_cursor = (self.bank_cursor + 15) % 16;
            }
            PatternsColumn::Patterns => {
                self.pattern_cursor = (self.pattern_cursor + 15) % 16;
            }
        }
    }

    pub fn move_down(&mut self) {
        match self.column {
            PatternsColumn::Banks => {
                self.bank_cursor = (self.bank_cursor + 1) % 16;
            }
            PatternsColumn::Patterns => {
                self.pattern_cursor = (self.pattern_cursor + 1) % 16;
            }
        }
    }

    pub fn selected_bank(&self) -> usize {
        self.bank_cursor
    }

    pub fn selected_pattern(&self) -> usize {
        self.pattern_cursor
    }
}