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package com.day.cq.contentsync;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Iterator;

import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.servlet.http.HttpServletResponse;

import aQute.bnd.annotation.ProviderType;

import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;

import com.day.cq.contentsync.config.Config;

/**
 * The {@code ContentSyncManager} listens for changes to content
 * sync configurations stored in the repository and updates
 * the zip content cache accordingly.
 */
@ProviderType
public interface ContentSyncManager {

    /**
     * Update the cache for the given config resource and using
     * the session for personalized content.
     *
     * @param resource The config resource
     * @param session  The session
     */
    void updateCache(Resource resource, Session session);

    /**
     * Update the cache for the given config and using
     * the session for personalized content.
     * If cached updated, create an update timestamp.
     *
     * @param config  The config
     * @param session The session
     * @return true if cache was filled, false otherwise
     */
    boolean updateCache(Config config, Session session);

    /**
     * Clears the cache for the given config and using
     * the session for personalized content.
     *
     * @param config  The config
     * @param session The session
     */
    void clearCache(Config config, Session session);

    /**
     * Checks if there are any updates for the given config
     * by comparing to the last modified date.
     *
     * @param resource        The config's resource
     * @param ifModifiedSince The last modified date
     * @return {@code true} when updates available, {@code false} otherwise
     */
    boolean hasUpdates(Resource resource, Date ifModifiedSince);

    /**
     * Returns the latest update timestamp for the given
     * config and user (for personalized configs).
     *
     * @param config  The configuration
     * @param session The session
     * @return Latest update timestamp or {@code 0} if none exists
     */
    Long getLatestTimestamp(Config config, Session session);

    /**
     * This method builds a zip file according to the given config,
     * last modified date and session and returns a URI for identification.
     * Use {@link ContentSyncManager#sendZip} for actual delivery of the file.
     *
     * @param config          The config resource
     * @param ifModifiedSince The last modified date
     * @param session         The session
     * @return Path to zip file
     * @throws IOException         if an I/O error occurrs.
     * @throws RepositoryException if an error accessing the repository occurrs.
     */
    String getZip(Resource config, Date ifModifiedSince, Session session) throws RepositoryException, IOException;

    /**
     * Sets the correct content type and copies the zip file
     * to the response's output stream.
     *
     * @param response   The response
     * @param requestURI Request URI of the zip file
     */
    @Deprecated
    void sendZip(HttpServletResponse response, String requestURI);

    /**
     * Sets the correct content type and copies the zip file
     * to the response's output stream.
     *
     * @param session    The session
     * @param out        The output to copy to
     * @param requestURI Request URI of the zip file.
     */
    void sendZip(Session session, OutputStream out, String requestURI);

    /**
     * Sets the correct content type and copies the zip file
     * to the response's output stream.
     *
     * @param session    The session for reading the zip
     * @param response   The response
     * @param requestURI Request URI of the zip file
     */
    void sendZip(Session session, HttpServletResponse response, String requestURI);

    /**
     * Get the list of available configs.
     *
     * @return The list of configs
     */
    @Deprecated
    Iterator getConfigs();

    /**
     * Get the list of available configs.
     *
     * @param resolver The resource resolver
     * @return The list of configs
     */
    Iterator getConfigs(ResourceResolver resolver);
}