//
//  WordUtils.m
//  UUTUtils
//
//  Created by zhuge on 2017/12/26.
//  Copyright © 2017年 zhuge. All rights reserved.
//

#import "WordUtils.h"

NSString *letters = @"abcdefghijklmnopqrstuvwxyz";

@interface WordUtils()

@property (strong) NSArray *arrKeywords;

@end

@implementation WordUtils

- (instancetype)init
{
    self = [super init];
    if (self) {
        [self reset];
        NSString *path = [[NSBundle mainBundle] pathForResource:@"CY_String_keywords" ofType:@"txt"];
        NSString *str = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
        self.arrKeywords = [str componentsSeparatedByString:@","];
    }
    return self;
}

- (void)reset {
    self.iCurrentIndex = 1;
    self.maUsedKeywords = [NSMutableArray arrayWithCapacity:0];
    [self.maUsedKeywords addObject:@"abstract"];
    [self.maUsedKeywords addObject:@"assert"];
    [self.maUsedKeywords addObject:@"boolean"];
    [self.maUsedKeywords addObject:@"break"];
    [self.maUsedKeywords addObject:@"byte"];
    [self.maUsedKeywords addObject:@"case"];
    [self.maUsedKeywords addObject:@"catch"];
    [self.maUsedKeywords addObject:@"char"];
    [self.maUsedKeywords addObject:@"class"];
    [self.maUsedKeywords addObject:@"const"];
    [self.maUsedKeywords addObject:@"continue"];
    [self.maUsedKeywords addObject:@"default"];
    [self.maUsedKeywords addObject:@"do"];
    [self.maUsedKeywords addObject:@"double"];
    [self.maUsedKeywords addObject:@"else"];
    [self.maUsedKeywords addObject:@"enum"];
    [self.maUsedKeywords addObject:@"extends"];
    [self.maUsedKeywords addObject:@"final"];
    [self.maUsedKeywords addObject:@"finally"];
    [self.maUsedKeywords addObject:@"float"];
    [self.maUsedKeywords addObject:@"for"];
    [self.maUsedKeywords addObject:@"goto"];
    [self.maUsedKeywords addObject:@"if"];
    [self.maUsedKeywords addObject:@"implements"];
    [self.maUsedKeywords addObject:@"import"];
    [self.maUsedKeywords addObject:@"instanceof"];
    [self.maUsedKeywords addObject:@"int"];
    [self.maUsedKeywords addObject:@"interface"];
    [self.maUsedKeywords addObject:@"long"];
    [self.maUsedKeywords addObject:@"native"];
    [self.maUsedKeywords addObject:@"new"];
    [self.maUsedKeywords addObject:@"package"];
    [self.maUsedKeywords addObject:@"private"];
    [self.maUsedKeywords addObject:@"protected"];
    [self.maUsedKeywords addObject:@"public"];
    [self.maUsedKeywords addObject:@"return"];
    [self.maUsedKeywords addObject:@"strictfp"];
    [self.maUsedKeywords addObject:@"short"];
    [self.maUsedKeywords addObject:@"static"];
    [self.maUsedKeywords addObject:@"super"];
    [self.maUsedKeywords addObject:@"switch"];
    [self.maUsedKeywords addObject:@"synchronized"];
    [self.maUsedKeywords addObject:@"this"];
    [self.maUsedKeywords addObject:@"throw"];
    [self.maUsedKeywords addObject:@"throws"];
    [self.maUsedKeywords addObject:@"transient"];
    [self.maUsedKeywords addObject:@"try"];
    [self.maUsedKeywords addObject:@"void"];
    [self.maUsedKeywords addObject:@"volatile"];
    [self.maUsedKeywords addObject:@"while"];
    [self.maUsedKeywords addObject:@"true"];
    [self.maUsedKeywords addObject:@"false"];
}

- (NSString *)nextStringFor26Hex {
    NSString *ret = @"";
    int n = _iCurrentIndex;
    while (n > 0) {
        int m = n % 26;
        if (m == 0) {
            m = 26;
        }
        n = (n - m) / 26;
        ret = [NSString stringWithFormat:@"%c%@", (char)(m + 'a' - 1), ret];
    }
    self.iCurrentIndex++;
    return ret;
}

- (NSString *)nextDistinctKeyword {
    int notFoundTimes = 0;
    NSString *str = _arrKeywords[arc4random() % [_arrKeywords count]];
    while ([_maUsedKeywords containsObject:str]) {
        //        NSLog(@"----------------------repeated");
        notFoundTimes++;
        if (notFoundTimes > 10) {
            str = [NSString stringWithFormat:@"%@_%@", _arrKeywords[arc4random() % [_arrKeywords count]], _arrKeywords[arc4random() % [_arrKeywords count]]];
        } else {
            str = _arrKeywords[arc4random() % [_arrKeywords count]];
        }
    }
    str = [str lowercaseString];
    [_maUsedKeywords addObject:str];
    return str;
}

#pragma mark static
+(NSString*) randomStringWithLength:(int) len {
    NSMutableString *randomString = [NSMutableString stringWithCapacity:len];
    for (int i = 0; i < len; i++) {
        [randomString appendFormat:@"%C", [letters characterAtIndex:arc4random() % [letters length]]];
    }
    return randomString;
}

+(NSString *)randomKeyword {
    NSString *path = [[NSBundle mainBundle] pathForResource:@"CY_String_keywords" ofType:@"txt"];
    NSString *str = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    NSArray *arr = [str componentsSeparatedByString:@","];
    NSString *keyword = [arr objectAtIndex:arc4random() % [arr count]];
    return keyword;
}

+ (NSString *)reverse:(NSString *)str {
    NSMutableString *reversedString = [NSMutableString stringWithCapacity:[str length]];
    
    [str enumerateSubstringsInRange:NSMakeRange(0,[str length])
                            options:(NSStringEnumerationReverse | NSStringEnumerationByComposedCharacterSequences)
                         usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
                             [reversedString appendString:substring];
                         }];
    return reversedString;
}
+ (NSString *)urlEncode:(NSString *)str {
//    NSString *encoded = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(
//                                                                                              NULL,
//                                                                                              (CFStringRef)str,
//                                                                                              NULL,
//                                                                                              (CFStringRef)@"!*'\"();:@&=+$,/?%#[]% ",
//                                                                                              kCFStringEncodingUTF8 ));
    
    NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"!*'\"();:@&=+$,/?%#[]% "];
    NSString *encoded = [str stringByAddingPercentEncodingWithAllowedCharacters:set];
    return encoded;
}

+ (NSString *)stringByTrimHTML:(NSString *)str {
    str = [str stringByReplacingOccurrencesOfString:@" <br>" withString:@"<br>"];
    str = [str stringByReplacingOccurrencesOfString:@"<br>" withString:@"\n"];
    NSRange r;
    NSString *s = [str copy];
    while ((r = [s rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound)
        s = [s stringByReplacingCharactersInRange:r withString:@""];
    return s;
}

+ (NSString *)trimSpaceOfString:(NSString *)str {
    return [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
}

+ (NSString *)removeAllSuffix:(NSString *)suffix ofString:(NSString *)string {
    NSString *ret = [NSString stringWithString:string];
    while ([ret hasSuffix:suffix]) {
        ret = [ret substringToIndex:[ret length] - [suffix length]];
    }
    return ret;
}

+ (NSString *)removeAllPrefix:(NSString *)prefix ofString:(NSString *)string {
    NSString *ret = [NSString stringWithString:string];
    while ([ret hasPrefix:prefix]) {
        ret = [ret substringFromIndex:[prefix length]];
    }
    return ret;
}

@end