package com.jsql.util;
   
   import com.jsql.model.exception.JSqlRuntimeException;
   import org.apache.commons.lang3.StringUtils;
   import org.apache.logging.log4j.LogManager;
   import org.apache.logging.log4j.Logger;
   import org.apache.logging.log4j.util.Strings;
   
   import java.io.IOException;
  import java.io.InputStream;
  import java.io.StringReader;
  import java.math.BigDecimal;
  import java.math.RoundingMode;
  import java.nio.charset.StandardCharsets;
  import java.util.Arrays;
  import java.util.Locale;
  import java.util.Properties;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  public class PropertiesUtil {
      
      private static final Logger LOGGER = LogManager.getRootLogger();
  
      private final Properties properties = new Properties();
  
      public PropertiesUtil() {
          var filename = "config.properties";
          try (InputStream input = PropertiesUtil.class.getClassLoader().getResourceAsStream(filename)) {
              if (input == null) {
                  LOGGER.log(LogLevelUtil.CONSOLE_ERROR, "Properties file {} not found", filename);
                  return;
              }
              this.properties.load(input);  // load a properties file from class path, inside static method
          } catch (IOException e) {
              LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
          }
      }
  
      public void displayI18nStatus(Locale newLocale) {
          if (!Arrays.asList(StringUtils.EMPTY, "en").contains(newLocale.getLanguage())) {
              AtomicInteger countGui = new AtomicInteger();
              var bundleRoot = PropertiesUtil.getProperties("/i18n/jsql.properties");
              // fall working as uppercase regional matches lowercase bundle (eg. es_AN)
              var bundleUser = PropertiesUtil.getProperties("/i18n/jsql_" + newLocale.getLanguage() + ".properties");
              bundleRoot.entrySet().stream().filter(
                  key -> bundleUser.isEmpty() || !bundleUser.containsKey(key.getKey())
              ).forEach(
                  key -> countGui.getAndIncrement()
              );
              if (countGui.get() > 0) {
                  LOGGER.log(
                      LogLevelUtil.CONSOLE_SUCCESS,
                      "Switched to {}{} with {}% translated, contribute and translate any of remaining {} items in menu Community",
                      () -> newLocale.getDisplayLanguage(newLocale),
                      () -> Strings.isBlank(newLocale.getCountry()) ? StringUtils.EMPTY : " ("+ newLocale.getCountry() +")",  // should be nameEnglish from Language
                      () -> BigDecimal.valueOf(
                          100.0 - countGui.get() * 100.0 / bundleRoot.size()
                      ).setScale(1, RoundingMode.HALF_UP).doubleValue(),
                      countGui::get
                  );
              }
          }
      }
  
      private static Properties getProperties(String name) {
          var properties = new Properties();
          try (InputStream in = PropertiesUtil.class.getResourceAsStream(name)) {  // do not use path as resources in .jar may not be files
              if (in != null) {
                  byte[] root = in.readAllBytes(); // usable in Java 9+
                  var rootI18n = new String(root, StandardCharsets.UTF_8);
                  String rootI18nFixed = Pattern.compile("\\\\[\n\r]+")
                      .matcher(Matcher.quoteReplacement(rootI18n))
                      .replaceAll("a");
                  properties.load(new StringReader(rootI18nFixed));
              } else {
                  throw new JSqlRuntimeException("Resource not found: "+ name);
              }
          } catch (IOException e) {
              throw new JSqlRuntimeException(e);
          }
          return properties;
      }
  
      public String getVersionJsql() {
          return this.properties.getProperty("jsql.version");
      }
  
      public String getProperty(String property) {
          return this.properties.getProperty(property);
      }
  }