#import "Foundation/Foundation.h"
#if ENABLE_IOS_ON_DEMAND_RESOURCES
    #import "Foundation/NSBundle.h"
#endif


typedef void (*OnDemandResourcesRequestCompleteHandler)(void* handlerData, const char* error);


#if ENABLE_IOS_ON_DEMAND_RESOURCES


struct OnDemandResourcesRequestData
{
    NSBundleResourceRequest* request;
};


extern "C" OnDemandResourcesRequestData* UnityOnDemandResourcesCreateRequest(NSSet * tags, OnDemandResourcesRequestCompleteHandler handler, void* handlerData)
{
    OnDemandResourcesRequestData* data = new OnDemandResourcesRequestData();
    data->request = [[NSBundleResourceRequest alloc] initWithTags: tags];
    [data->request beginAccessingResourcesWithCompletionHandler:^(NSError* error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            const char* errorMessage = error ? [[error localizedDescription] UTF8String] : NULL;
            handler(handlerData, errorMessage);
        });
    }];
    return data;
}


extern "C" void UnityOnDemandResourcesRelease(OnDemandResourcesRequestData* data)
{
    [data->request endAccessingResources];
    delete data;
}

extern "C" float UnityOnDemandResourcesGetProgress(OnDemandResourcesRequestData* data)
{
    return data->request.progress.fractionCompleted;
}

extern "C" float UnityOnDemandResourcesGetLoadingPriority(OnDemandResourcesRequestData* data)
{
    float priority = (float)data->request.loadingPriority;
    return priority;
}

extern "C" void UnityOnDemandResourcesSetLoadingPriority(OnDemandResourcesRequestData* data, float priority)
{
    if (priority < 0.0f)
        priority = 0.0f;

    if (priority > 1.0f)
        data->request.loadingPriority = NSBundleResourceRequestLoadingPriorityUrgent;
    else
        data->request.loadingPriority = (double)priority;
}

extern "C" NSString* UnityOnDemandResourcesGetResourcePath(OnDemandResourcesRequestData * data, const char* resource)
{
    NSString* path = [[data->request bundle] pathForResource: [NSString stringWithUTF8String: resource] ofType: nil];
    return path;
}


#else // ENABLE_IOS_ON_DEMAND_RESOURCES


struct OnDemandResourcesRequestData
{
};


extern "C" OnDemandResourcesRequestData* UnityOnDemandResourcesCreateRequest(NSSet * tags, OnDemandResourcesRequestCompleteHandler handler, void* handlerData)
{
    OnDemandResourcesRequestData* data = new OnDemandResourcesRequestData();
    if (handler)
        handler(handlerData, NULL);
    return data;
}


extern "C" void UnityOnDemandResourcesRelease(OnDemandResourcesRequestData* data)
{
    delete data;
}

extern "C" float UnityOnDemandResourcesGetProgress(OnDemandResourcesRequestData* data)
{
    return 1.0f;
}

extern "C" float UnityOnDemandResourcesGetLoadingPriority(OnDemandResourcesRequestData* data)
{
    return 0.5;
}

extern "C" void UnityOnDemandResourcesSetLoadingPriority(OnDemandResourcesRequestData* data, float priority)
{
}

extern "C" NSString* UnityOnDemandResourcesGetResourcePath(OnDemandResourcesRequestData * data, const char* resource)
{
    return [NSString stringWithUTF8String: resource];
}


#endif // ENABLE_IOS_ON_DEMAND_RESOURCES