#pragma once

#include <cstdint>
#include <optional>
#include <string_view>
#include <vector>

namespace alvin {

// Platform-neutral physical key identifiers. Names follow a US QWERTY layout
// but they identify key *positions*, the same way evdev codes and Win32
// scan codes do. Use Input::typeText() to produce characters instead.
enum class Key : std::uint16_t {
    Unknown = 0,

    A, B, C, D, E, F, G, H, I, J, K, L, M,
    N, O, P, Q, R, S, T, U, V, W, X, Y, Z,

    Num0, Num1, Num2, Num3, Num4, Num5, Num6, Num7, Num8, Num9,

    F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12,
    F13, F14, F15, F16, F17, F18, F19, F20, F21, F22, F23, F24,

    Escape, Enter, Tab, Backspace, Space,
    Minus, Equal, LeftBracket, RightBracket, Backslash,
    Semicolon, Apostrophe, Grave, Comma, Period, Slash,

    CapsLock, NumLock, ScrollLock,
    LeftShift, RightShift, LeftCtrl, RightCtrl, LeftAlt, RightAlt, LeftSuper, RightSuper,
    Menu,

    Insert, Delete, Home, End, PageUp, PageDown,
    Left, Right, Up, Down,
    PrintScreen, Pause,

    Kp0, Kp1, Kp2, Kp3, Kp4, Kp5, Kp6, Kp7, Kp8, Kp9,
    KpDecimal, KpDivide, KpMultiply, KpSubtract, KpAdd, KpEnter,

    VolumeMute, VolumeDown, VolumeUp,
    MediaPlayPause, MediaStop, MediaNext, MediaPrevious,

    Count_,
};

enum class MouseButton : std::uint8_t {
    Left,
    Right,
    Middle,
    Back,
    Forward,
};

// "ctrl", "a", "f5", "enter", "super", ... (case-insensitive).
std::optional<Key> keyFromName(std::string_view name);
std::string_view keyName(Key key);

// Parses a chord such as "ctrl+shift+t" into its keys, modifiers first as written.
std::optional<std::vector<Key>> parseChord(std::string_view chord);

bool isModifier(Key key);

}  // namespace alvin