/*
 * Copyright (C) 2015 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.android.messaging.ui.appsettings;

import android.app.Fragment;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.android.messaging.R;
import com.android.messaging.datamodel.DataModel;
import com.android.messaging.datamodel.binding.Binding;
import com.android.messaging.datamodel.binding.BindingBase;
import com.android.messaging.datamodel.data.SettingsData;
import com.android.messaging.datamodel.data.SettingsData.SettingsDataListener;
import com.android.messaging.datamodel.data.SettingsData.SettingsItem;
import com.android.messaging.ui.BugleActionBarActivity;
import com.android.messaging.ui.UIIntents;
import com.android.messaging.util.Assert;
import com.android.messaging.util.PhoneUtils;

import java.util.ArrayList;
import java.util.List;

/**
 * Shows the "master" settings activity that contains two parts, one for application-wide settings
 * (dubbed "General settings"), and one or more for per-subscription settings (dubbed "Messaging
 * settings" for single-SIM, and the actual SIM name for multi-SIM). Clicking on either item
 * (e.g. "General settings") will open the detail settings activity (ApplicationSettingsActivity
 * in this case).
 */
public class SettingsActivity extends BugleActionBarActivity {
    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        // Directly open the detailed settings page as the top-level settings activity if this is
        // not a multi-SIM device.
        if (PhoneUtils.getDefault().getActiveSubscriptionCount() <= 1) {
            UIIntents.get().launchApplicationSettingsActivity(this, true /* topLevel */);
            finish();
        } else {
            getFragmentManager().beginTransaction()
                    .replace(android.R.id.content, new SettingsFragment())
                    .commit();
        }
    }

    @Override
    public boolean onOptionsItemSelected(final MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            NavUtils.navigateUpFromSameTask(this);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    public static class SettingsFragment extends Fragment implements SettingsDataListener {
        private ListView mListView;
        private SettingsListAdapter mAdapter;
        private final Binding<SettingsData> mBinding = BindingBase.createBinding(this);

        @Override
        public void onCreate(final Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            mBinding.bind(DataModel.get().createSettingsData(getActivity(), this));
            mBinding.getData().init(getLoaderManager(), mBinding);
        }

        @Override
        public View onCreateView(final LayoutInflater inflater, final ViewGroup container,
                final Bundle savedInstanceState) {
            final View view = inflater.inflate(R.layout.settings_fragment, container, false);
            mListView = (ListView) view.findViewById(android.R.id.list);
            mAdapter = new SettingsListAdapter(getActivity());
            mListView.setAdapter(mAdapter);
            return view;
        }

        @Override
        public void onDestroy() {
            super.onDestroy();
            mBinding.unbind();
        }

        @Override
        public void onSelfParticipantDataLoaded(SettingsData data) {
            mBinding.ensureBound(data);
            mAdapter.setSettingsItems(data.getSettingsItems());
        }

        /**
         * An adapter that displays a list of SettingsItem.
         */
        private class SettingsListAdapter extends ArrayAdapter<SettingsItem> {
            public SettingsListAdapter(final Context context) {
                super(context, R.layout.settings_item_view, new ArrayList<SettingsItem>());
            }

            public void setSettingsItems(final List<SettingsItem> newList) {
                clear();
                addAll(newList);
                notifyDataSetChanged();
            }

            @Override
            public View getView(final int position, final View convertView,
                    final ViewGroup parent) {
                View itemView;
                if (convertView != null) {
                    itemView = convertView;
                } else {
                    final LayoutInflater inflater = (LayoutInflater) getContext()
                            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                    itemView = inflater.inflate(
                            R.layout.settings_item_view, parent, false);
                }
                final SettingsItem item = getItem(position);
                final TextView titleTextView = (TextView) itemView.findViewById(R.id.title);
                final TextView subtitleTextView = (TextView) itemView.findViewById(R.id.subtitle);
                final String summaryText = item.getDisplayDetail();
                titleTextView.setText(item.getDisplayName());
                if (!TextUtils.isEmpty(summaryText)) {
                    subtitleTextView.setText(summaryText);
                    subtitleTextView.setVisibility(View.VISIBLE);
                } else {
                    subtitleTextView.setVisibility(View.GONE);
                }
                itemView.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        switch (item.getType()) {
                            case SettingsItem.TYPE_GENERAL_SETTINGS:
                                UIIntents.get().launchApplicationSettingsActivity(getActivity(),
                                        false /* topLevel */);
                                break;

                            case SettingsItem.TYPE_PER_SUBSCRIPTION_SETTINGS:
                                UIIntents.get().launchPerSubscriptionSettingsActivity(getActivity(),
                                        item.getSubId(), item.getActivityTitle());
                                break;

                            default:
                                Assert.fail("unrecognized setting type!");
                                break;
                        }
                    }
                });
                return itemView;
            }
        }
    }
}