/*
 * Copyright (C) 2016 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.example.android.sunshine;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

// COMPLETED (15) Add a class called ForecastAdapter
// COMPLETED (22) Extend RecyclerView.Adapter<ForecastAdapter.ForecastAdapterViewHolder>
/**
 * {@link ForecastAdapter} exposes a list of weather forecasts to a
 * {@link android.support.v7.widget.RecyclerView}
 */
public class ForecastAdapter extends RecyclerView.Adapter<ForecastAdapter.ForecastAdapterViewHolder> {

    // COMPLETED (23) Create a private string array called mWeatherData
    private String[] mWeatherData;

    // COMPLETED (47) Create the default constructor (we will pass in parameters in a later lesson)
    public ForecastAdapter() {

    }

    // COMPLETED (16) Create a class within ForecastAdapter called ForecastAdapterViewHolder
    // COMPLETED (17) Extend RecyclerView.ViewHolder
    /**
     * Cache of the children views for a forecast list item.
     */
    public class ForecastAdapterViewHolder extends RecyclerView.ViewHolder {

        // Within ForecastAdapterViewHolder ///////////////////////////////////////////////////////
        // COMPLETED (18) Create a public final TextView variable called mWeatherTextView
        public final TextView mWeatherTextView;

        // COMPLETED (19) Create a constructor for this class that accepts a View as a parameter
        // COMPLETED (20) Call super(view)
        // COMPLETED (21) Using view.findViewById, get a reference to this layout's TextView and save it to mWeatherTextView
        public ForecastAdapterViewHolder(View view) {
            super(view);
            mWeatherTextView = (TextView) view.findViewById(R.id.tv_weather_data);
        }
        // Within ForecastAdapterViewHolder ///////////////////////////////////////////////////////
    }

    // COMPLETED (24) Override onCreateViewHolder
    // COMPLETED (25) Within onCreateViewHolder, inflate the list item xml into a view
    // COMPLETED (26) Within onCreateViewHolder, return a new ForecastAdapterViewHolder with the above view passed in as a parameter
    /**
     * This gets called when each new ViewHolder is created. This happens when the RecyclerView
     * is laid out. Enough ViewHolders will be created to fill the screen and allow for scrolling.
     *
     * @param viewGroup The ViewGroup that these ViewHolders are contained within.
     * @param viewType  If your RecyclerView has more than one type of item (which ours doesn't) you
     *                  can use this viewType integer to provide a different layout. See
     *                  {@link android.support.v7.widget.RecyclerView.Adapter#getItemViewType(int)}
     *                  for more details.
     * @return A new ForecastAdapterViewHolder that holds the View for each list item
     */
    @Override
    public ForecastAdapterViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        Context context = viewGroup.getContext();
        int layoutIdForListItem = R.layout.forecast_list_item;
        LayoutInflater inflater = LayoutInflater.from(context);
        boolean shouldAttachToParentImmediately = false;

        View view = inflater.inflate(layoutIdForListItem, viewGroup, shouldAttachToParentImmediately);
        return new ForecastAdapterViewHolder(view);
    }

    // COMPLETED (27) Override onBindViewHolder
    // COMPLETED (28) Set the text of the TextView to the weather for this list item's position
    /**
     * OnBindViewHolder is called by the RecyclerView to display the data at the specified
     * position. In this method, we update the contents of the ViewHolder to display the weather
     * details for this particular position, using the "position" argument that is conveniently
     * passed into us.
     *
     * @param forecastAdapterViewHolder The ViewHolder which should be updated to represent the
     *                                  contents of the item at the given position in the data set.
     * @param position                  The position of the item within the adapter's data set.
     */
    @Override
    public void onBindViewHolder(ForecastAdapterViewHolder forecastAdapterViewHolder, int position) {
        String weatherForThisDay = mWeatherData[position];
        forecastAdapterViewHolder.mWeatherTextView.setText(weatherForThisDay);
    }

    // COMPLETED (29) Override getItemCount
    // COMPLETED (30) Return 0 if mWeatherData is null, or the size of mWeatherData if it is not null
    /**
     * This method simply returns the number of items to display. It is used behind the scenes
     * to help layout our Views and for animations.
     *
     * @return The number of items available in our forecast
     */
    @Override
    public int getItemCount() {
        if (null == mWeatherData) return 0;
        return mWeatherData.length;
    }

    // COMPLETED (31) Create a setWeatherData method that saves the weatherData to mWeatherData
    // COMPLETED (32) After you save mWeatherData, call notifyDataSetChanged
    /**
     * This method is used to set the weather forecast on a ForecastAdapter if we've already
     * created one. This is handy when we get new data from the web but don't want to create a
     * new ForecastAdapter to display it.
     *
     * @param weatherData The new weather data to be displayed.
     */
    public void setWeatherData(String[] weatherData) {
        mWeatherData = weatherData;
        notifyDataSetChanged();
    }
}