/*
Copyright © 2013-2014, Silent Circle, LLC.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Any redistribution, use, or modification is done solely for personal 
      benefit and not for any commercial purpose or for monetary gain
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name Silent Circle nor the names of its contributors may 
      be used to endorse or promote products derived from this software 
      without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL SILENT CIRCLE, LLC BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/*
 * This  implementation is edited version of original Android sources.
 */

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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 com.silentcircle.contacts.detail;

import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;

/**
 * Adapter for the {@link ViewPager} for the contact detail page for a contact in 2 cases:
 * 1) without social updates, and 2) with social updates. The default initial case is for
 * the contact with social updates which uses all possible pages.
 */
public class ContactDetailViewPagerAdapter extends PagerAdapter {

    public static final String ABOUT_FRAGMENT_TAG = "view-pager-about-fragment";
    public static final String UPDATES_FRAGMENT_TAG = "view-pager-updates-fragment";

    private static final int INDEX_ABOUT_FRAGMENT = 0;
    private static final int INDEX_UPDATES_FRAGMENT = 1;

    private static final int MAX_FRAGMENT_VIEW_COUNT = 2;

    /**
     * The initial value for the view count needs to be MAX_FRAGMENT_VIEW_COUNT,
     * otherwise anything smaller would break screen rotation functionality for a user viewing
     * a contact with social updates (i.e. the user was viewing the second page, rotates the
     * device, the view pager requires the second page to exist immediately on launch).
     */
    private int mFragmentViewCount = MAX_FRAGMENT_VIEW_COUNT;

    private View mAboutFragmentView;
    private View mUpdatesFragmentView;

    public ContactDetailViewPagerAdapter() {
    }

    public void setAboutFragmentView(View view) {
        mAboutFragmentView = view;
    }

    public void setUpdatesFragmentView(View view) {
        mUpdatesFragmentView = view;
    }

    /**
     * Enable swiping if the detail and update fragments should be showing. Otherwise diable
     * swiping if only the detail fragment should be showing.
     */
    public void enableSwipe(boolean enable) {
        mFragmentViewCount = enable ? MAX_FRAGMENT_VIEW_COUNT : 1;
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return mFragmentViewCount;
    }

    /** Gets called when the number of items changes. */
    @Override
    public int getItemPosition(Object object) {
        // Always return a valid index for the about fragment view because it's always shown
        // whether the contact has social updates or not.
        if (object == mAboutFragmentView) {
            return INDEX_ABOUT_FRAGMENT;
        }
        // Only return a valid index for the updates fragment view if our view count > 1.
        if (object == mUpdatesFragmentView && mFragmentViewCount > 1) {
            return INDEX_UPDATES_FRAGMENT;
        }
        // Otherwise the view should have no position.
        return POSITION_NONE;
    }

    @Override
    public void startUpdate(ViewGroup container) {
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        switch (position) {
            case INDEX_ABOUT_FRAGMENT:
                mAboutFragmentView.setVisibility(View.VISIBLE);
                return mAboutFragmentView;
            case INDEX_UPDATES_FRAGMENT:
                mUpdatesFragmentView.setVisibility(View.VISIBLE);
                return mUpdatesFragmentView;
        }
        throw new IllegalArgumentException("Invalid position: " + position);
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        ((View) object).setVisibility(View.GONE);
    }

    @Override
    public void finishUpdate(ViewGroup container) {
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return ((View) object) == view;
    }

    @Override
    public Parcelable saveState() {
        return null;
    }

    @Override
    public void restoreState(Parcelable state, ClassLoader loader) {
    }
}