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 java.io.IOException;
   import java.io.InputStream;
  import java.io.StringReader;
  import java.net.URISyntaxException;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  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 {
      
      /**
       * Log4j logger sent to view.
       */
      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 displayStatus(Locale newLocale) {
          AtomicInteger countJvm = new AtomicInteger();
          var statusJvm = StringUtils.EMPTY;
          AtomicInteger countGui = new AtomicInteger();
          var statusGui = StringUtils.EMPTY;
          var propertiesRoot = PropertiesUtil.getProperties("i18n/jsql.properties");
  
          if (!Arrays.asList(StringUtils.EMPTY, "en").contains(newLocale.getLanguage())) {
              var bundleUser = PropertiesUtil.getProperties("i18n/jsql_" + newLocale.getLanguage() + ".properties");
              propertiesRoot.entrySet().stream()
              .filter(key -> bundleUser.isEmpty() || !bundleUser.containsKey(key.getKey()))
              .forEach(key -> countGui.getAndIncrement());
              statusGui = String.format("gui %s %s%% %s",
                  newLocale.getDisplayLanguage(newLocale),
                  (countGui.get() * 100) / propertiesRoot.entrySet().size(),
                  countGui.get() <= 0 ? StringUtils.EMPTY : "("+ countGui.get() +" items)"
              );
          }
  
          if (!Locale.getDefault().getLanguage().equals("en")) {
              var propertiesJvm = PropertiesUtil.getProperties("i18n/jsql_"+ Locale.getDefault().getLanguage() +".properties");
              propertiesRoot.entrySet().stream()
              .filter(key -> propertiesJvm.isEmpty() || !propertiesJvm.containsKey(key.getKey()))
              .forEach(key -> countJvm.getAndIncrement());
              statusJvm = String.format("jvm %s %s%% %s",
                  Locale.getDefault().getDisplayLanguage(newLocale),
                  (countJvm.get() * 100) / propertiesRoot.entrySet().size(),
                  countJvm.get() <= 0 ? StringUtils.EMPTY : " ("+ countJvm.get() +" items)"
              );
          }
  
          if (countJvm.get() > 0 || countGui.get() > 0) {
              LOGGER.info(
                  "i18n status: {}{}",
                  countJvm.get() > 0 ? statusJvm : StringUtils.EMPTY,
                  countGui.get() > 0 ? statusGui : StringUtils.EMPTY
              );
          }
      }
  
      private static Properties getProperties(String name) {
          var properties = new Properties();
          try {
              var uri = ClassLoader.getSystemResource(name).toURI();
              var path = Paths.get(uri);
              byte[] root = Files.readAllBytes(path);
              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));
          } catch (IOException | URISyntaxException 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);
     }
 }