/**
 * Copyright 2012 Facebook
 *
 * 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.facebook.samples.friendpicker;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.facebook.model.GraphUser;
import com.facebook.Session;

import java.util.ArrayList;
import java.util.Collection;

public class FriendPickerSampleActivity extends FragmentActivity {
    private static final int PICK_FRIENDS_ACTIVITY = 1;
    private Button pickFriendsButton;
    private TextView resultsTextView;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        resultsTextView = (TextView) findViewById(R.id.resultsTextView);
        pickFriendsButton = (Button) findViewById(R.id.pickFriendsButton);
        pickFriendsButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                onClickPickFriends();
            }
        });

        if (Session.getActiveSession() == null ||
                Session.getActiveSession().isClosed()) {
            Session.openActiveSession(this, true, null);
        }
    }

    @Override
    protected void onStart() {
        super.onStart();

        // Update the display every time we are started.
        displaySelectedFriends(RESULT_OK);
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case PICK_FRIENDS_ACTIVITY:
                displaySelectedFriends(resultCode);
                break;
            default:
                Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
                break;
        }
    }

    private void displaySelectedFriends(int resultCode) {
        String results = "";
        FriendPickerApplication application = (FriendPickerApplication) getApplication();

        Collection<GraphUser> selection = application.getSelectedUsers();
        if (selection != null && selection.size() > 0) {
            ArrayList<String> names = new ArrayList<String>();
            for (GraphUser user : selection) {
                names.add(user.getName());
            }
            results = TextUtils.join(", ", names);
        } else {
            results = "<No friends selected>";
        }

        resultsTextView.setText(results);
    }

    private void onClickPickFriends() {
        FriendPickerApplication application = (FriendPickerApplication) getApplication();
        application.setSelectedUsers(null);

        Intent intent = new Intent(this, PickFriendsActivity.class);
        // Note: The following line is optional, as multi-select behavior is the default for
        // FriendPickerFragment. It is here to demonstrate how parameters could be passed to the
        // friend picker if single-select functionality was desired, or if a different user ID was
        // desired (for instance, to see friends of a friend).
        PickFriendsActivity.populateParameters(intent, null, true, true);
        startActivityForResult(intent, PICK_FRIENDS_ACTIVITY);
    }
}