package com.qxlva.nhs.service;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Properties;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Component
public class LastQueriedUpperDateStore
{

    private static final Logger LOGGER = LoggerFactory.getLogger(LastQueriedUpperDateStore.class);

    private static final String FILESTORE_NAME = "last_queried_upper_date.properties";

    private static final String PROPERTY_NAME = "last.queried.upper.date";

    private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");

    private Properties properties;

    private LocalDateTime lastQueriedUpperDate;

    @PostConstruct
    @SuppressWarnings("squid:S3457")
    public void initProperties()
    {

        properties = new Properties();

        try (InputStream input = LastQueriedUpperDateStore.class.getClassLoader().getResourceAsStream(FILESTORE_NAME))
        {

            if (input == null)
            {
                LOGGER.info("No last queried upper date store found");
                lastQueriedUpperDate = null;
                return;
            }

            properties.load(input);

            String lastQueriedUpperDateAsString = properties.getProperty(PROPERTY_NAME);

            lastQueriedUpperDate = LocalDateTime.parse(lastQueriedUpperDateAsString, FORMATTER);

        }
        catch (IOException e)
        {
            LOGGER.error("Error reading last queried upper date property from file", e);
        }

    }

    public LocalDateTime getLastQueriedUpperDate()
    {
        return lastQueriedUpperDate;
    }

    public void setLastQueriedUpperDate(LocalDateTime lastQueriedUpperDate)
    {
        this.lastQueriedUpperDate = lastQueriedUpperDate;
        saveToFile();
    }

    private void saveToFile()
    {

        if (lastQueriedUpperDate == null)
        {
            return;
        }

        try (OutputStream output = new FileOutputStream(FILESTORE_NAME))
        {

            String formattedDateTime = lastQueriedUpperDate.format(FORMATTER); // "1986-04-08 12:30"
            // set the properties value
            properties.setProperty(PROPERTY_NAME, formattedDateTime);

            // save properties to project root folder
            properties.store(output, "The last queried upper date time for the GUID Extractor tool");

        }
        catch (IOException e)
        {
            LOGGER.error("Failed to store last queried upper date property in file due to IO Exception", e);
        }

    }

}