#import <Cocoa/Cocoa.h>

@protocol FilePath <NSObject>
+ (instancetype)filePathForPathString:(NSString *)path;
@end

@protocol NamedVersion <NSObject>
- (NSString *)name;
@end

@protocol ToolsInfo <NSObject>

- (instancetype)initWithXcodeFilePath:(id<FilePath>)path error:(NSError **)error;

- (BOOL)isAppleInternal;
- (BOOL)isBeta;
- (NSUInteger)toolsBetaVersion;
- (id<NamedVersion>)toolsVersion;
- (id<NamedVersion>)toolsBuildVersion;

@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSURL *xcode;
        if (argc < 2) {
            // no path passed in
            xcode = [[NSURL fileURLWithPath:@"/var/db/xcode_select_link"] URLByResolvingSymlinksInPath];
        } else {
            NSURL *currentFolder = [NSURL fileURLWithPath:[[NSFileManager defaultManager] currentDirectoryPath]];
            xcode = [NSURL fileURLWithPath:@(argv[1]) relativeToURL:currentFolder];
        }
        while ([[xcode lastPathComponent] hasSuffix:@".app"] == NO) {
            xcode = [xcode URLByDeletingLastPathComponent];
        }

        NSURL *bundleURL = [NSURL fileURLWithPath:@"./Contents/SharedFrameworks/DVTFoundation.framework" relativeToURL:xcode];
        NSBundle *bundle = [NSBundle bundleWithURL:bundleURL];
        if (bundle == nil) { return -1; }

        if ([bundle load] == NO) { return -1; }

        id<FilePath> path = [NSClassFromString(@"DVTFilePath") filePathForPathString: [xcode absoluteURL].path];
        id<ToolsInfo> info = [[NSClassFromString(@"DVTToolsInfo") alloc] initWithXcodeFilePath:path error:nil];
        if (info == nil) { return -1; }
        if (info.toolsVersion.name == nil) { return -1; }
        if (info.toolsBuildVersion.name == nil) { return -1; }

        NSString *final = [NSString stringWithFormat:@"{ \"beta\": %lu, \"version\": \"%@\", \"build\": \"%@\" }",
                           (unsigned long)info.toolsBetaVersion,
                           info.toolsVersion.name,
                           info.toolsBuildVersion.name];
        printf("%s", final.UTF8String);
    }
    return 0;
}