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package javastrava.util;

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

import javastrava.auth.model.Token;
import javastrava.model.StravaActivity;
import javastrava.model.StravaChallenge;
import javastrava.model.StravaClub;
import javastrava.model.StravaGear;
import javastrava.model.StravaSegment;
import javastrava.model.StravaSegmentEffort;
import javastrava.model.StravaSegmentLeaderboard;
import javastrava.model.StravaSegmentLeaderboardEntry;
import javastrava.model.reference.StravaResourceState;

/**
 * @author Dan Shannon
 *
 */
public class PrivacyUtils {

	/**
	 * 
	 * Check that an activity belongs to the authenticated user
	 * 
	 * 
	 * @param activity
	 *            The activity to check
	 * @param token
	 *            The access token in use
	 * @return true if the activity belongs to the authenticated user, false otherwise
	 */
	private static boolean activityBelongsToAuthenticatedUser(final StravaActivity activity, final Token token) {
		return activity.getAthlete().getId().equals(token.getAthlete().getId());
	}

	/**
	 * 
	 * Checks if an activity is private
	 * 
	 * 
	 * @param activity
	 *            The activity to check
	 * @return true if and only if the privateActivity flag is set to Boolean.TRUE
	 */
	private static boolean activityIsPrivate(final StravaActivity activity) {
		return ((activity.getPrivateActivity() != null) && activity.getPrivateActivity().equals(Boolean.TRUE));
	}

	/**
	 * 
	 * Removes private activities from the list (by changing private ones to activities with resourceState=PRIVATE)
	 * 
	 * 
	 * @param activities
	 *            The list of activities to process
	 * @param token
	 *            The access token in use (so we can check if it has view_private acess)
	 * @return Modified list of activities
	 */
	public static List handlePrivateActivities(final List activities, final Token token) {
		if (activities == null) {
			return null;
		}

		final List returnedActivities = new ArrayList();
		for (final StravaActivity activity : activities) {
			// If the activity is not private then it's OK to include
			if (!activityIsPrivate(activity)) {
				returnedActivities.add(activity);
			}
			// Else if it *is* private, and there's no view_private access or it belongs to someone else, then add as the private activity
			else {
				if (activityBelongsToAuthenticatedUser(activity, token) && token.hasViewPrivate()) {
					returnedActivities.add(activity);
				} else {
					returnedActivities.add(PrivacyUtils.privateActivity(activity.getId()));
				}
			}
		}
		return returnedActivities;

	}

	/**
	 * 
	 * Returns the list of segments with any that should be flagged as private having their data cleared and resource state set to {@link StravaResourceState#PRIVATE}
	 * 
	 * 
	 * @param efforts
	 *            List of efforts to be 'privatised'
	 * @param token
	 *            The access token in use
	 * @return Modified list of efforts
	 */
	public static List handlePrivateSegmentEfforts(final List efforts, final Token token) {
		return efforts;
		// if (efforts == null) {
		// return null;
		// }
		//
		// // Build a set of segments and activities to check for privacy
		// Set activities = new HashSet();
		// Set segments = new HashSet();
		// for (StravaSegmentEffort effort : efforts) {
		// activities.add(effort.getActivity());
		// segments.add(effort.getSegment());
		// }
		//
		// // Now make a list of the activities that are private
		// Set privateActivities = new HashSet();
		// for (StravaActivity activity : activities) {
		// StravaActivity stravaActivity = token.getService(ActivityService.class).getActivity(activity.getId());
		// if (stravaActivity.getResourceState() == StravaResourceState.PRIVATE) {
		// privateActivities.add(activity);
		// }
		// }
		//
		// // Now make a list of the segments that are private
		// Set privateSegments = new HashSet();
		// for (StravaSegment segment : segments) {
		// StravaSegment stravaSegment = token.getService(SegmentService.class).getSegment(segment.getId());
		// if (stravaSegment.getResourceState() == StravaResourceState.PRIVATE) {
		// privateSegments.add(segment);
		// }
		// }
		//
		// // Now run through all the efforts and fix the ones for private segments/activities
		// List returnedEfforts = new ArrayList();
		// for (StravaSegmentEffort effort : efforts) {
		// if (privateActivities.contains(effort.getActivity()) || privateSegments.contains(effort.getSegment())) {
		// returnedEfforts.add(privateSegmentEffort(effort.getId()));
		// } else {
		// returnedEfforts.add(effort);
		// }
		// }
		//
		// // That's it
		// return returnedEfforts;

	}

	/**
	 * 
	 * Removes private segments from the given list (by replacing them with segments with resourceState = {@link StravaResourceState#PRIVATE}
	 * 
	 * 
	 * @param segments
	 *            The list of segments to be 'privatised'
	 * @param token
	 *            The access token being used; will be checked for view_private access for segments belonging to the authenticated user
	 * @return The modified list of segments
	 */
	public static List handlePrivateSegments(final List segments, final Token token) {
		if (segments == null) {
			return null;
		}

		final List returnedSegments = new ArrayList();
		for (final StravaSegment segment : segments) {
			// If the segment is not flagged as private then its ok to include
			if (!segmentIsPrivate(segment)) {
				returnedSegments.add(segment);
			}
			// Otherwise if it belongs to the authenticated user and the token has view_private scope, then it's OK to return
			else {
				if (token.hasViewPrivate()) {
					returnedSegments.add(segment);
				} else {
					returnedSegments.add(PrivacyUtils.privateSegment(segment.getId()));
				}
			}
		}
		return returnedSegments;
	}

	/**
	 * 
	 * Creates an activity with the given id and resourceState = {@link StravaResourceState#PRIVATE}
	 * 
	 * 
	 * @param activityId
	 *            the activity id to be given to the private activity
	 * @return The private activity
	 */
	public static StravaActivity privateActivity(final Long activityId) {
		final StravaActivity activity = new StravaActivity();
		activity.setId(activityId);
		activity.setResourceState(StravaResourceState.PRIVATE);
		return activity;
	}

	/**
	 * 
	 * Creates a {@link StravaChallenge} with resourceState = {@link StravaResourceState#PRIVATE}
	 * 
	 *
	 * @param id
	 *            The identifier of the challenge
	 * @return The challenge
	 */
	public static StravaChallenge privateChallenge(Integer id) {
		final StravaChallenge challenge = new StravaChallenge();
		challenge.setId(id);
		challenge.setResourceState(StravaResourceState.PRIVATE);
		return challenge;
	}

	/**
	 * 
	 * Creates a {@link StravaClub} with resourceState = {@link StravaResourceState#PRIVATE}
	 * 
	 * 
	 * @param id
	 *            The id of the club to create
	 * @return The private club
	 */
	public static StravaClub privateClubRepresentation(final Integer id) {
		final StravaClub club = new StravaClub();
		club.setId(id);
		club.setResourceState(StravaResourceState.PRIVATE);
		return club;
	}

	/**
	 * 
	 * Creates a {@link StravaGear} with resourceState = {@link StravaResourceState#PRIVATE}
	 * 
	 * 
	 * @param id
	 *            The id of the gear to create
	 * @return The private gear
	 */
	public static StravaGear privateGear(final String id) {
		final StravaGear gear = new StravaGear();
		gear.setId(id);
		gear.setResourceState(StravaResourceState.PRIVATE);
		return gear;
	}

	/**
	 * 
	 * Creates a {@link StravaSegment} with resourceState = {@link StravaResourceState#PRIVATE}
	 * 
	 * 
	 * @param id
	 *            The id of the segment to create
	 * @return The private segment
	 */
	public static StravaSegment privateSegment(final Integer id) {
		final StravaSegment segment = new StravaSegment();
		segment.setId(id);
		segment.setResourceState(StravaResourceState.PRIVATE);
		return segment;
	}

	/**
	 * 
	 * Creates a {@link StravaSegmentEffort} with resourceState = {@link StravaResourceState#PRIVATE}
	 * 
	 * @param id
	 *            The id of the effort to create
	 * @return The private effort
	 */
	public static StravaSegmentEffort privateSegmentEffort(final Long id) {
		final StravaSegmentEffort effort = new StravaSegmentEffort();
		effort.setId(id);
		effort.setResourceState(StravaResourceState.PRIVATE);
		return effort;
	}

	/**
	 * 

	 * Creates a {@link StravaSegmentLeaderboard} with resourceState = {@link StravaResourceState#PRIVATE}
	 * 
	 * 
	 * @return The private leaderboard
	 */
	public static StravaSegmentLeaderboard privateSegmentLeaderboard() {
		StravaSegmentLeaderboard leaderboard = new StravaSegmentLeaderboard();
		leaderboard = new StravaSegmentLeaderboard();
		leaderboard.setNeighborhoodCount(Integer.valueOf(1));
		leaderboard.setAthleteEntries(new ArrayList());
		leaderboard.setEntries(new ArrayList());
		leaderboard.setEffortCount(Integer.valueOf(0));
		leaderboard.setEntryCount(Integer.valueOf(0));
		leaderboard.setResourceState(StravaResourceState.PRIVATE);
		return leaderboard;

	}

	/**
	 * 
	 * Checks if a segment is flagged as private
	 * 
	 * 
	 * @param segment
	 *            the segment to check
	 * @return true if the segment is flagged as private, false otherwise
	 */
	private static boolean segmentIsPrivate(final StravaSegment segment) {
		return ((segment.getPrivateSegment() != null) && segment.getPrivateSegment().equals(Boolean.TRUE));
	}

}