package org.hedgewars.hedgeroid.netplay;

import java.util.ArrayList;

import org.hedgewars.hedgeroid.R;

import android.content.Context;
import android.os.Bundle;
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.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabWidget;

public class LobbyActivity extends FragmentActivity {
    TabHost mTabHost;
    ViewPager  mViewPager;
    TabsAdapter mTabsAdapter;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_lobby);
        mTabHost = (TabHost)findViewById(android.R.id.tabhost);
        if(mTabHost != null) {
	        mTabHost.setup();
	
	        mViewPager = (ViewPager)findViewById(R.id.pager);
	
	        mTabsAdapter = new TabsAdapter(this, mTabHost, mViewPager);
	
	        mTabsAdapter.addTab(mTabHost.newTabSpec("roomlist").setIndicator("Rooms"),
	        		RoomlistFragment.class, null);
	        mTabsAdapter.addTab(mTabHost.newTabSpec("chat").setIndicator("Chat"),
	        		LobbyChatFragment.class, null);
	        mTabsAdapter.addTab(mTabHost.newTabSpec("players").setIndicator("Players"),
	        		PlayerlistFragment.class, null);
	
	        if (savedInstanceState != null) {
	            mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
	        }
        }
    }
    
	/*@Override
	protected void onCreate(Bundle arg0) {
		super.onCreate(arg0);
		setContentView(R.layout.activity_lobby);
		ViewPager pager = (ViewPager)findViewById(R.id.pager);
		if(pager != null) {
			pager.setAdapter(new Adapter(getSupportFragmentManager()));
		}
	}
	
	private static class Adapter extends FragmentPagerAdapter {
		public Adapter(FragmentManager mgr) {
			super(mgr);
		}
		
		@Override
		public int getCount() {
			return 3;
		}
		
		@Override
		public Fragment getItem(int arg0) {
			switch(arg0) {
			case 0: return new RoomlistFragment();
			case 1: return new LobbyChatFragment();
			case 2: return new PlayerlistFragment();
			default: throw new IndexOutOfBoundsException();
			}
		}
	}*/
	
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if(mTabHost != null) {
        	outState.putString("tab", mTabHost.getCurrentTabTag());
        }
    }
	
    /**
     * This is a helper class that implements the management of tabs and all
     * details of connecting a ViewPager with associated TabHost.  It relies on a
     * trick.  Normally a tab host has a simple API for supplying a View or
     * Intent that each tab will show.  This is not sufficient for switching
     * between pages.  So instead we make the content part of the tab host
     * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
     * view to show as the tab content.  It listens to changes in tabs, and takes
     * care of switch to the correct paged in the ViewPager whenever the selected
     * tab changes.
     */
    public static class TabsAdapter extends FragmentPagerAdapter
            implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
        private final Context mContext;
        private final TabHost mTabHost;
        private final ViewPager mViewPager;
        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

        static final class TabInfo {
            private final Class<?> clss;
            private final Bundle args;

            TabInfo(Class<?> _class, Bundle _args) {
                clss = _class;
                args = _args;
            }
        }

        static class DummyTabFactory implements TabHost.TabContentFactory {
            private final Context mContext;

            public DummyTabFactory(Context context) {
                mContext = context;
            }

            public View createTabContent(String tag) {
                View v = new View(mContext);
                v.setMinimumWidth(0);
                v.setMinimumHeight(0);
                return v;
            }
        }

        public TabsAdapter(FragmentActivity activity, TabHost tabHost, ViewPager pager) {
            super(activity.getSupportFragmentManager());
            mContext = activity;
            mTabHost = tabHost;
            mViewPager = pager;
            mTabHost.setOnTabChangedListener(this);
            mViewPager.setAdapter(this);
            mViewPager.setOnPageChangeListener(this);
        }

        public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
            tabSpec.setContent(new DummyTabFactory(mContext));

            TabInfo info = new TabInfo(clss, args);
            mTabs.add(info);
            mTabHost.addTab(tabSpec);
            notifyDataSetChanged();
        }

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

        @Override
        public Fragment getItem(int position) {
            TabInfo info = mTabs.get(position);
            return Fragment.instantiate(mContext, info.clss.getName(), info.args);
        }

        public void onTabChanged(String tabId) {
            int position = mTabHost.getCurrentTab();
            mViewPager.setCurrentItem(position);
        }

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

        public void onPageSelected(int position) {
            // Unfortunately when TabHost changes the current tab, it kindly
            // also takes care of putting focus on it when not in touch mode.
            // The jerk.
            // This hack tries to prevent this from pulling focus out of our
            // ViewPager.
            TabWidget widget = mTabHost.getTabWidget();
            int oldFocusability = widget.getDescendantFocusability();
            widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
            mTabHost.setCurrentTab(position);
            widget.setDescendantFocusability(oldFocusability);
        }

        public void onPageScrollStateChanged(int state) {
        }
    }
}