/*
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership.  The ASF licenses this file
 to you under the Apache License, Version 2.0 (the
 "License"); you may not use this file except in compliance
 with the License.  You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing,
 software distributed under the License is distributed on an
 "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 */

#import "CDVKeyboard.h"
#import <Cordova/CDVAvailability.h>

#ifndef __CORDOVA_3_2_0
#warning "The keyboard plugin is only supported in Cordova 3.2 or greater, it may not work properly in an older version. If you do use this plugin in an older version, make sure the HideKeyboardFormAccessoryBar and KeyboardShrinksView preference values are false."
#endif

@interface CDVKeyboard () <UIScrollViewDelegate>

@property (nonatomic, readwrite, assign) BOOL keyboardIsVisible;

@end

@implementation CDVKeyboard

@dynamic hideFormAccessoryBar;

- (id)settingForKey:(NSString*)key
{
    return [self.commandDelegate.settings objectForKey:[key lowercaseString]];
}

- (void)pluginInitialize
{
    // SETTINGS ////////////////////////

    NSString* setting = nil;

    setting = @"HideKeyboardFormAccessoryBar";
    if ([self settingForKey:setting]) {
        self.hideFormAccessoryBar = [(NSNumber*)[self settingForKey:setting] boolValue];
    }

    setting = @"KeyboardShrinksView";
    if ([self settingForKey:setting]) {
        self.shrinkView = [(NSNumber*)[self settingForKey:setting] boolValue];
    }

    setting = @"DisableScrollingWhenKeyboardShrinksView";
    if ([self settingForKey:setting]) {
        self.disableScrollingInShrinkView = [(NSNumber*)[self settingForKey:setting] boolValue];
    }

    //////////////////////////

    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
    __weak CDVKeyboard* weakSelf = self;

    _keyboardShowObserver = [nc addObserverForName:UIKeyboardDidShowNotification
                                            object:nil
                                             queue:[NSOperationQueue mainQueue]
                                        usingBlock:^(NSNotification* notification) {
            [weakSelf.commandDelegate evalJs:@"Keyboard.fireOnShow();"];
        }];
    _keyboardHideObserver = [nc addObserverForName:UIKeyboardDidHideNotification
                                            object:nil
                                             queue:[NSOperationQueue mainQueue]
                                        usingBlock:^(NSNotification* notification) {
            [weakSelf.commandDelegate evalJs:@"Keyboard.fireOnHide();"];
        }];

    _keyboardWillShowObserver = [nc addObserverForName:UIKeyboardWillShowNotification
                                            object:nil
                                             queue:[NSOperationQueue mainQueue]
                                        usingBlock:^(NSNotification* notification) {
            [weakSelf.commandDelegate evalJs:@"Keyboard.fireOnShowing();"];
            weakSelf.keyboardIsVisible = YES;
        }];
    _keyboardWillHideObserver = [nc addObserverForName:UIKeyboardWillHideNotification
                                            object:nil
                                             queue:[NSOperationQueue mainQueue]
                                        usingBlock:^(NSNotification* notification) {
            [weakSelf.commandDelegate evalJs:@"Keyboard.fireOnHiding();"];
            weakSelf.keyboardIsVisible = NO;
        }];
    
    _shrinkViewKeyboardWillChangeFrameObserver = [nc addObserverForName:UIKeyboardWillChangeFrameNotification
                                                                 object:nil
                                                                  queue:[NSOperationQueue mainQueue]
                                                             usingBlock:^(NSNotification* notification) {
                                                                 [weakSelf performSelector:@selector(shrinkViewKeyboardWillChangeFrame:) withObject:notification afterDelay:0];
                                                             }];
    
    self.webView.scrollView.delegate = self;
    
    _accessoryBarHeight = 44;
}

// //////////////////////////////////////////////////

- (BOOL)hideFormAccessoryBar
{
    return _hideFormAccessoryBar;
}

- (void)setHideFormAccessoryBar:(BOOL)ahideFormAccessoryBar
{
    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
    __weak CDVKeyboard* weakSelf = self;

    if (ahideFormAccessoryBar == _hideFormAccessoryBar) {
        return;
    }

    if (ahideFormAccessoryBar) {
        [nc removeObserver:_hideFormAccessoryBarKeyboardShowObserver];
        _hideFormAccessoryBarKeyboardShowObserver = [nc addObserverForName:UIKeyboardWillShowNotification
                                                                    object:nil
                                                                     queue:[NSOperationQueue mainQueue]
                                                                usingBlock:^(NSNotification* notification) {
                // we can't hide it here because the accessory bar hasn't been created yet, so we delay on the queue
                [weakSelf performSelector:@selector(formAccessoryBarKeyboardWillShow:) withObject:notification afterDelay:0];
            }];

        [nc removeObserver:_hideFormAccessoryBarKeyboardHideObserver];
        _hideFormAccessoryBarKeyboardHideObserver = [nc addObserverForName:UIKeyboardWillHideNotification
                                                                    object:nil
                                                                     queue:[NSOperationQueue mainQueue]
                                                                usingBlock:^(NSNotification* notification) {
                [weakSelf formAccessoryBarKeyboardWillHide:notification];
            }];
    } else {
        [nc removeObserver:_hideFormAccessoryBarKeyboardShowObserver];
        [nc removeObserver:_hideFormAccessoryBarKeyboardHideObserver];

        // if a keyboard is already visible (and the accessorybar was hidden), hide observer will NOT be called, so we observe it once
        if (self.keyboardIsVisible && _hideFormAccessoryBar) {
            _hideFormAccessoryBarKeyboardHideObserver = [nc addObserverForName:UIKeyboardWillHideNotification
                                                                        object:nil
                                                                         queue:[NSOperationQueue mainQueue]
                                                                    usingBlock:^(NSNotification* notification) {
                    [weakSelf formAccessoryBarKeyboardWillHide:notification];
                    [[NSNotificationCenter defaultCenter] removeObserver:_hideFormAccessoryBarKeyboardHideObserver];
                }];
        }
    }

    _hideFormAccessoryBar = ahideFormAccessoryBar;
}

// //////////////////////////////////////////////////

- (NSArray*)getKeyboardViews:(UIView*)viewToSearch{
    NSArray *subViews;
    
    for (UIView *possibleFormView in viewToSearch.subviews) {
        if ([[possibleFormView description] hasPrefix: self.getKeyboardFirstLevelIdentifier]) {
            if(IsAtLeastiOSVersion(@"8.0")){
                for (UIView* subView in possibleFormView.subviews) {
                    return subView.subviews;
                }
            }else{
                return possibleFormView.subviews;
            }
        }
        
    }
    return subViews;
}

- (NSString*)getKeyboardFirstLevelIdentifier{
    if(!IsAtLeastiOSVersion(@"8.0")){
        return @"<UIPeripheralHostView";
    }else{
        return @"<UIInputSetContainerView";
    }
}


- (void)formAccessoryBarKeyboardWillShow:(NSNotification*)notif
{
    if (!_hideFormAccessoryBar) {
        return;
    }

    UIWindow *keyboardWindow = nil;
    for (UIWindow *windows in [[UIApplication sharedApplication] windows]) {
        if (![[windows class] isEqual:[UIWindow class]]) {
            keyboardWindow = windows;
            break;
        }
    }
    
    for (UIView* peripheralView in [self getKeyboardViews:keyboardWindow]) {
        
        // hides the backdrop (iOS 7)
        if ([[peripheralView description] hasPrefix:@"<UIKBInputBackdropView"]) {
            // check that this backdrop is for the accessory bar (at the top),
            // sparing the backdrop behind the main keyboard
            CGRect rect = peripheralView.frame;
            if (rect.origin.y == 0) {
                [[peripheralView layer] setOpacity:0.0];
            }
        }
        
        // hides the accessory bar
        if ([[peripheralView description] hasPrefix:@"<UIWebFormAccessory"]) {
            //remove the extra scroll space for the form accessory bar
            CGRect newFrame = self.webView.scrollView.frame;
            newFrame.size.height += peripheralView.frame.size.height;
            self.webView.scrollView.frame = newFrame;
            
            _accessoryBarHeight = peripheralView.frame.size.height;
            
            // remove the form accessory bar
            if(IsAtLeastiOSVersion(@"8.0")){
                [[peripheralView layer] setOpacity:0.0];
            }else{
                [peripheralView removeFromSuperview];
            }
            
        }
        // hides the thin grey line used to adorn the bar (iOS 6)
        if ([[peripheralView description] hasPrefix:@"<UIImageView"]) {
            [[peripheralView layer] setOpacity:0.0];
        }
    }
}

- (void)formAccessoryBarKeyboardWillHide:(NSNotification*)notif
{
    // restore the scrollview frame
    self.webView.scrollView.frame = CGRectMake(0, 0, self.webView.frame.size.width, self.webView.frame.size.height);
}

// //////////////////////////////////////////////////

- (void)shrinkViewKeyboardWillChangeFrame:(NSNotification*)notif
{
    // No-op on iOS7.0.  It already resizes webview by default, and this plugin is causing layout issues
    // with fixed position elements.  We possibly should attempt to implement shringview = false on iOS7.0.
    // iOS 7.1+ behave the same way as iOS 6
    if (NSFoundationVersionNumber == NSFoundationVersionNumber_iOS_7_0){
        return;
    }
    
    self.webView.scrollView.scrollEnabled = YES;
    
    CGRect screen = self.webView.frame.origin.y > 0 ?
    [self.viewController.view convertRect:[[UIScreen mainScreen] applicationFrame] fromView:nil]:
    [self.viewController.view convertRect:[[UIScreen mainScreen] bounds] fromView:nil];

    CGRect keyboard = [self.viewController.view convertRect: ((NSValue*)notif.userInfo[@"UIKeyboardFrameEndUserInfoKey"]).CGRectValue fromView: nil];
    CGRect keyboardIntersection = CGRectIntersection(screen, keyboard);

    if(CGRectContainsRect(screen, keyboardIntersection) && !CGRectIsEmpty(keyboardIntersection) && _shrinkView && self.keyboardIsVisible){
        screen.size.height -= MIN(keyboardIntersection.size.height, keyboardIntersection.size.width);
        
        if (_hideFormAccessoryBar){
            screen.size.height += _accessoryBarHeight;
        }
        
        self.webView.scrollView.scrollEnabled = !self.disableScrollingInShrinkView;
    }
    
    self.webView.frame = screen;
}

// //////////////////////////////////////////////////

- (void)dealloc
{
    // since this is ARC, remove observers only

    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];

    [nc removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [nc removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

// //////////////////////////////////////////////////

#pragma mark Plugin interface

- (void) shrinkView:(CDVInvokedUrlCommand*)command
{
    id value = [command.arguments objectAtIndex:0];
    if (!([value isKindOfClass:[NSNumber class]])) {
        value = [NSNumber numberWithBool:NO];
    }
    
    self.shrinkView = [value boolValue];
}

- (void) disableScrollingInShrinkView:(CDVInvokedUrlCommand*)command
{
    id value = [command.arguments objectAtIndex:0];
    if (!([value isKindOfClass:[NSNumber class]])) {
        value = [NSNumber numberWithBool:NO];
    }
    
    self.disableScrollingInShrinkView = [value boolValue];
}

- (void) hideFormAccessoryBar:(CDVInvokedUrlCommand*)command
{
    id value = [command.arguments objectAtIndex:0];
    if (!([value isKindOfClass:[NSNumber class]])) {
        value = [NSNumber numberWithBool:NO];
    }
    
    self.hideFormAccessoryBar = [value boolValue];
}

#pragma mark UIScrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if(_shrinkView){
        scrollView.bounds = self.webView.bounds;
    }
}
@end