//
//  AGEmojiPageView.m
//  AGEmojiKeyboard
//
//  Created by Ayush on 09/05/13.
//  Copyright (c) 2013 Ayush. All rights reserved.
//

#import "UMComEmojiPageView.h"

#define BACKSPACE_BUTTON_TAG 10
#define BUTTON_FONT_SIZE 32

@interface UMComEmojiPageView ()

@property (nonatomic) CGSize buttonSize;
@property (nonatomic) NSMutableArray *buttons;
@property (nonatomic) NSUInteger columns;
@property (nonatomic) NSUInteger rows;
@property (nonatomic) UIImage *backSpaceButtonImage;

@end

@implementation UMComEmojiPageView

- (void)setButtonTexts:(NSMutableArray *)buttonTexts {

  NSAssert(buttonTexts != nil, @"Array containing texts to be set on buttons is nil");

  if (([self.buttons count] - 1) == [buttonTexts count]) {
    // just reset text on each button
    for (NSUInteger i = 0; i < [buttonTexts count]; ++i) {
      [self.buttons[i] setTitle:buttonTexts[i] forState:UIControlStateNormal];
    }
  } else {
    [self.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
    self.buttons = nil;
    self.buttons = [NSMutableArray arrayWithCapacity:self.rows * self.columns];
    for (NSUInteger i = 0; i < [buttonTexts count]; ++i) {
        if (i % (self.rows *self.columns -1) == 0 && i > 0) {
            continue;
        }
      UIButton *button = [self createButtonAtIndex:i];
      [button setTitle:buttonTexts[i] forState:UIControlStateNormal];
      [self addToViewButton:button];
    }
    UIButton *button = [self createButtonAtIndex:self.rows * self.columns - 1];
      [button setContentEdgeInsets:UIEdgeInsetsMake(10, 10, 10, 10)];
    [button setImage:self.backSpaceButtonImage forState:UIControlStateNormal];
    button.tag = BACKSPACE_BUTTON_TAG;
    [self addToViewButton:button];
  }
}

- (void)addToViewButton:(UIButton *)button {

  NSAssert(button != nil, @"Button to be added is nil");

  [self.buttons addObject:button];
  [self addSubview:button];
}

// Padding is the expected space between two buttons.
// Thus, space of top button = padding / 2
// extra padding according to particular button's pos = pos * padding
// Margin includes, size of buttons in between = pos * buttonSize
// Thus, margin = padding / 2
//                + pos * padding
//                + pos * buttonSize

- (CGFloat)XMarginForButtonInColumn:(NSInteger)column {
  CGFloat padding = ((CGRectGetWidth(self.bounds) - self.columns * self.buttonSize.width) / self.columns);
  return (padding / 2 + column * (padding + self.buttonSize.width));
}

- (CGFloat)YMarginForButtonInRow:(NSInteger)rowNumber {
  CGFloat padding = ((CGRectGetHeight(self.bounds) - self.rows * self.buttonSize.height) / self.rows);
  return (padding / 2 + rowNumber * (padding + self.buttonSize.height));
}

- (UIButton *)createButtonAtIndex:(NSUInteger)index {
  UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
  button.titleLabel.font = [UIFont fontWithName:@"Apple color emoji" size:BUTTON_FONT_SIZE];
  NSInteger row = (NSInteger)(index / self.columns);
  NSInteger column = (NSInteger)(index % self.columns);
  button.frame = CGRectIntegral(CGRectMake([self XMarginForButtonInColumn:column],
                                           [self YMarginForButtonInRow:row],
                                           self.buttonSize.width,
                                           self.buttonSize.height));
        
  [button addTarget:self
             action:@selector(emojiButtonPressed:)
   forControlEvents:UIControlEventTouchUpInside];
  return button;
}

- (id)initWithFrame:(CGRect)frame
backSpaceButtonImage:(UIImage *)backSpaceButtonImage
         buttonSize:(CGSize)buttonSize
               rows:(NSUInteger)rows
            columns:(NSUInteger)columns {
  self = [super initWithFrame:frame];
  if (self) {
    _backSpaceButtonImage = backSpaceButtonImage;
    _buttonSize = buttonSize;
    _columns = columns;
    _rows = rows;
    _buttons = [[NSMutableArray alloc] initWithCapacity:rows * columns];
  }
  return self;
}

- (void)emojiButtonPressed:(UIButton *)button {
  if (button.tag == BACKSPACE_BUTTON_TAG) {
    [self.delegate emojiPageViewDidPressBackSpace:self];
    return;
  }
  [self.delegate emojiPageView:self didUseEmoji:button.titleLabel.text];
}

@end