/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2013-2014 - Jason Fetters
 * 
 *  RetroArch is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#include <string.h>

#include "../common/RetroArch_Apple.h"
#include "../../input/apple_input.h"
#include "../../settings_data.h"
#include "../common/apple_gamecontroller.h"
#include "menu.h"

#import "views.h"
#include "bluetooth/btpad.h"
#include "bluetooth/btdynamic.h"
#include "bluetooth/btpad.h"

#include "../../file.h"

apple_frontend_settings_t apple_frontend_settings;

int get_ios_version_major(void)
{
   static int version = -1;
   
   if (version < 0)
      version = (int)[[[UIDevice currentDevice] systemVersion] floatValue];
   
   return version;
}

const void* apple_get_frontend_settings(void)
{
   static rarch_setting_t settings[9];
   
   if (settings[0].type == ST_NONE)
   {
       const char *GROUP_NAME = "Frontend Settings";
       const char *SUBGROUP_NAME = "Frontend";
      settings[0] = setting_data_group_setting(ST_GROUP, "Frontend Settings");
      settings[1] = setting_data_group_setting(ST_SUB_GROUP, "Frontend");
      settings[2] = setting_data_string_setting(ST_STRING, "ios_btmode", "Bluetooth Input Type", apple_frontend_settings.bluetooth_mode,
                                                 sizeof(apple_frontend_settings.bluetooth_mode), "none", GROUP_NAME, SUBGROUP_NAME, NULL);

      // Set ios_btmode options based on runtime environment
      if (btstack_try_load())
         settings[2].values = "icade|keyboard|small_keyboard|btstack";
      else
         settings[2].values = "icade|keyboard|small_keyboard";

      settings[3] = setting_data_string_setting(ST_STRING, "ios_orientations", "Screen Orientations", apple_frontend_settings.orientations,
                                                 sizeof(apple_frontend_settings.orientations), "both", GROUP_NAME, SUBGROUP_NAME, NULL);
      settings[3].values = "both|landscape|portrait";
      settings[4] = setting_data_group_setting(ST_END_SUB_GROUP, 0);
      settings[5] = setting_data_group_setting(ST_END_GROUP, 0);
   }
   
   return settings;
}


// Input helpers: This is kept here because it needs objective-c
static void handle_touch_event(NSArray* touches)
{
   int i;
   const float scale = [[UIScreen mainScreen] scale];

   g_current_input_data.touch_count = 0;
   
   for(i = 0; i < touches.count && g_current_input_data.touch_count < MAX_TOUCHES; i ++)
   {
      UITouch* touch = [touches objectAtIndex:i];
      
      if (touch.view != [RAGameView get].view)
         continue;

      const CGPoint coord = [touch locationInView:[touch view]];

      if (touch.phase != UITouchPhaseEnded && touch.phase != UITouchPhaseCancelled)
      {
         g_current_input_data.touches[g_current_input_data.touch_count   ].screen_x = coord.x * scale;
         g_current_input_data.touches[g_current_input_data.touch_count ++].screen_y = coord.y * scale;
      }
   }
}

// iO7 Keyboard support
@interface UIEvent(iOS7Keyboard)
@property(readonly, nonatomic) long long _keyCode;
@property(readonly, nonatomic) _Bool _isKeyDown;
@property(retain, nonatomic) NSString *_privateInput;
@property(nonatomic) long long _modifierFlags;
- (struct __IOHIDEvent { }*)_hidEvent;
@end

@interface UIApplication(iOS7Keyboard)
- (id)_keyCommandForEvent:(id)event;
@end

@interface RApplication : UIApplication
@end

@implementation RApplication

// Keyboard handler for iOS 7
- (id)_keyCommandForEvent:(UIEvent*)event
{
   int i;
   // This gets called twice with the same timestamp for each keypress, that's fine for polling
   // but is bad for business with events.
   static double last_time_stamp;
   
   if (last_time_stamp == event.timestamp)
      return [super _keyCommandForEvent:event];
   last_time_stamp = event.timestamp;
   
   // If the _hidEvent is null, [event _keyCode] will crash. (This happens with the on screen keyboard.)
   if (event._hidEvent)
   {
      NSString* ch = (NSString*)event._privateInput;
      
      if (!ch || ch.length == 0)
         apple_input_keyboard_event(event._isKeyDown, (uint32_t)event._keyCode, 0, (uint32_t)event._modifierFlags);
      else
      {
         apple_input_keyboard_event(event._isKeyDown, (uint32_t)event._keyCode, [ch characterAtIndex:0], (uint32_t)event._modifierFlags);
         
         for (i = 1; i < ch.length; i++)
            apple_input_keyboard_event(event._isKeyDown, 0, [ch characterAtIndex:i], (uint32_t)event._modifierFlags);
      }
   }

   return [super _keyCommandForEvent:event];
}

- (void)sendEvent:(UIEvent *)event
{
   [super sendEvent:event];
   
   if (event.allTouches.count)
      handle_touch_event(event.allTouches.allObjects);

   if (!(IOS_IS_VERSION_7_OR_HIGHER()) && [event respondsToSelector:@selector(_gsEvent)])
   {
      // Stolen from: http://nacho4d-nacho4d.blogspot.com/2012/01/catching-keyboard-events-in-ios.html
      const uint8_t* eventMem = objc_unretainedPointer([event performSelector:@selector(_gsEvent)]);
      int eventType = eventMem ? *(int*)&eventMem[8] : 0;
      
      if (eventType == GSEVENT_TYPE_KEYDOWN || eventType == GSEVENT_TYPE_KEYUP)
         apple_input_keyboard_event(eventType == GSEVENT_TYPE_KEYDOWN, *(uint16_t*)&eventMem[0x3C], 0, 0);
   }
}

@end

@implementation RetroArch_iOS
{
   UIWindow* _window;
   NSString* _path;
}

+ (RetroArch_iOS*)get
{
   return (RetroArch_iOS*)[[UIApplication sharedApplication] delegate];
}

- (void)applicationDidFinishLaunching:(UIApplication *)application
{
   const rarch_setting_t* frontend_settings;
   const core_info_list_t* core_list;
   const char *path;
    
   apple_platform = self;
   [self setDelegate:self];

   // Setup window
   _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
   [self showPauseMenu:self];
   [_window makeKeyAndVisible];

   // Build system paths and test permissions
   self.documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    fill_pathname_join(g_defaults.system_dir, self.documentsDirectory.UTF8String, ".RetroArch", sizeof(g_defaults.system_dir));
   
    strlcpy(g_defaults.menu_config_dir, g_defaults.system_dir, sizeof(g_defaults.menu_config_dir));
    fill_pathname_join(g_defaults.config_path, g_defaults.menu_config_dir, "retroarch.cfg", sizeof(g_defaults.config_path));
    fill_pathname_join(g_defaults.core_dir, NSBundle.mainBundle.bundlePath.UTF8String, "modules", sizeof(g_defaults.core_dir));
    
    strlcpy(g_defaults.sram_dir, g_defaults.system_dir, sizeof(g_defaults.sram_dir));
    strlcpy(g_defaults.savestate_dir, g_defaults.system_dir, sizeof(g_defaults.savestate_dir));
    
    path = (const char*)self.documentsDirectory.UTF8String;
    path_mkdir(path);
    
    if (access(path, 0755) != 0)
    {
       char msg[256];
       snprintf(msg, sizeof(msg), "Failed to create or access base directory: %s", self.documentsDirectory.UTF8String);
       apple_display_alert(msg, "Error");
    }
    else
    {
        path = g_defaults.system_dir;
        path_mkdir(path);
        
        if (access(path, 0755) != 0)
        {
            char msg[256];
            snprintf(msg, sizeof(msg), "Failed to create or access system directory: %s", g_defaults.system_dir);
            apple_display_alert(msg, "Error");
        }
        else
           [self pushViewController:[RAMainMenu new] animated:YES];
    }
   
   // Warn if there are no cores present
   core_info_set_core_path(g_defaults.core_dir);
   core_info_set_config_path(g_defaults.menu_config_dir);
   core_list = (const core_info_list_t*)core_info_list_get();
   
   if (!core_list || core_list->count == 0)
      apple_display_alert("No libretro cores were found. You will not be able to run any content.", "Warning");
   
   apple_gamecontroller_init();
   
   // Load system config
   frontend_settings = (const rarch_setting_t*)apple_get_frontend_settings();
   setting_data_reset(frontend_settings);
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
   apple_start_iteration();
}

- (void)applicationWillResignActive:(UIApplication *)application
{
   apple_stop_iteration();
}

-(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
   NSString* filename = (NSString*)url.path.lastPathComponent;

   NSError* error = nil;
   [[NSFileManager defaultManager] moveItemAtPath:[url path] toPath:[self.documentsDirectory stringByAppendingPathComponent:filename] error:&error];
   
   if (error)
      printf("%s\n", [[error description] UTF8String]);
   
   return true;
}

// UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
   apple_input_reset_icade_buttons();
   [self setToolbarHidden:![[viewController toolbarItems] count] animated:YES];
   
   // Workaround to keep frontend settings fresh
   [self refreshSystemConfig];
}

- (void)showGameView
{
   [self popToRootViewControllerAnimated:NO];
   [self setToolbarHidden:true animated:NO];
   [[UIApplication sharedApplication] setStatusBarHidden:true withAnimation:UIStatusBarAnimationNone];
   [[UIApplication sharedApplication] setIdleTimerDisabled:true];
   [_window setRootViewController:[RAGameView get]];
   g_extern.is_paused = false;
}

- (IBAction)showPauseMenu:(id)sender
{
   g_extern.is_paused = true;
   [[UIApplication sharedApplication] setStatusBarHidden:false withAnimation:UIStatusBarAnimationNone];
   [[UIApplication sharedApplication] setIdleTimerDisabled:false];
   [_window setRootViewController:self];
}

- (void)loadingCore:(NSString*)core withFile:(const char*)file
{
   (void)[[RACoreSettingsMenu alloc] initWithCore:core];

   btpad_set_inquiry_state(false);

   [self refreshSystemConfig];
   [self showGameView];
}

- (void)unloadingCore
{
   [self showPauseMenu:self];
   
   btpad_set_inquiry_state(true);
}

- (void)refreshSystemConfig
{
   // Get enabled orientations
   apple_frontend_settings.orientation_flags = UIInterfaceOrientationMaskAll;
   
   if (strcmp(apple_frontend_settings.orientations, "landscape") == 0)
      apple_frontend_settings.orientation_flags = UIInterfaceOrientationMaskLandscape;
   else if (strcmp(apple_frontend_settings.orientations, "portrait") == 0)
      apple_frontend_settings.orientation_flags = UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown;

   // Set bluetooth mode
    bool small_keyboard = !(strcmp(apple_frontend_settings.bluetooth_mode, "small_keyboard"));
    bool is_icade = !(strcmp(apple_frontend_settings.bluetooth_mode, "icade"));
    bool is_btstack = !(strcmp(apple_frontend_settings.bluetooth_mode, "btstack"));
       
    apple_input_enable_small_keyboard(small_keyboard);
    apple_input_enable_icade(is_icade);
    btstack_set_poweron(is_btstack);
}

@end

int main(int argc, char *argv[])
{
   @autoreleasepool {
      return UIApplicationMain(argc, argv, NSStringFromClass([RApplication class]), NSStringFromClass([RetroArch_iOS class]));
   }
}