/*
 * 				Firetweet - Twitter client for Android
 * 
 *  Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com>
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  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.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.getlantern.firetweet.fragment.support;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnMultiChoiceClickListener;
import android.content.DialogInterface.OnShowListener;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.SparseBooleanArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

import org.getlantern.firetweet.R;
import org.getlantern.firetweet.adapter.ArrayAdapter;
import org.getlantern.firetweet.fragment.iface.ISupportDialogFragmentCallback;

public final class DataExportImportTypeSelectorDialogFragment extends BaseSupportDialogFragment implements
		OnMultiChoiceClickListener, OnClickListener, OnShowListener, OnItemClickListener {

	private TypeAdapter mAdapter;
	private ListView mListView;

	@Override
	public void onCancel(final DialogInterface dialog) {
		super.onCancel(dialog);
		final FragmentActivity a = getActivity();
		if (a instanceof Callback) {
			((Callback) a).onCancelled(this);
		}
	}

	@Override
	public final void onClick(final DialogInterface dialog, final int which) {
		switch (which) {
			case DialogInterface.BUTTON_POSITIVE: {
				final int flags = getCheckedFlags();
				onPositiveButtonClicked(flags);
				break;
			}
		}
	}

	@Override
	public final void onClick(final DialogInterface dialog, final int which, final boolean isChecked) {
		updatePositiveButton(dialog);
	}

	@Override
	public final Dialog onCreateDialog(final Bundle savedInstanceState) {
		final Context context = getActivity();
		final int flags = getEnabledFlags();
		mAdapter = new TypeAdapter(context, flags);
		mListView = new ListView(context);
		mAdapter.add(new Type(R.string.settings, FLAG_PREFERENCES));
		mAdapter.add(new Type(R.string.nicknames, FLAG_NICKNAMES));
		mAdapter.add(new Type(R.string.user_colors, FLAG_USER_COLORS));
		mAdapter.add(new Type(R.string.custom_host_mapping, FLAG_HOST_MAPPING));
		mListView.setAdapter(mAdapter);
		mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
		mListView.setOnItemClickListener(this);
		for (int i = 0, j = mAdapter.getCount(); i < j; i++) {
			mListView.setItemChecked(i, mAdapter.isEnabled(i));
		}
		final AlertDialog.Builder builder = new AlertDialog.Builder(context);
		builder.setTitle(getTitle());
		builder.setView(mListView);
		builder.setPositiveButton(android.R.string.ok, this);
		builder.setNegativeButton(android.R.string.cancel, null);
		final AlertDialog dialog = builder.create();
		dialog.setOnShowListener(this);
		return dialog;
	}

	@Override
	public void onDismiss(final DialogInterface dialog) {
		super.onDismiss(dialog);
		final FragmentActivity a = getActivity();
		if (a instanceof Callback) {
			((Callback) a).onDismissed(this);
		}
	}

	@Override
	public void onItemClick(final AdapterView<?> view, final View child, final int position, final long id) {
		updatePositiveButton(getDialog());
	}

	@Override
	public final void onShow(final DialogInterface dialog) {
		updatePositiveButton(dialog);
	}

	private int getCheckedFlags() {
		final SparseBooleanArray checked = mListView.getCheckedItemPositions();
		int flags = 0;
		for (int i = 0, j = checked.size(); i < j; i++) {
			final Type type = (Type) mListView.getItemAtPosition(i);
			if (checked.valueAt(i)) {
				flags |= type.flag;
			}
		}
		return flags;
	}

	private int getEnabledFlags() {
		final Bundle args = getArguments();
		if (args == null) return FLAG_ALL;
		return args.getInt(EXTRA_FLAGS, FLAG_ALL);
	}

	private CharSequence getTitle() {
		final Bundle args = getArguments();
		if (args == null) return null;
		return args.getCharSequence(EXTRA_TITLE);
	}

	private void onPositiveButtonClicked(final int flags) {
		final FragmentActivity a = getActivity();
		final Bundle args = getArguments();
		if (args == null) return;
		final String path = args.getString(EXTRA_PATH);
		if (a instanceof Callback) {
			((Callback) a).onPositiveButtonClicked(path, flags);
		}
	}

	private void updatePositiveButton(final DialogInterface dialog) {
		if (!(dialog instanceof AlertDialog)) return;
		final AlertDialog alertDialog = (AlertDialog) dialog;
		final Button positiveButton = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
		positiveButton.setEnabled(getCheckedFlags() != 0);
	}

	public static interface Callback extends ISupportDialogFragmentCallback {
		void onPositiveButtonClicked(String path, int flags);
	}

	private static class Type {
		private final int title, flag;

		Type(final int title, final int flag) {
			this.title = title;
			this.flag = flag;
		}
	}

	private static class TypeAdapter extends ArrayAdapter<Type> {

		private final int mEnabledFlags;

		public TypeAdapter(final Context context, final int enabledFlags) {
			super(context, android.R.layout.simple_list_item_multiple_choice);
			mEnabledFlags = enabledFlags;
		}

		@Override
		public boolean areAllItemsEnabled() {
			return false;
		}

		@Override
		public View getView(final int position, final View convertView, final ViewGroup parent) {
			final View view = super.getView(position, convertView, parent);
			final TextView text1 = (TextView) view.findViewById(android.R.id.text1);
			text1.setText(getItem(position).title);
			view.setEnabled(isEnabled(position));
			return view;
		}

		@Override
		public boolean isEnabled(final int position) {
			return (mEnabledFlags & getItem(position).flag) != 0;
		}

	}

}