//
//  PDFSignatureManager.m
//  PDFReader
//
//  Copyright © 2014-2022 PDF Technologies, Inc. All Rights Reserved.
//
//  The PDF Reader Sample applications are licensed with a modified BSD license.
//  Please see License for details. This notice may not be removed from this file.
//

#import "PDFSignatureManager.h"

#define kPDFSignatureDataFileName (@"PDFKitResources/Signature/PDFSignatureData.plist")
#define kPDFSignatureImageFolder  (@"PDFKitResources/Signature/PDFSignatureImageFolder")

@implementation PDFSignatureManager

static PDFSignatureManager *_sharedSignManager;

+ (PDFSignatureManager *)sharedManager {
    if (!_sharedSignManager)
        _sharedSignManager = [[PDFSignatureManager alloc] init];
    return _sharedSignManager;
}

- (instancetype)init {
    if (self = [super init]) {
        NSString *library = [NSHomeDirectory() stringByAppendingPathComponent:@"Library"];
        NSString *filePath = [library stringByAppendingPathComponent:kPDFSignatureDataFileName];
        NSString *folderPath = [library stringByAppendingPathComponent:kPDFSignatureImageFolder];
        if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
            NSMutableArray *signatures = [NSMutableArray array];
            NSArray *fileNames = [[[NSArray alloc] initWithContentsOfFile:filePath] autorelease];
            for (NSString *fileName in fileNames) {
                [signatures addObject:[folderPath stringByAppendingPathComponent:fileName]];
            }
            _signatures = [signatures retain];
        } else {
            _signatures = [[NSArray alloc] init];
        }
    }
    return self;
}

- (void)dealloc {
    [_signatures release];
    [super dealloc];
}

- (NSString *)randomString {
    CFUUIDRef cfuuid = CFUUIDCreate(kCFAllocatorDefault);
    CFStringRef cfstring = CFUUIDCreateString(kCFAllocatorDefault, cfuuid);
    NSString *cfuuidString = [NSString stringWithString:(__bridge NSString *)cfstring];
    CFRelease(cfuuid);
    CFRelease(cfstring);
    return cfuuidString;
}

- (void)save {
    NSString *library = [NSHomeDirectory() stringByAppendingPathComponent:@"Library"];
    NSString *filePath = [library stringByAppendingPathComponent:kPDFSignatureDataFileName];
    if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
        [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
    }
    NSMutableArray *fileNames = [NSMutableArray array];
    for (NSString *filePath in self.signatures) {
        [fileNames addObject:filePath.lastPathComponent];
    }
    if (fileNames.count > 0) {
        [fileNames writeToFile:filePath atomically:YES];
    }
}

- (void)addSignature:(UIImage *)image {
    NSString *library = [NSHomeDirectory() stringByAppendingPathComponent:@"Library"];
    NSString *folderPath = [library stringByAppendingPathComponent:kPDFSignatureImageFolder];
    NSString *randomStr = [self randomString];
    if (image) {
        if (![[NSFileManager defaultManager] fileExistsAtPath:folderPath]) {
            [[NSFileManager defaultManager] createDirectoryAtPath:folderPath withIntermediateDirectories:YES attributes:nil error:nil];
        }
        NSString *imageName = [randomStr stringByAppendingPathExtension:@"png"];
        NSString *imagePath = [folderPath stringByAppendingPathComponent:imageName];
        if ([UIImagePNGRepresentation(image) writeToFile:imagePath atomically:YES]) {
            NSMutableArray *array = [NSMutableArray arrayWithArray:self.signatures];
            [array addObject:imagePath];
            self.signatures = array;
            [self save];
        }
    }
}

- (void)removeSignaturesAtIndexes:(NSIndexSet *)indexes {
    for (NSString *filePath in [self.signatures objectsAtIndexes:indexes]) {
        [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
    }
    NSMutableArray *array = [NSMutableArray arrayWithArray:self.signatures];
    [array removeObjectsAtIndexes:indexes];
    self.signatures = array;
    [self save];
}

@end