/*
 * Tint Browser for Android
 *
 * Copyright (C) 2014 mogoweb.
 * Copyright (C) 2012 - to infinity and beyond J. Devauchelle and contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 3 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

package com.seal.ui.preferences;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.preference.Preference;
import android.preference.PreferenceManager;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.mogoweb.chrome.WebSettings;
import com.mogoweb.chrome.WebView;
import com.seal.R;
import com.seal.utils.Constants;

public class AccessibilityPreviewPreference extends Preference implements OnSharedPreferenceChangeListener {

	private static final String HTML_FORMAT = "<!DOCTYPE html><html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\"><style type=\"text/css\">p { margin: 2px auto;}</style><body><p style=\"font-size: 4pt\">%s</p><p style=\"font-size: 8pt\">%s</p><p style=\"font-size: 10pt\">%s</p><p style=\"font-size: 14pt\">%s</p><p style=\"font-size: 18pt\">%s</p></body></html>";

	private WebView mWebView;

	private String mHtml;

	public AccessibilityPreviewPreference(Context context) {
		super(context);
		init();
	}

	public AccessibilityPreviewPreference(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	public AccessibilityPreviewPreference(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}

	private void init() {
		setLayoutResource(R.layout.accessibility_preview);

		Object[] visualNames = getContext().getResources().getStringArray(R.array.FontPreviewText);

		mHtml = String.format(HTML_FORMAT, visualNames);
	}

	@Override
	protected View onCreateView(ViewGroup parent) {
		View root = super.onCreateView(parent);

		TextView title = (TextView) root.findViewById(R.id.AccessibilityPreviewTitle);
		title.setText(getTitle());

		TextView summary = (TextView) root.findViewById(R.id.AccessibilityPreviewSummary);
		if (!TextUtils.isEmpty(getSummary())) {
			summary.setText(getSummary());
		} else {
			summary.setVisibility(View.GONE);
		}

		WebView wv = (WebView) root.findViewById(R.id.AccessibilityPreviewWebView);
		wv.setFocusable(false);
		wv.setFocusableInTouchMode(false);
		wv.setClickable(false);
		wv.setLongClickable(false);
		wv.setHorizontalScrollBarEnabled(false);
		wv.setVerticalScrollBarEnabled(false);
		// wv.setLayerType(View.LAYER_TYPE_SOFTWARE, null);

		return root;
	}

	@Override
	protected void onBindView(View view) {
		super.onBindView(view);
		mWebView = (WebView) view.findViewById(R.id.AccessibilityPreviewWebView);
		updatePreview();
	}

	@Override
	protected void onAttachedToHierarchy(PreferenceManager preferenceManager) {
		super.onAttachedToHierarchy(preferenceManager);
		getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
	}

	@Override
	protected void onPrepareForRemoval() {
		getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
		super.onPrepareForRemoval();
	}

	@Override
	public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
		if (Constants.PREFERENCE_MINIMUM_FONT_SIZE.equals(key) || Constants.PREFERENCE_TEXT_SCALING.equals(key)) {
			updatePreview();
		}
	}

	private void updatePreview() {
		if (mWebView == null) return;

		WebSettings ws = mWebView.getSettings();

		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());

		int fontSize = prefs.getInt(Constants.PREFERENCE_MINIMUM_FONT_SIZE, 1);
		int textScaling = prefs.getInt(Constants.PREFERENCE_TEXT_SCALING, 100);

		ws.setMinimumFontSize(fontSize);
		ws.setTextZoom(textScaling);

		mWebView.loadData(mHtml, "text/html; charset=utf-8", "utf-8");
	}

}