//
//  NSMutableAttributedString+Extention.m
//  LYCoreLabelDemo
//
//  Created by LYoung on 15/9/24.
//  Copyright (c) 2015年 LYoung. All rights reserved.
//

#import "NSMutableAttributedString+Extention.h"
#import <CoreText/CoreText.h>

@implementation NSMutableAttributedString (Extention)


+ (NSMutableAttributedString *)stringWithText:(NSMutableString *)text
{
    NSMutableArray *msgArray = [NSMutableArray array];
    [self getFaceRange:text msgArray:msgArray];
    NSMutableAttributedString *attributedString = [self textAndImage:msgArray];
    return attributedString;
}

+ (void)getFaceRange:(NSMutableString *)msg msgArray:(NSMutableArray *)msgArray{
    if (msg.length == 0) return;
    //遍历msg里面的每一标识
    //1.查找表情区域

    NSRange beginRange = [msg rangeOfString:BEGIN_FLAG];
    NSRange endRange = [msg rangeOfString:END_FLAG];
    
//    NSLog(@"%@",NSStringFromRange(beginRange));
//    NSLog(@"%@",NSStringFromRange(endRange));
    //同时找到表情的开始和结束标签,才算是一个表情
    if (beginRange.length && endRange.length) {
        //2.截取表情之前的字符串
        NSString *strBeforeFace = [msg substringToIndex:beginRange.location];
        if (strBeforeFace.length) {
            [msgArray addObject:strBeforeFace];
        }
        
        if (endRange.location < beginRange.location) {
            NSString *strAfterFace = [msg substringFromIndex:beginRange.location];
            [self getFaceRange:strAfterFace msgArray:msgArray];
        }else {
            NSUInteger loc = beginRange.location;
            NSUInteger len = endRange.location + 1 - beginRange.location;
            NSRange faceRange = NSMakeRange(loc, len);
            NSString *strFace = [msg substringWithRange:faceRange];
            
            NSRange faceBeginFlag = [strFace rangeOfString:BEGIN_FLAG options:NSBackwardsSearch];
            NSRange faceEndFlag = [strFace rangeOfString:END_FLAG options:NSBackwardsSearch];
            
            if (faceBeginFlag.length && faceEndFlag.length) {
                NSString *str = [strFace substringToIndex:faceBeginFlag.location];
                if (str.length) {
                    [msgArray addObject:str];
                }
                NSUInteger faceLoc = faceBeginFlag.location;
                NSUInteger faceLen = faceEndFlag.location + 1 - faceBeginFlag.location;
                NSRange faceBackRange = NSMakeRange(faceLoc, faceLen);
                strFace = [strFace substringWithRange:faceBackRange];
            }
            
            [msgArray addObject:strFace];
            
            //4.截取表情之后字符串
            NSString *strAfterFace = [msg substringFromIndex:endRange.location + 1];
            //[msgArray addObject:strAfterFace];
            //递归
            [self getFaceRange:strAfterFace msgArray:msgArray];
        }
        //3.截取表情
    }else{
        [msgArray addObject:msg];
    }
}

+ (NSMutableAttributedString *)textAndImage:(NSArray *)msgArray{
    
    //    if(msgArray.count == 0) return;
    
    NSMutableAttributedString *attStrM = [[NSMutableAttributedString alloc] initWithString:@""];
    //遍历表示与文字
    
    for (NSString *item in msgArray) {
        NSRange beginRange = [item rangeOfString:BEGIN_FLAG];
        NSRange endRange = [item rangeOfString:END_FLAG];
        //同时找到表情的开始和结束标签,才算是一个表示
        if (beginRange.length && endRange.length){
            NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
            NSString *imageStr = [FaceDict objectForKey:item];
            UIImage *image = Image([NSString stringWithFormat:@"face/%@",imageStr]);
            if (image == nil) {
                NSAttributedString *attStr = [[NSAttributedString alloc] initWithString:item];
                [attStrM appendAttributedString:attStr];
            }else {
                attachment.image = image;
                attachment.bounds = CGRectMake(0, 0, 14, 14);
                
                NSAttributedString *attStr = [NSAttributedString attributedStringWithAttachment:attachment];
                
                [attStrM appendAttributedString:attStr];
            }
        }else{
            //文字部分
            NSAttributedString *attStr = [[NSAttributedString alloc] initWithString:item];
            [attStrM appendAttributedString:attStr];
        }
    }
    return attStrM;
}

@end