/*
 * (C) Copyright 2010 Nuxeo SA (http://nuxeo.com/) and contributors.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public License
 * (LGPL) version 2.1 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 *
 * This library 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.
 *
 * Contributors:
 *     Anahide Tchertchian
 */
package org.nuxeo.ecm.platform.contentview.seam;

import static org.jboss.seam.ScopeType.CONVERSATION;

import java.io.Serializable;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.faces.context.FacesContext;
import javax.faces.model.SelectItem;

import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.annotations.intercept.BypassInterceptors;
import org.nuxeo.ecm.core.api.CoreSession;
import org.nuxeo.ecm.core.api.DocumentModel;
import org.nuxeo.ecm.core.api.NuxeoPrincipal;
import org.nuxeo.ecm.core.api.SortInfo;
import org.nuxeo.ecm.platform.actions.Action;
import org.nuxeo.ecm.platform.actions.ActionContext;
import org.nuxeo.ecm.platform.actions.jsf.JSFActionContext;
import org.nuxeo.ecm.platform.actions.seam.SeamActionContext;
import org.nuxeo.ecm.platform.contentview.jsf.ContentView;
import org.nuxeo.ecm.platform.contentview.jsf.ContentViewCache;
import org.nuxeo.ecm.platform.contentview.jsf.ContentViewService;
import org.nuxeo.ecm.platform.contentview.jsf.ContentViewState;
import org.nuxeo.ecm.platform.query.api.PageProvider;
import org.nuxeo.ecm.platform.ui.web.api.WebActions;
import org.nuxeo.ecm.platform.ui.web.util.SeamContextHelper;

/**
 * Handles cache and refresh for named content views.
 *
 * @author Anahide Tchertchian
 * @since 5.4
 * @since 5.4.2: moved to content-view-jsf module
 */
@Name("contentViewActions")
@Scope(CONVERSATION)
public class ContentViewActions implements Serializable {

    private static final long serialVersionUID = 1L;

    @In(create = true)
    protected ContentViewRestActions contentViewRestActions;

    @In(create = true)
    protected ContentViewService contentViewService;

    protected final ContentViewCache cache = new ContentViewCache();

    protected Long globalPageSize;

    @In(create = true)
    private transient NuxeoPrincipal currentNuxeoPrincipal;

    @In(create = true, required = false)
    private transient CoreSession documentManager;

    @In(create = true, required = false)
    protected transient WebActions webActions;

    protected ContentView currentContentView;

    /**
     * Returns the current global content view.
     * <p>
     * Current content view is usually the last one displayed on the page, but this may change depending on calls to
     * {@link #setCurrentContentView(ContentView)}.
     */
    public ContentView getCurrentContentView() {
        return currentContentView;
    }

    /**
     * Sets the current global content view.
     *
     * @see #getCurrentGlobalPageSize()
     */
    public void setCurrentContentView(ContentView cv) {
        currentContentView = cv;
    }

    /**
     * Returns the global page size, or returns the page size on current content view if set.
     */
    public Long getCurrentGlobalPageSize() {
        if (currentContentView != null && currentContentView.getUseGlobalPageSize()) {
            return currentContentView.getCurrentPageSize();
        }
        return globalPageSize;
    }

    /**
     * Sets the global page size, useful to set the value having the appropriate selection set, see
     * {@link #getCurrentContentView()}
     */
    public void setCurrentGlobalPageSize(Long pageSize) {
        globalPageSize = pageSize;
    }

    /**
     * Returns the global page size
     */
    public Long getGlobalPageSize() {
        return globalPageSize;
    }

    /**
     * Returns the list of available options for page size selections, for given content view.
     * <p>
     * This method relies on a hard-coded set of available values, and adapts it to the current content view page size
     * and max page size information to present more or less items from this list.
     *
     * @since 5.8
     */
    @SuppressWarnings("boxing")
    public List<SelectItem> getPageSizeOptions(ContentView cv) {
        List<SelectItem> items = new ArrayList<SelectItem>();
        if (cv == null) {
            return items;
        }
        List<Long> values = new ArrayList<Long>();
        if (cv.getUseGlobalPageSize()) {
            // add the global page size if not present
            Long globalSize = getGlobalPageSize();
            if (globalSize != null && globalSize > 0 && !values.contains(globalSize)) {
                values.add(globalSize);
            }
        }
        long maxPageSize = 0;
        PageProvider<?> pp = cv.getCurrentPageProvider();
        if (pp != null) {
            // include original page size options set on the page provider definition, as well as current page size if
            // not present
            List<Long> options = pp.getPageSizeOptions();
            if (options != null) {
                values.addAll(options);
            }
            maxPageSize = pp.getMaxPageSize();
        }
        Collections.sort(values);
        for (Long value : values) {
            // remove every element that would be larger than max page size
            if (maxPageSize > 0 && maxPageSize < value) {
                break;
            }
            items.add(new SelectItem(value));
        }
        // make sure the list is not empty
        if (items.isEmpty()) {
            if (maxPageSize > 0) {
                items.add(new SelectItem(maxPageSize));
            } else {
                items.add(new SelectItem(1));
            }
        }
        return items;
    }

    /**
     * Sets the global page size
     */
    public void setGlobalPageSize(Long pageSize) {
        globalPageSize = pageSize;
    }

    public ContentView getContentView(String name) {
        return getContentView(name, null);
    }

    /**
     * Returns content view with given name, or null if no content view with this name is found.
     * <p>
     * If parameter searchDocumentModel is not null, it will be set on the content view. If it is null and the content
     * is using a provider that needs it, a new document model is created and attached to it. This document model is
     * resolved from the binding put in the content view XML definition, or from the document type in this definition if
     * no binding is set.
     * <p>
     * If not null, this content view is set as the current content view so that subsequent calls to other methods can
     * take information from it, like {@link #getCurrentGlobalPageSize()}
     * <p>
     * The content view is put in a cache map so that it's not rebuilt at each call. It is rebuilt when its cache key
     * changes (if defined).
     *
     */
    public ContentView getContentView(String name, DocumentModel searchDocumentModel) {
        ContentView cView = cache.get(name);
        if (cView == null) {
            cView = contentViewService.getContentView(name);
            if (cView != null) {
                cache.add(cView);
            }
        }
        if (cView != null) {
            if (searchDocumentModel != null) {
                cView.setSearchDocumentModel(searchDocumentModel);
            }
            setCurrentContentView(cView);
        }
        return cView;
    }

    public ContentView getContentViewWithProvider(String name) {
        return getContentViewWithProvider(name, null, null, null, null);
    }

    public ContentView getContentViewWithProvider(String name, DocumentModel searchDocumentModel)
            {
        return getContentViewWithProvider(name, searchDocumentModel, null, null, null);
    }

    public ContentView getContentViewWithProvider(String name, DocumentModel searchDocumentModel,
            List<SortInfo> sortInfos, Long pageSize, Long currentPage) {
        return getContentViewWithProvider(name, searchDocumentModel, sortInfos, pageSize, currentPage, (Object[]) null);
    }

    public ContentView getContentViewWithProvider(String name, DocumentModel searchDocumentModel,
            List<SortInfo> sortInfos, Long defaultPageSize, Long pageSize, Long currentPage) {
        return getContentViewWithProvider(name, searchDocumentModel, sortInfos, defaultPageSize, pageSize, currentPage,
                (Object[]) null);
    }

    /**
     * @since 5.6
     */
    public ContentView getContentViewWithProvider(String name, DocumentModel searchDocumentModel,
            List<SortInfo> sortInfos, Long pageSize, Long currentPage, Object... params) {
        return getContentViewWithProvider(name, searchDocumentModel, sortInfos, Long.valueOf(-1), pageSize,
                currentPage, params);
    }

    /**
     * Helper method to retrieve a content view, taking care of initialization of page provider according to parameters
     * and current global page size.
     * <p>
     * This method is not public to avoid EL method resolution issues.
     */
    protected ContentView getContentViewWithProvider(String name, DocumentModel searchDocumentModel,
            List<SortInfo> sortInfos, Long defaultPageSize, Long pageSize, Long currentPage, Object... params)
            {
        ContentView cView = getContentView(name, searchDocumentModel);
        if (cView != null) {
            if (cView.getUseGlobalPageSize()) {
                cView.setCurrentPageSize(globalPageSize);
            }
            if (cView.getCurrentPageSize() == null && defaultPageSize != null && defaultPageSize.longValue() >= 0) {
                cView.setCurrentPageSize(defaultPageSize);
            }
            // initialize provider
            cView.getPageProvider(searchDocumentModel, sortInfos, pageSize, currentPage, params);
        }
        return cView;
    }

    /**
     * Restore a content view from the given parameters.
     * <p>
     * The content view is put in a cache map so that it's not rebuilt at each call. It is rebuilt when its cache key
     * changes (if defined).
     *
     * @since 5.7
     */
    public ContentView restoreContentView(String contentViewName, Long currentPage, Long pageSize,
            List<SortInfo> sortInfos, String jsonContentViewState) throws UnsupportedEncodingException {
        ContentView cv = contentViewRestActions.restoreContentView(contentViewName, currentPage, pageSize, sortInfos,
                jsonContentViewState);
        cache.add(cv);
        return cv;
    }

    /**
     * Restore a Content View from the given ContentView state.
     * <p>
     * The content view is put in a cache map so that it's not rebuilt at each call. It is rebuilt when its cache key
     * changes (if defined).
     *
     * @since 6.0
     */
    public ContentView restoreContentView(ContentViewState state) throws UnsupportedEncodingException {
        ContentView cv = contentViewService.restoreContentView(state);
        cache.add(cv);
        return cv;
    }

    /**
     * Refreshes all content views that have declared the given seam event name as a refresh event in their XML
     * configuration.
     */
    @BypassInterceptors
    public void refreshOnSeamEvent(String seamEventName) {
        cache.refreshOnEvent(seamEventName);
    }

    /**
     * Resets all content views page providers that have declared the given seam event name as a reset event in their
     * XML configuration.
     */
    @BypassInterceptors
    public void resetPageProviderOnSeamEvent(String seamEventName) {
        cache.resetPageProviderOnEvent(seamEventName);
    }

    @BypassInterceptors
    public void refresh(String contentViewName) {
        cache.refresh(contentViewName, false);
    }

    @BypassInterceptors
    public void refreshAndRewind(String contentViewName) {
        cache.refresh(contentViewName, true);
    }

    /**
     * @since 6.0
     */
    @BypassInterceptors
    public void resetAggregates(String contentViewName) {
        cache.resetPageProviderAggregates(contentViewName);
    }

    @BypassInterceptors
    public void resetPageProvider(String contentViewName) {
        cache.resetPageProvider(contentViewName);
    }

    @BypassInterceptors
    public void reset(String contentViewName) {
        cache.reset(contentViewName);
    }

    @BypassInterceptors
    public void resetAllContent() {
        cache.resetAllContent();
    }

    @BypassInterceptors
    public void resetAll() {
        cache.resetAll();
    }

    /**
     * @since 5.7
     */
    @BypassInterceptors
    public void refreshAll() {
        cache.refreshAll();
    }

    /**
     * @since 5.7
     */
    @BypassInterceptors
    public void refreshAndRewindAll() {
        cache.refreshAndRewindAll();
    }

    /**
     * Returns actions filtered depending on given custom context.
     * <p>
     * Boolean values are declared as objects to avoid conversion to "false" when variable is not defined, and keep
     * "null" value.
     *
     * @since 6.0
     */
    public List<Action> getActionsList(String category, DocumentModel currentDocument, ContentView contentView,
            Object showPageSizeSelector, Object showRefreshCommand, Object showCSVExport, Object showPDFExport,
            Object showSyndicationLinks, Object showSlideshow, Object showEditColumns, Object showEditRows,
            Object showSpreadsheet) {
        return webActions.getActionsList(
                category,
                createContentViewActionContext(currentDocument, contentView, showPageSizeSelector, showRefreshCommand,
                        showCSVExport, showPDFExport, showSyndicationLinks, showSlideshow, showEditColumns,
                        showEditRows, showSpreadsheet));
    }

    protected ActionContext createContentViewActionContext(DocumentModel currentDocument, ContentView contentView,
            Object showPageSizeSelector, Object showRefreshCommand, Object showCSVExport, Object showPDFExport,
            Object showSyndicationLinks, Object showSlideshow, Object showEditColumns, Object showEditRows,
            Object showSpreadsheet) {
        ActionContext ctx;
        FacesContext faces = FacesContext.getCurrentInstance();
        if (faces == null) {
            ctx = new SeamActionContext();
        } else {
            ctx = new JSFActionContext(faces);
        }
        ctx.setCurrentPrincipal(currentNuxeoPrincipal);
        ctx.setDocumentManager(documentManager);
        ctx.setCurrentDocument(currentDocument);
        ctx.putLocalVariable("SeamContext", new SeamContextHelper());
        ctx.putLocalVariable("contentView", contentView);
        // additional local variables for action filters
        ctx.putLocalVariable("showPageSizeSelector", showPageSizeSelector);
        ctx.putLocalVariable("showRefreshCommand", showRefreshCommand);
        ctx.putLocalVariable("showCSVExport", showCSVExport);
        ctx.putLocalVariable("showPDFExport", showPDFExport);
        ctx.putLocalVariable("showSyndicationLinks", showSyndicationLinks);
        ctx.putLocalVariable("showSlideshow", showSlideshow);
        ctx.putLocalVariable("showEditColumns", showEditColumns);
        ctx.putLocalVariable("showEditRows", showEditRows);
        ctx.putLocalVariable("showSpreadsheet", showSpreadsheet);
        return ctx;
    }
}