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package com.jslsolucoes.spring.converter;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.convert.converter.Converter;

public class LocalDateTimeConverter implements Converter {

    private static final Logger logger = LoggerFactory.getLogger(LocalDateTimeConverter.class);

    @Override
    public LocalDateTime convert(String value) {
	if (StringUtils.isEmpty(value))
	    return null;
	String valueForMatch = normalize(value);
	List patterns = Arrays.asList("yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM-dd HH",
		"dd/MM/yyyy HH:mm:ss", "dd/MM/yyyy HH:mm", "dd/MM/yyyy HH");
	for (String pattern : patterns) {
	    try {
		return LocalDateTime.parse(valueForMatch, DateTimeFormatter.ofPattern(pattern));
	    } catch (DateTimeParseException e) {
		logger.debug("pattern {} does not match with value {}", pattern, value);
	    }
	}
	throw new RuntimeException("Could not parse " + value + " to java.time.LocalDateTime");
    }

    private String normalize(String value) {
	if (!value.matches("^[0-9]{2,4}(-|\\/)[0-9]{2}(-|\\/)[0-9]{2,4} [0-9]{2}(:[0-9]{2})?(:[0-9]{2})?$")) {
	    return value.concat(" 00:00:00");
	}
	return value;
    }

}