main.mm

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// yaze iOS Application
// Uses SDL2 and ImGui
//
// This file implements the iOS-specific entry point and UI management for yaze.
// It integrates with the modern Controller API and EditorManager infrastructure.
//
// Key components:
// - AppViewController: Main view controller managing the MTKView and Controller lifecycle
// - AppDelegate: iOS app lifecycle management and document picker integration
// - Touch gesture handlers: Maps iOS gestures to ImGui input events
//
// Updated to use:
// - Modern Controller::OnEntry/OnLoad/DoRender API
// - EditorManager for ROM management (no SharedRom singleton)
// - Proper SDL2 initialization for iOS
// - Updated ImGui backends (SDL2 renderer, not Metal directly)
 
#import <Foundation/Foundation.h>
 
#if TARGET_OS_OSX
#import <Cocoa/Cocoa.h>
#else
#import <UIKit/UIKit.h>
#endif
 
#import <Metal/Metal.h>
#import <MetalKit/MetalKit.h>
#import <UniformTypeIdentifiers/UniformTypeIdentifiers.h>
 
#include <string>
#include <vector>
#include <algorithm>
 
#include "app/controller.h"
#include "app/application.h"
#include "app/platform/app_delegate.h"
#include "app/platform/font_loader.h"
#include "app/platform/window.h"
#include "rom/rom.h"
 
#include "app/platform/sdl_compat.h"
 
#ifdef main
#undef main
#endif
 
#include "app/platform/view_controller.h"
#include "imgui/backends/imgui_impl_sdl2.h"
#include "imgui/backends/imgui_impl_sdlrenderer2.h"
#include "imgui/imgui.h"
 
// ----------------------------------------------------------------------------
// AppViewController
// ----------------------------------------------------------------------------
 
@implementation AppViewController
 
- (instancetype)initWithNibName:(nullable NSString *)nibNameOrNil
                         bundle:(nullable NSBundle *)nibBundleOrNil {
  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
 
  _device = MTLCreateSystemDefaultDevice();
  _commandQueue = [_device newCommandQueue];
 
  if (!self.device) {
    NSLog(@"Metal is not supported");
    abort();
  }
 
  // Initialize SDL for iOS
  SDL_SetMainReady();
#if TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
  SDL_iOSSetEventPump(SDL_TRUE);
#endif
  
  // Parse command line arguments
  int argc = NSProcessInfo.processInfo.arguments.count;
  char **argv = new char *[argc];
  for (int i = 0; i < argc; i++) {
    NSString *arg = NSProcessInfo.processInfo.arguments[i];
    const char *cString = [arg UTF8String];
    argv[i] = new char[strlen(cString) + 1];
    strcpy(argv[i], cString);
  }
 
  std::string rom_filename = "";
  if (argc > 1) {
    rom_filename = argv[1];
  }
  
  // Clean up argv
  for (int i = 0; i < argc; i++) {
    delete[] argv[i];
  }
  delete[] argv;
  
#if TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
  SDL_iOSSetEventPump(SDL_FALSE);
#endif
 
  // Enable native IME
  SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
 
  // Initialize Application singleton
  yaze::AppConfig config;
  config.rom_file = rom_filename;
  yaze::Application::Instance().Initialize(config);
  
  // Keep local reference to controller for property compatibility
  self.controller = yaze::Application::Instance().GetController();
 
  if (!self.controller) {
    NSLog(@"Failed to initialize application controller");
    abort();
  }
 
  // Setup gesture recognizers
  _hoverGestureRecognizer =
      [[UIHoverGestureRecognizer alloc] initWithTarget:self action:@selector(HoverGesture:)];
  [self.view addGestureRecognizer:_hoverGestureRecognizer];
 
  _pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self
                                                               action:@selector(HandlePinch:)];
  [self.view addGestureRecognizer:_pinchRecognizer];
 
  _longPressRecognizer =
      [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
  [self.view addGestureRecognizer:_longPressRecognizer];
 
  _swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self
                                                               action:@selector(HandleSwipe:)];
  _swipeRecognizer.direction =
      UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft;
  [self.view addGestureRecognizer:_swipeRecognizer];
  
  return self;
}
 
- (MTKView *)mtkView {
  return (MTKView *)self.view;
}
 
- (void)loadView {
  self.view = [[MTKView alloc] initWithFrame:CGRectMake(0, 0, 1200, 720)];
}
 
- (void)viewDidLoad {
  [super viewDidLoad];
 
  self.mtkView.device = self.device;
  self.mtkView.delegate = self;
}
 
- (void)drawInMTKView:(MTKView *)view {
  auto& app = yaze::Application::Instance();
  if (!app.IsReady() || !app.GetController()->IsActive()) return;
 
  // Update ImGui display size for iOS before Tick
  // Note: Tick() calls OnInput() then OnLoad() (NewFrame) then DoRender()
  // We want to update IO before NewFrame.
  // OnInput handles SDL events.
  
  ImGuiIO &io = ImGui::GetIO();
  io.DisplaySize.x = view.bounds.size.width;
  io.DisplaySize.y = view.bounds.size.height;
 
  CGFloat framebufferScale = view.window.screen.scale ?: UIScreen.mainScreen.scale;
  io.DisplayFramebufferScale = ImVec2(framebufferScale, framebufferScale);
 
  app.Tick();
}
 
- (void)mtkView:(MTKView *)view drawableSizeWillChange:(CGSize)size {
}
 
// ----------------------------------------------------------------------------
// Input processing
// ----------------------------------------------------------------------------
 
#if !TARGET_OS_OSX
 
// This touch mapping is super cheesy/hacky. We treat any touch on the screen
// as if it were a depressed left mouse button, and we don't bother handling
// multitouch correctly at all. This causes the "cursor" to behave very erratically
// when there are multiple active touches. But for demo purposes, single-touch
// interaction actually works surprisingly well.
- (void)UpdateIOWithTouchEvent:(UIEvent *)event {
  UITouch *anyTouch = event.allTouches.anyObject;
  CGPoint touchLocation = [anyTouch locationInView:self.view];
  ImGuiIO &io = ImGui::GetIO();
  io.AddMouseSourceEvent(ImGuiMouseSource_TouchScreen);
  io.AddMousePosEvent(touchLocation.x, touchLocation.y);
 
  BOOL hasActiveTouch = NO;
  for (UITouch *touch in event.allTouches) {
    if (touch.phase != UITouchPhaseEnded && touch.phase != UITouchPhaseCancelled) {
      hasActiveTouch = YES;
      break;
    }
  }
  io.AddMouseButtonEvent(0, hasActiveTouch);
}
 
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
  [self UpdateIOWithTouchEvent:event];
}
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
  [self UpdateIOWithTouchEvent:event];
}
- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
  [self UpdateIOWithTouchEvent:event];
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
  [self UpdateIOWithTouchEvent:event];
}
 
- (void)HoverGesture:(UIHoverGestureRecognizer *)gesture {
  ImGuiIO &io = ImGui::GetIO();
  io.AddMouseSourceEvent(ImGuiMouseSource_TouchScreen);
  // Cast to UIGestureRecognizer to UIGestureRecognizer to get locationInView
  UIGestureRecognizer *gestureRecognizer = (UIGestureRecognizer *)gesture;
  if (gesture.zOffset < 0.50) {
    io.AddMousePosEvent([gestureRecognizer locationInView:self.view].x,
                        [gestureRecognizer locationInView:self.view].y);
  }
}
 
- (void)HandlePinch:(UIPinchGestureRecognizer *)gesture {
  ImGuiIO &io = ImGui::GetIO();
  io.AddMouseSourceEvent(ImGuiMouseSource_TouchScreen);
  io.AddMouseWheelEvent(0.0f, gesture.scale);
  UIGestureRecognizer *gestureRecognizer = (UIGestureRecognizer *)gesture;
  io.AddMousePosEvent([gestureRecognizer locationInView:self.view].x,
                      [gestureRecognizer locationInView:self.view].y);
}
 
- (void)HandleSwipe:(UISwipeGestureRecognizer *)gesture {
  ImGuiIO &io = ImGui::GetIO();
  io.AddMouseSourceEvent(ImGuiMouseSource_TouchScreen);
  if (gesture.direction == UISwipeGestureRecognizerDirectionRight) {
    io.AddMouseWheelEvent(1.0f, 0.0f);  // Swipe Right
  } else if (gesture.direction == UISwipeGestureRecognizerDirectionLeft) {
    io.AddMouseWheelEvent(-1.0f, 0.0f);  // Swipe Left
  }
  UIGestureRecognizer *gestureRecognizer = (UIGestureRecognizer *)gesture;
  io.AddMousePosEvent([gestureRecognizer locationInView:self.view].x,
                      [gestureRecognizer locationInView:self.view].y);
}
 
- (void)handleLongPress:(UILongPressGestureRecognizer *)gesture {
  ImGuiIO &io = ImGui::GetIO();
  io.AddMouseSourceEvent(ImGuiMouseSource_TouchScreen);
  io.AddMouseButtonEvent(1, gesture.state == UIGestureRecognizerStateBegan);
  UIGestureRecognizer *gestureRecognizer = (UIGestureRecognizer *)gesture;
  io.AddMousePosEvent([gestureRecognizer locationInView:self.view].x,
                      [gestureRecognizer locationInView:self.view].y);
}
 
#endif
 
@end
 
// ----------------------------------------------------------------------------
// AppDelegate
// ----------------------------------------------------------------------------
 
#if TARGET_OS_OSX
 
@interface AppDelegate : NSObject <NSApplicationDelegate>
@property(nonatomic, strong) NSWindow *window;
@end
 
@implementation AppDelegate
 
- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {
  return YES;
}
 
- (instancetype)init {
  if (self = [super init]) {
    NSViewController *rootViewController = [[AppViewController alloc] initWithNibName:nil
                                                                               bundle:nil];
    self.window = [[NSWindow alloc]
        initWithContentRect:NSZeroRect
                  styleMask:NSWindowStyleMaskTitled | NSWindowStyleMaskClosable |
                            NSWindowStyleMaskResizable | NSWindowStyleMaskMiniaturizable
                    backing:NSBackingStoreBuffered
                      defer:NO];
    self.window.contentViewController = rootViewController;
    [self.window center];
    [self.window makeKeyAndOrderFront:self];
  }
  return self;
}
 
@end
 
#else
 
@implementation AppDelegate
 
- (BOOL)application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary<UIApplicationLaunchOptionsKey, id> *)launchOptions {
  UIViewController *rootViewController = [[AppViewController alloc] init];
  self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
  self.window.rootViewController = rootViewController;
  [self.window makeKeyAndVisible];
  return YES;
}
 
- (void)applicationWillTerminate:(UIApplication *)application {
  yaze::Application::Instance().Shutdown();
}
 
- (void)PresentDocumentPickerWithCompletionHandler:
    (void (^)(NSString *selectedFile))completionHandler {
  self.completionHandler = completionHandler;
 
  NSArray *documentTypes = @[ [UTType typeWithIdentifier:@"org.halext.sfc"] ];
  UIViewController *rootViewController = self.window.rootViewController;
  _documentPicker =
      [[UIDocumentPickerViewController alloc] initForOpeningContentTypes:documentTypes];
  _documentPicker.delegate = self;
  _documentPicker.modalPresentationStyle = UIModalPresentationFormSheet;
 
  [rootViewController presentViewController:_documentPicker animated:YES completion:nil];
}
 
- (void)documentPicker:(UIDocumentPickerViewController *)controller
    didPickDocumentsAtURLs:(NSArray<NSURL *> *)urls {
  NSURL *selectedFileURL = [urls firstObject];
 
  if (self.completionHandler) {
    if (selectedFileURL) {
      self.completionHandler(selectedFileURL.path);
      
      // Create a temporary file path
      NSString *tempDir = NSTemporaryDirectory();
      NSString *fileName = [selectedFileURL lastPathComponent];
      NSString *tempPath = [tempDir stringByAppendingPathComponent:fileName];
      NSURL *tempURL = [NSURL fileURLWithPath:tempPath];
      
      // Copy the file to the temporary location
      NSError *error = nil;
      [[NSFileManager defaultManager] removeItemAtURL:tempURL error:nil]; // Remove if exists
      
      [selectedFileURL startAccessingSecurityScopedResource];
      BOOL success = [[NSFileManager defaultManager] copyItemAtURL:selectedFileURL toURL:tempURL error:&error];
      [selectedFileURL stopAccessingSecurityScopedResource];
      
      if (success) {
        std::string cppPath = std::string([tempPath UTF8String]);
        NSLog(@"ROM copied to temporary path: %s", cppPath.c_str());
        
        // Load ROM using modern API via Application singleton
        // This triggers the full editor loading pipeline (sessions, startup actions, etc.)
        yaze::Application::Instance().LoadRom(cppPath);
      } else {
        NSLog(@"Failed to copy ROM to temp directory: %@", error);
      }
    } else {
      self.completionHandler(@"");
    }
  }
  self.completionHandler = nil;
  [controller dismissViewControllerAnimated:YES completion:nil];
}
 
- (void)documentPickerWasCancelled:(UIDocumentPickerViewController *)controller {
  if (self.completionHandler) {
    self.completionHandler(@"");
  }
  self.completionHandler = nil;
  [controller dismissViewControllerAnimated:YES completion:nil];
}
 
@end
 
#endif
 
// ----------------------------------------------------------------------------
// Application main() function
// ----------------------------------------------------------------------------
 
#if TARGET_OS_OSX
int main(int argc, const char *argv[]) { return NSApplicationMain(argc, argv); }
#else
 
int main(int argc, char *argv[]) {
  @autoreleasepool {
    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
  }
}
 
#endif