SCSocialTextView.m

//
//  SCSocialTextView.m
//  Socialcast
//
//  Created by Mike Silvis on 12/10/14.
//  Copyright (c) 2014 Socialcast. All rights reserved.
//

#import "SCSocialTextView.h"
#import "SCColorScheme.h"
#import "SCUser.h"
#import "SCGroup.h"
#import "SCHashtag.h"
#import "SCUIPartEventTable.h"
#import "SCHyperLink.h"

@interface SCSocialTextView ()

@property (nonatomic, strong) NSMutableArray *rangesOfHotWords;

@end

@implementation SCSocialTextView

-(void)setMessage:(SCStreamMessage *)message {
  _message = message;

  self.recipients = message.recipients;
  self.mentions = message.mentions;
  self.hashtags = message.hashtags;
}

-(void)setText:(NSString *)text {
  self.rangesOfHotWords = [NSMutableArray array];

  text = [self updatedTextForMentionName:text objects:self.recipients];
  text = [self updatedTextForMentionName:text objects:self.mentions];

  [super setText:text];
  self.attributedText = [self socialAttributedText];
}

-(NSString *)updatedTextForMentionName:(NSString *)text objects:(NSArray *)objects {
  for (SCMentionable *object in objects) {
    if (object.mentionName && object.username) {
      text = [text stringByReplacingOccurrencesOfString:object.mentionName
                                             withString:object.username
                                                options:NSCaseInsensitiveSearch
                                                  range:NSMakeRange(0, text.length)];
    }
  }

  return text;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
  NSUInteger charIndex = [self charIndexAtLocation:[[touches anyObject] locationInView:self]];

  for (id obj in self.rangesOfHotWords) {
    NSRange range = [obj[@"range"] rangeValue];
    if (charIndex >= range.location && charIndex < (range.location + range.length)) {
      if (self.socialDelegate && [self.socialDelegate respondsToSelector:@selector(scSocialTextView:linkDidTouch:)]) {
        [self.socialDelegate scSocialTextView:self linkDidTouch:obj[@"link"]];
      }
      return;
    }
  }

  if (self.socialDelegate && [self.socialDelegate respondsToSelector:@selector(scSocialTextViewBackgroundDidTouch:)]) {
    [self.socialDelegate scSocialTextViewBackgroundDidTouch:self];
  }

  [super touchesEnded:touches withEvent:event];
}

-(NSUInteger)charIndexAtLocation:(CGPoint)touchLocation {
  NSUInteger glyphIndex = [self.layoutManager glyphIndexForPoint:touchLocation inTextContainer:self.textContainer];
  CGRect boundingRect = [self.layoutManager boundingRectForGlyphRange:NSMakeRange(glyphIndex, 1) inTextContainer:self.textContainer];

  if (CGRectContainsPoint(boundingRect, touchLocation)) {
    return [self.layoutManager characterIndexForGlyphAtIndex:glyphIndex];
  }
  else {
    return -1;
  }
}

-(NSMutableAttributedString *)socialAttributedText {
  NSMutableAttributedString *attrText = [[NSMutableAttributedString alloc] initWithString:self.text attributes:[SCColorScheme defaultScheme].defaultTextAttributes];

  // Users
  attrText = [self colorSocialElements:attrText objects:self.mentions keyword:@"@" color:[SCColorScheme defaultScheme].urlColor linkType:kSCHyperLinkMentionType];
  // Groups
  attrText = [self colorSocialElements:attrText objects:self.recipients keyword:@"@" color:[SCColorScheme defaultScheme].urlColor linkType:kSCHyperLinkMentionType];
  // Hashtags
  attrText = [self colorSocialElements:attrText objects:self.hashtags keyword:@"#" color:[SCColorScheme defaultScheme].hashtagColor linkType:kSCHyperLinkHashtagType];
  // Read more link
  attrText = [self colorReadMore:attrText];

  return attrText;
}

-(NSMutableAttributedString *)colorSocialElements:(NSMutableAttributedString *)attrString objects:(NSArray *)objects keyword:(NSString *)keyword color:(UIColor *)color linkType:(SCHyperLinkTypes)linkType {
  NSError *error;

  for (SCMentionable *object in objects) {
    NSString *stringToFind = [NSString stringWithFormat:@"%@%@", keyword, object.username];

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:stringToFind options:NSRegularExpressionCaseInsensitive error:&error];
    NSArray *matches = [regex matchesInString:self.text options:0 range:NSMakeRange(0, self.text.length)];

    for (NSTextCheckingResult *match in matches) {
      SCHyperLink *link = [[SCHyperLink alloc] init];
      link.type = linkType;
      link.text = object.username;

      [self.rangesOfHotWords addObject:@{
                                         @"range": [NSValue valueWithRange:match.range],
                                         @"link": link
                                        }
       ];
      [attrString addAttribute:NSForegroundColorAttributeName value:color range:match.range];
    }
  }

  return attrString;
}

-(NSMutableAttributedString *)colorReadMore:(NSMutableAttributedString *)attrString {
  NSError *error;

  NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"read more" options:NSRegularExpressionCaseInsensitive error:&error];
  NSArray *matches = [regex matchesInString:self.text options:0 range:NSMakeRange(0, self.text.length)];

  for (NSTextCheckingResult *match in matches) {
    [attrString addAttribute:NSForegroundColorAttributeName value:[SCColorScheme defaultScheme].urlColor range:match.range];
  }

  return attrString;
}

@end