package eu.eudat.depositinterface.ckanrepository.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Service;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

@Service("ckanConfigLoader")
public class ConfigLoaderImpl implements ConfigLoader{
    private static final Logger logger = LoggerFactory.getLogger(ConfigLoaderImpl.class);
    private static final ObjectMapper mapper = new ObjectMapper();

    private CkanConfig ckanConfig;

    @Autowired
    private Environment environment;

    @Override
    public CkanConfig getCkanConfig() {
        if(ckanConfig == null){
            try{
                ckanConfig = mapper.readValue(getStreamFromPath(environment.getProperty("configuration.ckan")), CkanConfig.class);
            } catch (IOException e) {
                logger.error(e.getLocalizedMessage(), e);
            }
        }
        return ckanConfig;
    }

    @Override
    public byte[] getLogo() {
        String logo = environment.getProperty("configuration.logo");
        if(logo != null && !logo.isEmpty()){
            InputStream logoStream = getStreamFromPath(logo);
            try {
                return logoStream.readAllBytes();
            }
            catch (IOException e){
                logger.error(e.getMessage(), e);
                return null;
            }
        }
        return null;
    }

    private InputStream getStreamFromPath(String filePath) {
        try {
            return new FileInputStream(filePath);
        } catch (FileNotFoundException e) {
            logger.info("loading from classpath");
            return getClass().getClassLoader().getResourceAsStream(filePath);
        }
    }
}