/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2011 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

#include "SDL_syswm.h"

#include "SDL_video.h"

#include "SDL_mouse.h"

#include "SDL_assert.h"

#include "../SDL_sysvideo.h"

#include "../SDL_pixels_c.h"

#include "../../events/SDL_events_c.h"

#include "SDL_uikitvideo.h"

#include "SDL_uikitevents.h"

#include "SDL_uikitwindow.h"

#import "SDL_uikitappdelegate.h"

#import "SDL_uikitopenglview.h"

#include <Foundation/Foundation.h>

@implementation SDL_uikitviewcontroller

- (id)initWithSDLWindow:(SDL_Window *)_window {

    [self init];

    self->window = _window;

    return self;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)orient {

    return YES;

}

- (void)loadView  {

    // do nothing.

}

// Send a resized event when the orientation changes.

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {

    SDL_WindowData *data = self->window->driverdata;

    UIWindow *uiwindow = data->uiwindow;

    CGRect frame = [uiwindow frame];

    const CGSize size = frame.size;

    int w, h;

    switch (toInterfaceOrientation) {

        case UIInterfaceOrientationPortrait:

        case UIInterfaceOrientationPortraitUpsideDown:

            w = (size.width < size.height) ? size.width : size.height;

            h = (size.width > size.height) ? size.width : size.height;

            break;

        case UIInterfaceOrientationLandscapeLeft:

        case UIInterfaceOrientationLandscapeRight:

            w = (size.width > size.height) ? size.width : size.height;

            h = (size.width < size.height) ? size.width : size.height;

            break;

        default:

            SDL_assert(0 && "Unexpected interface orientation!");

            return;

    }

    frame.size.width = w;

    frame.size.height = h;

    SDL_SendWindowEvent(self->window, SDL_WINDOWEVENT_RESIZED, w, h);

}

@end

static int SetupWindowData(_THIS, SDL_Window *window, UIWindow *uiwindow, SDL_bool created)

{

    SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);

    UIScreen *uiscreen = (UIScreen *) display->driverdata;

    SDL_WindowData *data;

    /* Allocate the window data */

    data = (SDL_WindowData *)SDL_malloc(sizeof(*data));

    if (!data) {

        SDL_OutOfMemory();

        return -1;

    }

    data->uiwindow = uiwindow;

    data->viewcontroller = nil;

    data->view = nil;

    /* Fill in the SDL window with the window data */

    {

        window->x = 0;

        window->y = 0;

        window->w = (int)uiwindow.frame.size.width;

        window->h = (int)uiwindow.frame.size.height;

    }

    window->driverdata = data;

    // !!! FIXME: should we force this? Shouldn't specifying FULLSCREEN

    // !!! FIXME:  imply BORDERLESS?

    window->flags |= SDL_WINDOW_FULLSCREEN;        /* window is always fullscreen */

    window->flags |= SDL_WINDOW_SHOWN;            /* only one window on iOS, always shown */

    // SDL_WINDOW_BORDERLESS controls whether status bar is hidden.

    // This is only set if the window is on the main screen. Other screens

    //  just force the window to have the borderless flag.

    if ([UIScreen mainScreen] != uiscreen) {

        window->flags &= ~SDL_WINDOW_RESIZABLE;  // window is NEVER resizeable

        window->flags &= ~SDL_WINDOW_INPUT_FOCUS;  // never has input focus

        window->flags |= SDL_WINDOW_BORDERLESS;  // never has a status bar.

    } else {

        window->flags |= SDL_WINDOW_INPUT_FOCUS;  // always has input focus

        if (window->flags & SDL_WINDOW_BORDERLESS) {

            [UIApplication sharedApplication].statusBarHidden = YES;

        } else {

            [UIApplication sharedApplication].statusBarHidden = NO;

        }

        const CGSize uisize = [[uiscreen currentMode] size];

        const UIDeviceOrientation o = [[UIDevice currentDevice] orientation];

        const BOOL landscape = (o == UIDeviceOrientationLandscapeLeft) ||

                                   (o == UIDeviceOrientationLandscapeRight);

        const BOOL rotate = ( ((window->w > window->h) && (!landscape)) ||

                              ((window->w < window->h) && (landscape)) );

        if (window->flags & SDL_WINDOW_RESIZABLE) {

            // The View Controller will handle rotating the view when the

            //  device orientation changes. We expose these as resize events.

            SDL_uikitviewcontroller *controller;

            controller = [SDL_uikitviewcontroller alloc];

            data->viewcontroller = [controller initWithSDLWindow:window];

            [data->viewcontroller setTitle:@"SDL App"];  // !!! FIXME: hook up SDL_SetWindowTitle()

            // !!! FIXME: if (rotate), force a "resize" right at the start

        } else {

            // Rotate the view if we have to, but only on the main screen

            //  (presumably, an external display doesn't report orientation).

            if (rotate) {

                #define D2R(x) (M_PI * (x) / 180.0)   // degrees to radians.

                [uiwindow setTransform:CGAffineTransformIdentity];

                [uiwindow setTransform:CGAffineTransformMakeRotation(D2R(90))];

                #undef D2R

            }

        }

    }

    return 0;

}

int

UIKit_CreateWindow(_THIS, SDL_Window *window)

{

    SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);

    UIScreen *uiscreen = (UIScreen *) display->driverdata;

    // SDL currently puts this window at the start of display's linked list. We rely on this.

    SDL_assert(_this->windows == window);

    /* We currently only handle a single window per display on iOS */

    if (window->next != NULL) {

        SDL_SetError("Only one window allowed per display.");

        return -1;

    }

    // Non-mainscreen windows must be force to borderless, as there's no

    //  status bar there, and we want to get the right dimensions later in

    //  this function.

    if ([UIScreen mainScreen] != uiscreen) {

        window->flags |= SDL_WINDOW_BORDERLESS;

    }

    // If monitor has a resolution of 0x0 (hasn't been explicitly set by the

    //  user, so it's in standby), try to force the display to a resolution

    //  that most closely matches the desired window size.

    if (SDL_UIKit_supports_multiple_displays) {

        const CGSize origsize = [[uiscreen currentMode] size];

        if ((origsize.width == 0.0f) && (origsize.height == 0.0f)) {

            if (display->num_display_modes == 0) {

                _this->GetDisplayModes(_this, display);

            }

            int i;

            const SDL_DisplayMode *bestmode = NULL;

            for (i = display->num_display_modes; i >= 0; i--) {

                const SDL_DisplayMode *mode = &display->display_modes[i];

                if ((mode->w >= window->w) && (mode->h >= window->h))

                    bestmode = mode;

            }

            if (bestmode) {

                UIScreenMode *uimode = (UIScreenMode *) bestmode->driverdata;

                [uiscreen setCurrentMode:uimode];

                display->desktop_mode = *bestmode;

                display->current_mode = *bestmode;

            }

        }

    }

    /* ignore the size user requested, and make a fullscreen window */

    // !!! FIXME: can we have a smaller view?

    UIWindow *uiwindow = [UIWindow alloc];

    if (window->flags & SDL_WINDOW_BORDERLESS)

        uiwindow = [uiwindow initWithFrame:[uiscreen bounds]];

    else

        uiwindow = [uiwindow initWithFrame:[uiscreen applicationFrame]];

    if (SDL_UIKit_supports_multiple_displays) {

        [uiwindow setScreen:uiscreen];

    }

    if (SetupWindowData(_this, window, uiwindow, SDL_TRUE) < 0) {

        [uiwindow release];

        return -1;

    }    

    return 1;

}

void

UIKit_DestroyWindow(_THIS, SDL_Window * window) {

    SDL_WindowData *data = (SDL_WindowData *)window->driverdata;

    if (data) {

        [data->viewcontroller release];

        [data->uiwindow release];

        SDL_free(data);

        window->driverdata = NULL;

    }

}

SDL_bool

UIKit_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info)

{

    UIWindow *uiwindow = ((SDL_WindowData *) window->driverdata)->uiwindow;

    if (info->version.major <= SDL_MAJOR_VERSION) {

        info->subsystem = SDL_SYSWM_UIKIT;

        info->info.uikit.window = uiwindow;

        return SDL_TRUE;

    } else {

        SDL_SetError("Application not compiled with SDL %d.%d\n",

                     SDL_MAJOR_VERSION, SDL_MINOR_VERSION);

        return SDL_FALSE;

    }

}

/* vi: set ts=4 sw=4 expandtab: */