package org.exoplatform.portal.mop.page;

import java.util.List;

import org.exoplatform.portal.config.model.Page;

/** @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> */
public class PageContext {

    /** . */
    final PageKey key;

    /** The new state if any. */
    PageState state;

    /** A data snapshot. */
    PageData data;

    PageContext(PageData data) {
        this.key = data.key;
        this.state = null;
        this.data = data;
    }

    public PageContext(PageKey key, PageState state) {
        this.key = key;
        this.state = state;
        this.data = null;
    }

    /**
     * Returns the navigation key.
     *
     * @return the navigation key
     */
    public PageKey getKey() {
        return key;
    }

    /**
     * Returns the navigation state.
     *
     * @return the navigation state
     */
    public PageState getState() {
        if (state != null) {
            return state;
        } else if (data != null) {
            return data.state;
        } else {
            return null;
        }
    }

    /**
     * Updates the page state the behavior is not the same wether or not the page is persistent:
     * When the page is persistent, any state is allowed:
     * <ul>
     * <li>A non null state overrides the current persistent state.</li>
     * <li>The null state means to reset the state to the persistent state.</li>
     * <li>When the page is transient, only a non null state is allowed as it will be used for creation purpose.</li>
     * </ul>
     *
     * @param state the new state
     * @throws IllegalStateException when the state is cleared and the navigation is not persistent
     */
    public void setState(PageState state) throws IllegalStateException {
        if (data == null && state == null) {
            throw new IllegalStateException("Cannot clear state on a transient page");
        }
        this.state = state;
    }

    public void update(Page page) throws NullPointerException {
        if (page == null) {
            throw new NullPointerException();
        }
        PageState s = getState();
        page.setTitle(s.displayName);
        page.setDescription(s.description);
        page.setFactoryId(s.factoryId);
        page.setShowMaxWindow(s.showMaxWindow);

        List<String> permisssions = s.accessPermissions;
        page.setAccessPermissions(permisssions != null ? permisssions.toArray(new String[permisssions.size()]) : null);
        page.setEditPermission(getState().editPermission);

        permisssions = s.moveAppsPermissions;
        page.setMoveAppsPermissions(permisssions != null ? permisssions.toArray(new String[permisssions.size()]) : null);

        permisssions = s.moveContainersPermissions;
        page.setMoveContainersPermissions(permisssions != null ? permisssions.toArray(new String[permisssions.size()]) : null);
    }
}
