/*
 * Copyright (c) 2007-2009, Osmorc Development Team
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright notice, this list
 *       of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, this
 *       list of conditions and the following disclaimer in the documentation and/or other
 *       materials provided with the distribution.
 *     * Neither the name of 'Osmorc Development Team' nor the names of its contributors may be
 *       used to endorse or promote products derived from this software without specific
 *       prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.osmorc;

import com.intellij.openapi.components.ProjectComponent;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.project.ModuleListener;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.extensions.Extensions;
import com.intellij.openapi.extensions.ExtensionPointName;
import com.intellij.util.messages.MessageBusConnection;
import com.intellij.ProjectTopics;
import org.jetbrains.annotations.NotNull;

import java.util.List;
import java.util.Map;
import java.util.HashMap;

/**
 * @author Robert F. Beeger (robert@beeger.net)
 */
public class ModuleChangeHandler implements ProjectComponent {
    @NotNull
    private final Project project;
  @NotNull
    private final Map<Module, String> moduleNames;
    @NotNull
    private final ModuleChangeListener[] moduleChangeListeners;

    public ModuleChangeHandler(@NotNull Project project) {
        this.project = project;
        moduleNames = new HashMap<Module, String>();
        moduleChangeListeners = Extensions
                .getExtensions(new ExtensionPointName<ModuleChangeListener>("Osmorc.moduleChangeListener"));
    }

    public void projectOpened() {
    }

    public void projectClosed() {
    }

    @NotNull
    public String getComponentName() {
        return "ModuleChangeHandler";
    }

    public void initComponent() {
      MessageBusConnection connection = project.getMessageBus().connect(project);
        connection.subscribe(ProjectTopics.MODULES, new ModuleListener() {
            public void moduleAdded(Project project, Module module) {
                if (ModuleChangeHandler.this.project == project) {
                    moduleNames.put(module, module.getName());
                }
            }

            public void beforeModuleRemoved(Project project, Module module) {
            }

            public void moduleRemoved(Project project, Module module) {
                if (ModuleChangeHandler.this.project == project) {
                    moduleNames.remove(module);
                    fireModuleRemoved(module);
                }
            }

            public void modulesRenamed(Project project, List<Module> modules) {
                assert modules != null;
                if (ModuleChangeHandler.this.project == project) {
                    for (Module module : modules) {
                        String oldName = moduleNames.get(module);
                        if (oldName != null) {
                            fireModuleRenamed(module, oldName);
                        } else {
                            throw new RuntimeException("Unknown module renamed " + module.getName());
                        }
                        moduleNames.put(module, module.getName());
                    }
                }
            }
        });
    }

    private void fireModuleRemoved(@NotNull Module module) {
        for (ModuleChangeListener listener : moduleChangeListeners) {
            listener.moduleRemoved(module);
        }
    }

    private void fireModuleRenamed(@NotNull Module module, @NotNull String oldName) {
        for (ModuleChangeListener listener : moduleChangeListeners) {
            listener.moduleRenamed(module, oldName);
        }
    }

    public void disposeComponent() {
    }
}