package com.example.android.sunshine.app;

import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;

import com.example.android.sunshine.app.data.WeatherContract;

/**
 * Encapsulates fetching the forecast and displaying it as a {@link ListView} layout.
 */
public class ForecastFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> {

    private static final String POSITION_KEY = "position";
    private static final int FORECAST_LOADER = 0;
    // For the forecast view we're showing only a small subset of the stored data.
    // Specify the columns we need.
    private static final String[] FORECAST_COLUMNS = {
            // In this case the id needs to be fully qualified with a table name, since
            // the content provider joins the location & weather tables in the background
            // (both have an _id column)
            // On the one hand, that's annoying.  On the other, you can search the weather table
            // using the location set by the user, which is only in the Location table.
            // So the convenience is worth it.
            WeatherContract.WeatherEntry.TABLE_NAME + "." + WeatherContract.WeatherEntry._ID,
            WeatherContract.WeatherEntry.COLUMN_DATE,
            WeatherContract.WeatherEntry.COLUMN_SHORT_DESC,
            WeatherContract.WeatherEntry.COLUMN_MAX_TEMP,
            WeatherContract.WeatherEntry.COLUMN_MIN_TEMP,
            WeatherContract.LocationEntry.COLUMN_LOCATION_SETTING,
            WeatherContract.WeatherEntry.COLUMN_WEATHER_ID,
            WeatherContract.LocationEntry.COLUMN_COORD_LAT,
            WeatherContract.LocationEntry.COLUMN_COORD_LONG
    };

    // These indices are tied to FORECAST_COLUMNS.  If FORECAST_COLUMNS changes, these
    // must change.
    static final int COL_WEATHER_ID = 0;
    static final int COL_WEATHER_DATE = 1;
    static final int COL_WEATHER_DESC = 2;
    static final int COL_WEATHER_MAX_TEMP = 3;
    static final int COL_WEATHER_MIN_TEMP = 4;
    static final int COL_LOCATION_SETTING = 5;
    static final int COL_WEATHER_CONDITION_ID = 6;
    static final int COL_COORD_LAT = 7;
    static final int COL_COORD_LONG = 8;

    private ForecastAdapter mForecastAdapter;
    private int mPosition;
    private ListView mListView;
    private boolean mUseTodayLayout;

    /**
     * A callback interface that all activities containing this fragment must
     * implement. This mechanism allows activities to be notified of item
     * selections.
     */
    public interface Callback {
        /**
         * DetailFragmentCallback for when an item has been selected.
         */
        public void onItemSelected(Uri dateUri);
    }

    public ForecastFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Add this line in order for this fragment to handle menu events.
        setHasOptionsMenu(true);
        updateWeather();
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.forecastfragment, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_refresh) {
            updateWeather();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // The CursorAdapter will take data from our cursor and populate the ListView.

        mForecastAdapter = new ForecastAdapter(getActivity(), null, 0);
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);

        // Get a reference to the ListView, and attach this adapter to it.
        mListView = (ListView) rootView.findViewById(R.id.listview_forecast);
        mListView.setAdapter(mForecastAdapter);

        // We'll call our MainActivity
        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
                // CursorAdapter returns a cursor at the correct position for getItem(), or null
                // if it cannot seek to that position.
                Cursor cursor = (Cursor) adapterView.getItemAtPosition(position);
                if (cursor != null) {
                    String locationSetting = Utility.getPreferredLocation(getActivity());
                    ((Callback) getActivity())
                            .onItemSelected(WeatherContract.WeatherEntry.buildWeatherLocationWithDate(
                                    locationSetting, cursor.getLong(COL_WEATHER_DATE)
                            ));
                    mPosition = position;
                }
            }
        });

        if (savedInstanceState != null && savedInstanceState.containsKey(POSITION_KEY)) {
            mPosition = savedInstanceState.getInt(POSITION_KEY);
        }

        mForecastAdapter.setUseTodayLayout(mUseTodayLayout);

        return rootView;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        getLoaderManager().initLoader(FORECAST_LOADER, null, this);
        super.onActivityCreated(savedInstanceState);
    }

    // since we read the location when we create the loader, all we need to do is restart things
    void onLocationChanged( ) {
        updateWeather();
        getLoaderManager().restartLoader(FORECAST_LOADER, null, this);
    }

    private void updateWeather() {
        FetchWeatherTask weatherTask = new FetchWeatherTask(getActivity());
        String location = Utility.getPreferredLocation(getActivity());
        weatherTask.execute(location);
    }

    @Override
    public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
        String locationSetting = Utility.getPreferredLocation(getActivity());

        // Sort order:  Ascending, by date.
        String sortOrder = WeatherContract.WeatherEntry.COLUMN_DATE + " ASC";
        Uri weatherForLocationUri = WeatherContract.WeatherEntry.buildWeatherLocationWithStartDate(
                locationSetting, System.currentTimeMillis());

        return new CursorLoader(getActivity(),
                weatherForLocationUri,
                FORECAST_COLUMNS,
                null,
                null,
                sortOrder);
    }


    public void setUseTodayLayout (boolean useTodayLayout) {
        mUseTodayLayout = useTodayLayout;
        if (mForecastAdapter != null) {
            mForecastAdapter.setUseTodayLayout(mUseTodayLayout);
        }
    }

    @Override
    public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
        if (mPosition != ListView.INVALID_POSITION) {
            mListView.smoothScrollToPosition(mPosition);
        }
        mForecastAdapter.swapCursor(cursor);

        if (!mUseTodayLayout && cursor.getPosition() == 0) {
            mListView.postDelayed(new Runnable() {
                @Override
                public void run() {
                    ListView listView = mListView;
                    listView.setSelection(0);
                    listView.performItemClick(listView.getChildAt(0), 0, 0);
                }
            }, 500);
        }
    }

    @Override
    public void onLoaderReset(Loader<Cursor> cursorLoader) {
        mForecastAdapter.swapCursor(null);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        if (mPosition != ListView.INVALID_POSITION) {
            outState.putInt(POSITION_KEY, mPosition);
        }
        super.onSaveInstanceState(outState);
    }
}

@@ -7683,16 +7683,40 @@
 ayout &&
+ cursor.moveToFirst() &&
  cursor.
@@ -8020,17 +8020,47 @@
 (0), 0, 
-0
+listView.getItemIdAtPosition(0)
 );%0A     

Change the first item click logic - Move the cursor to the first position to perform click every time - Change the way to get Item Id