//
//  RCTZXing.m
//  QRCode
//
//  Created by 张国忠 on 2018/5/5.
//  Copyright © 2018年 Facebook. All rights reserved.
//

#import "RCTZXing.h"
#import "ZXingObjC/ZXingObjC.h"

@implementation RCTZXing

+ (UIImage*)createCodeWithString:(NSString*)str size:(CGSize)size CodeFomart:(ZXBarcodeFormat)format
{
    ZXMultiFormatWriter *writer = [[ZXMultiFormatWriter alloc] init];
    ZXBitMatrix *result = [writer encode:str format:format width:size.width height:size.width error:nil];
    if (result) {
        ZXImage *image = [ZXImage imageWithMatrix:result];
        return [UIImage imageWithCGImage:image.cgimage];
    } else {
        return nil;
    }
}


+ (void)recognizeImage:(UIImage*)image block:(void(^)(ZXBarcodeFormat barcodeFormat,NSString *str))block;
{
    ZXCGImageLuminanceSource *source = [[ZXCGImageLuminanceSource alloc] initWithCGImage:image.CGImage];
    
    ZXHybridBinarizer *binarizer = [[ZXHybridBinarizer alloc] initWithSource: source];
    
    ZXBinaryBitmap *bitmap = [[ZXBinaryBitmap alloc] initWithBinarizer:binarizer];
    
    NSError *error;
    
    id<ZXReader> reader;
    
    if (NSClassFromString(@"ZXMultiFormatReader")) {
        reader = [NSClassFromString(@"ZXMultiFormatReader") performSelector:@selector(reader)];
    }
    
    ZXDecodeHints *_hints = [ZXDecodeHints hints];
    ZXResult *result = [reader decode:bitmap hints:_hints error:&error];
    
    if (result == nil) {
        
        block(kBarcodeFormatQRCode,nil);
        return;
    }
    
    block(result.barcodeFormat,result.text);
}
#pragma mark --生成条码

//下面引用自 https://github.com/yourtion/Demo_CustomQRCode
#pragma mark - InterpolatedUIImage
+ (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {
    CGRect extent = CGRectIntegral(image.extent);
    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
    // 创建bitmap;
    size_t width = CGRectGetWidth(extent) * scale;
    size_t height = CGRectGetHeight(extent) * scale;
    CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
    CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
    CGColorSpaceRelease(cs);
    CIContext *context = [CIContext contextWithOptions:nil];
    CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
    CGContextScaleCTM(bitmapRef, scale, scale);
    CGContextDrawImage(bitmapRef, extent, bitmapImage);
    // 保存bitmap到图片
    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
    CGContextRelease(bitmapRef);
    CGImageRelease(bitmapImage);
    UIImage *aImage = [UIImage imageWithCGImage:scaledImage];
    CGImageRelease(scaledImage);
    return aImage;
}

#pragma mark - QRCodeGenerator
+ (CIImage *)createQRForString:(NSString *)qrString {
    NSData *stringData = [qrString dataUsingEncoding:NSUTF8StringEncoding];
    // 创建filter
    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    // 设置内容和纠错级别
    [qrFilter setValue:stringData forKey:@"inputMessage"];
    [qrFilter setValue:@"H" forKey:@"inputCorrectionLevel"];
    // 返回CIImage
    return qrFilter.outputImage;
}


#pragma mark - 生成二维码，背景色及二维码颜色设置
+ (UIImage*)createQRWithString:(NSString*)text QRSize:(CGSize)size
{
    NSData *stringData = [text dataUsingEncoding: NSUTF8StringEncoding];
    
    //生成
    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    [qrFilter setValue:stringData forKey:@"inputMessage"];
    [qrFilter setValue:@"H" forKey:@"inputCorrectionLevel"];
    
    
    CIImage *qrImage = qrFilter.outputImage;
    
    //绘制
    CGImageRef cgImage = [[CIContext contextWithOptions:nil] createCGImage:qrImage fromRect:qrImage.extent];
    UIGraphicsBeginImageContext(size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetInterpolationQuality(context, kCGInterpolationNone);
    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);
    UIImage *codeImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    CGImageRelease(cgImage);
    
    return codeImage;
}

//引用自:http://www.jianshu.com/p/e8f7a257b612
+ (UIImage*)createQRWithString:(NSString*)text QRSize:(CGSize)size QRColor:(UIColor*)qrColor bkColor:(UIColor*)bkColor
{
    
    NSData *stringData = [text dataUsingEncoding: NSUTF8StringEncoding];
    
    //生成
    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    [qrFilter setValue:stringData forKey:@"inputMessage"];
    [qrFilter setValue:@"H" forKey:@"inputCorrectionLevel"];
    
    
    //上色
    CIFilter *colorFilter = [CIFilter filterWithName:@"CIFalseColor"
                                       keysAndValues:
                             @"inputImage",qrFilter.outputImage,
                             @"inputColor0",[CIColor colorWithCGColor:qrColor.CGColor],
                             @"inputColor1",[CIColor colorWithCGColor:bkColor.CGColor],
                             nil];
    
    CIImage *qrImage = colorFilter.outputImage;
    
    //绘制
    CGImageRef cgImage = [[CIContext contextWithOptions:nil] createCGImage:qrImage fromRect:qrImage.extent];
    UIGraphicsBeginImageContext(size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetInterpolationQuality(context, kCGInterpolationNone);
    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);
    UIImage *codeImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    CGImageRelease(cgImage);
    
    return codeImage;
}

+ (UIImage*)createBarCodeWithString:(NSString*)text QRSize:(CGSize)size
{
    NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:false];
    
    CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];
    
    [filter setValue:data forKey:@"inputMessage"];
    
    CIImage *barcodeImage = [filter outputImage];
    
    // 消除模糊
    
    CGFloat scaleX = size.width / barcodeImage.extent.size.width; // extent 返回图片的frame
    
    CGFloat scaleY = size.height / barcodeImage.extent.size.height;
    
    CIImage *transformedImage = [barcodeImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)];
    
    return [UIImage imageWithCIImage:transformedImage];
}

@end