package org.lucares.pdbui;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Map;
import java.util.Optional;

import org.lucares.pdbui.domain.FileDropConfig;
import org.lucares.pdbui.domain.FileDropSettings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

@Component
public class FileDropConfigProvider {
    private static final Logger LOGGER = LoggerFactory.getLogger(FileDropConfigProvider.class);

    private final FileDropConfig config;

    public FileDropConfigProvider(@Value("${path.fileDropConfig}") final String fileDropConfig)
            throws JsonParseException, JsonMappingException, IOException {
        final Path configPath = Path.of(fileDropConfig);

        if (Files.exists(configPath)) {

            final ObjectMapper objectMapper = new ObjectMapper();
            config = objectMapper.readValue(configPath.toFile(), FileDropConfig.class);
            LOGGER.info("File drop config: {}", objectMapper.writeValueAsString(config));
        } else {
            config = new FileDropConfig();
        }
    }

    public FileDropConfig getConfig() {
        return config;
    }

    public Optional<CsvReaderSettings> provideCsvReaderSettings(final String file) {
        for (final FileDropSettings settings : config.getSettings()) {
            final AntPathMatcher antPathMatcher = new AntPathMatcher();
            if (antPathMatcher.match(settings.match(), file)) {

                final Map<String, String> variables = antPathMatcher.extractUriTemplateVariables(settings.match(),
                        file);

                final CsvReaderSettings csvSettings = settings.csvSettings().copy();
                csvSettings.putAdditionalTag(variables);
                return Optional.of(csvSettings);
            }
        }
        return Optional.empty();
    }
}