/*
 Copyright 2014 OpenMarket Ltd
 
 Licensed 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 "CustomImageView.h"
#import "MediaManager.h"
#import "AppDelegate.h"

@interface CustomImageView () {
    id imageLoader;
    UIActivityIndicatorView *loadingWheel;
    
    // validation buttons
    UIButton* leftButton;
    UIButton* rightButton;
    
    NSString* leftButtonTitle;
    NSString* rightButtonTitle;
    
    blockCustomImageView_onClick leftHandler;
    blockCustomImageView_onClick rightHandler;
    
    UIView* bottomBarView;
}
@end

@implementation CustomImageView

#define CUSTOM_IMAGE_VIEW_BUTTON_WIDTH 100

- (id)initWithFrame:(CGRect)frame {
    
    self = [super initWithFrame:frame];
    
    if (self) {
        leftButtonTitle = nil;
        leftHandler = nil;
        rightButtonTitle = nil;
        rightHandler = nil;
        
        self.backgroundColor = [UIColor blackColor];
        self.contentMode = UIViewContentModeScaleAspectFit;
        self.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleTopMargin;
    }
    
    return self;
}

- (void)dealloc {
    if (imageLoader) {
        [MediaManager cancel:imageLoader];
        imageLoader = nil;
    }
    if (loadingWheel) {
        [loadingWheel removeFromSuperview];
        loadingWheel = nil;
    }
    if (bottomBarView) {
        [bottomBarView removeFromSuperview];
        bottomBarView = nil;
    }
}

- (void)startActivityIndicator {
    // Add activity indicator if none
    if (loadingWheel == nil) {
        loadingWheel = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        [self addSubview:loadingWheel];
    }
    // Adjust position
    CGPoint center = CGPointMake(self.frame.size.width / 2, self.frame.size.height / 2);
    loadingWheel.center = center;
    // Adjust color
    if ([self.backgroundColor isEqual:[UIColor blackColor]]) {
        loadingWheel.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhite;
    } else {
        loadingWheel.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
    }
    // Start
    [loadingWheel startAnimating];
}

- (void)stopActivityIndicator {
    if (loadingWheel) {
        [loadingWheel stopAnimating];
    }
}

#pragma mark -

- (IBAction)onButtonToggle:(id)sender
{
    if (sender == leftButton) {
        dispatch_async(dispatch_get_main_queue(), ^{
            leftHandler(self, leftButtonTitle);
        });
    } else if (sender == rightButton) {
        dispatch_async(dispatch_get_main_queue(), ^{
            rightHandler(self, rightButtonTitle);
        });
    }
}

// add a generic button to the bottom view
// return the added UIButton
- (UIButton*) addbuttonWithTitle:(NSString*)title  {
    UIButton* button = [[UIButton alloc] init];
    [button setTitle:title forState:UIControlStateNormal];
    [button setTitle:title forState:UIControlStateHighlighted];

    // default background text color
    CGFloat textColorFactor = 146.0 / 255.0;
    UIColor* textColor = [UIColor colorWithRed:textColorFactor green:textColorFactor blue:textColorFactor alpha:1.0];
   
    [button setTitleColor:textColor forState:UIControlStateNormal];
    [button setTitleColor:textColor forState:UIControlStateHighlighted];

    // keep the bottomView background color
    button.backgroundColor = [UIColor clearColor];
    
    [button addTarget:self action:@selector(onButtonToggle:) forControlEvents:UIControlEventTouchUpInside];
    [bottomBarView addSubview:button];
    
    return button;
}

- (void)layoutSubviews {
    
    // call upper layer
    [super layoutSubviews];

    // check if the dedicated buttons are already added
    if (leftButtonTitle || rightButtonTitle) {
        
        if (!bottomBarView) {
            bottomBarView = [[UIView alloc] init];
            
            if (leftButtonTitle) {
                leftButton = [self addbuttonWithTitle:leftButtonTitle];
            }
            
            rightButton = [[UIButton alloc] init];
            
            if (rightButtonTitle) {
                rightButton = [self addbuttonWithTitle:rightButtonTitle];
            }

            // default tabbar background color
            CGFloat base = 248.0 / 255.0f;
            bottomBarView.backgroundColor = [UIColor colorWithRed:base green:base blue:base alpha:1.0];
            
            [[AppDelegate theDelegate].masterTabBarController.tabBar addSubview:bottomBarView];
        }

        // manage the item 
        CGRect tabBarFrame = [AppDelegate theDelegate].masterTabBarController.tabBar.frame;
        tabBarFrame.origin.y = 0;
        bottomBarView.frame = tabBarFrame;
        
        if (leftButton) {
            leftButton.frame = CGRectMake(0, 0, CUSTOM_IMAGE_VIEW_BUTTON_WIDTH, bottomBarView.frame.size.height);
        }
        
        if (rightButton) {
            rightButton.frame = CGRectMake(bottomBarView.frame.size.width - CUSTOM_IMAGE_VIEW_BUTTON_WIDTH, 0, CUSTOM_IMAGE_VIEW_BUTTON_WIDTH, bottomBarView.frame.size.height);
        }
    }
}

- (void)setHideActivityIndicator:(BOOL)hideActivityIndicator {
    _hideActivityIndicator = hideActivityIndicator;
    if (hideActivityIndicator) {
        [self stopActivityIndicator];
    } else if (imageLoader) {
        // Loading is in progress, start activity indicator
        [self startActivityIndicator];
    }
}

- (void)setImageURL:(NSString *)imageURL {
    // Cancel media loader in progress (if any)
    if (imageLoader) {
        [MediaManager cancel:imageLoader];
        imageLoader = nil;
    }
    
    _imageURL = imageURL;
    
    // Reset image view
    self.image = nil;
    if (_placeholder) {
        // Set picture placeholder
        self.image = [UIImage imageNamed:_placeholder];
    }
    // Consider provided url to update image view
    if (imageURL) {
        // Load picture
        if (!_hideActivityIndicator) {
            [self startActivityIndicator];
        }
        imageLoader = [MediaManager loadPicture:imageURL
                                        success:^(UIImage *image) {
                                            [self stopActivityIndicator];
                                            self.image = image;
                                        }
                                        failure:^(NSError *error) {
                                            [self stopActivityIndicator];
                                            NSLog(@"Failed to download image (%@): %@", imageURL, error);
                                        }];
    }
}

#pragma mark - buttons management

- (void)setLeftButtonTitle: aLeftButtonTitle handler:(blockCustomImageView_onClick)handler {
    leftButtonTitle = aLeftButtonTitle;
    leftHandler = handler;
}

- (void)setRightButtonTitle:aRightButtonTitle handler:(blockCustomImageView_onClick)handler {
    rightButtonTitle = aRightButtonTitle;
    rightHandler = handler;
}

- (void)dismissSelection {
    if (bottomBarView) {
        [bottomBarView removeFromSuperview];
        bottomBarView = nil;
    }
}

@end