/*
 * Copyright (C) 2006 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.phone;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.AsyncResult;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceScreen;
import android.preference.CheckBoxPreference;
import com.android.internal.telephony.Phone;
import com.android.internal.telephony.PhoneFactory;

/**
 * List of Phone-specific settings screens.
 */
public class Settings extends PreferenceActivity implements DialogInterface.OnClickListener,
        DialogInterface.OnDismissListener {

    //String keys for preference lookup
    private static final String BUTTON_ROAMING_KEY = "button_roaming_key";
    private static final String BUTTON_PREFER_2G_KEY = "button_prefer_2g_key";
    
    //UI objects
    private CheckBoxPreference mButtonDataRoam;
    private CheckBoxPreference mButtonPrefer2g;
    
    private Phone mPhone;
    
    private boolean mOkClicked;
        
    private MyHandler mHandler;
    
    //This is a method implemented for DialogInterface.OnClickListener.
    //  Used to dismiss the dialogs when they come up.
    public void onClick(DialogInterface dialog, int which) {
        if (which == DialogInterface.BUTTON1) {
            mPhone.setDataRoamingEnabled(true);
            mOkClicked = true;
        } else {
            // Reset the toggle
            mButtonDataRoam.setChecked(false);
        }
    }
    
    public void onDismiss(DialogInterface dialog) {
        // Assuming that onClick gets called first
        if (!mOkClicked) {
            mButtonDataRoam.setChecked(false);
        }
    }
    
    /** 
     * Invoked on each preference click in this hierarchy, overrides 
     * PreferenceActivity's implementation.  Used to make sure we track the
     * preference click events.
     */
    @Override
    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
        if (preference == mButtonDataRoam) {
            //normally called on the toggle click
            if (mButtonDataRoam.isChecked()) {
                // First confirm with a warning dialog about charges
                mOkClicked = false;
                new AlertDialog.Builder(this).setMessage(
                        getResources().getString(R.string.roaming_warning))
                        .setTitle(android.R.string.dialog_alert_title)
                        .setIcon(android.R.drawable.ic_dialog_alert)
                        .setPositiveButton(android.R.string.yes, this)
                        .setNegativeButton(android.R.string.no, this)
                        .show()
                        .setOnDismissListener(this);
            } else {
                mPhone.setDataRoamingEnabled(false);
            }
            return true;
        } else if (preference == mButtonPrefer2g) {
            int networkType = mButtonPrefer2g.isChecked() ? Phone.NT_GSM_TYPE : Phone.NT_AUTO_TYPE;
            mPhone.setPreferredNetworkType(networkType, mHandler
                    .obtainMessage(MyHandler.MESSAGE_SET_PREFERRED_NETWORK_TYPE));
            return true;
        } else {
            // if the button is anything but the simple toggle preference,
            // we'll need to disable all preferences to reject all click
            // events until the sub-activity's UI comes up.
            preferenceScreen.setEnabled(false);
            // Let the intents be launched by the Preference manager
            return false;
        }
    }
    
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        addPreferencesFromResource(R.xml.network_setting);
        
        mPhone = PhoneFactory.getDefaultPhone();
        mHandler = new MyHandler();

        //get UI object references
        PreferenceScreen prefSet = getPreferenceScreen();

        mButtonDataRoam = (CheckBoxPreference) prefSet.findPreference(BUTTON_ROAMING_KEY);
        mButtonPrefer2g = (CheckBoxPreference) prefSet.findPreference(BUTTON_PREFER_2G_KEY);
        
        // The intent code that resided here in the past has been moved into the
        // more conventional location in network_setting.xml
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        // upon resumption from the sub-activity, make sure we re-enable the
        // preferences.
        getPreferenceScreen().setEnabled(true);
        
        // Set UI state in onResume because a user could go home, launch some
        // app to change this setting's backend, and re-launch this settings app
        // and the UI state would be inconsistent with actual state
        mButtonDataRoam.setChecked(mPhone.getDataRoamingEnabled());

        // Get the state for 'prefer 2g' setting
        mPhone.getPreferredNetworkType(mHandler.obtainMessage(MyHandler.MESSAGE_GET_PREFERRED_NETWORK_TYPE));
    }
    
    private class MyHandler extends Handler {

        private static final int MESSAGE_GET_PREFERRED_NETWORK_TYPE = 0;
        private static final int MESSAGE_SET_PREFERRED_NETWORK_TYPE = 1;
        
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MESSAGE_GET_PREFERRED_NETWORK_TYPE:
                    handleGetPreferredNetworkTypeResponse(msg);
                    break;
                    
                case MESSAGE_SET_PREFERRED_NETWORK_TYPE:
                    handleSetPreferredNetworkTypeResponse(msg);
                    break;
            }
        }
        
        private void handleGetPreferredNetworkTypeResponse(Message msg) {
            AsyncResult ar = (AsyncResult) msg.obj;
            
            if (ar.exception == null) {
                int type = ((int[])ar.result)[0];
                mButtonPrefer2g.setChecked(type == Phone.NT_GSM_TYPE);
                
            } else {
                // Weird state, disable the setting
                mButtonPrefer2g.setEnabled(false);
            }
        }

        private void handleSetPreferredNetworkTypeResponse(Message msg) {
            AsyncResult ar = (AsyncResult) msg.obj;

            if (ar.exception != null) {
                // Yikes, error, disable the setting
                mButtonPrefer2g.setEnabled(false);
                // Set UI to current state
                mPhone.getPreferredNetworkType(obtainMessage(MESSAGE_GET_PREFERRED_NETWORK_TYPE));
            }
        }
    }
    
}