/*
 * Copyright (C) 2005-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.repo.template;

import java.util.ArrayList;
import java.util.List;

import org.alfresco.config.JNDIConstants;
import org.alfresco.service.ServiceRegistry;
import org.alfresco.service.cmr.avm.AVMNodeDescriptor;
import org.alfresco.service.cmr.avm.AVMStoreDescriptor;
import org.springframework.extensions.surf.util.ParameterCheck;
import org.alfresco.wcm.asset.AssetInfo;
import org.alfresco.wcm.sandbox.SandboxService;
import org.alfresco.wcm.util.WCMUtil;

/**
 * AVM root object access for a template model.
 * 
 * @author Kevin Roast
 */
public class AVM extends BaseTemplateProcessorExtension
{
    private ServiceRegistry services;

    /**
     * Sets the service registry
     * 
     * @param services  the service registry
     */
    public void setServiceRegistry(ServiceRegistry services)
    {
        this.services = services;
    }

    /**
     * @return a list of all AVM stores in the system
     */
    public List<AVMTemplateStore> getStores()
    {
        List<AVMStoreDescriptor> stores = this.services.getAVMService().getStores();
        List<AVMTemplateStore> results = new ArrayList<AVMTemplateStore>(stores.size());
        for (AVMStoreDescriptor store : stores)
        {
            results.add(new AVMTemplateStore(this.services, getTemplateImageResolver(), store));
        }
        return results;
    }
    
    /**
     * Return an AVM store object for the specified store name
     * 
     * @param store         Store name to lookup
     * 
     * @return the AVM store object for the specified store or null if not found
     */
    public AVMTemplateStore lookupStore(String store)
    {
        ParameterCheck.mandatoryString("Store", store);
        AVMTemplateStore avmStore = null;
        AVMStoreDescriptor descriptor = this.services.getAVMService().getStore(store);
        if (descriptor != null)
        {
            avmStore = new AVMTemplateStore(this.services, getTemplateImageResolver(), descriptor);
        }
        return avmStore;
    }

    /**
     * Return the root node for a specified AVM store
     * 
     * @param store         Store name to find root node for
     * 
     * @return the AVM store root node for the specified store or null if not found.
     */
    public AVMTemplateNode lookupStoreRoot(String store)
    {
        ParameterCheck.mandatoryString("Store", store);
        AVMTemplateNode root = null;
        AVMTemplateStore avmStore = lookupStore(store);
        if (avmStore != null)
        {
            root = avmStore.getLookupRoot();
        }
        return root;
    }

    /**
     * Look a node by the absolute path. Path should include the store reference.
     * 
     * @param path          Absolute path to the node, including store reference.
     * 
     * @return the node if found, null otherwise.
     */
    public AVMTemplateNode lookupNode(String path)
    {
        ParameterCheck.mandatoryString("AVM Path", path);
        AVMTemplateNode node = null;
        AVMNodeDescriptor nodeDesc = this.services.getAVMService().lookup(-1, path);
        if (nodeDesc != null)
        {
            node = new AVMTemplateNode(path, -1, this.services, getTemplateImageResolver());
        }
        return node;
    }

    /**
     * Return the list of modified items for the specified user sandbox against staging store id
     * for a specific webapp.
     * 
     * @param storeId      Root Store ID
     * @param username     Username to get modified items for
     * @param webapp       Webapp name to filter by
     * 
     * @return List of AVMTemplateNode objects representing the modified items
     */
    public List<AVMTemplateNode> getModifiedItems(String storeId, String username, String webapp)
    {
        ParameterCheck.mandatoryString("Store ID", storeId);
        ParameterCheck.mandatoryString("Username", username);
        ParameterCheck.mandatoryString("Webapp", webapp);

        SandboxService sbService = this.services.getSandboxService();

        String userStoreId = userSandboxStore(storeId, username);
        
        // get modified items - not including deleted
        List<AssetInfo> assets = sbService.listChangedWebApp(userStoreId, webapp, false);
        
        List<AVMTemplateNode> items = new ArrayList<AVMTemplateNode>(assets.size());
        
        for (AssetInfo asset : assets)
        {
            // convert each diff/node record into an AVM Node template wrapper
            items.add(new AVMTemplateNode(asset.getAvmPath(), -1, this.services, getTemplateImageResolver()));
        }

        return items;
    }

    /**
     * @param storeId   Store ID to build staging store name for
     * 
     * @return the Staging Store name for the given store ID
     */
    public static String stagingStore(String storeId)
    {
        return WCMUtil.buildStagingStoreName(storeId);
    }

    /**
     * @param storeId   Store ID to build sandbox store name for
     * @param username  Username of the sandbox user
     * 
     * @return the Sandbox Store name for the given store ID and username
     */
    public static String userSandboxStore(String storeId, String username)
    {
        return WCMUtil.buildUserMainStoreName(storeId, username);
    }

    /**
     * @param storeId   Store ID to build preview URL for
     * 
     * @return the preview URL to the staging store for the specified store ID
     */
    public String websiteStagingUrl(String storeId)
    {
        return this.services.getPreviewURIService().getPreviewURI(storeId, null);
    }

    /**
     * @param storeId   Store ID to build preview URL for
     * @param username  Username to build sandbox preview URL for
     * 
     * @return the preview URL to the user sandbox for the specified store ID and username
     */
    public String websiteUserSandboxUrl(String storeId, String username)
    {
        ParameterCheck.mandatoryString("Store ID", storeId);
        ParameterCheck.mandatoryString("Username", username);
        return websiteStagingUrl(userSandboxStore(storeId, username));
    }

    /**
     * @param store     Store ID of the asset
     * @param assetPath Store relative path to the asset
     * 
     * @return the preview URL to the specified store asset
     */
    public String assetUrl(String storeId, String assetPath)
    {
        return this.services.getPreviewURIService().getPreviewURI(storeId, assetPath);
    }

    /**
     * @param avmPath   Fully qualified AVM path of the asset
     * 
     * @return the preview URL to the specified asset
     */
    public String assetUrl(String avmPath)
    {
        ParameterCheck.mandatoryString("AVM Path", avmPath);
        String[] s = avmPath.split(":");
        if (s.length != 2)
        {
            throw new IllegalArgumentException("Expected exactly one ':' in " + avmPath);
        }
        return assetUrl(s[0], s[1]);
    }

    /**
     * @return the path to the webapps folder in a standard web store.
     */
    public static String getWebappsFolderPath()
    {
        return JNDIConstants.DIR_DEFAULT_WWW_APPBASE;
    }
}