/*
 * Copyright (C) 2018 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.car.settings.wifi;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.text.TextUtils;
import android.widget.Toast;

import androidx.annotation.VisibleForTesting;
import androidx.annotation.XmlRes;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;

import com.android.car.settings.R;
import com.android.car.settings.common.Logger;
import com.android.car.settings.common.SettingsFragment;
import com.android.car.ui.toolbar.MenuItem;
import com.android.wifitrackerlib.WifiEntry;

import java.util.Collections;
import java.util.List;

/**
 * Adds a hidden wifi network. The connect button on the fragment is only used for unsecure hidden
 * networks. The remaining security types can be connected via pressing connect on the password
 * dialog.
 */
public class AddWifiFragment extends SettingsFragment {
    private static final Logger LOG = new Logger(AddWifiFragment.class);
    private static final String KEY_NETWORK_NAME = "network_name";
    private static final String KEY_SECURITY_TYPE = "security_type";

    @VisibleForTesting
    final BroadcastReceiver mNameChangeReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            mNetworkName = intent.getStringExtra(
                    NetworkNamePreferenceController.KEY_NETWORK_NAME);
            setButtonEnabledState();
        }
    };

    @VisibleForTesting
    final BroadcastReceiver mSecurityChangeReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            mSecurityType = intent.getIntExtra(
                    NetworkSecurityPreferenceController.KEY_SECURITY_TYPE,
                    WifiEntry.SECURITY_NONE);
            setButtonEnabledState();
        }
    };

    private final Handler mUiHandler = new Handler(Looper.getMainLooper());
    private final WifiManager.ActionListener mConnectionListener =
            new WifiManager.ActionListener() {
                @Override
                public void onSuccess() {
                    LOG.d("connected to network");
                    mUiHandler.post(() -> goBack());
                }

                @Override
                public void onFailure(int reason) {
                    LOG.d("Failed to connect to network. Failure code: " + reason);
                    Toast.makeText(getContext(), R.string.wifi_failed_connect_message,
                            Toast.LENGTH_SHORT).show();
                }
            };

    private MenuItem mAddWifiButton;
    private String mNetworkName;
    private int mSecurityType = WifiEntry.SECURITY_NONE;

    @Override
    public List<MenuItem> getToolbarMenuItems() {
        return Collections.singletonList(mAddWifiButton);
    }

    @Override
    @XmlRes
    protected int getPreferenceScreenResId() {
        return R.xml.add_wifi_fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState != null) {
            mNetworkName = savedInstanceState.getString(KEY_NETWORK_NAME);
            mSecurityType = savedInstanceState.getInt(KEY_SECURITY_TYPE, WifiEntry.SECURITY_NONE);
        }

        mAddWifiButton = new MenuItem.Builder(getContext())
                .setTitle(R.string.wifi_setup_connect)
                .setOnClickListener(i -> {
                    // This only needs to handle hidden/unsecure networks.
                    WifiUtil.connectToWifiEntry(getContext(), mNetworkName,
                            mSecurityType, /* password= */ null, /* hidden= */ true,
                            mConnectionListener);
                })
                .build();
        LocalBroadcastManager.getInstance(getContext()).registerReceiver(mNameChangeReceiver,
                new IntentFilter(NetworkNamePreferenceController.ACTION_NAME_CHANGE));
        LocalBroadcastManager.getInstance(getContext()).registerReceiver(mSecurityChangeReceiver,
                new IntentFilter(NetworkSecurityPreferenceController.ACTION_SECURITY_CHANGE));
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        LocalBroadcastManager.getInstance(getContext()).unregisterReceiver(mNameChangeReceiver);
        LocalBroadcastManager.getInstance(getContext()).unregisterReceiver(mSecurityChangeReceiver);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString(KEY_NETWORK_NAME, mNetworkName);
        outState.putInt(KEY_SECURITY_TYPE, mSecurityType);
    }

    @Override
    public void onStart() {
        super.onStart();
        setButtonEnabledState();
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mAddWifiButton != null) {
            mAddWifiButton.setEnabled(false);
        }
    }

    private void setButtonEnabledState() {
        if (mAddWifiButton != null) {
            mAddWifiButton.setEnabled(
                    !TextUtils.isEmpty(mNetworkName) && WifiUtil.isOpenNetwork(mSecurityType));
        }
    }
}