const std = @import("std");

pub const c = @import("c.zig").c;

pub const Bitmap = struct {
    native: *c.ALLEGRO_BITMAP,

    pub fn destroy(self: Bitmap) void {
        destroyBitmap(self);
    }

    pub fn draw(self: Bitmap, x: f32, y: f32, flags: DrawFlags) void {
        drawBitmap(self, x, y, flags);
    }

    pub fn drawCentered(self: Bitmap, x: f32, y: f32) void {
        self.draw(x - 0.5 * @intToFloat(f32, self.width()), y - 0.5 * @intToFloat(f32, self.height()), DrawFlags{});
    }

    pub fn drawCenteredScaled(self: Bitmap, x: f32, y: f32, s: f32) void {
        const w = s * @intToFloat(f32, self.width());
        const h = s * @intToFloat(f32, self.height());
        self.drawScaled(x - 0.5 * w, y - 0.5 * h, w, h, DrawFlags{});
    }

    pub fn drawScaled(self: Bitmap, x: f32, y: f32, w: f32, h: f32, flags: DrawFlags) void {
        drawScaledBitmap(self, 0, 0, @intToFloat(f32, self.width()), @intToFloat(f32, self.height()), x, y, w, h, flags);
    }

    pub fn drawTinted(self: Bitmap, tint: Color, x: f32, y: f32, flags: DrawFlags) void {
        drawTintedBitmap(self, tint, x, y, flags);
    }

    pub fn drawTintedCentered(self: Bitmap, tint: Color, x: f32, y: f32) void {
        self.drawTinted(tint, x - 0.5 * @intToFloat(f32, self.width()), y - 0.5 * @intToFloat(f32, self.height()), DrawFlags{});
    }

    pub fn drawTintedCenteredScaled(self: Bitmap, tint: Color, x: f32, y: f32, s: f32) void {
        const w = s * @intToFloat(f32, self.width());
        const h = s * @intToFloat(f32, self.height());
        self.drawTintedScaled(tint, x - 0.5 * w, y - 0.5 * h, w, h, DrawFlags{});
    }

    pub fn drawTintedScaled(self: Bitmap, tint: Color, x: f32, y: f32, w: f32, h: f32, flags: DrawFlags) void {
        drawTintedScaledBitmap(self, tint, 0, 0, @intToFloat(f32, self.width()), @intToFloat(f32, self.height()), x, y, w, h, flags);
    }

    pub fn height(self: Bitmap) i32 {
        return getBitmapHeight(self);
    }

    pub fn width(self: Bitmap) i32 {
        return getBitmapWidth(self);
    }
};

pub const Color = struct {
    native: c.ALLEGRO_COLOR,

    fn hexToU4(hex: u8) u4 {
        return switch (hex) {
            '0'...'9' => @intCast(u4, hex - '0'),
            'a'...'f' => @intCast(u4, hex - 'a') + 10,
            'A'...'F' => @intCast(u4, hex - 'A') + 10,
            else => unreachable,
        };
    }

    pub fn initFromHex(hex: []const u8) Color {
        if (hex.len == 0) unreachable;

        const left: usize = if (hex[0] == '#') 1 else 0;

        if (hex.len < left + 6) unreachable;

        const r = (@intCast(u8, hexToU4(hex[left])) << 4) + @intCast(u8, hexToU4(hex[left + 1]));
        const g = (@intCast(u8, hexToU4(hex[left + 2])) << 4) + @intCast(u8, hexToU4(hex[left + 3]));
        const b = (@intCast(u8, hexToU4(hex[left + 4])) << 4) + @intCast(u8, hexToU4(hex[left + 5]));
        if (hex.len < left + 8) {
            return mapRgb(r, g, b);
        }
        const a = (@intCast(u8, hexToU4(hex[left + 6])) << 4) + @intCast(u8, hexToU4(hex[left + 7]));
        return mapRgba(r, g, b, a);
    }
};

pub const Display = struct {
    native: *c.ALLEGRO_DISPLAY,

    pub fn destroy(self: Display) void {
        destroyDisplay(self);
    }

    pub fn eventSource(self: Display) EventSource {
        return getDisplayEventSource(self);
    }

    pub fn height(self: Display) i32 {
        return getDisplayHeight(self);
    }

    pub fn width(self: Display) i32 {
        return getDisplayWidth(self);
    }
};

pub const DrawFlags = packed struct(c_int) {
    FLIP_HORIZONTAL: bool = false, // 0x00001
    FLIP_VERTICAL: bool = false, // 0x00002
    _NOT_USED: u30 = 0,
};

pub const DrawTextFlags = enum(c_int) {
    NO_KERNING = -1,
    ALIGN_LEFT = 0,
    ALIGN_CENTER = 1,
    ALIGN_RIGHT = 2,
    ALIGN_LEFT_INTEGER = 4,
    ALIGN_CENTER_INTEGER = 5,
    ALIGN_RIGHT_INTEGER = 6,
};

pub const Event = c.ALLEGRO_EVENT;

pub const EventQueue = struct {
    native: *c.ALLEGRO_EVENT_QUEUE,

    pub fn destroy(self: EventQueue) void {
        destroyEventQueue(self);
    }

    pub fn drop(self: EventQueue) void {
        dropNextEvent(self);
    }

    pub fn flush(self: EventQueue) void {
        flushEventQueue(self);
    }

    pub fn get(self: EventQueue, event: *Event) bool {
        return getNextEvent(self, event);
    }

    pub fn isEmpty(self: EventQueue) bool {
        return isEventQueueEmpty(self);
    }

    pub fn peek(self: EventQueue, event: *Event) void {
        peekNextEvent(self, event);
    }

    pub fn register(self: EventQueue, source: EventSource) void {
        registerEventSource(self, source);
    }

    pub fn registerDisplay(self: EventQueue, display: Display) void {
        self.register(display.eventSource());
    }

    pub fn registerKeyboard(self: EventQueue) void {
        self.register(getKeyboardEventSource());
    }

    pub fn registerMouse(self: EventQueue) void {
        self.register(getMouseEventSource());
    }

    pub fn registerTimer(self: EventQueue, timer: Timer) void {
        self.register(timer);
    }

    pub fn unregister(self: EventQueue, source: EventSource) void {
        unregisterEventSource(self, source);
    }

    pub fn unregisterDisplay(self: EventQueue, display: Display) void {
        self.unregister(display.eventSource());
    }

    pub fn wait(self: EventQueue, event: *Event) void {
        waitForEvent(self, event);
    }
};

pub const EventSource = struct {
    native: *c.ALLEGRO_EVENT_SOURCE,
};

pub const File = struct {
    native: *c.ALLEGRO_FILE,

    pub fn close(file: File) void {
        fclose(file);
    }
};

pub const Font = struct {
    native: *c.ALLEGRO_FONT,

    pub fn destroy(self: Font) void {
        destroyFont(self);
    }

    pub fn draw(self: Font, color: Color, x: f32, y: f32, flags: DrawTextFlags, text: [*:0]const u8) void {
        drawText(self, color, x, y, flags, text);
    }

    pub fn textWidth(self: Font, text: [*:0]const u8) i32 {
        return getTextWidth(self, text);
    }
};

pub const LoadBitmapFlags = packed struct(c_int) {
    _NOT_USED_1: bool = false,
    KEEP_BITMAP_FORMAT: bool = false, // 0x0002 // was a bitmap flag in 5.0
    _NOT_USED_2: u7 = 0,
    NO_PREMULTIPLIED_ALPHA: bool = false, // 0x0200 // was a bitmap flag in 5.0
    _NOT_USED_3: bool = false,
    KEEP_INDEX: bool = false, // 0x0800
    _NOT_USED_4: u20 = 0,
};

pub const LoadTtfFontFlags = packed struct(c_int) {
    NO_KERNING: bool = false,
    MONOCHROME: bool = false,
    NO_AUTOHINT: bool = false,
    _NOT_USED: u29 = 0,
};

pub const NewBitmapFlags = packed struct(c_int) {
    MEMORY_BITMAP: bool = false, // 0x0001,
    _KEEP_BITMAP_FORMAT: bool = false, // 0x0002,
    FORCE_LOCKING: bool = false, // 0x0004,
    NO_PRESERVE_TEXTURE: bool = false, // 0x0008,
    _ALPHA_TEST: bool = false, // 0x0010,
    _INTERNAL_OPENGL: bool = false, // 0x0020,
    MIN_LINEAR: bool = false, // 0x0040,
    MAG_LINEAR: bool = false, // 0x0080,
    MIPMAP: bool = false, // 0x0100,
    _NO_PREMULTIPLIED_ALPHA: bool = false, // 0x0200,
    VIDEO_BITMAP: bool = false, // 0x0400,
    _NOT_USED_1: bool = false, // 0x0800
    CONVERT_BITMAP: bool = false, // 0x1000,
    _NOT_USED_4: u19 = 0,
};

pub const NewDisplayFlags = packed struct(c_int) {
    WINDOWED: bool = false,
    FULLSCREEN: bool = false,
    OPENGL: bool = false,
    DIRECT3D_INTERNAL: bool = false,
    RESIZABLE: bool = false,
    FRAMELESS: bool = false,
    GENERATE_EXPOSE_EVENTS: bool = false,
    OPENGL_3_0: bool = false,
    OPENGL_FORWARD_COMPATIBLE: bool = false,
    FULLSCREEN_WINDOW: bool = false,
    MINIMIZED: bool = false,
    PROGRAMMABLE_PIPELINE: bool = false,
    GTK_TOPLEVEL_INTERNAL: bool = false,
    MAXIMIZED: bool = false,
    OPENGL_ES_PROFILE: bool = false,
    OPENGL_CORE_PROFILE: bool = false,
    _NOT_USED: u16 = 0,
};

pub const NewDisplayOption = enum(c_int) {
    RED_SIZE, // 0
    GREEN_SIZE, // 1
    BLUE_SIZE, // 2
    ALPHA_SIZE, // 3
    RED_SHIFT, // 4
    GREEN_SHIFT, // 5
    BLUE_SHIFT, // 6
    ALPHA_SHIFT, // 7
    ACC_RED_SIZE, // 8
    ACC_GREEN_SIZE, // 9
    ACC_BLUE_SIZE, // 10
    ACC_ALPHA_SIZE, // 11
    STEREO, // 12
    AUX_BUFFERS, // 13
    COLOR_SIZE, // 14
    DEPTH_SIZE, // 15
    STENCIL_SIZE, // 16
    SAMPLE_BUFFERS, // 17
    SAMPLES, // 18
    RENDER_METHOD, // 19
    FLOAT_COLOR, // 20
    FLOAT_DEPTH, // 21
    SINGLE_BUFFER, // 22
    SWAP_METHOD, // 23
    COMPATIBLE_DISPLAY, // 24
    UPDATE_DISPLAY_REGION, // 25
    VSYNC, // 26
    MAX_BITMAP_SIZE, // 27
    SUPPORT_NPOT_BITMAP, // 28
    CAN_DRAW_INTO_BITMAP, // 29
    SUPPORT_SEPARATE_ALPHA, // 30
    AUTO_CONVERT_BITMAPS, // 31
    SUPPORTED_ORIENTATIONS, // 32
    OPENGL_MAJOR_VERSION, // 33
    OPENGL_MINOR_VERSION, // 34
    DEFAULT_SHADER_PLATFORM, // 35
};

pub const OptionImportance = enum(c_int) {
    DONTCARE, // 0
    REQUIRE, // 1
    SUGGEST, // 2
};

pub const PixelFormat = enum(c_int) {
    ANY, // 0
    ANY_NO_ALPHA, // 1
    ANY_WITH_ALPHA, // 2
    ANY_15_NO_ALPHA, // 3
    ANY_16_NO_ALPHA, // 4
    ANY_16_WITH_ALPHA, // 5
    ANY_24_NO_ALPHA, // 6
    ANY_32_NO_ALPHA, // 7
    ANY_32_WITH_ALPHA, // 8
    ARGB_8888, // 9
    RGBA_8888, // 10
    ARGB_4444, // 11
    RGB_888, // 12 // 24 bit format
    RGB_565, // 13
    RGB_555, // 14
    RGBA_5551, // 15
    ARGB_1555, // 16
    ABGR_8888, // 17
    XBGR_8888, // 18
    BGR_888, // 19 // 24 bit format
    BGR_565, // 20
    BGR_555, // 21
    RGBX_8888, // 22
    XRGB_8888, // 23
    ABGR_F32, // 24
    ABGR_8888_LE, // 25
    RGBA_4444, // 26
    SINGLE_CHANNEL_8, // 27
    COMPRESSED_RGBA_DXT1, // 28
    COMPRESSED_RGBA_DXT3, // 29
    COMPRESSED_RGBA_DXT5, // 30
    ALLEGRO_NUM_PIXEL_FORMATS,
};

pub const Timer = struct {
    native: *c.ALLEGRO_TIMER,

    pub fn destroy(self: Timer) void {
        destroyTimer(self);
    }

    pub fn eventSource(self: Timer) EventSource {
        return getTimerEventSource(self);
    }

    pub fn start(self: Timer) void {
        startTimer(self);
    }
};

pub fn acknowledgeResize(display: Display) bool {
    return c.al_acknowledge_resize(display.native);
}

pub fn clearToColor(color: Color) void {
    c.al_clear_to_color(color.native);
}

pub fn convertMemoryBitmaps() void {
    c.al_convert_memory_bitmaps();
}

pub fn createBitmap(width: i32, height: i32) !Bitmap {
    const bitmap = c.al_create_bitmap(width, height);
    if (bitmap) |native| {
        return Bitmap{ .native = native };
    }
    return error.FailedToCreateBitmap;
}

pub fn createDisplay(width: i32, height: i32) !Display {
    const display = c.al_create_display(width, height);
    if (display) |native| {
        return Display{ .native = native };
    }
    return error.FailedToCreateDisplay;
}

pub fn createEventQueue() !EventQueue {
    const queue = c.al_create_event_queue();
    if (queue) |native| {
        return EventQueue{ .native = native };
    }
    return error.FailedToCreateEventQueue;
}

pub fn createTimer(interval: f32) !Timer {
    const timer = c.al_create_timer(interval);
    if (timer) |native| {
        return Timer{ .native = native };
    }
    return error.FailedToCreateTimer;
}

pub fn destroyBitmap(bitmap: Bitmap) void {
    c.al_destroy_bitmap(bitmap.native);
}

pub fn destroyDisplay(display: Display) void {
    c.al_destroy_display(display.native);
}

pub fn destroyEventQueue(queue: EventQueue) void {
    c.al_destroy_event_queue(queue.native);
}

pub fn destroyFont(font: Font) void {
    c.al_destroy_font(font.native);
}

pub fn destroyTimer(timer: Timer) void {
    c.al_destroy_timer(timer.native);
}

pub fn drawBitmap(bitmap: Bitmap, dx: f32, dy: f32, flags: DrawFlags) void {
    c.al_draw_bitmap(bitmap.native, dx, dy, @bitCast(c_int, flags));
}

pub fn drawScaledBitmap(bitmap: Bitmap, sx: f32, sy: f32, sw: f32, sh: f32, dx: f32, dy: f32, dw: f32, dh: f32, flags: DrawFlags) void {
    c.al_draw_scaled_bitmap(bitmap.native, sx, sy, sw, sh, dx, dy, dw, dh, @bitCast(c_int, flags));
}

pub fn drawText(font: Font, color: Color, x: f32, y: f32, flags: DrawTextFlags, text: [*:0]const u8) void {
    c.al_draw_text(font.native, color.native, x, y, @enumToInt(flags), text);
}

pub fn drawTintedBitmap(bitmap: Bitmap, tint: Color, dx: f32, dy: f32, flags: DrawFlags) void {
    c.al_draw_tinted_bitmap(bitmap.native, tint.native, dx, dy, @bitCast(c_int, flags));
}

pub fn drawTintedScaledBitmap(bitmap: Bitmap, tint: Color, sx: f32, sy: f32, sw: f32, sh: f32, dx: f32, dy: f32, dw: f32, dh: f32, flags: DrawFlags) void {
    c.al_draw_tinted_scaled_bitmap(bitmap.native, tint.native, sx, sy, sw, sh, dx, dy, dw, dh, @bitCast(c_int, flags));
}

pub fn dropNextEvent(queue: EventQueue) bool {
    return c.al_drop_next_event(queue.native);
}

pub fn fclose(file: File) bool {
    return c.al_fclose(file.native);
}

pub fn flipDisplay() void {
    c.al_flip_display();
}

pub fn flushEventQueue(queue: EventQueue) void {
    c.al_flush_event_queue(queue.native);
}

pub fn isEventQueueEmpty(queue: EventQueue) bool {
    return c.al_is_event_queue_empty(queue.native);
}

pub fn getBackbuffer(display: Display) !Bitmap {
    const bitmap = c.al_get_backbuffer(display.native);
    if (bitmap) |native| {
        return Bitmap{ .native = native };
    }
    return error.FailedToGetBackBufferForDisplay;
}

pub fn getBitmapHeight(bitmap: Bitmap) c_int {
    return c.al_get_bitmap_height(bitmap.native);
}

pub fn getBitmapWidth(bitmap: Bitmap) c_int {
    return c.al_get_bitmap_width(bitmap.native);
}

pub fn getCurrentDisplay() !Display {
    const display = c.al_get_current_display();
    if (display) |native| {
        return Display{ .native = native };
    }
    return error.NoCurrentDisplay;
}

pub fn getDisplayEventSource(display: Display) EventSource {
    return EventSource{ .native = c.al_get_display_event_source(display.native) };
}

pub fn getDisplayFlags(display: Display) NewDisplayFlags {
    return @bitCast(NewDisplayFlags, c.al_get_display_flags(display.native));
}

pub fn getDisplayHeight(display: Display) i32 {
    return c.al_get_display_height(display.native);
}

pub fn getDisplayWidth(display: Display) i32 {
    return c.al_get_display_width(display.native);
}

pub fn getFontAscent(font: Font) i32 {
    return c.al_get_font_ascent(font.native);
}

pub fn getFontDescent(font: Font) i32 {
    return c.al_get_font_descent(font.native);
}

pub fn getFontLineHeight(font: Font) i32 {
    return c.al_get_font_line_height(font.native);
}

pub fn getKeyboardEventSource() EventSource {
    return EventSource{ .native = c.al_get_keyboard_event_source() };
}

pub fn getNewBitmapFlags() NewBitmapFlags {
    return c.al_set_new_bitmap_flags();
}

pub fn getNewDisplayOption(option: NewDisplayOption, importance: *OptionImportance) c_int {
    return c.al_get_new_display_option(@enumToInt(option), @ptrCast(*c_int, importance));
}

pub fn getNewBitmapFormat() PixelFormat {
    return c.al_set_new_bitmap_format();
}

pub fn getNewDisplayFlags() NewDisplayFlags {
    return c.al_get_new_display_flags();
}

pub fn getNextEvent(queue: EventQueue, event: *Event) bool {
    return c.al_get_next_event(queue.native, event);
}

pub fn getMouseEventSource() EventSource {
    return EventSource{ .native = c.al_get_mouse_event_source() };
}

pub fn getTextWidth(font: Font, text: [*:0]const u8) void {
    c.al_get_text_width(font.native, &text[0]);
}

pub fn getTime() f64 {
    return c.al_get_time();
}

pub fn getTimerEventSource(timer: Timer) EventSource {
    return EventSource{ .native = c.al_get_timer_event_source(timer.native) };
}

pub fn init() bool {
    return c.al_init();
}

pub fn initFontAddon() bool {
    return c.al_init_font_addon();
}

pub fn initImageAddon() bool {
    return c.al_init_image_addon();
}

pub fn initTtfAddon() bool {
    return c.al_init_ttf_addon();
}

pub fn installKeyboard() bool {
    return c.al_install_keyboard();
}

pub fn installMouse() bool {
    return c.al_install_mouse();
}

pub fn loadBitmap(path: [*:0]const u8) !Bitmap {
    const bitmap = c.al_load_bitmap(path);
    if (bitmap) |native| {
        return Bitmap{ .native = native };
    }
    return error.FailedToLoadBitmap;
}

pub fn loadBitmapF(file: File, ident: []const u8) !Bitmap {
    const bitmap = c.al_load_bitmap_f(file.native, &ident[0]);
    if (bitmap) |native| {
        return Bitmap{ .native = native };
    }
    return error.FailedToLoadBitmap;
}

pub fn loadBitmapFont(path: [*:0]const u8) !Font {
    const font = c.al_load_bitmap_font(path);
    if (font) |native| {
        return Font{ .native = native };
    }
    return error.FailedToLoadFont;
}

pub fn loadFont(path: [*:0]const u8, size: i32, flags: c_int) !Font {
    const font = c.al_load_font(path, size, flags);
    if (font) |native| {
        return Font{ .native = native };
    }
    return error.FailedToLoadFont;
}

pub fn loadTtfFont(path: [*:0]const u8, size: i32, flags: LoadTtfFontFlags) !Font {
    const font = c.al_load_ttf_font(path, size, @bitCast(c_int, flags));
    if (font) |native| {
        return Font{ .native = native };
    }
    return error.FailedToLoadFont;
}

pub fn mapRgb(r: u8, g: u8, b: u8) Color {
    return Color{ .native = c.al_map_rgb(r, g, b) };
}

pub fn mapRgba(r: u8, g: u8, b: u8, a: u8) Color {
    return Color{ .native = c.al_map_rgba(r, g, b, a) };
}

pub fn mapRgbaF(r: f32, g: f32, b: f32, a: f32) Color {
    return Color{ .native = c.al_map_rgba_f(r, g, b, a) };
}

pub fn mapRgbF(r: f32, g: f32, b: f32) Color {
    return Color{ .native = c.al_map_rgb_f(r, g, b) };
}

pub fn openMemfile(data: []u8, mode: []const u8) !File {
    const file = c.al_open_memfile(&data[0], @intCast(i64, data.len), &mode[0]);
    if (file) |native| {
        return File{ .native = native };
    }
    return error.FailedToOpenMemfile;
}

pub fn peekNextEvent(queue: EventQueue, event: *Event) bool {
    return c.al_peek_next_event(queue.native, event);
}

pub fn registerEventSource(queue: EventQueue, source: EventSource) void {
    c.al_register_event_source(queue.native, source.native);
}

pub fn setDisplayFlag(display: Display, flag: NewDisplayFlags, on: bool) bool {
    return c.al_set_display_flag(display.native, @bitCast(c_int, flag), on);
}

pub fn setNewBitmapFlags(flags: NewBitmapFlags) void {
    c.al_set_new_bitmap_flags(@bitCast(c_int, flags));
}

pub fn setNewBitmapFormat(format: PixelFormat) void {
    c.al_set_new_bitmap_format(format);
}

pub fn setNewDisplayFlags(flags: NewDisplayFlags) void {
    c.al_set_new_display_flags(@bitCast(c_int, flags));
}

pub fn setNewDisplayOption(option: NewDisplayOption, value: i32, importance: OptionImportance) void {
    c.al_set_new_display_option(@enumToInt(option), value, @enumToInt(importance));
}

pub fn setTargetBitmap(bitmap: Bitmap) void {
    c.al_set_target_bitmap(bitmap.native);
}

pub fn setTargetBackbuffer(display: Display) void {
    c.al_set_target_bitmap(display.native);
}

pub fn startTimer(timer: Timer) void {
    c.al_start_timer(timer.native);
}

pub fn unregisterEventSource(queue: EventQueue, source: EventSource) void {
    c.al_unregister_event_source(queue.native, source.native);
}

pub fn waitForEvent(queue: EventQueue, event: *Event) void {
    c.al_wait_for_event(queue.native, event);
}

pub fn waitForVsync() bool {
    return c.al_wait_for_vsync();
}