#import "Utils.h"
#import <objc/runtime.h>

id makeRCTSource(NSURL *url, NSData *data) {
    Class RCTSourceClass = NSClassFromString(@"RCTSource");
    if (!RCTSourceClass) return nil;

    id source = [RCTSourceClass new];

    // RCTSource has no public initializer (see RCTJavaScriptLoader.mm's private
    // RCTSourceCreate()), so its private ivars are poked directly instead.
    Ivar urlIvar = class_getInstanceVariable(RCTSourceClass, "_url");
    Ivar dataIvar = class_getInstanceVariable(RCTSourceClass, "_data");
    Ivar lengthIvar = class_getInstanceVariable(RCTSourceClass, "_length");
    Ivar filesChangedCountIvar = class_getInstanceVariable(RCTSourceClass, "_filesChangedCount");

    if (urlIvar) object_setIvar(source, urlIvar, url);
    if (dataIvar) object_setIvar(source, dataIvar, data);

    // _length and _filesChangedCount are scalars (NSUInteger / NSInteger), not objects,
    // so they need direct memory writes at the ivar's offset instead of object_setIvar.
    if (lengthIvar) {
        ptrdiff_t offset = ivar_getOffset(lengthIvar);
        *(NSUInteger *)((uint8_t *)(__bridge void *)source + offset) = data.length;
    }
    if (filesChangedCountIvar) {
        ptrdiff_t offset = ivar_getOffset(filesChangedCountIvar);
        // -2 == RCTSourceFilesChangedCountNotBuiltByBundler, matching sources not built by Metro.
        *(NSInteger *)((uint8_t *)(__bridge void *)source + offset) = -2;
    }

    return source;
}

NSURL *getPyoncordDirectory(void) {
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSURL *documentDirectoryURL = [[fileManager URLsForDirectory:NSDocumentDirectory 
                                                     inDomains:NSUserDomainMask] lastObject];
    
    NSURL *pyoncordFolderURL = [documentDirectoryURL URLByAppendingPathComponent:@"pyoncord"];
    
    if (![fileManager fileExistsAtPath:pyoncordFolderURL.path]) {
        [fileManager createDirectoryAtURL:pyoncordFolderURL
              withIntermediateDirectories:YES
                               attributes:nil
                                    error:nil];
    }
    
    return pyoncordFolderURL;
}

UIColor *hexToUIColor(NSString *hex) {
    if (![hex hasPrefix:@"#"]) {
        return nil;
    }
    
    NSString *hexColor = [hex substringFromIndex:1];
    if (hexColor.length == 6) {
        hexColor = [hexColor stringByAppendingString:@"ff"];
    }
    
    if (hexColor.length == 8) {
        unsigned int hexNumber;
        NSScanner *scanner = [NSScanner scannerWithString:hexColor];
        if ([scanner scanHexInt:&hexNumber]) {
            CGFloat r = ((hexNumber & 0xFF000000) >> 24) / 255.0;
            CGFloat g = ((hexNumber & 0x00FF0000) >> 16) / 255.0;
            CGFloat b = ((hexNumber & 0x0000FF00) >> 8) / 255.0;
            CGFloat a = (hexNumber & 0x000000FF) / 255.0;
            
            return [UIColor colorWithRed:r green:g blue:b alpha:a];
        }
    }
    
    return nil;
}

void showErrorAlert(NSString *title, NSString *message) {
    dispatch_async(dispatch_get_main_queue(), ^{
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:title
                                                                     message:message
                                                              preferredStyle:UIAlertControllerStyleAlert];
        
        UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"OK" 
                                                         style:UIAlertActionStyleDefault
                                                       handler:nil];
        
        [alert addAction:okAction];
        
        UIWindow *window = nil;
        NSArray *windows = [[UIApplication sharedApplication] windows];
        for (UIWindow *w in windows) {
            if (w.isKeyWindow) {
                window = w;
                break;
            }
        }
        
        [window.rootViewController presentViewController:alert animated:YES completion:nil];
    });
}