/*
 * Copyright 2000-2013 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.lang.ant.config.impl;

import com.intellij.lang.ant.AntBundle;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.InvalidDataException;
import com.intellij.openapi.util.WriteExternalException;
import com.intellij.openapi.util.io.JarUtil;
import com.intellij.util.config.*;
import com.intellij.util.containers.Convertor;
import org.jdom.Element;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

import java.io.File;
import java.net.MalformedURLException;
import java.util.Comparator;
import java.util.Properties;

public class AntInstallation {
  private static final Logger LOG = Logger.getInstance("#com.intellij.ant.impl.AntInstallation");
  public static final StringProperty HOME_DIR = new StringProperty("homeDir", "");
  public static final AbstractProperty<String> NAME = new StringProperty("name", "");
  public static final ListProperty<AntClasspathEntry> CLASS_PATH = ListProperty.<AntClasspathEntry>create("classpath");
  public static final Comparator<AntInstallation> NAME_COMPARATOR = new Comparator<AntInstallation>() {
    public int compare(AntInstallation antInstallation, AntInstallation antInstallation1) {
      return String.CASE_INSENSITIVE_ORDER.compare(antInstallation.getName(), antInstallation1.getName());
    }
  };

  public static final Convertor<AntInstallation, AntReference> REFERENCE_TO_ANT = new Convertor<AntInstallation, AntReference>() {
    public AntReference convert(AntInstallation antInstallation) {
      return antInstallation.getReference();
    }
  };
  public static final AbstractProperty<String> VERSION =
    new StringProperty("version", AntBundle.message("ant.unknown.version.string.presentation"));
  @NonNls private static final String PROPERTY_VERSION = "VERSION";

  private final ClassLoaderHolder myClassLoaderHolder;
  @NonNls public static final String PATH_TO_ANT_JAR = "lib/ant.jar";
  @NonNls public static final String LIB_DIR = "lib";
  @NonNls public static final String ANT_JAR_FILE = "ant.jar";
  @NonNls public static final String VERSION_RESOURCE = "org/apache/tools/ant/version.txt";

  public AntReference getReference() {
    return new AntReference.BindedReference(this);
  }

  public static final Externalizer<AntInstallation> EXTERNALIZER = new Externalizer<AntInstallation>() {
    public AntInstallation readValue(Element dataElement) throws InvalidDataException {
      AntInstallation antInstallation = new AntInstallation();
      antInstallation.readExternal(dataElement);
      return antInstallation;
    }

    public void writeValue(Element dataElement, AntInstallation antInstallation) throws WriteExternalException {
      antInstallation.myProperties.writeExternal(dataElement);
    }
  };

  private void readExternal(Element dataElement) throws InvalidDataException {
    myProperties.readExternal(dataElement);
    File antJar = new File(HOME_DIR.get(myProperties), PATH_TO_ANT_JAR);
    updateVersion(antJar);
  }

  void updateVersion(File antJar) {
    if (antJar.exists()) {
      try {
        Properties antProps = loadProperties(antJar);
        VERSION.set(getProperties(), antProps.getProperty(PROPERTY_VERSION));
      }
      catch (Exception e) {
        LOG.error(e);
      }
    }
  }

  private final ExternalizablePropertyContainer myProperties;

  AntInstallation() {
    this(new ExternalizablePropertyContainer());
    registerProperties(myProperties);
  }

  private AntInstallation(final ExternalizablePropertyContainer properties) {
    myProperties = properties;
    myClassLoaderHolder = new AntInstallationClassLoaderHolder(myProperties);
  }

  public String getName() {
    return NAME.get(myProperties);
  }

  public void setName(final String name) {
    NAME.set(myProperties, name);
  }

  public String getVersion() {
    return VERSION.get(myProperties);
  }

  public String getHomeDir() {
    return HOME_DIR.get(myProperties);
  }

  public AbstractProperty.AbstractPropertyContainer getProperties() {
    return myProperties;
  }

  @NotNull
  public ClassLoader getClassLoader() {
    return myClassLoaderHolder.getClassloader();
  }

  public void updateClasspath() {
    myClassLoaderHolder.updateClasspath();
  }

  public static AntInstallation fromHome(String homePath) throws ConfigurationException {
    File antHome = new File(homePath);
    String antPath = "'" + antHome.getAbsolutePath() + "'";
    checkExists(antHome, AntBundle.message("path.to.ant.does.not.exist.error.message", antPath));
    File lib = new File(antHome, LIB_DIR);
    checkExists(lib, AntBundle.message("lib.directory.not.found.in.ant.path.error.message", antPath));
    File antJar = new File(lib, ANT_JAR_FILE);
    checkExists(antJar, AntBundle.message("ant.jar.not.found.in.directory.error.message", lib.getAbsolutePath()));
    if (antJar.isDirectory()) {
      throw new ConfigurationException(AntBundle.message("ant.jar.is.directory.error.message", antJar.getAbsolutePath()));
    }
    try {
      Properties properties = loadProperties(antJar);
      AntInstallation antInstallation = new AntInstallation();
      HOME_DIR.set(antInstallation.getProperties(), antHome.getAbsolutePath());
      final String versionProp = properties.getProperty(PROPERTY_VERSION);
      NAME.set(antInstallation.getProperties(), AntBundle.message("apache.ant.with.version.string.presentation", versionProp));
      VERSION.set(antInstallation.getProperties(), versionProp);
      antInstallation.addClasspathEntry(new AllJarsUnderDirEntry(lib));
      return antInstallation;
    }
    catch (MalformedURLException e) {
      LOG.error(e);
      return null;
    }
  }

  private static Properties loadProperties(File antJar) throws MalformedURLException, ConfigurationException {
    Properties properties = JarUtil.loadProperties(antJar, VERSION_RESOURCE);
    if (properties == null) {
      throw new ConfigurationException(AntBundle.message("cant.read.from.ant.jar.error.message", antJar.getAbsolutePath()));
    }
    return properties;
  }

  private void addClasspathEntry(AntClasspathEntry entry) {
    CLASS_PATH.getModifiableList(getProperties()).add(entry);
  }

  private static void checkExists(File file, String message) throws ConfigurationException {
    if (!file.exists()) throw new ConfigurationException(message);
  }

  public static class ConfigurationException extends Exception {
    public ConfigurationException(String message) {
      super(message);
    }
  }

  private static void registerProperties(ExternalizablePropertyContainer container) {
    container.registerProperty((StringProperty)NAME);
    container.registerProperty(HOME_DIR);
    container.registerProperty(CLASS_PATH, "classpathItem", AntClasspathEntry.EXTERNALIZER);
    container.registerProperty((StringProperty)VERSION);
  }
}