/*
 * 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.common.logger;

import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ScrollView;

/**
 * Simple fraggment which contains a LogView and uses is to output log data it receives
 * through the LogNode interface.
 */
public class LogFragment extends Fragment {

    private LogView mLogView;
    private ScrollView mScrollView;

    public LogFragment() {
    }

    public View inflateViews() {
        mScrollView = new ScrollView(getActivity());
        ViewGroup.LayoutParams scrollParams = new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT);
        mScrollView.setLayoutParams(scrollParams);

        mLogView = new LogView(getActivity());
        ViewGroup.LayoutParams logParams = new ViewGroup.LayoutParams(scrollParams);
        logParams.height = ViewGroup.LayoutParams.WRAP_CONTENT;
        mLogView.setTextAppearance(android.R.style.TextAppearance_Material_Medium);
        mLogView.setLayoutParams(logParams);
        mLogView.setClickable(true);
        mLogView.setFocusable(true);
        mLogView.setTypeface(Typeface.create("monospace", Typeface.NORMAL));

        // Want to set padding as 16 dips, setPadding takes pixels.  Hooray math!
        int paddingDips = 16;
        double scale = getResources().getDisplayMetrics().density;
        int paddingPixels = (int) ((paddingDips * (scale)) + .5);
        mLogView.setPadding(paddingPixels, paddingPixels, paddingPixels, paddingPixels);
        mLogView.setCompoundDrawablePadding(paddingPixels);

        mLogView.setGravity(Gravity.BOTTOM);

        mScrollView.addView(mLogView);
        return mScrollView;
    }

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

        View result = inflateViews();

        mLogView.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }

            @Override
            public void afterTextChanged(Editable s) {

                mScrollView.post(new Runnable() {
                    @Override
                    public void run() {
                        mScrollView
                                .smoothScrollTo(0, mScrollView.getBottom() + mLogView.getHeight());
                    }
                });
            }
        });
        return result;
    }

    public LogView getLogView() {
        return mLogView;
    }
}