/*
  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_syswm.h"
#include "SDL_video.h"
#include "SDL_mouse.h"
#include "SDL_assert.h"
#include "SDL_hints.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_uikitmodes.h"
#include "SDL_uikitwindow.h"
#import "SDL_uikitappdelegate.h"

#import "SDL_uikitview.h"

#include <Foundation/Foundation.h>

@implementation SDL_WindowData

@synthesize uiwindow;
@synthesize viewcontroller;
@synthesize views;

- (instancetype)init
{
    if ((self = [super init])) {
        views = [NSMutableArray new];
    }

    return self;
}

@end

@interface SDL_uikitwindow : UIWindow

- (void)layoutSubviews;

@end

@implementation SDL_uikitwindow

- (void)layoutSubviews
{
    /* Workaround to fix window orientation issues in iOS 8+. */
    self.frame = self.screen.bounds;
    [super layoutSubviews];
}

@end


static int SetupWindowData(_THIS, SDL_Window *window, UIWindow *uiwindow, SDL_bool created)
{
    SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
    SDL_DisplayData *displaydata = (__bridge SDL_DisplayData *) display->driverdata;
    SDL_uikitview *view;

    CGRect frame = UIKit_ComputeViewFrame(window, displaydata.uiscreen);
    int width  = (int) frame.size.width;
    int height = (int) frame.size.height;

    SDL_WindowData *data = [[SDL_WindowData alloc] init];
    if (!data) {
        return SDL_OutOfMemory();
    }

    window->driverdata = (void *) CFBridgingRetain(data);

    data.uiwindow = uiwindow;

    /* only one window on iOS, always shown */
    window->flags &= ~SDL_WINDOW_HIDDEN;

    if (displaydata.uiscreen == [UIScreen mainScreen]) {
        window->flags |= SDL_WINDOW_INPUT_FOCUS;  /* always has input focus */
    } else {
        window->flags &= ~SDL_WINDOW_RESIZABLE;  /* window is NEVER resizable */
        window->flags &= ~SDL_WINDOW_INPUT_FOCUS;  /* never has input focus */
        window->flags |= SDL_WINDOW_BORDERLESS;  /* never has a status bar. */
    }

    if (displaydata.uiscreen == [UIScreen mainScreen]) {
        NSUInteger orients = UIKit_GetSupportedOrientations(window);
        BOOL supportsLandscape = (orients & UIInterfaceOrientationMaskLandscape) != 0;
        BOOL supportsPortrait = (orients & (UIInterfaceOrientationMaskPortrait|UIInterfaceOrientationMaskPortraitUpsideDown)) != 0;

        /* Make sure the width/height are oriented correctly */
        if ((width > height && !supportsLandscape) || (height > width && !supportsPortrait)) {
            int temp = width;
            width = height;
            height = temp;
        }
    }

    window->x = 0;
    window->y = 0;
    window->w = width;
    window->h = height;

    /* The View Controller will handle rotating the view when the device
     * orientation changes. This will trigger resize events, if appropriate. */
    data.viewcontroller = [[SDL_uikitviewcontroller alloc] initWithSDLWindow:window];

    /* The window will initially contain a generic view so resizes, touch events,
     * etc. can be handled without an active OpenGL view/context. */
    view = [[SDL_uikitview alloc] initWithFrame:frame];

    /* Sets this view as the controller's view, and adds the view to the window
     * heirarchy. */
    [view setSDLWindow:window];

    /* Make this window the current mouse focus for touch input */
    if (displaydata.uiscreen == [UIScreen mainScreen]) {
        SDL_SetMouseFocus(window);
        SDL_SetKeyboardFocus(window);
    }

    return 0;
}

int
UIKit_CreateWindow(_THIS, SDL_Window *window)
{
    @autoreleasepool {
        SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
        SDL_DisplayData *data = (__bridge SDL_DisplayData *) display->driverdata;
        const CGSize origsize = data.uiscreen.currentMode.size;

        /* 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) {
            return SDL_SetError("Only one window allowed per display.");
        }

        /* 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 ((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) {
                SDL_DisplayModeData *modedata = (__bridge SDL_DisplayModeData *)bestmode->driverdata;
                [data.uiscreen setCurrentMode:modedata.uiscreenmode];

                /* desktop_mode doesn't change here (the higher level will
                 * use it to set all the screens back to their defaults
                 * upon window destruction, SDL_Quit(), etc. */
                display->current_mode = *bestmode;
            }
        }

        if (data.uiscreen == [UIScreen mainScreen]) {
            NSUInteger orientations = UIKit_GetSupportedOrientations(window);
            UIApplication *app = [UIApplication sharedApplication];

            if (window->flags & (SDL_WINDOW_FULLSCREEN|SDL_WINDOW_BORDERLESS)) {
                app.statusBarHidden = YES;
            } else {
                app.statusBarHidden = NO;
            }
        }

        /* ignore the size user requested, and make a fullscreen window */
        /* !!! FIXME: can we have a smaller view? */
        UIWindow *uiwindow = [[SDL_uikitwindow alloc] initWithFrame:data.uiscreen.bounds];

        /* put the window on an external display if appropriate. */
        if (data.uiscreen != [UIScreen mainScreen]) {
            [uiwindow setScreen:data.uiscreen];
        }

        if (SetupWindowData(_this, window, uiwindow, SDL_TRUE) < 0) {
            return -1;
        }
    }

    return 1;
}

void
UIKit_SetWindowTitle(_THIS, SDL_Window * window)
{
    @autoreleasepool {
        SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
        data.viewcontroller.title = @(window->title);
    }
}

void
UIKit_ShowWindow(_THIS, SDL_Window * window)
{
    @autoreleasepool {
        SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
        [data.uiwindow makeKeyAndVisible];
    }
}

void
UIKit_HideWindow(_THIS, SDL_Window * window)
{
    @autoreleasepool {
        SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
        data.uiwindow.hidden = YES;
    }
}

void
UIKit_RaiseWindow(_THIS, SDL_Window * window)
{
    /* We don't currently offer a concept of "raising" the SDL window, since
     * we only allow one per display, in the iOS fashion.
     * However, we use this entry point to rebind the context to the view
     * during OnWindowRestored processing. */
    _this->GL_MakeCurrent(_this, _this->current_glwin, _this->current_glctx);
}

static void
UIKit_UpdateWindowBorder(_THIS, SDL_Window * window)
{
    SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;
    SDL_uikitviewcontroller *viewcontroller = data.viewcontroller;

    if (data.uiwindow.screen == [UIScreen mainScreen]) {
        if (window->flags & (SDL_WINDOW_FULLSCREEN | SDL_WINDOW_BORDERLESS)) {
            [UIApplication sharedApplication].statusBarHidden = YES;
        } else {
            [UIApplication sharedApplication].statusBarHidden = NO;
        }

        /* iOS 7+ won't update the status bar until we tell it to. */
        if ([viewcontroller respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
            [viewcontroller setNeedsStatusBarAppearanceUpdate];
        }
    }

    /* Update the view's frame to account for the status bar change. */
    viewcontroller.view.frame = UIKit_ComputeViewFrame(window, data.uiwindow.screen);
    [viewcontroller.view setNeedsLayout];
    [viewcontroller.view layoutIfNeeded];
}

void
UIKit_SetWindowBordered(_THIS, SDL_Window * window, SDL_bool bordered)
{
    @autoreleasepool {
        UIKit_UpdateWindowBorder(_this, window);
    }
}

void
UIKit_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display, SDL_bool fullscreen)
{
    @autoreleasepool {
        UIKit_UpdateWindowBorder(_this, window);
    }
}

void
UIKit_DestroyWindow(_THIS, SDL_Window * window)
{
    @autoreleasepool {
        if (window->driverdata != NULL) {
            SDL_WindowData *data = (SDL_WindowData *) CFBridgingRelease(window->driverdata);
            [data.viewcontroller stopAnimation];
        }
    }
    window->driverdata = NULL;
}

SDL_bool
UIKit_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info)
{
    @autoreleasepool {
        SDL_WindowData *data = (__bridge SDL_WindowData *) window->driverdata;

        if (info->version.major <= SDL_MAJOR_VERSION) {
            info->subsystem = SDL_SYSWM_UIKIT;
            info->info.uikit.window = data.uiwindow;
            return SDL_TRUE;
        } else {
            SDL_SetError("Application not compiled with SDL %d.%d\n",
                         SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
            return SDL_FALSE;
        }
    }
}

NSUInteger
UIKit_GetSupportedOrientations(SDL_Window * window)
{
    const char *hint = SDL_GetHint(SDL_HINT_ORIENTATIONS);
    NSUInteger orientationMask = 0;

    @autoreleasepool {
        if (hint != NULL) {
            NSArray *orientations = [@(hint) componentsSeparatedByString:@" "];

            if ([orientations containsObject:@"LandscapeLeft"]) {
                orientationMask |= UIInterfaceOrientationMaskLandscapeLeft;
            }
            if ([orientations containsObject:@"LandscapeRight"]) {
                orientationMask |= UIInterfaceOrientationMaskLandscapeRight;
            }
            if ([orientations containsObject:@"Portrait"]) {
                orientationMask |= UIInterfaceOrientationMaskPortrait;
            }
            if ([orientations containsObject:@"PortraitUpsideDown"]) {
                orientationMask |= UIInterfaceOrientationMaskPortraitUpsideDown;
            }
        }

        if (orientationMask == 0 && (window->flags & SDL_WINDOW_RESIZABLE)) {
            /* any orientation is okay. */
            orientationMask = UIInterfaceOrientationMaskAll;
        }

        if (orientationMask == 0) {
            if (window->w >= window->h) {
                orientationMask |= UIInterfaceOrientationMaskLandscape;
            }
            if (window->h >= window->w) {
                orientationMask |= (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown);
            }
        }

        /* Don't allow upside-down orientation on the phone, so answering calls is in the natural orientation */
        if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone) {
            orientationMask &= ~UIInterfaceOrientationMaskPortraitUpsideDown;
        }
    }

    return orientationMask;
}

int
SDL_iPhoneSetAnimationCallback(SDL_Window * window, int interval, void (*callback)(void*), void *callbackParam)
{
    if (!window || !window->driverdata) {
        return SDL_SetError("Invalid window");
    }

    @autoreleasepool {
        SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
        [data.viewcontroller setAnimationCallback:interval
                                         callback:callback
                                    callbackParam:callbackParam];
    }

    return 0;
}

#endif /* SDL_VIDEO_DRIVER_UIKIT */

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