sdl3 :: #library "SDL3";

// SDL_InitFlags
SDL_INIT_VIDEO :u32: 0x20;

// SDL_WindowFlags
SDL_WINDOW_OPENGL :u64: 0x2;

// SDL_GLAttr (enum starting at 0)
SDL_GL_DOUBLEBUFFER          :s32: 5;
SDL_GL_DEPTH_SIZE            :s32: 6;
SDL_GL_CONTEXT_MAJOR_VERSION :s32: 17;
SDL_GL_CONTEXT_MINOR_VERSION :s32: 18;
SDL_GL_CONTEXT_FLAGS         :s32: 19;
SDL_GL_CONTEXT_PROFILE_MASK  :s32: 20;

// SDL_GLProfile
SDL_GL_CONTEXT_PROFILE_CORE :s32: 0x1;

// SDL_GLContextFlag
SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG :s32: 0x2;

// SDL_Keycode — virtual key codes (layout-dependent)
SDL_Keycode :: enum u32 {
    // Common
    unknown :: 0x00;
    return_key :: 0x0D;
    escape :: 0x1B;
    backspace :: 0x08;
    tab :: 0x09;
    space :: 0x20;
    delete_key :: 0x7F;

    // Punctuation
    exclaim :: 0x21;
    double_quote :: 0x22;
    hash :: 0x23;
    dollar :: 0x24;
    percent :: 0x25;
    ampersand :: 0x26;
    apostrophe :: 0x27;
    leftparen :: 0x28;
    rightparen :: 0x29;
    asterisk :: 0x2A;
    plus :: 0x2B;
    comma :: 0x2C;
    minus :: 0x2D;
    period :: 0x2E;
    slash :: 0x2F;
    colon :: 0x3A;
    semicolon :: 0x3B;
    less :: 0x3C;
    equals :: 0x3D;
    greater :: 0x3E;
    question :: 0x3F;
    at :: 0x40;
    leftbracket :: 0x5B;
    backslash :: 0x5C;
    rightbracket :: 0x5D;
    caret :: 0x5E;
    underscore :: 0x5F;
    grave :: 0x60;
    leftbrace :: 0x7B;
    pipe :: 0x7C;
    rightbrace :: 0x7D;
    tilde :: 0x7E;
    plusminus :: 0xB1;

    // Numbers
    key_0 :: 0x30;
    key_1 :: 0x31;
    key_2 :: 0x32;
    key_3 :: 0x33;
    key_4 :: 0x34;
    key_5 :: 0x35;
    key_6 :: 0x36;
    key_7 :: 0x37;
    key_8 :: 0x38;
    key_9 :: 0x39;

    // Letters
    a :: 0x61;
    b :: 0x62;
    c :: 0x63;
    d :: 0x64;
    e :: 0x65;
    f :: 0x66;
    g :: 0x67;
    h :: 0x68;
    i :: 0x69;
    j :: 0x6A;
    k :: 0x6B;
    l :: 0x6C;
    m :: 0x6D;
    n :: 0x6E;
    o :: 0x6F;
    p :: 0x70;
    q :: 0x71;
    r :: 0x72;
    s :: 0x73;
    t :: 0x74;
    u :: 0x75;
    v :: 0x76;
    w :: 0x77;
    x :: 0x78;
    y :: 0x79;
    z :: 0x7A;

    // Function keys
    f1 :: 0x4000003A;
    f2 :: 0x4000003B;
    f3 :: 0x4000003C;
    f4 :: 0x4000003D;
    f5 :: 0x4000003E;
    f6 :: 0x4000003F;
    f7 :: 0x40000040;
    f8 :: 0x40000041;
    f9 :: 0x40000042;
    f10 :: 0x40000043;
    f11 :: 0x40000044;
    f12 :: 0x40000045;
    f13 :: 0x40000068;
    f14 :: 0x40000069;
    f15 :: 0x4000006A;
    f16 :: 0x4000006B;
    f17 :: 0x4000006C;
    f18 :: 0x4000006D;
    f19 :: 0x4000006E;
    f20 :: 0x4000006F;
    f21 :: 0x40000070;
    f22 :: 0x40000071;
    f23 :: 0x40000072;
    f24 :: 0x40000073;

    // Navigation
    capslock :: 0x40000039;
    printscreen :: 0x40000046;
    scrolllock :: 0x40000047;
    pause :: 0x40000048;
    insert :: 0x40000049;
    home :: 0x4000004A;
    pageup :: 0x4000004B;
    end :: 0x4000004D;
    pagedown :: 0x4000004E;
    right :: 0x4000004F;
    left :: 0x40000050;
    down :: 0x40000051;
    up :: 0x40000052;

    // Keypad
    numlock :: 0x40000053;
    kp_divide :: 0x40000054;
    kp_multiply :: 0x40000055;
    kp_minus :: 0x40000056;
    kp_plus :: 0x40000057;
    kp_enter :: 0x40000058;
    kp_1 :: 0x40000059;
    kp_2 :: 0x4000005A;
    kp_3 :: 0x4000005B;
    kp_4 :: 0x4000005C;
    kp_5 :: 0x4000005D;
    kp_6 :: 0x4000005E;
    kp_7 :: 0x4000005F;
    kp_8 :: 0x40000060;
    kp_9 :: 0x40000061;
    kp_0 :: 0x40000062;
    kp_period :: 0x40000063;
    kp_equals :: 0x40000067;
    kp_comma :: 0x40000085;

    // Modifiers
    lctrl :: 0x400000E0;
    lshift :: 0x400000E1;
    lalt :: 0x400000E2;
    lgui :: 0x400000E3;
    rctrl :: 0x400000E4;
    rshift :: 0x400000E5;
    ralt :: 0x400000E6;
    rgui :: 0x400000E7;
    mode :: 0x40000101;

    // Editing
    undo :: 0x4000007A;
    cut :: 0x4000007B;
    copy :: 0x4000007C;
    paste :: 0x4000007D;
    find :: 0x4000007E;

    // Media
    mute :: 0x4000007F;
    volumeup :: 0x40000080;
    volumedown :: 0x40000081;
    media_play :: 0x40000106;
    media_pause :: 0x40000107;
    media_fast_forward :: 0x40000109;
    media_rewind :: 0x4000010A;
    media_next_track :: 0x4000010B;
    media_previous_track :: 0x4000010C;
    media_stop :: 0x4000010D;
    media_eject :: 0x4000010E;
    media_play_pause :: 0x4000010F;

    // System
    application :: 0x40000065;
    power :: 0x40000066;
    execute :: 0x40000074;
    help :: 0x40000075;
    menu :: 0x40000076;
    select :: 0x40000077;
    sleep :: 0x40000102;
    wake :: 0x40000103;
}

// Event payload structs — match SDL3 layout from byte 4 onward (after the u32 type tag)
// Common header: reserved (u32), timestamp (u64)

SDL_WindowData :: struct {
    timestamp: u64;     // event time in nanoseconds
    window_id: u32;
    data1: s32;         // event-dependent: x position for moved, width for resized
    data2: s32;         // event-dependent: y position for moved, height for resized
}

SDL_Keymod :: enum flags u16 {
    lshift :: 0b0000_0000_0000_0001;   // left Shift
    rshift :: 0b0000_0000_0000_0010;   // right Shift
    level5 :: 0b0000_0000_0000_0100;   // Level 5 Shift
    lctrl  :: 0b0000_0000_0100_0000;   // left Ctrl
    rctrl  :: 0b0000_0000_1000_0000;   // right Ctrl
    lalt   :: 0b0000_0001_0000_0000;   // left Alt
    ralt   :: 0b0000_0010_0000_0000;   // right Alt
    lgui   :: 0b0000_0100_0000_0000;   // left GUI (Windows/Cmd key)
    rgui   :: 0b0000_1000_0000_0000;   // right GUI (Windows/Cmd key)
    num    :: 0b0001_0000_0000_0000;   // Num Lock
    caps   :: 0b0010_0000_0000_0000;   // Caps Lock
    mode   :: 0b0100_0000_0000_0000;   // AltGr
    scroll :: 0b1000_0000_0000_0000;   // Scroll Lock
}

SDL_KeyData :: struct {
    timestamp: u64;     // event time in nanoseconds
    window_id: u32;     // window with keyboard focus
    which: u32;         // keyboard instance id, 0 if unknown or virtual
    scancode: u32;      // physical key code (layout-independent)
    key: SDL_Keycode;   // virtual key code (layout-dependent)
    mod: SDL_Keymod;    // active modifier keys
    raw: u16;           // platform-specific scancode
    down: u8;           // 1 if pressed, 0 if released
    repeat: u8;         // 1 if this is a key repeat
}

SDL_MouseMotionData :: struct {
    timestamp: u64;     // event time in nanoseconds
    window_id: u32;     // window with mouse focus
    which: u32;         // mouse instance id, 0 for touch events
    state: u32;         // button state bitmask (bit 0 = left, 1 = middle, 2 = right)
    x: f32;             // x position relative to window
    y: f32;             // y position relative to window
    xrel: f32;          // relative motion in x
    yrel: f32;          // relative motion in y
}

SDL_MouseButtonData :: struct {
    timestamp: u64;     // event time in nanoseconds
    window_id: u32;     // window with mouse focus
    which: u32;         // mouse instance id, 0 for touch events
    button: u8;         // button index (1 = left, 2 = middle, 3 = right)
    down: u8;           // 1 if pressed, 0 if released
    clicks: u8;         // 1 for single-click, 2 for double-click, etc.
    _: u8;
    x: f32;             // x position relative to window
    y: f32;             // y position relative to window
}

SDL_MouseWheelData :: struct {
    timestamp: u64;     // event time in nanoseconds
    window_id: u32;     // window with mouse focus
    which: u32;         // mouse instance id
    x: f32;             // horizontal scroll (positive = right)
    y: f32;             // vertical scroll (positive = away from user)
    direction: u32;     // 0 = normal, 1 = flipped (multiply by -1 to normalize)
    mouse_x: f32;       // mouse x position relative to window
    mouse_y: f32;       // mouse y position relative to window
}

SDL_Event :: enum struct { tag: u32; _: u32; payload: [30]u32; } {
    none :: 0;

    // Application
    quit :: 0x100;

    // Window
    window_shown :: 0x202: SDL_WindowData;
    window_hidden :: 0x203: SDL_WindowData;
    window_exposed :: 0x204: SDL_WindowData;
    window_moved :: 0x205: SDL_WindowData;
    window_resized :: 0x206: SDL_WindowData;
    window_minimized :: 0x209: SDL_WindowData;
    window_maximized :: 0x20A: SDL_WindowData;
    window_restored :: 0x20B: SDL_WindowData;
    window_mouse_enter :: 0x20C: SDL_WindowData;
    window_mouse_leave :: 0x20D: SDL_WindowData;
    window_focus_gained :: 0x20E: SDL_WindowData;
    window_focus_lost :: 0x20F: SDL_WindowData;
    window_close_requested :: 0x210: SDL_WindowData;
    window_destroyed :: 0x219: SDL_WindowData;

    // Keyboard
    key_down :: 0x300: SDL_KeyData;
    key_up :: 0x301: SDL_KeyData;

    // Mouse
    mouse_motion :: 0x400: SDL_MouseMotionData;
    mouse_button_down :: 0x401: SDL_MouseButtonData;
    mouse_button_up :: 0x402: SDL_MouseButtonData;
    mouse_wheel :: 0x403: SDL_MouseWheelData;
}

// Functions
SDL_Init               :: (flags: u32) -> bool #foreign sdl3;
SDL_Quit               :: () -> void #foreign sdl3;
SDL_CreateWindow       :: (title: [:0]u8, w: s32, h: s32, flags: u64) -> *void #foreign sdl3;
SDL_DestroyWindow      :: (window: *void) -> void #foreign sdl3;
SDL_GL_SetAttribute    :: (attr: s32, value: s32) -> bool #foreign sdl3;
SDL_GL_CreateContext    :: (window: *void) -> *void #foreign sdl3;
SDL_GL_DestroyContext   :: (context: *void) -> bool #foreign sdl3;
SDL_GL_MakeCurrent     :: (window: *void, context: *void) -> bool #foreign sdl3;
SDL_GL_SwapWindow      :: (window: *void) -> bool #foreign sdl3;
SDL_GL_SetSwapInterval :: (interval: s32) -> bool #foreign sdl3;
SDL_GL_GetProcAddress  :: (proc: [:0]u8) -> *void #foreign sdl3;
SDL_PollEvent          :: (event: *SDL_Event) -> bool #foreign sdl3;
SDL_GetTicks           :: () -> u64 #foreign sdl3;
SDL_Delay              :: (ms: u32) -> void #foreign sdl3;
SDL_GetError           :: () -> [*]u8 #foreign sdl3;