/*
 * Copyright (C) 2013 The CyanogenMod 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.cyanogenmod.setupwizard.setup;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Context;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.ServiceState;
import android.telephony.SignalStrength;
import android.telephony.SubscriptionManager;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.view.View;
import android.widget.ImageView;
import android.widget.Switch;
import android.widget.TextView;

import com.cyanogenmod.setupwizard.R;
import com.cyanogenmod.setupwizard.ui.SetupPageFragment;
import com.cyanogenmod.setupwizard.util.SetupWizardUtils;

public class MobileDataPage extends SetupPage {

    public static final String TAG = "MobileDataPage";

    public MobileDataPage(Context context, SetupDataCallbacks callbacks) {
        super(context, callbacks);
    }

    @Override
    public Fragment getFragment(FragmentManager fragmentManager, int action) {
        Fragment fragment = fragmentManager.findFragmentByTag(getKey());
        if (fragment == null) {
            Bundle args = new Bundle();
            args.putString(Page.KEY_PAGE_ARGUMENT, getKey());
            args.putInt(Page.KEY_PAGE_ACTION, action);
            fragment = new MobileDataFragment();
            fragment.setArguments(args);
        }
        return fragment;
    }

    @Override
    public String getKey() {
        return TAG;
    }

    @Override
    public int getTitleResId() {
        return R.string.setup_mobile_data;
    }

    public static class MobileDataFragment extends SetupPageFragment {

        private View mEnableDataRow;
        private Switch mEnableMobileData;
        private ImageView mSignalView;
        private TextView mNameView;

        private TelephonyManager mPhone;
        private SignalStrength mSignalStrength;
        private ServiceState mServiceState;

        private PhoneStateListener mPhoneStateListener =
                new PhoneStateListener(SubscriptionManager.getDefaultDataSubId()) {

            @Override
            public void onSignalStrengthsChanged(SignalStrength signalStrength) {
                if (isDetached()) return;
                mSignalStrength = signalStrength;
                updateSignalStrength();
            }

            @Override
            public void onServiceStateChanged(ServiceState state) {
                if (isDetached()) return;
                mServiceState = state;
                updateSignalStrength();
            }

        };

        private View.OnClickListener mEnableDataClickListener = new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                boolean checked = !mEnableMobileData.isChecked();
                SetupWizardUtils.setMobileDataEnabled(getActivity(), checked);
                mEnableMobileData.setChecked(checked);
            }
        };

        @Override
        protected void initializePage() {
            mEnableDataRow = mRootView.findViewById(R.id.data);
            mEnableDataRow.setOnClickListener(mEnableDataClickListener);
            mEnableMobileData = (Switch) mRootView.findViewById(R.id.data_switch);
            mSignalView =  (ImageView) mRootView.findViewById(R.id.signal);
            mNameView =  (TextView) mRootView.findViewById(R.id.enable_data_title);
            updateDataConnectionStatus();
            updateSignalStrength();
        }

        @Override
        protected int getLayoutResource() {
            return R.layout.mobile_data_settings;
        }

        @Override
        public void onResume() {
            super.onResume();
            updateDataConnectionStatus();
            updateSignalStrength();
        }

        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);
            mPhone = (TelephonyManager)getActivity().getSystemService(Context.TELEPHONY_SERVICE);
            mPhone.listen(mPhoneStateListener,
                    PhoneStateListener.LISTEN_SERVICE_STATE
                            | PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
        }

        @Override
        public void onDetach() {
            mPhone.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);
            super.onDetach();
        }

        private void updateCarrierText() {
            if (isDetached()) return;
            String name = mPhone.getNetworkOperatorName(SubscriptionManager.getDefaultDataSubId());
            if (TextUtils.isEmpty(name)) {
                if (mServiceState != null && mServiceState.isEmergencyOnly()) {
                    name = getString(R.string.setup_mobile_data_emergency_only);
                } else {
                    name = getString(R.string.setup_mobile_data_no_service);
                }
            }
            mNameView.setText(name);
        }

        private void updateSignalStrength() {
            if (isDetached()) return;
            if (!hasService()) {
                mSignalView.setImageResource(R.drawable.ic_signal_no_signal);
            } else {
                if (mSignalStrength != null) {
                    int resId;
                    switch (mSignalStrength.getLevel()) {
                        case 4:
                            resId = R.drawable.ic_signal_4;
                            break;
                        case 3:
                            resId = R.drawable.ic_signal_3;
                            break;
                        case 2:
                            resId = R.drawable.ic_signal_2;
                            break;
                        case 1:
                            resId = R.drawable.ic_signal_1;
                            break;
                        default:
                            resId = R.drawable.ic_signal_0;
                            break;
                    }
                    mSignalView.setImageResource(resId);
                }
            }
            updateCarrierText();
        }

        private void updateDataConnectionStatus() {
            mEnableMobileData.setChecked(SetupWizardUtils.isMobileDataEnabled(getActivity()));
        }

        private boolean hasService() {
            boolean retVal;
            if (mServiceState != null) {
                // Consider the device to be in service if either voice or data service is available.
                // Some SIM cards are marketed as data-only and do not support voice service, and on
                // these SIM cards, we want to show signal bars for data service as well as the "no
                // service" or "emergency calls only" text that indicates that voice is not available.
                switch(mServiceState.getVoiceRegState()) {
                    case ServiceState.STATE_POWER_OFF:
                        retVal = false;
                        break;
                    case ServiceState.STATE_OUT_OF_SERVICE:
                    case ServiceState.STATE_EMERGENCY_ONLY:
                        retVal = mServiceState.getDataRegState() == ServiceState.STATE_IN_SERVICE;
                        break;
                    default:
                        retVal = true;
                }
            } else {
                retVal = false;
            }
            return retVal;
        }

    }
}