//
//  PBEditTextController.m
//  IphoneBIMe
//
//  Created by zjf on 2018/8/14.
//  Copyright © 2018年 ProBIM. All rights reserved.
//

#import "PBEditTextController.h"
#import "IQKeyboardManager.h"
#define maxTextCount 150
@interface PBEditTextController ()<UITextViewDelegate, UIGestureRecognizerDelegate>
@property (nonatomic, weak) UITextView *textView;
@property (nonatomic, weak) UILabel *textLengthL;
@property (nonatomic, weak) UILabel *promptL;
@end

@implementation PBEditTextController
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [[IQKeyboardManager sharedManager] setEnable:NO];
}
- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [[IQKeyboardManager sharedManager] setEnable:YES];
}
- (void)viewDidLoad {
    [super viewDidLoad];
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.f) {
//        self.edgesForExtendedLayout = UIRectEdgeNone;
        self.navigationController.interactivePopGestureRecognizer.enabled = YES;
        self.navigationController.interactivePopGestureRecognizer.delegate = self;
    }
    [self setupNav];
    [self setupUI];
}
//- (void)viewWillAppear:(BOOL)animated {
//    [super viewWillAppear:YES];
//    //导航栏背景颜色
//    [self.navigationController.navigationBar setBarTintColor:PBColor(35, 36, 41)];
//    // 去掉导航条下边的线
//    self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
//    //返回按钮颜色
//    self.navigationController.navigationBar.tintColor = [UIColor redColor];
//    for (UIBarButtonItem *item in self.navigationItem.leftBarButtonItems) {
//        [item setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor blueColor]} forState:UIControlStateNormal];
//    }
//    for (UIBarButtonItem *item in self.navigationItem.rightBarButtonItems) {
//        [item setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor blueColor]} forState:UIControlStateNormal];
//    }
////    [item setTitleTextAttributes:@{NSForegroundColorAttributeName: IndicatedColor} forState:UIControlStateHighlighted];
////    [item setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor lightGrayColor]} forState:UIControlStateDisabled];
//
//    //标题颜色
//    [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor],NSFontAttributeName: [UIFont boldSystemFontOfSize:16]}];
//}
- (void)setupNav {
//    PBBackNavItem *backNav = [PBBackNavItem backNacItem];
//    backNav.title = @"取消";
//    [backNav addTarget:self action:@selector(backItemAction) forControlEvents:UIControlEventTouchUpInside];
//    UIBarButtonItem *backNavItem = [[UIBarButtonItem alloc] initWithCustomView:backNav];
    
    UIBarButtonItem *backNavItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"Doc_preview_back"] style:UIBarButtonItemStylePlain target:self action:@selector(backItemAction)];
    self.navigationItem.leftBarButtonItem = backNavItem;
    UIBarButtonItem *saveNavItem = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStylePlain target:self action:@selector(saveText)];
    self.navigationItem.rightBarButtonItem = saveNavItem;
}
- (void)backItemAction {
    [self.navigationController popViewControllerAnimated:YES];
}
- (void)saveText {
    if(self.CompleteEditTextBlock) {
        self.CompleteEditTextBlock(_textView.text);
    }
    [self.navigationController popViewControllerAnimated:YES];
}
- (void)setupUI {
    self.view.backgroundColor = [UIColor z_colorWithR:242 G:242 B:242];
    UIView *bgView = [[UIView alloc] init];
    bgView.backgroundColor = [UIColor whiteColor];
    bgView.layer.borderWidth = 1.f;
    bgView.layer.borderColor = [[UIColor z_colorWithR:219 G:219 B:219] CGColor];
    [self.view addSubview:bgView];
    [bgView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view).offset(10);
        make.left.equalTo(self.view).offset(16);
        make.right.equalTo(self.view).offset(-16);
        make.height.equalTo(@250);
    }];
    
    UITextView *textView = [[UITextView alloc] init];
    textView.textColor= TitleColor;
    textView.font = [UIFont systemFontOfSize:TitleFontSize];
    [textView becomeFirstResponder];
    textView.delegate = self;
    textView.text = _text;
    [bgView addSubview:textView];
    [textView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(bgView).offset(16);
        make.left.equalTo(bgView).offset(16);
        make.right.equalTo(bgView).offset(-16);
        make.bottom.equalTo(bgView).offset(-46);
    }];
    UILabel *promptL= [UILabel z_labelWithText:_prompt Color:IgnoreColor isBold:NO Font:TitleFontSize];
    [bgView addSubview:promptL];
    [promptL mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(textView).offset(8);
        make.left.equalTo(textView).offset(6);
    }];
    if (_text.length != 0) {
        promptL.hidden = YES;
    }
    
    UIButton *clearAllBtn = [UIButton z_bgImageButton:[UIImage imageNamed:@"Issue_editText_clearAll"]];
    [clearAllBtn addTarget:self action:@selector(clearAllAction) forControlEvents:UIControlEventTouchUpInside];
    [bgView addSubview:clearAllBtn];
    [clearAllBtn mas_makeConstraints:^(MASConstraintMaker *make) {
        make.bottom.equalTo(bgView).offset(-11);
        make.left.equalTo(bgView).offset(22);
        make.size.mas_equalTo(CGSizeMake(79, 16));
    }];
    UILabel *textLengthL = [UILabel z_labelWithText:[NSString stringWithFormat:@"%lu/%d",(unsigned long)_text.length,maxTextCount] Color:DescColor isBold:NO Font:DescFontSize];
    textLengthL.textAlignment = NSTextAlignmentRight;
    [bgView addSubview:textLengthL];
    [textLengthL mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(clearAllBtn);
        make.right.equalTo(bgView).offset(-16);
        make.height.equalTo(@20);
    }];
    
    self.textView = textView;
    self.promptL = promptL;
    self.textLengthL = textLengthL;
}
- (void)clearAllAction {
    _text = @"";
    _textView.text = _text;
    self.promptL.hidden = NO;
    _textLengthL.text = [NSString stringWithFormat:@"%lu/%d",(unsigned long)_text.length,maxTextCount];
}
- (void)setText:(NSString *)text {
    _text = text;
}
- (void)setTitleText:(NSString *)titleText {
    self.title = titleText;
}
- (void)setPrompt:(NSString *)prompt {
    _prompt = prompt;
}
#pragma mark - UITextViewDelete
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range
 replacementText:(NSString *)text {
    NSLog(@"%zd",textView.text.length);
    NSLog(@"===shouldChangeText");
    UITextRange *selectedRange = [textView markedTextRange];
    //获取高亮部分
    UITextPosition *pos = [textView positionFromPosition:selectedRange.start offset:0];
    //获取高亮部分内容
    //NSString * selectedtext = [textView textInRange:selectedRange];
    //如果有高亮且当前字数开始位置小于最大限制时允许输入
    if (selectedRange && pos) {
        NSInteger startOffset = [textView offsetFromPosition:textView.beginningOfDocument toPosition:selectedRange.start];
        NSInteger endOffset = [textView offsetFromPosition:textView.beginningOfDocument toPosition:selectedRange.end];
        NSRange offsetRange = NSMakeRange(startOffset, endOffset - startOffset);
        if (offsetRange.location < maxTextCount) {
            return YES;
        }
        else{
            return NO;
        }
    }
    NSString *comcatstr = [textView.text stringByReplacingCharactersInRange:range withString:text];
    NSInteger caninputlen = maxTextCount - comcatstr.length;
    if (caninputlen >= 0){
        return YES;
    }else{
        NSInteger len = text.length + caninputlen;
        //防止当text.length + caninputlen < 0时，使得rg.length为一个非法最大正数出错
        NSRange rg = {0,MAX(len,0)};
        if (rg.length > 0){
            NSString *s = @"";
            //判断是否只普通的字符或asc码(对于中文和表情返回NO)
            BOOL asc = [text canBeConvertedToEncoding:NSASCIIStringEncoding];
            if (asc) {
                s = [text substringWithRange:rg];//因为是ascii码直接取就可以了不会错
            }else{
                __block NSInteger idx = 0;
                __block NSString  *trimString = @"";//截取出的字串
                //使用字符串遍历，这个方法能准确知道每个emoji是占一个unicode还是两个
                [text enumerateSubstringsInRange:NSMakeRange(0, [text length])
                                         options:NSStringEnumerationByComposedCharacterSequences
                                      usingBlock: ^(NSString* substring, NSRange substringRange, NSRange enclosingRange, BOOL* stop) {
                                          if (idx >= rg.length) {
                                              *stop = YES; //取出所需要就break，提高效率
                                              return ;
                                          }
                                          trimString = [trimString stringByAppendingString:substring];
                                          idx++;
                                      }];
                s = trimString;
            }
            //rang是指从当前光标处进行替换处理(注意如果执行此句后面返回的是YES会触发didchange事件)
            [textView setText:[textView.text stringByReplacingCharactersInRange:range withString:s]];
            //既然是超出部分截取了，哪一定是最大限制了。
            self.textLengthL.text = [NSString stringWithFormat:@"%d/%ld",0,(long)maxTextCount];
        }
        return NO;
    }
}


- (void)textViewDidChange:(UITextView *)textView{
    if (textView.text.length == 0) {
        self.promptL.hidden = NO;
    }else {
        self.promptL.hidden = YES;
    }
    NSLog(@"===DidChangeText");
    UITextRange *selectedRange = [textView markedTextRange];
    //获取高亮部分
    UITextPosition *pos = [textView positionFromPosition:selectedRange.start offset:0];
    //如果在变化中是高亮部分在变，就不要计算字符了
    if (selectedRange && pos) {
        return;
    }
    NSString  *nsTextContent = textView.text;
    NSInteger existTextNum = nsTextContent.length;
    if (existTextNum > maxTextCount){
        //截取到最大位置的字符(由于超出截部分在should时被处理了所在这里这了提高效率不再判断)
        NSString *s = [nsTextContent substringToIndex:maxTextCount];
        [textView setText:s];
    }
    //不让显示负数 口口日
    self.textLengthL.text = [NSString stringWithFormat:@"%ld/%d",MAX(0,maxTextCount - existTextNum),maxTextCount];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end