// client/src/input/keymap.rs

use evdev::KeyCode;

/// Return Some(usage) if we have a known mapping from evdev::KeyCode -> HID usage code
pub fn keycode_to_usage(key: KeyCode) -> Option<u8> {
    match key {
        // Letters
        KeyCode::KEY_A => Some(0x04),
        KeyCode::KEY_B => Some(0x05),
        KeyCode::KEY_C => Some(0x06),
        KeyCode::KEY_D => Some(0x07),
        KeyCode::KEY_E => Some(0x08),
        KeyCode::KEY_F => Some(0x09),
        KeyCode::KEY_G => Some(0x0A),
        KeyCode::KEY_H => Some(0x0B),
        KeyCode::KEY_I => Some(0x0C),
        KeyCode::KEY_J => Some(0x0D),
        KeyCode::KEY_K => Some(0x0E),
        KeyCode::KEY_L => Some(0x0F),
        KeyCode::KEY_M => Some(0x10),
        KeyCode::KEY_N => Some(0x11),
        KeyCode::KEY_O => Some(0x12),
        KeyCode::KEY_P => Some(0x13),
        KeyCode::KEY_Q => Some(0x14),
        KeyCode::KEY_R => Some(0x15),
        KeyCode::KEY_S => Some(0x16),
        KeyCode::KEY_T => Some(0x17),
        KeyCode::KEY_U => Some(0x18),
        KeyCode::KEY_V => Some(0x19),
        KeyCode::KEY_W => Some(0x1A),
        KeyCode::KEY_X => Some(0x1B),
        KeyCode::KEY_Y => Some(0x1C),
        KeyCode::KEY_Z => Some(0x1D),

        // Number row
        KeyCode::KEY_1 => Some(0x1E),
        KeyCode::KEY_2 => Some(0x1F),
        KeyCode::KEY_3 => Some(0x20),
        KeyCode::KEY_4 => Some(0x21),
        KeyCode::KEY_5 => Some(0x22),
        KeyCode::KEY_6 => Some(0x23),
        KeyCode::KEY_7 => Some(0x24),
        KeyCode::KEY_8 => Some(0x25),
        KeyCode::KEY_9 => Some(0x26),
        KeyCode::KEY_0 => Some(0x27),

        // Common punctuation
        KeyCode::KEY_ENTER => Some(0x28),
        KeyCode::KEY_ESC => Some(0x29),
        KeyCode::KEY_BACKSPACE => Some(0x2A),
        KeyCode::KEY_TAB => Some(0x2B),
        KeyCode::KEY_SPACE => Some(0x2C),
        KeyCode::KEY_MINUS => Some(0x2D),
        KeyCode::KEY_EQUAL => Some(0x2E),
        KeyCode::KEY_LEFTBRACE => Some(0x2F),
        KeyCode::KEY_RIGHTBRACE => Some(0x30),
        KeyCode::KEY_BACKSLASH => Some(0x31),
        KeyCode::KEY_SEMICOLON => Some(0x33),
        KeyCode::KEY_APOSTROPHE => Some(0x34),
        KeyCode::KEY_GRAVE => Some(0x35),
        KeyCode::KEY_COMMA => Some(0x36),
        KeyCode::KEY_DOT => Some(0x37),
        KeyCode::KEY_SLASH => Some(0x38),

        // Function keys
        KeyCode::KEY_CAPSLOCK => Some(0x39),
        KeyCode::KEY_F1 => Some(0x3A),
        KeyCode::KEY_F2 => Some(0x3B),
        KeyCode::KEY_F3 => Some(0x3C),
        KeyCode::KEY_F4 => Some(0x3D),
        KeyCode::KEY_F5 => Some(0x3E),
        KeyCode::KEY_F6 => Some(0x3F),
        KeyCode::KEY_F7 => Some(0x40),
        KeyCode::KEY_F8 => Some(0x41),
        KeyCode::KEY_F9 => Some(0x42),
        KeyCode::KEY_F10 => Some(0x43),
        KeyCode::KEY_F11 => Some(0x44),
        KeyCode::KEY_F12 => Some(0x45),

        // We'll handle modifiers (ctrl, shift, alt, meta) in `is_modifier()`
        _ => None,
    }
}

/// If a key is a modifier, return the bit(s) to set in HID byte[0].
pub fn is_modifier(key: KeyCode) -> Option<u8> {
    match key {
        KeyCode::KEY_LEFTCTRL  => Some(0x01),
        KeyCode::KEY_LEFTSHIFT => Some(0x02),
        KeyCode::KEY_LEFTALT   => Some(0x04),
        KeyCode::KEY_LEFTMETA  => Some(0x08),
        KeyCode::KEY_RIGHTCTRL => Some(0x10),
        KeyCode::KEY_RIGHTSHIFT => Some(0x20),
        KeyCode::KEY_RIGHTALT  => Some(0x40),
        KeyCode::KEY_RIGHTMETA => Some(0x80),
        _ => None,
    }
}