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/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.social.facebook.api.impl;

import static org.springframework.social.facebook.api.impl.PagedListUtils.*;

import org.springframework.social.facebook.api.Event;
import org.springframework.social.facebook.api.EventInvitee;
import org.springframework.social.facebook.api.EventOperations;
import org.springframework.social.facebook.api.GraphApi;
import org.springframework.social.facebook.api.ImageType;
import org.springframework.social.facebook.api.Invitation;
import org.springframework.social.facebook.api.PagedList;
import org.springframework.social.facebook.api.PagingParameters;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;

class EventTemplate implements EventOperations {
			
	private final GraphApi graphApi;

	public EventTemplate(GraphApi graphApi) {
		this.graphApi = graphApi;
	}

	public Event getEvent(String eventId) {
		return graphApi.fetchObject(eventId, Event.class, ALL_FIELDS);
	}
	
	public byte[] getEventImage(String eventId) {
		return getEventImage(eventId, ImageType.NORMAL);
	}
	
	public byte[] getEventImage(String eventId, ImageType imageType) {
		return graphApi.fetchImage(eventId, "picture", imageType);
	}

	public PagedList getInvited(String eventId) {
		return graphApi.fetchConnections(eventId, "invited", EventInvitee.class);
	}
	
	public PagedList getCreated() {
		return getEventsForUserByStatus("me", "created", new PagingParameters(25, 0, null, null));
	}
	
	public PagedList getCreated(PagingParameters pagingParams) {
		return getEventsForUserByStatus("me", "created", pagingParams);
	}
	
	public PagedList getAttending() {
		return getEventsForUserByStatus("me", "attending", new PagingParameters(25, 0, null, null));
	}
	
	public PagedList getAttending(PagingParameters pagingParams) {
		return getEventsForUserByStatus("me", "attending", pagingParams);
	}
	
	public PagedList getAttending(String eventId) {
		return graphApi.fetchConnections(eventId, "attending", EventInvitee.class);
	}
	
	public PagedList getMaybeAttending() {
		return getEventsForUserByStatus("me", "maybe", new PagingParameters(25, 0, null, null));
	}
	
	public PagedList getMaybeAttending(PagingParameters pagingParams) {
		return getEventsForUserByStatus("me", "maybe", pagingParams);
	}
	
	public PagedList getMaybeAttending(String eventId) {
		return graphApi.fetchConnections(eventId, "maybe", EventInvitee.class);
	}
	
	public PagedList getNoReplies() {
		return getEventsForUserByStatus("me", "not_replied", new PagingParameters(25, 0, null, null));
	}
	
	public PagedList getNoReplies(PagingParameters pagingParams) {
		return getEventsForUserByStatus("me", "not_replied", pagingParams);
	}
	
	public PagedList getNoReplies(String eventId) {
		return graphApi.fetchConnections(eventId, "noreply", EventInvitee.class);
	}

	public PagedList getDeclined() {
		return getEventsForUserByStatus("me", "declined", new PagingParameters(25, 0, null, null));
	}
	
	public PagedList getDeclined(PagingParameters pagingParams) {
		return getEventsForUserByStatus("me", "declined", pagingParams);
	}
	
	public PagedList getDeclined(String eventId) {
		return graphApi.fetchConnections(eventId, "declined", EventInvitee.class);
	}
	
	public void acceptInvitation(String eventId) {
		graphApi.post(eventId, "attending", new LinkedMultiValueMap());
	}

	public void maybeInvitation(String eventId) {
		graphApi.post(eventId, "maybe", new LinkedMultiValueMap());
	}

	public void declineInvitation(String eventId) {
		graphApi.post(eventId, "declined", new LinkedMultiValueMap());
	}
	
	public PagedList search(String query) {
		return search(query, new PagingParameters(25, 0, null, null));
	}
	
	public PagedList search(String query, PagingParameters pagedListParameters) {
		MultiValueMap queryMap = getPagingParameters(pagedListParameters);
		queryMap.add("q", query);
		queryMap.add("type", "event");
		return graphApi.fetchConnections("search", null, Event.class, queryMap);
	}
	
	// private helpers
	
	private PagedList getEventsForUserByStatus(String userId, String status, PagingParameters pagingParams) {
		MultiValueMap parameters = getPagingParameters(pagingParams);
		return graphApi.fetchConnections(userId, "events/" + status, Invitation.class, parameters);
	}
	
	private static final String[] ALL_FIELDS = { "id", "cover", "description", "end_time", "is_date_only", "name", "owner", 
		"parent_group", "privacy", "start_time", "ticket_uri", "timezone", "updated_time", "place"};
}