/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"

#if SDL_VIDEO_DRIVER_UIKIT

#include "SDL_assert.h"
#include "SDL_uikitmodes.h"


static int
UIKit_AllocateDisplayModeData(SDL_DisplayMode * mode,
    UIScreenMode * uiscreenmode)
{
    SDL_DisplayModeData *data = NULL;

    if (uiscreenmode != nil) {
        /* Allocate the display mode data */
        data = (SDL_DisplayModeData *) SDL_malloc(sizeof(*data));
        if (!data) {
            return SDL_OutOfMemory();
        }

        data->uiscreenmode = uiscreenmode;
        [data->uiscreenmode retain];
    }

    mode->driverdata = data;

    return 0;
}

static void
UIKit_FreeDisplayModeData(SDL_DisplayMode * mode)
{
    if (mode->driverdata != NULL) {
        SDL_DisplayModeData *data = (SDL_DisplayModeData *)mode->driverdata;
        [data->uiscreenmode release];
        SDL_free(data);
        mode->driverdata = NULL;
    }
}

static int
UIKit_AddSingleDisplayMode(SDL_VideoDisplay * display, int w, int h,
    UIScreenMode * uiscreenmode)
{
    SDL_DisplayMode mode;
    SDL_zero(mode);

    mode.format = SDL_PIXELFORMAT_ABGR8888;
    mode.refresh_rate = 0;
    if (UIKit_AllocateDisplayModeData(&mode, uiscreenmode) < 0) {
        return -1;
    }

    mode.w = w;
    mode.h = h;
    if (SDL_AddDisplayMode(display, &mode)) {
        return 0;
    } else {
        UIKit_FreeDisplayModeData(&mode);
        return -1;
    }
}

static int
UIKit_AddDisplayMode(SDL_VideoDisplay * display, int w, int h,
                     UIScreenMode * uiscreenmode, SDL_bool addRotation)
{
    if (UIKit_AddSingleDisplayMode(display, w, h, uiscreenmode) < 0) {
        return -1;
    }

    if (addRotation) {
        /* Add the rotated version */
        if (UIKit_AddSingleDisplayMode(display, h, w, uiscreenmode) < 0) {
            return -1;
        }
    }

    return 0;
}

static int
UIKit_AddDisplay(UIScreen *uiscreen)
{
    CGSize size = [uiscreen bounds].size;

    /* Make sure the width/height are oriented correctly */
    if (UIKit_IsDisplayLandscape(uiscreen) != (size.width > size.height)) {
        CGFloat height = size.width;
        size.width = size.height;
        size.height = height;
    }

    SDL_VideoDisplay display;
    SDL_DisplayMode mode;
    SDL_zero(mode);
    mode.format = SDL_PIXELFORMAT_ABGR8888;
    mode.w = (int) size.width;
    mode.h = (int) size.height;

    UIScreenMode *uiscreenmode = [uiscreen currentMode];

    if (UIKit_AllocateDisplayModeData(&mode, uiscreenmode) < 0) {
        return -1;
    }

    SDL_zero(display);
    display.desktop_mode = mode;
    display.current_mode = mode;

    /* Allocate the display data */
    SDL_DisplayData *data = (SDL_DisplayData *) SDL_malloc(sizeof(*data));
    if (!data) {
        UIKit_FreeDisplayModeData(&display.desktop_mode);
        return SDL_OutOfMemory();
    }

    [uiscreen retain];
    data->uiscreen = uiscreen;

    display.driverdata = data;
    SDL_AddVideoDisplay(&display);

    return 0;
}

SDL_bool
UIKit_IsDisplayLandscape(UIScreen *uiscreen)
{
    if (uiscreen == [UIScreen mainScreen]) {
        return UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication] statusBarOrientation]);
    } else {
        CGSize size = [uiscreen bounds].size;
        return (size.width > size.height);
    }
}

int
UIKit_InitModes(_THIS)
{
    for (UIScreen *uiscreen in [UIScreen screens]) {
        if (UIKit_AddDisplay(uiscreen) < 0) {
            return -1;
        }
    }

    return 0;
}

void
UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
{
    SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;

    SDL_bool isLandscape = UIKit_IsDisplayLandscape(data->uiscreen);
    SDL_bool addRotation = (data->uiscreen == [UIScreen mainScreen]);
    CGFloat scale = data->uiscreen.scale;

    for (UIScreenMode *uimode in [data->uiscreen availableModes]) {
        /* The size of a UIScreenMode is in pixels, but we deal exclusively in
         * points (except in SDL_GL_GetDrawableSize.) */
        CGSize size = [uimode size];
        int w = (int)(size.width / scale);
        int h = (int)(size.height / scale);

        /* Make sure the width/height are oriented correctly */
        if (isLandscape != (w > h)) {
            int tmp = w;
            w = h;
            h = tmp;
        }

        /* Add the native screen resolution. */
        UIKit_AddDisplayMode(display, w, h, uimode, addRotation);
    }
}

int
UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
{
    SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
    SDL_DisplayModeData *modedata = (SDL_DisplayModeData *)mode->driverdata;

    [data->uiscreen setCurrentMode:modedata->uiscreenmode];

    if (data->uiscreen == [UIScreen mainScreen]) {
        if (mode->w > mode->h) {
            if (!UIKit_IsDisplayLandscape(data->uiscreen)) {
                [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO];
            }
        } else if (mode->w < mode->h) {
            if (UIKit_IsDisplayLandscape(data->uiscreen)) {
                [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait animated:NO];
            }
        }
    }

    return 0;
}

void
UIKit_QuitModes(_THIS)
{
    /* Release Objective-C objects, so higher level doesn't free() them. */
    int i, j;
    for (i = 0; i < _this->num_displays; i++) {
        SDL_VideoDisplay *display = &_this->displays[i];

        UIKit_FreeDisplayModeData(&display->desktop_mode);
        for (j = 0; j < display->num_display_modes; j++) {
            SDL_DisplayMode *mode = &display->display_modes[j];
            UIKit_FreeDisplayModeData(mode);
        }

        SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
        [data->uiscreen release];
        SDL_free(data);
        display->driverdata = NULL;
    }
}

#endif /* SDL_VIDEO_DRIVER_UIKIT */

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