/*
    Copyright 2015 LinkedIn Corp.

    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.linkedin.android.eventsapp;

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.FragmentTransaction;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;

import com.linkedin.android.eventsapp.Event;
import com.linkedin.android.eventsapp.EventFragment;

import java.util.ArrayList;

public class EventTabsAdapter extends FragmentPagerAdapter implements TabListener, OnPageChangeListener {
	private final Context mContext;
	private final ActionBar mActionBar;
	private final ViewPager mViewPager;
	private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
    private final ArrayList<Fragment> mFragments = new ArrayList<Fragment>();
	
	static final class TabInfo{
		private final Class<?> clss;
		private final Event event;
		
		TabInfo(Class<?> _class, Event _event){
			clss = _class;
			event = _event;
		}
	}

	public EventTabsAdapter(FragmentActivity activity, ViewPager pager) {
		super(activity.getSupportFragmentManager());
		mContext = activity;
		mActionBar = activity.getActionBar();
		mViewPager = pager;
		mViewPager.setAdapter(this);
		mViewPager.setOnPageChangeListener(this);
	}
	
	public void addTab(Tab tab, Class<?> clss, Event event){
		TabInfo info = new TabInfo(clss, event);
		tab.setTag(info);
		tab.setTabListener(this);
		mTabs.add(info);
        mFragments.add(EventFragment.newInstance(event));
		mActionBar.addTab(tab);
		notifyDataSetChanged();
	}


	@Override
	public void onPageScrollStateChanged(int state) {
		
	}


	@Override
	public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
		
	}


	@Override
	public void onPageSelected(int position) {
		mActionBar.setSelectedNavigationItem(position);
		
	}


	@Override
	public void onTabReselected(Tab tab, FragmentTransaction ft) {
		
	}


	@Override
	public void onTabSelected(Tab tab, FragmentTransaction ft) {
		mViewPager.setCurrentItem(tab.getPosition());
		Object tag = tab.getTag();
		for (int i = 0; i<mTabs.size(); i++){
			if (mTabs.get(i) == tag){
				mViewPager.setCurrentItem(i);
			}
		}
	}


	@Override
	public void onTabUnselected(Tab tab, FragmentTransaction ft) {
	}


	@Override
	public Fragment getItem(int position) {
        return mFragments.get(position);
	}


	@Override
	public int getCount() {
		return mTabs.size();
	}

}