/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import "RCTAlertManager.h"

#import <FBReactNativeSpec/FBReactNativeSpec.h>
#import <RCTTypeSafety/RCTConvertHelpers.h>
#import <React/RCTAssert.h>
#import <React/RCTConvert.h>
#import <React/RCTLog.h>
#import <React/RCTUtils.h>

#import "CoreModulesPlugins.h"
#import "RCTAlertController.h"

@implementation RCTConvert (UIAlertViewStyle)

RCT_ENUM_CONVERTER(
    RCTAlertViewStyle,
    (@{
      @"default" : @(RCTAlertViewStyleDefault),
      @"secure-text" : @(RCTAlertViewStyleSecureTextInput),
      @"plain-text" : @(RCTAlertViewStylePlainTextInput),
      @"login-password" : @(RCTAlertViewStyleLoginAndPasswordInput),
    }),
    RCTAlertViewStyleDefault,
    integerValue)

@end

@interface RCTAlertManager () <NativeAlertManagerSpec>

@end

@implementation RCTAlertManager {
  NSHashTable *_alertControllers;
}

RCT_EXPORT_MODULE()

- (dispatch_queue_t)methodQueue
{
  return dispatch_get_main_queue();
}

- (void)invalidate
{
  RCTExecuteOnMainQueue(^{
#if !TARGET_OS_OSX // [macOS]
    for (UIAlertController *alertController in self->_alertControllers) {
      [alertController.presentingViewController dismissViewControllerAnimated:YES completion:nil];
    }
#else // [macOS
  for (NSAlert *alert in self->_alertControllers) {
    if (alert.window.sheetParent) {
      [alert.window.sheetParent endSheet:alert.window];
    } else {
      [alert.window close];
    }
  }
#endif // macOS]
  });
}

/**
 * @param {NSDictionary} args Dictionary of the form
 *
 *   @{
 *     @"message": @"<Alert message>",
 *     @"buttons": @[
 *       @{@"<key1>": @"<title1>"},
 *       @{@"<key2>": @"<title2>"},
 *     ],
 *     @"cancelButtonKey": @"<key2>",
 *   }
 * The key from the `buttons` dictionary is passed back in the callback on click.
 * Buttons are displayed in the order they are specified.
 */
RCT_EXPORT_METHOD(alertWithArgs : (JS::NativeAlertManager::Args &)args callback : (RCTResponseSenderBlock)callback)
{
  NSString *title = [RCTConvert NSString:args.title()];
  NSString *message = [RCTConvert NSString:args.message()];
  RCTAlertViewStyle type = [RCTConvert RCTAlertViewStyle:args.type()];
  NSArray<NSDictionary *> *buttons =
      [RCTConvert NSDictionaryArray:RCTConvertOptionalVecToArray(args.buttons(), ^id(id<NSObject> element) {
                    return element;
                  })];
#if !TARGET_OS_OSX // [macOS]
  NSString *defaultValue = [RCTConvert NSString:args.defaultValue()];
  NSString *cancelButtonKey = [RCTConvert NSString:args.cancelButtonKey()];
  NSString *destructiveButtonKey = [RCTConvert NSString:args.destructiveButtonKey()];
  NSString *preferredButtonKey = [RCTConvert NSString:args.preferredButtonKey()];
  UIKeyboardType keyboardType = [RCTConvert UIKeyboardType:args.keyboardType()];
  UIUserInterfaceStyle userInterfaceStyle = [RCTConvert UIUserInterfaceStyle:args.userInterfaceStyle()];
#else // [macOS
  BOOL critical = args.critical().value_or(NO);
  BOOL modal = args.modal().value_or(NO);
  NSArray<NSDictionary *> *defaultInputs = [RCTConvert NSDictionaryArray:RCTConvertOptionalVecToArray(args.defaultInputs(), ^id(id<NSObject> element) { return element; })];
#endif // macOS]

  if (!title && !message) {
    RCTLogError(@"Must specify either an alert title, or message, or both");
    return;
  }
#if !TARGET_OS_OSX // [macOS]
  if (buttons.count == 0) {
    if (type == RCTAlertViewStyleDefault) {
      buttons = @[ @{@"0" : RCTUIKitLocalizedString(@"OK")} ];
      cancelButtonKey = @"0";
    } else {
      buttons = @[
        @{@"0" : RCTUIKitLocalizedString(@"OK")},
        @{@"1" : RCTUIKitLocalizedString(@"Cancel")},
      ];
      cancelButtonKey = @"1";
    }
  }

  RCTExecuteOnMainQueue(^{
    RCTAlertController *alertController = [RCTAlertController alertControllerWithTitle:title
                                                                               message:nil
                                                                        preferredStyle:UIAlertControllerStyleAlert];

    alertController.overrideUserInterfaceStyle = userInterfaceStyle;

    switch (type) {
      case RCTAlertViewStylePlainTextInput: {
        [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
          textField.secureTextEntry = NO;
          textField.text = defaultValue;
          textField.keyboardType = keyboardType;
        }];
        break;
      }
      case RCTAlertViewStyleSecureTextInput: {
        [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
          textField.placeholder = RCTUIKitLocalizedString(@"Password");
          textField.secureTextEntry = YES;
          textField.text = defaultValue;
          textField.keyboardType = keyboardType;
        }];
        break;
      }
      case RCTAlertViewStyleLoginAndPasswordInput: {
        [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
          textField.placeholder = RCTUIKitLocalizedString(@"Login");
          textField.text = defaultValue;
          textField.keyboardType = keyboardType;
        }];
        [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
          textField.placeholder = RCTUIKitLocalizedString(@"Password");
          textField.secureTextEntry = YES;
        }];
        break;
      }
      case RCTAlertViewStyleDefault:
        break;
    }

    alertController.message = message;

    for (NSDictionary<NSString *, id> *button in buttons) {
      if (button.count != 1) {
        RCTLogError(@"Button definitions should have exactly one key.");
      }
      NSString *buttonKey = button.allKeys.firstObject;
      NSString *buttonTitle = [RCTConvert NSString:button[buttonKey]];
      UIAlertActionStyle buttonStyle = UIAlertActionStyleDefault;
      if ([buttonKey isEqualToString:cancelButtonKey]) {
        buttonStyle = UIAlertActionStyleCancel;
      } else if ([buttonKey isEqualToString:destructiveButtonKey]) {
        buttonStyle = UIAlertActionStyleDestructive;
      }
      __weak RCTAlertController *weakAlertController = alertController;

      UIAlertAction *alertAction =
          [UIAlertAction actionWithTitle:buttonTitle
                                   style:buttonStyle
                                 handler:^(__unused UIAlertAction *action) {
                                   switch (type) {
                                     case RCTAlertViewStylePlainTextInput:
                                     case RCTAlertViewStyleSecureTextInput:
                                       callback(@[ buttonKey, [weakAlertController.textFields.firstObject text] ]);
                                       [weakAlertController hide];
                                       break;
                                     case RCTAlertViewStyleLoginAndPasswordInput: {
                                       NSDictionary<NSString *, NSString *> *loginCredentials = @{
                                         @"login" : [weakAlertController.textFields.firstObject text],
                                         @"password" : [weakAlertController.textFields.lastObject text]
                                       };
                                       callback(@[ buttonKey, loginCredentials ]);
                                       [weakAlertController hide];
                                       break;
                                     }
                                     case RCTAlertViewStyleDefault:
                                       callback(@[ buttonKey ]);
                                       [weakAlertController hide];
                                       break;
                                   }
                                 }];
      [alertController addAction:alertAction];

      if ([buttonKey isEqualToString:preferredButtonKey]) {
        [alertController setPreferredAction:alertAction];
      }
    }

    if (!self->_alertControllers) {
      self->_alertControllers = [NSHashTable weakObjectsHashTable];
    }
    [self->_alertControllers addObject:alertController];
    [alertController show:YES completion:nil];
  });
#else // [macOS
  
  NSAlert *alert = [NSAlert new];
  if (title.length > 0) {
    alert.messageText = title;
  }
  if (message.length > 0) {
    alert.informativeText = message;
  }
  
  if (critical) {
    alert.alertStyle = NSAlertStyleCritical;
  }
  
  NSView *accessoryView = nil;
	
	const NSRect RCTSingleTextFieldFrame = NSMakeRect(0.0, 0.0, 200.0, 22.0);
	const NSRect RCTUsernamePasswordFrame = NSMakeRect(0.0, 0.0, 200.0, 50.0);
	
	id (^textFieldDefaults)(NSTextField *, BOOL) = ^id(NSTextField *textField, BOOL isPassword) {
		textField.cell.scrollable = YES;
		textField.cell.wraps = YES;
    textField.maximumNumberOfLines = 1;
		textField.stringValue = (isPassword ? defaultInputs.lastObject[@"default"] : defaultInputs.firstObject[@"default"]) ?: @"";
		textField.placeholderString = isPassword ? defaultInputs.lastObject[@"placeholder"] : defaultInputs.firstObject[@"placeholder"];
		return textField;
	};
	
  switch (type) {
    case RCTAlertViewStylePlainTextInput: {
      accessoryView = textFieldDefaults([[NSTextField alloc] initWithFrame:RCTSingleTextFieldFrame], NO);
      accessoryView.translatesAutoresizingMaskIntoConstraints = YES;
      break;
    }
    case RCTAlertViewStyleSecureTextInput: {
      accessoryView = textFieldDefaults([[NSSecureTextField alloc] initWithFrame:RCTSingleTextFieldFrame], NO);
      break;
    }
    case RCTAlertViewStyleLoginAndPasswordInput: {
      accessoryView = [[NSView alloc] initWithFrame:RCTUsernamePasswordFrame];
      
      NSSecureTextField *password = textFieldDefaults([[NSSecureTextField alloc] initWithFrame:RCTSingleTextFieldFrame], YES);
      NSTextField *input = textFieldDefaults([[NSTextField alloc] initWithFrame:NSMakeRect(CGRectGetMinX(password.frame), CGRectGetMaxY(password.frame), CGRectGetWidth(password.frame), CGRectGetHeight(password.frame))], NO);
			
      [accessoryView addSubview:input];
      [accessoryView addSubview:password];
			
      break;
    }
    case RCTAlertViewStyleDefault:
      break;
  }
  alert.accessoryView = accessoryView;
  
  for (NSDictionary<NSString *, id> *button in buttons) {
    if (button.count != 1) {
      RCTLogError(@"Button definitions should have exactly one key.");
    }
    NSString *buttonKey = button.allKeys.firstObject;
    NSString *buttonTitle = [RCTConvert NSString:button[buttonKey]];
    [alert addButtonWithTitle:buttonTitle];
  }
  
  void (^callbacksHandlers)(NSModalResponse response) = ^void(NSModalResponse response) {
    NSString *buttonKey = @"0";
    if (response >= NSAlertFirstButtonReturn) {
      buttonKey = buttons[response - NSAlertFirstButtonReturn].allKeys.firstObject;
    }
    NSArray<NSTextField*> *textfields = [accessoryView isKindOfClass:NSTextField.class] ? @[accessoryView] : accessoryView.subviews;
    if (textfields.count == 2) {
      NSDictionary<NSString *, NSString *> *loginCredentials = @{
                                                                 @"login": textfields.firstObject.stringValue,
                                                                 @"password": textfields.lastObject.stringValue
                                                                 };
      callback(@[buttonKey, loginCredentials]);
    } else if (textfields.count == 1) {
      callback(@[buttonKey, textfields.firstObject.stringValue]);
    } else {
      callback(@[buttonKey]);
    }
  };
  
  if (!_alertControllers) {
    _alertControllers = [NSHashTable weakObjectsHashTable];
  }
  [_alertControllers addObject:alert];
  
  if (modal) {
    callbacksHandlers([alert runModal]);
  } else {
    [alert beginSheetModalForWindow:[NSApp keyWindow] completionHandler:callbacksHandlers];
  }
#endif // macOS]
}

- (std::shared_ptr<facebook::react::TurboModule>)getTurboModule:
    (const facebook::react::ObjCTurboModule::InitParams &)params
{
  return std::make_shared<facebook::react::NativeAlertManagerSpecJSI>(params);
}

@end

Class RCTAlertManagerCls(void)
{
  return RCTAlertManager.class;
}