public class ChatFragment extends Fragment implements Constants {

    public final static int STATUS_START = 100;

    public final static String PARAM_TASK = "task";
    public final static String PARAM_STATUS = "status";


    final String LOG_TAG = "myLogs";

    public static final int RESULT_OK = -1;

    private ProgressDialog pDialog;

    Menu MainMenu;

    View mListViewHeader;

    RelativeLayout mLoadingScreen, mErrorScreen;
    LinearLayout mContentScreen, mContainerImg, mChatListViewHeaderContainer;

    ImageView mSendMessage, mAddImg, mDeleteImg, mPreviewImg;
    EditText mMessageText;

    ListView listView;

    BroadcastReceiver br;

    private ArrayList<ChatItem> chatList;

    private ChatListAdapter chatAdapter;

    String withProfile = "", messageText = "", messageImg = "";
    int chatId = 0, msgId = 0, messagesCount = 0, position = 0;
    long profileId = 0;

    private String selectedChatImg = "";
    private Uri selectedImage;

    int arrayLength = 0;
    Boolean loadingMore = false;
    Boolean viewMore = false;

    private Boolean loading = false;
    private Boolean restore = false;
    private Boolean preload = false;

    public ChatFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setRetainInstance(true);

        setHasOptionsMenu(true);

        initpDialog();

        Intent i = getActivity().getIntent();
        position = i.getIntExtra("position", 0);
        chatId = i.getIntExtra("chatId", 0);
        profileId = i.getLongExtra("profileId", 0);
        withProfile = i.getStringExtra("withProfile");
        chatList = new ArrayList<ChatItem>();
        chatAdapter = new ChatListAdapter(getActivity(), chatList);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_chat, container, false);

        if (savedInstanceState != null) {

            restore = savedInstanceState.getBoolean("restore");
            loading = savedInstanceState.getBoolean("loading");
            preload = savedInstanceState.getBoolean("preload");

        } else {

            App.getInstance().setCurrentChatId(chatId);

            restore = false;
            loading = false;
            preload = false;
        }

        br = new BroadcastReceiver() {

            public void onReceive(Context context, Intent intent) {

                int task = intent.getIntExtra(PARAM_TASK, 0);
                int status = intent.getIntExtra(PARAM_STATUS, 0);
                Log.d(LOG_TAG, "onReceive: task = " + task + ", status = " + status);

                getNextMessages();
            }
        };

        IntentFilter intFilt = new IntentFilter(BROADCAST_ACTION);
        getActivity().registerReceiver(br, intFilt);

        if (loading) {

            showpDialog();
        }

        mLoadingScreen = (RelativeLayout) rootView.findViewById(R.id.loadingScreen);
        mErrorScreen = (RelativeLayout) rootView.findViewById(R.id.errorScreen);

        mContentScreen = (LinearLayout) rootView.findViewById(R.id.contentScreen);

        mSendMessage = (ImageView) rootView.findViewById(R.id.sendMessage);
        mMessageText = (EditText) rootView.findViewById(R.id.messageText);

        mSendMessage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                newMessage();
            }
        });

        listView = (ListView) rootView.findViewById(R.id.listView);

        mListViewHeader = getActivity().getLayoutInflater().inflate(R.layout.chat_listview_header, null);
        mChatListViewHeaderContainer = (LinearLayout) mListViewHeader.findViewById(R.id.chatListViewHeaderContainer);

        listView.addHeaderView(mListViewHeader);

        mListViewHeader.setVisibility(View.GONE);

        listView.setAdapter(chatAdapter);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                if (position == 0 && mListViewHeader.getVisibility() == View.VISIBLE) {

                    getPreviousMessages();
                }
            }
        });

        mAddImg = (ImageView) rootView.findViewById(R.id.addImg);
        mDeleteImg = (ImageView) rootView.findViewById(R.id.deleteImg);
        mPreviewImg = (ImageView) rootView.findViewById(R.id.previewImg);

        mContainerImg = (LinearLayout) rootView.findViewById(R.id.container_img);

        mContainerImg.setVisibility(View.GONE);

        mDeleteImg.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {

                selectedImage = null;
                selectedChatImg = "";

                mContainerImg.setVisibility(View.GONE);
            }
        });

        mAddImg.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(Intent.createChooser(intent, getText(R.string.label_select_img)), SELECT_POST_IMG);
            }
        });

        if (selectedImage != null) {

            mPreviewImg.setImageURI(selectedImage);
            mContainerImg.setVisibility(View.VISIBLE);
        }

        if (!restore) {

            if (App.getInstance().isConnected()) {

                showLoadingScreen();
                getChat();

            } else {

                showErrorScreen();
            }

        } else {

            if (App.getInstance().isConnected()) {

                if (!preload) {

                    showContentScreen();

                } else {

                    showLoadingScreen();
                }

            } else {

                showErrorScreen();
            }
        }

        // Inflate the layout for this fragment
        return rootView;
    }

    public void onDestroyView() {

        super.onDestroyView();

        getActivity().unregisterReceiver(br);

        hidepDialog();
    }

    protected void initpDialog() {

        pDialog = new ProgressDialog(getActivity());
        pDialog.setMessage(getString(R.string.msg_loading));
        pDialog.setCancelable(false);
    }

    protected void showpDialog() {

        if (!pDialog.isShowing()) pDialog.show();
    }

    protected void hidepDialog() {

        if (pDialog.isShowing()) pDialog.dismiss();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {

        super.onSaveInstanceState(outState);

        outState.putBoolean("restore", true);
        outState.putBoolean("loading", loading);
        outState.putBoolean("preload", preload);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == SELECT_POST_IMG && resultCode == RESULT_OK && null != data) {

            selectedImage = data.getData();
            String[] filePathColumn = {MediaStore.Images.Media.DATA};

            Cursor cursor = getActivity().getContentResolver().query(selectedImage, filePathColumn, null, null, null);
            cursor.moveToFirst();

            // String selectedPhoto contains the path of selected Image
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            selectedChatImg = cursor.getString(columnIndex);
            cursor.close();

            mPreviewImg.setImageURI(selectedImage);

            mContainerImg.setVisibility(View.VISIBLE);
        }
    }

    private void scrollListViewToBottom() {

        listView.post(new Runnable() {
            @Override
            public void run() {
                // Select the last row so it will scroll into view...
                listView.setSelection(chatAdapter.getCount() - 1);
            }
        });
    }

    public void getChat() {

        preload = true;

        CustomRequest jsonReq = new CustomRequest(Request.Method.POST, METHOD_CHAT_GET, null,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {

                        try {

//                            Toast.makeText(getActivity(), response.toString(), Toast.LENGTH_LONG).show();

                            if (!response.getBoolean("error")) {

                                msgId = response.getInt("msgId");
                                chatId = response.getInt("chatId");
                                messagesCount = response.getInt("messagesCount");

                                if (messagesCount > 20) {

                                    mListViewHeader.setVisibility(View.VISIBLE);
                                }

                                if (response.has("messages")) {

                                    JSONArray messagesArray = response.getJSONArray("messages");

                                    arrayLength = messagesArray.length();

                                    if (arrayLength > 0) {

                                        for (int i = messagesArray.length() - 1; i > -1; i--) {

                                            JSONObject msgObj = (JSONObject) messagesArray.get(i);

                                            ChatItem item = new ChatItem(msgObj);

                                            chatList.add(item);
                                        }
                                    }
                                }
                            }

                        } catch (JSONException e) {

                            e.printStackTrace();

                        } finally {

                            showContentScreen();

                            chatAdapter.notifyDataSetChanged();

                            scrollListViewToBottom();
                        }
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

                preload = false;

                Toast.makeText(getActivity(), getString(R.string.error_data_loading), Toast.LENGTH_SHORT).show();
            }
        }) {

            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<String, String>();
                params.put("accountId", Long.toString(App.getInstance().getId()));
                params.put("accessToken", App.getInstance().getAccessToken());

                params.put("profileId", Long.toString(profileId));

                params.put("chatId", Integer.toString(chatId));
                params.put("msgId", Integer.toString(msgId));

                return params;
            }
        };

        App.getInstance().addToRequestQueue(jsonReq);
    }