using System;
using System.Numerics;
using System.Runtime.InteropServices;

namespace Raylib_cs;

/// <summary>
/// Keyboard keys (US keyboard layout)<br/>
/// NOTE: Use GetKeyPressed() to allow redefining required keys for alternative layouts
/// </summary>
public enum KeyboardKey
{
    /// <summary>
    /// NULL, used for no key pressed
    /// </summary>
    KEY_NULL = 0,

    // Alphanumeric keys
    KEY_APOSTROPHE = 39,
    KEY_COMMA = 44,
    KEY_MINUS = 45,
    KEY_PERIOD = 46,
    KEY_SLASH = 47,
    KEY_ZERO = 48,
    KEY_ONE = 49,
    KEY_TWO = 50,
    KEY_THREE = 51,
    KEY_FOUR = 52,
    KEY_FIVE = 53,
    KEY_SIX = 54,
    KEY_SEVEN = 55,
    KEY_EIGHT = 56,
    KEY_NINE = 57,
    KEY_SEMICOLON = 59,
    KEY_EQUAL = 61,
    KEY_A = 65,
    KEY_B = 66,
    KEY_C = 67,
    KEY_D = 68,
    KEY_E = 69,
    KEY_F = 70,
    KEY_G = 71,
    KEY_H = 72,
    KEY_I = 73,
    KEY_J = 74,
    KEY_K = 75,
    KEY_L = 76,
    KEY_M = 77,
    KEY_N = 78,
    KEY_O = 79,
    KEY_P = 80,
    KEY_Q = 81,
    KEY_R = 82,
    KEY_S = 83,
    KEY_T = 84,
    KEY_U = 85,
    KEY_V = 86,
    KEY_W = 87,
    KEY_X = 88,
    KEY_Y = 89,
    KEY_Z = 90,

    // Function keys
    KEY_SPACE = 32,
    KEY_ESCAPE = 256,
    KEY_ENTER = 257,
    KEY_TAB = 258,
    KEY_BACKSPACE = 259,
    KEY_INSERT = 260,
    KEY_DELETE = 261,
    KEY_RIGHT = 262,
    KEY_LEFT = 263,
    KEY_DOWN = 264,
    KEY_UP = 265,
    KEY_PAGE_UP = 266,
    KEY_PAGE_DOWN = 267,
    KEY_HOME = 268,
    KEY_END = 269,
    KEY_CAPS_LOCK = 280,
    KEY_SCROLL_LOCK = 281,
    KEY_NUM_LOCK = 282,
    KEY_PRINT_SCREEN = 283,
    KEY_PAUSE = 284,
    KEY_F1 = 290,
    KEY_F2 = 291,
    KEY_F3 = 292,
    KEY_F4 = 293,
    KEY_F5 = 294,
    KEY_F6 = 295,
    KEY_F7 = 296,
    KEY_F8 = 297,
    KEY_F9 = 298,
    KEY_F10 = 299,
    KEY_F11 = 300,
    KEY_F12 = 301,
    KEY_LEFT_SHIFT = 340,
    KEY_LEFT_CONTROL = 341,
    KEY_LEFT_ALT = 342,
    KEY_LEFT_SUPER = 343,
    KEY_RIGHT_SHIFT = 344,
    KEY_RIGHT_CONTROL = 345,
    KEY_RIGHT_ALT = 346,
    KEY_RIGHT_SUPER = 347,
    KEY_KB_MENU = 348,
    KEY_LEFT_BRACKET = 91,
    KEY_BACKSLASH = 92,
    KEY_RIGHT_BRACKET = 93,
    KEY_GRAVE = 96,

    // Keypad keys
    KEY_KP_0 = 320,
    KEY_KP_1 = 321,
    KEY_KP_2 = 322,
    KEY_KP_3 = 323,
    KEY_KP_4 = 324,
    KEY_KP_5 = 325,
    KEY_KP_6 = 326,
    KEY_KP_7 = 327,
    KEY_KP_8 = 328,
    KEY_KP_9 = 329,
    KEY_KP_DECIMAL = 330,
    KEY_KP_DIVIDE = 331,
    KEY_KP_MULTIPLY = 332,
    KEY_KP_SUBTRACT = 333,
    KEY_KP_ADD = 334,
    KEY_KP_ENTER = 335,
    KEY_KP_EQUAL = 336,

    // Android key buttons
    KEY_BACK = 4,
    KEY_MENU = 82,
    KEY_VOLUME_UP = 24,
    KEY_VOLUME_DOWN = 25
}

/// <summary>
/// Mouse buttons
/// </summary>
public enum MouseButton
{
    /// <summary>
    /// Mouse button left
    /// </summary>
    MOUSE_BUTTON_LEFT = 0,

    /// <summary>
    /// Mouse button right
    /// </summary>
    MOUSE_BUTTON_RIGHT = 1,

    /// <summary>
    /// Mouse button middle (pressed wheel)
    /// </summary>
    MOUSE_BUTTON_MIDDLE = 2,

    /// <summary>
    /// Mouse button side (advanced mouse device)
    /// </summary>
    MOUSE_BUTTON_SIDE = 3,

    /// <summary>
    /// Mouse button extra (advanced mouse device)
    /// </summary>
    MOUSE_BUTTON_EXTRA = 4,

    /// <summary>
    /// Mouse button forward (advanced mouse device)
    /// </summary>
    MOUSE_BUTTON_FORWARD = 5,

    /// <summary>
    /// Mouse button back (advanced mouse device)
    /// </summary>
    MOUSE_BUTTON_BACK = 6,

    MOUSE_LEFT_BUTTON = MOUSE_BUTTON_LEFT,
    MOUSE_RIGHT_BUTTON = MOUSE_BUTTON_RIGHT,
    MOUSE_MIDDLE_BUTTON = MOUSE_BUTTON_MIDDLE,
}

/// <summary>
/// Mouse cursor
/// </summary>
public enum MouseCursor
{
    /// <summary>
    /// Default pointer shape
    /// </summary>
    MOUSE_CURSOR_DEFAULT = 0,

    /// <summary>
    /// Arrow shape
    /// </summary>
    MOUSE_CURSOR_ARROW = 1,

    /// <summary>
    /// Text writing cursor shape
    /// </summary>
    MOUSE_CURSOR_IBEAM = 2,

    /// <summary>
    /// Cross shape
    /// </summary>
    MOUSE_CURSOR_CROSSHAIR = 3,

    /// <summary>
    /// Pointing hand cursor
    /// </summary>
    MOUSE_CURSOR_POINTING_HAND = 4,

    /// <summary>
    /// Horizontal resize/move arrow shape
    /// </summary>
    MOUSE_CURSOR_RESIZE_EW = 5,

    /// <summary>
    /// Vertical resize/move arrow shape
    /// </summary>
    MOUSE_CURSOR_RESIZE_NS = 6,

    /// <summary>
    /// Top-left to bottom-right diagonal resize/move arrow shape
    /// </summary>
    MOUSE_CURSOR_RESIZE_NWSE = 7,

    /// <summary>
    /// The top-right to bottom-left diagonal resize/move arrow shape
    /// </summary>
    MOUSE_CURSOR_RESIZE_NESW = 8,

    /// <summary>
    /// The omnidirectional resize/move cursor shape
    /// </summary>
    MOUSE_CURSOR_RESIZE_ALL = 9,

    /// <summary>
    /// The operation-not-allowed shape
    /// </summary>
    MOUSE_CURSOR_NOT_ALLOWED = 10
}

/// <summary>Gamepad axis</summary>
public enum GamepadAxis
{
    /// <summary>
    /// Gamepad left stick X axis
    /// </summary>
    GAMEPAD_AXIS_LEFT_X = 0,

    /// <summary>
    /// Gamepad left stick Y axis
    /// </summary>
    GAMEPAD_AXIS_LEFT_Y = 1,

    /// <summary>
    /// Gamepad right stick X axis
    /// </summary>
    GAMEPAD_AXIS_RIGHT_X = 2,

    /// <summary>
    /// Gamepad right stick Y axis
    /// </summary>
    GAMEPAD_AXIS_RIGHT_Y = 3,

    /// <summary>
    /// Gamepad back trigger left, pressure level: [1..-1]
    /// </summary>
    GAMEPAD_AXIS_LEFT_TRIGGER = 4,

    /// <summary>
    /// Gamepad back trigger right, pressure level: [1..-1]
    /// </summary>
    GAMEPAD_AXIS_RIGHT_TRIGGER = 5
}

/// <summary>
/// Gamepad buttons
/// </summary>
public enum GamepadButton
{
    /// <summary>
    /// Unknown button, just for error checking
    /// </summary>
    GAMEPAD_BUTTON_UNKNOWN = 0,

    /// <summary>
    /// Gamepad left DPAD up button
    /// </summary>
    GAMEPAD_BUTTON_LEFT_FACE_UP,

    /// <summary>
    /// Gamepad left DPAD right button
    /// </summary>
    GAMEPAD_BUTTON_LEFT_FACE_RIGHT,

    /// <summary>
    /// Gamepad left DPAD down button
    /// </summary>
    GAMEPAD_BUTTON_LEFT_FACE_DOWN,

    /// <summary>
    /// Gamepad left DPAD left button
    /// </summary>
    GAMEPAD_BUTTON_LEFT_FACE_LEFT,

    /// <summary>
    /// Gamepad right button up (i.e. PS3: Triangle, Xbox: Y)
    /// </summary>
    GAMEPAD_BUTTON_RIGHT_FACE_UP,

    /// <summary>
    /// Gamepad right button right (i.e. PS3: Square, Xbox: X)
    /// </summary>
    GAMEPAD_BUTTON_RIGHT_FACE_RIGHT,

    /// <summary>
    /// Gamepad right button down (i.e. PS3: Cross, Xbox: A)
    /// </summary>
    GAMEPAD_BUTTON_RIGHT_FACE_DOWN,

    /// <summary>
    /// Gamepad right button left (i.e. PS3: Circle, Xbox: B)
    /// </summary>
    GAMEPAD_BUTTON_RIGHT_FACE_LEFT,

    /// <summary>
    /// Gamepad top/back trigger left (first), it could be a trailing button
    /// </summary>
    GAMEPAD_BUTTON_LEFT_TRIGGER_1,

    /// <summary>
    /// Gamepad top/back trigger left (second), it could be a trailing button
    /// </summary>
    GAMEPAD_BUTTON_LEFT_TRIGGER_2,

    /// <summary>
    /// Gamepad top/back trigger right (first), it could be a trailing button
    /// </summary>
    GAMEPAD_BUTTON_RIGHT_TRIGGER_1,

    /// <summary>
    /// Gamepad top/back trigger right (second), it could be a trailing button
    /// </summary>
    GAMEPAD_BUTTON_RIGHT_TRIGGER_2,

    /// <summary>
    /// Gamepad center buttons, left one (i.e. PS3: Select)
    /// </summary>
    GAMEPAD_BUTTON_MIDDLE_LEFT,

    /// <summary>
    /// Gamepad center buttons, middle one (i.e. PS3: PS, Xbox: XBOX)
    /// </summary>
    GAMEPAD_BUTTON_MIDDLE,

    /// <summary>
    /// Gamepad center buttons, right one (i.e. PS3: Start)
    /// </summary>
    GAMEPAD_BUTTON_MIDDLE_RIGHT,

    /// <summary>
    /// Gamepad joystick pressed button left
    /// </summary>
    GAMEPAD_BUTTON_LEFT_THUMB,

    /// <summary>
    /// Gamepad joystick pressed button right
    /// </summary>
    GAMEPAD_BUTTON_RIGHT_THUMB
}

/// <summary>
/// Gesture
/// NOTE: It could be used as flags to enable only some gestures
/// </summary>
[Flags]
public enum Gesture : uint
{
    GESTURE_NONE = 0,
    GESTURE_TAP = 1,
    GESTURE_DOUBLETAP = 2,
    GESTURE_HOLD = 4,
    GESTURE_DRAG = 8,
    GESTURE_SWIPE_RIGHT = 16,
    GESTURE_SWIPE_LEFT = 32,
    GESTURE_SWIPE_UP = 64,
    GESTURE_SWIPE_DOWN = 128,
    GESTURE_PINCH_IN = 256,
    GESTURE_PINCH_OUT = 512
}

/// <summary>
/// Head-Mounted-Display device parameters
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public unsafe partial struct VrDeviceInfo
{
    /// <summary>
    /// HMD horizontal resolution in pixels
    /// </summary>
    public int HResolution;

    /// <summary>
    /// HMD vertical resolution in pixels
    /// </summary>
    public int VResolution;

    /// <summary>
    /// HMD horizontal size in meters
    /// </summary>
    public float HScreenSize;

    /// <summary>
    /// HMD vertical size in meters
    /// </summary>
    public float VScreenSize;

    /// <summary>
    /// HMD screen center in meters
    /// </summary>
    public float VScreenCenter;

    /// <summary>
    /// HMD distance between eye and display in meters
    /// </summary>
    public float EyeToScreenDistance;

    /// <summary>
    /// HMD lens separation distance in meters
    /// </summary>
    public float LensSeparationDistance;

    /// <summary>
    /// HMD IPD (distance between pupils) in meters
    /// </summary>
    public float InterpupillaryDistance;

    /// <summary>
    /// HMD lens distortion constant parameters
    /// </summary>
    public fixed float LensDistortionValues[4];

    /// <summary>
    /// HMD chromatic aberration correction parameters
    /// </summary>
    public fixed float ChromaAbCorrection[4];
}

/// <summary>
/// VR Stereo rendering configuration for simulator
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public partial struct VrStereoConfig
{
    /// <summary>
    /// VR projection matrices (per eye)
    /// </summary>
    public Matrix4x4 Projection1;

    /// <summary>
    /// VR projection matrices (per eye)
    /// </summary>
    public Matrix4x4 Projection2;

    /// <summary>
    /// VR view offset matrices (per eye)
    /// </summary>
    public Matrix4x4 ViewOffset1;

    /// <summary>
    /// VR view offset matrices (per eye)
    /// </summary>
    public Matrix4x4 ViewOffset2;

    /// <summary>
    /// VR left lens center
    /// </summary>
    public Vector2 LeftLensCenter;

    /// <summary>
    /// VR right lens center
    /// </summary>
    public Vector2 RightLensCenter;

    /// <summary>
    /// VR left screen center
    /// </summary>
    public Vector2 LeftScreenCenter;

    /// <summary>
    /// VR right screen center
    /// </summary>
    public Vector2 RightScreenCenter;

    /// <summary>
    /// VR distortion scale
    /// </summary>
    public Vector2 Scale;

    /// <summary>
    /// VR distortion scale in
    /// </summary>
    public Vector2 ScaleIn;
}
