//
//  KeyboardViewController.m
//  CustomKeyboard
//
//  Created by Mac on 2025/10/27.
//

#import "KeyboardViewController+Private.h"

#import "KBBackspaceUndoManager.h"
#import "KBChatLimitPopView.h"
#import "KBChatPanelView.h"
#import "KBFullAccessManager.h"
#import "KBFunctionView.h"
#import "KBInputBufferManager.h"
#import "KBKeyBoardMainView.h"
#import "KBKeyboardSubscriptionView.h"
#import "KBLocalizationManager.h"
#import "KBSettingView.h"
#import "KBSkinManager.h"
#import "KBSkinInstallBridge.h"
#import "KBSuggestionEngine.h"
#import "KBKeyboardLayoutResolver.h"
#import <SDWebImage/SDWebImage.h>

#if DEBUG
#import <mach/mach.h>
#endif

#if DEBUG
static NSInteger sKBKeyboardVCAliveCount = 0;

static uint64_t KBPhysFootprintBytes(void) {
  task_vm_info_data_t vmInfo;
  mach_msg_type_number_t count = TASK_VM_INFO_COUNT;
  kern_return_t kr = task_info(mach_task_self(), TASK_VM_INFO,
                               (task_info_t)&vmInfo, &count);
  if (kr != KERN_SUCCESS) {
    return 0;
  }
  return (uint64_t)vmInfo.phys_footprint;
}

static NSString *KBFormatMB(uint64_t bytes) {
  double mb = (double)bytes / 1024.0 / 1024.0;
  return [NSString stringWithFormat:@"%.1fMB", mb];
}
#endif

@implementation KeyboardViewController

{
  BOOL _kb_didTriggerLoginDeepLinkOnce;
  NSString *_kb_lastLoadedProfileId; // 记录上次加载的 profileId
#if DEBUG
  BOOL _kb_debugDidCountAlive;
#endif
}

- (void)viewDidLoad {
  [super viewDidLoad];
#if DEBUG
  if (!_kb_debugDidCountAlive) {
    _kb_debugDidCountAlive = YES;
    sKBKeyboardVCAliveCount += 1;
  }
  NSLog(@"[Keyboard] KeyboardViewController viewDidLoad alive=%ld self=%p mem=%@",
        (long)sKBKeyboardVCAliveCount, self, KBFormatMB(KBPhysFootprintBytes()));
#endif
  // 撤销删除是“上一段删除操作”的临时状态；键盘被系统回收/重建或跨页面回来时应当清空，避免误显示。
  [[KBBackspaceUndoManager shared] registerNonClearAction];
  [self setupUI];
  self.suggestionEngine = [KBSuggestionEngine shared];
  self.currentWord = @"";
  // 指定 HUD 的承载视图（扩展里无法取到 App 的 KeyWindow）
  [KBHUD setContainerView:self.view];
  // 绑定完全访问管理器，便于统一感知和联动网络开关
  [[KBFullAccessManager shared] bindInputController:self];
  self.kb_fullAccessObserverToken = [[NSNotificationCenter defaultCenter]
      addObserverForName:KBFullAccessChangedNotification
                  object:nil
                   queue:[NSOperationQueue mainQueue]
              usingBlock:^(__unused NSNotification *_Nonnull note){
                  // 如需，可在此刷新与完全访问相关的 UI
              }];

  // 皮肤变化时，立即应用
  __weak typeof(self) weakSelf = self;
  self.kb_skinObserverToken = [[NSNotificationCenter defaultCenter]
      addObserverForName:KBSkinDidChangeNotification
                  object:nil
                   queue:[NSOperationQueue mainQueue]
              usingBlock:^(__unused NSNotification *_Nonnull note) {
                __strong typeof(weakSelf) self = weakSelf;
                if (!self) {
                  return;
                }
                [self kb_applyTheme];
              }];

  // 语言变化时，重建键盘 UI（保证“App 语言=键盘语言”，并支持 App 内切换语言后键盘即时刷新）
  self.kb_localizationObserverToken = [[NSNotificationCenter defaultCenter]
      addObserverForName:KBLocalizationDidChangeNotification
                  object:nil
                   queue:[NSOperationQueue mainQueue]
              usingBlock:^(__unused NSNotification *_Nonnull note) {
                __strong typeof(weakSelf) self = weakSelf;
                if (!self) {
                  return;
                }
                [self kb_reloadUIForLocalizationChange];
              }];
  [self kb_applyTheme];
  [self kb_registerDarwinSkinInstallObserver];
  [self kb_consumePendingShopSkin];
  [self kb_applyDefaultSkinIfNeeded];

  [self kb_startObservingAppGroupChanges];

  // 监听 App Group 配置变化，动态切换键盘布局
  [self kb_checkAndApplyLayoutIfNeeded];
}

- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // 扩展进程内存上限较小：在系统发出内存警告时主动清理可重建的缓存，降低被系统杀死概率。
  self.kb_cachedGradientImage = nil;
  [self.kb_defaultGradientLayer removeFromSuperlayer];
  self.kb_defaultGradientLayer = nil;
  [[KBSkinManager shared] clearRuntimeImageCaches];
  [[SDImageCache sharedImageCache] clearMemory];
}

- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];
  // FIX: iOS 26 键盘闪烁问题 —— 恢复键盘正确高度
  // setupUI 中高度初始为 0（防止系统预渲染快照闪烁），此处恢复为实际键盘高度。
  // 此时系统已准备好键盘滑入动画，恢复高度后键盘将正常从底部滑入。
  CGFloat portraitWidth = [self kb_portraitWidth];
  CGFloat keyboardHeight = [self kb_keyboardHeightForWidth:portraitWidth];
  if (self.kb_heightConstraint) {
    self.kb_heightConstraint.constant = keyboardHeight;
  }
  // 进入/重新进入输入界面时，清理上一次会话残留的撤销状态与缓存，避免显示“撤销删除”但实际上已不可撤销。
  [[KBBackspaceUndoManager shared] registerNonClearAction];
  [[KBInputBufferManager shared] resetWithText:@""];
  [[KBLocalizationManager shared] reloadFromSharedStorageIfNeeded];
  // 键盘再次出现时，恢复 HUD 容器与主题（viewDidDisappear 里可能已清理图片/缓存）。
  [KBHUD setContainerView:self.view];
  [self kb_ensureKeyBoardMainViewIfNeeded];
  [self kb_applyTheme];
#if DEBUG
  NSLog(@"[Keyboard] viewWillAppear self=%p mem=%@",
        self, KBFormatMB(KBPhysFootprintBytes()));
#endif
  // 注意：微信/QQ 等宿主的 documentContext 可能是“截断窗口”，这里只更新
  // liveText，不要把它当作全文 manualSnapshot。
  [[KBInputBufferManager shared]
      updateFromExternalContextBefore:self.textDocumentProxy
                                          .documentContextBeforeInput
                                after:self.textDocumentProxy
                                          .documentContextAfterInput];
}

- (void)viewWillDisappear:(BOOL)animated {
  [super viewWillDisappear:animated];
  [[KBBackspaceUndoManager shared] registerNonClearAction];
  [self kb_releaseMemoryWhenKeyboardHidden];
#if DEBUG
  NSLog(@"[Keyboard] viewWillDisappear self=%p mem=%@",
        self, KBFormatMB(KBPhysFootprintBytes()));
#endif
}

- (void)viewDidDisappear:(BOOL)animated {
  [super viewDidDisappear:animated];
  // 再兜底一次，防止某些宿主只触发 willDisappear 而未触发 didDisappear。
  [self kb_releaseMemoryWhenKeyboardHidden];
}

- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
  [super traitCollectionDidChange:previousTraitCollection];
  if (@available(iOS 13.0, *)) {
    if (previousTraitCollection.userInterfaceStyle !=
        self.traitCollection.userInterfaceStyle) {
      self.kb_cachedGradientImage = nil;
      [self kb_applyDefaultSkinIfNeeded];
    }
  }
}

- (void)textDidChange:(id<UITextInput>)textInput {
  [super textDidChange:textInput];
  [[KBInputBufferManager shared]
      updateFromExternalContextBefore:self.textDocumentProxy
                                          .documentContextBeforeInput
                                after:self.textDocumentProxy
                                          .documentContextAfterInput];
}

- (void)viewDidAppear:(BOOL)animated {
  [super viewDidAppear:animated];
  //    if (!_kb_didTriggerLoginDeepLinkOnce) {
  //        _kb_didTriggerLoginDeepLinkOnce = YES;
  //        // 仅在未登录时尝试拉起主App登录
  //        if (!KBAuthManager.shared.isLoggedIn) {
  //            [self kb_tryOpenContainerForLoginIfNeeded];
  //        }
  //    }
}

- (void)viewDidLayoutSubviews {
  [super viewDidLayoutSubviews];
  //  [self kb_updateKeyboardLayoutIfNeeded];

  // 首次布局完成后显示，避免闪烁
  if (self.contentView.hidden) {
    self.contentView.hidden = NO;
  }
  if (self.kb_defaultGradientLayer) {
    self.kb_defaultGradientLayer.frame = self.bgImageView.bounds;
  }

  // 每次布局时检查是否需要切换键盘布局
  [self kb_checkAndApplyLayoutIfNeeded];
}

- (void)viewWillTransitionToSize:(CGSize)size
       withTransitionCoordinator:
           (id<UIViewControllerTransitionCoordinator>)coordinator {
  [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
  __weak typeof(self) weakSelf = self;
  [coordinator
      animateAlongsideTransition:^(
          id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
        [weakSelf kb_updateKeyboardLayoutIfNeeded];
      }
      completion:^(
          __unused id<
              UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
        [weakSelf kb_updateKeyboardLayoutIfNeeded];
      }];
}

- (void)dealloc {
  if (self.kb_fullAccessObserverToken) {
    [[NSNotificationCenter defaultCenter]
        removeObserver:self.kb_fullAccessObserverToken];
    self.kb_fullAccessObserverToken = nil;
  }
  if (self.kb_skinObserverToken) {
    [[NSNotificationCenter defaultCenter]
        removeObserver:self.kb_skinObserverToken];
    self.kb_skinObserverToken = nil;
  }
  if (self.kb_localizationObserverToken) {
    [[NSNotificationCenter defaultCenter]
        removeObserver:self.kb_localizationObserverToken];
    self.kb_localizationObserverToken = nil;
  }
  [self kb_stopObservingAppGroupChanges];
  [self kb_unregisterDarwinSkinInstallObserver];
#if DEBUG
  if (_kb_debugDidCountAlive) {
    sKBKeyboardVCAliveCount -= 1;
  }
  NSLog(@"[Keyboard] KeyboardViewController dealloc alive=%ld self=%p mem=%@",
        (long)sKBKeyboardVCAliveCount, self, KBFormatMB(KBPhysFootprintBytes()));
#endif
}

#pragma mark - Localization

- (void)kb_reloadUIForLocalizationChange {
  if (![NSThread isMainThread]) {
    __weak typeof(self) weakSelf = self;
    dispatch_async(dispatch_get_main_queue(), ^{
      [weakSelf kb_reloadUIForLocalizationChange];
    });
    return;
  }

  // 记录当前面板状态，重建后尽量恢复。
  KBKeyboardPanelMode targetMode = self.kb_panelMode;
  // 强制下次布局刷新：即使 profileId 未变，也需要让新建的主视图应用一次当前 profile。
  _kb_lastLoadedProfileId = nil;

  // 主键盘/面板里有大量静态文案（init 时设置），语言变化后需要重建才能刷新。
  if (_keyBoardMainView) {
    [_keyBoardMainView removeFromSuperview];
    _keyBoardMainView = nil;
  }
  self.keyBoardMainHeightConstraint = nil;

  if (_functionView) {
    [_functionView removeFromSuperview];
    _functionView = nil;
  }
  if (_settingView) {
    [_settingView removeFromSuperview];
    _settingView = nil;
  }
  if (_subscriptionView) {
    [_subscriptionView removeFromSuperview];
    _subscriptionView = nil;
  }
  if (_chatPanelView) {
    [_chatPanelView removeFromSuperview];
    _chatPanelView = nil;
  }
  self.chatPanelVisible = NO;
  self.chatPanelHeightConstraint = nil;

  // 强制触发面板刷新：先回到 Main，再切回目标面板（避免 kb_setPanelMode 直接 return）。
  self.kb_panelMode = KBKeyboardPanelModeMain;
  [self kb_setPanelMode:targetMode animated:NO];
  // 语言变化后，键盘布局/profile 也可能需要同步更新（未手动选择键盘配置时会随 App 语言变化）
  [self kb_checkAndApplyLayoutIfNeeded];
  [KBHUD setContainerView:self.view];
  [self kb_applyTheme];
}

#pragma mark - Layout Switching

- (void)kb_checkAndApplyLayoutIfNeeded {
  NSString *currentProfileId = [[KBKeyboardLayoutResolver sharedResolver] currentProfileId];
  if (currentProfileId.length == 0) {
    currentProfileId = @"en_US_qwerty";
  }

  if ([currentProfileId isEqualToString:_kb_lastLoadedProfileId]) {
    return;
  }

  NSLog(@"[KeyboardViewController] Detected profileId change: %@ -> %@", _kb_lastLoadedProfileId, currentProfileId);
  _kb_lastLoadedProfileId = currentProfileId;

  if (self.keyBoardMainView && [self.keyBoardMainView respondsToSelector:@selector(reloadLayoutWithProfileId:)]) {
    [self.keyBoardMainView performSelector:@selector(reloadLayoutWithProfileId:) withObject:currentProfileId];
  }

  NSString *suggestionEngine = [[KBKeyboardLayoutResolver sharedResolver] suggestionEngineForProfileId:currentProfileId];
  if (suggestionEngine.length > 0) {
    [self kb_updateSuggestionEngineType:suggestionEngine];
  }

  NSString *languageCode = [[KBKeyboardLayoutResolver sharedResolver] currentLanguageCode];
  if (languageCode.length > 0) {
    NSLog(@"[KeyboardViewController] Reloading skin icon map for language: %@", languageCode);
    [KBSkinInstallBridge reloadCurrentSkinIconMapForLanguageCode:languageCode];
  }
}

- (void)kb_updateSuggestionEngineType:(NSString *)engineType {
  NSLog(@"[KeyboardViewController] Switching suggestion engine to: %@", engineType);
  [[KBSuggestionEngine shared] setEngineTypeFromString:engineType];
}

#pragma mark - App Group KVO

- (void)kb_startObservingAppGroupChanges {
  NSUserDefaults *appGroup = [[NSUserDefaults alloc] initWithSuiteName:AppGroup];
  
  __weak typeof(self) weakSelf = self;
  self.kb_appGroupObserverToken = [[NSNotificationCenter defaultCenter]
      addObserverForName:NSUserDefaultsDidChangeNotification
                  object:appGroup
                   queue:[NSOperationQueue mainQueue]
              usingBlock:^(__unused NSNotification *_Nonnull note) {
                __strong typeof(weakSelf) strongSelf = weakSelf;
                if (!strongSelf) { return; }
                [strongSelf kb_checkAndApplyLayoutIfNeeded];
              }];
  
  NSLog(@"[KeyboardViewController] Started observing App Group changes");
}

- (void)kb_stopObservingAppGroupChanges {
  if (self.kb_appGroupObserverToken) {
    [[NSNotificationCenter defaultCenter] removeObserver:self.kb_appGroupObserverToken];
    self.kb_appGroupObserverToken = nil;
  }
}

@end