album_art_provider.h

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#ifndef ALBUM_ART_PROVIDER_H
#define ALBUM_ART_PROVIDER_H
 
#include <algorithm>
#include <cctype>
#include <string>
#include <sstream>
#include <curlpp/Easy.hpp>
#include <curlpp/Options.hpp>
#include <curlpp/cURLpp.hpp>
 
#include <glibmm.h>
#include <giomm/memoryinputstream.h>
#include <gdkmm/pixbuf.h>

class AlbumArtProvider {
    public:

        struct InitializationFailed : public std::exception {
            const char* what() const throw() {
                return "Album art provider could not initialize. Please check your environment variables.";
            }
        };

        struct NotFoundException : public std::exception {
            const char* what() const throw() {
                return "Resource could not be found.";
            }
        };

        struct AlbumArt {
            Glib::RefPtr<Gdk::Pixbuf> art;
            std::string url;
        };

        static AlbumArtProvider* instance();

        static void destroy();

        virtual void init();

        virtual std::vector<AlbumArt> album_art(const std::string& artist, const std::string& title, const int width, const int height) = 0;

        AlbumArt album_art(const std::string& url, const int width, const int height);

        static std::string url_with_params(const std::string& url, const std::map<std::string, std::string>& params);

        static std::string url_encode(const std::string& input);
 
 
    private:
        static AlbumArtProvider* _instance; 
 
    protected:
        AlbumArtProvider() {};

        virtual ~AlbumArtProvider() {};
};
 
#endif // ALBUM_ART_PROVIDER_H