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//! Key constants

/// Input key pressed
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
#[non_exhaustive]
pub enum KeyPress {
    /// Unsupported escape sequence (on unix platform)
    UnknownEscSeq,
    /// ⌫ or `KeyPress::Ctrl('H')`
    Backspace,
    /// ⇤ (usually Shift-Tab)
    BackTab,
    /// Paste (on unix platform)
    BracketedPasteStart,
    /// Paste (on unix platform)
    BracketedPasteEnd,
    /// Single char
    Char(char),
    /// Ctrl-↓
    ControlDown,
    /// Ctrl-←
    ControlLeft,
    /// Ctrl-→
    ControlRight,
    /// Ctrl-↑
    ControlUp,
    /// Ctrl-char
    Ctrl(char),
    /// ⌦
    Delete,
    /// ↓ arrow key
    Down,
    /// ⇲
    End,
    /// ↵ or `KeyPress::Ctrl('M')`
    Enter,
    /// Escape or `KeyPress::Ctrl('[')`
    Esc,
    /// Function key
    F(u8),
    /// ⇱
    Home,
    /// Insert key
    Insert,
    /// ← arrow key
    Left,
    /// Escape-char or Alt-char
    Meta(char),
    /// `KeyPress::Char('\0')`
    Null,
    /// ⇟
    PageDown,
    /// ⇞
    PageUp,
    /// → arrow key
    Right,
    /// Shift-↓
    ShiftDown,
    /// Shift-←
    ShiftLeft,
    /// Shift-→
    ShiftRight,
    /// Shift-↑
    ShiftUp,
    /// ⇥ or `KeyPress::Ctrl('I')`
    Tab,
    /// ↑ arrow key
    Up,
}

#[cfg(any(windows, unix))]
pub fn char_to_key_press(c: char) -> KeyPress {
    if !c.is_control() {
        return KeyPress::Char(c);
    }
    #[allow(clippy::match_same_arms)]
    match c {
        '\x00' => KeyPress::Ctrl(' '),
        '\x01' => KeyPress::Ctrl('A'),
        '\x02' => KeyPress::Ctrl('B'),
        '\x03' => KeyPress::Ctrl('C'),
        '\x04' => KeyPress::Ctrl('D'),
        '\x05' => KeyPress::Ctrl('E'),
        '\x06' => KeyPress::Ctrl('F'),
        '\x07' => KeyPress::Ctrl('G'),
        '\x08' => KeyPress::Backspace, // '\b'
        '\x09' => KeyPress::Tab,       // '\t'
        '\x0a' => KeyPress::Ctrl('J'), // '\n' (10)
        '\x0b' => KeyPress::Ctrl('K'),
        '\x0c' => KeyPress::Ctrl('L'),
        '\x0d' => KeyPress::Enter, // '\r' (13)
        '\x0e' => KeyPress::Ctrl('N'),
        '\x0f' => KeyPress::Ctrl('O'),
        '\x10' => KeyPress::Ctrl('P'),
        '\x12' => KeyPress::Ctrl('R'),
        '\x13' => KeyPress::Ctrl('S'),
        '\x14' => KeyPress::Ctrl('T'),
        '\x15' => KeyPress::Ctrl('U'),
        '\x16' => KeyPress::Ctrl('V'),
        '\x17' => KeyPress::Ctrl('W'),
        '\x18' => KeyPress::Ctrl('X'),
        '\x19' => KeyPress::Ctrl('Y'),
        '\x1a' => KeyPress::Ctrl('Z'),
        '\x1b' => KeyPress::Esc, // Ctrl-[
        '\x1c' => KeyPress::Ctrl('\\'),
        '\x1d' => KeyPress::Ctrl(']'),
        '\x1e' => KeyPress::Ctrl('^'),
        '\x1f' => KeyPress::Ctrl('_'),
        '\x7f' => KeyPress::Backspace, // Rubout
        _ => KeyPress::Null,
    }
}

#[cfg(test)]
mod tests {
    use super::{char_to_key_press, KeyPress};

    #[test]
    fn char_to_key() {
        assert_eq!(KeyPress::Esc, char_to_key_press('\x1b'));
    }
}