#pragma once

#include <XCEngine/Core/Asset/IResource.h>
#include <XCEngine/Core/Asset/ResourceTypes.h>
#include <XCEngine/Core/Asset/ImportSettings.h>
#include <XCEngine/Core/Containers/String.h>
#include <XCEngine/Core/Containers/Array.h>
#include <functional>

namespace XCEngine {
namespace Resources {

struct LoadResult {
    IResource* resource = nullptr;
    bool success = false;
    Containers::String errorMessage;
    
    LoadResult() = default;
    explicit LoadResult(IResource* res) : resource(res), success(res != nullptr) {}
    explicit LoadResult(const Containers::String& error) : success(false), errorMessage(error) {}
    explicit LoadResult(bool inSuccess, const Containers::String& error = "") 
        : success(inSuccess), errorMessage(error) {}
    
    operator bool() const { return success && resource != nullptr; }
};

class IResourceLoader {
public:
    virtual ~IResourceLoader() = default;
    
    virtual ResourceType GetResourceType() const = 0;
    virtual Containers::Array<Containers::String> GetSupportedExtensions() const = 0;
    virtual bool CanLoad(const Containers::String& path) const = 0;
    virtual LoadResult Load(const Containers::String& path, const ImportSettings* settings = nullptr) = 0;
    
    virtual void LoadAsync(const Containers::String& path, 
                          const ImportSettings* settings,
                          std::function<void(LoadResult)> callback) {
        LoadResult result = Load(path, settings);
        if (callback) {
            callback(result);
        }
    }
    
    virtual ImportSettings* GetDefaultSettings() const = 0;

protected:
    static Containers::Array<Core::uint8> ReadFileData(const Containers::String& path);
    static Containers::String GetExtension(const Containers::String& path);
};

#define REGISTER_RESOURCE_LOADER(loaderType) \
    namespace { \
        struct loaderType##Registrar { \
            loaderType##Registrar() { \
                ResourceManager::Get().RegisterLoader(new loaderType()); \
            } \
        } g_##loaderType##Registrar; \
    }

} // namespace Resources
} // namespace XCEngine