/*
 * Copyright (C) 2010 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.settings;

import org.xmlpull.v1.XmlPullParserException;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.admin.DeviceAdminInfo;
import android.app.admin.DeviceAdminReceiver;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.Resources;
import android.os.Bundle;
import android.os.Handler;
import android.os.RemoteCallback;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AppSecurityPermissions;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import java.io.IOException;
import java.util.ArrayList;

public class DeviceAdminAdd extends Activity {
    static final String TAG = "DeviceAdminAdd";
    
    static final int DIALOG_WARNING = 1;
    
    Handler mHandler;
    
    DevicePolicyManager mDPM;
    DeviceAdminInfo mDeviceAdmin;
    CharSequence mAddMsgText;
    
    TextView mTitle;
    ImageView mAdminIcon;
    TextView mAdminName;
    TextView mAdminDescription;
    TextView mAddMsg;
    TextView mAdminWarning;
    ViewGroup mAdminPolicies;
    Button mActionButton;
    Button mCancelButton;
    
    View mSelectLayout;
    
    final ArrayList<View> mAddingPolicies = new ArrayList<View>();
    final ArrayList<View> mActivePolicies = new ArrayList<View>();
    
    boolean mAdding;
    
    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        mHandler = new Handler(getMainLooper());
        
        mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);

        if ((getIntent().getFlags()&Intent.FLAG_ACTIVITY_NEW_TASK) != 0) {
            Log.w(TAG, "Can now start ADD_DEVICE_ADMIN as a new task");
            finish();
            return;
        }
        
        ComponentName cn = (ComponentName)getIntent().getParcelableExtra(
                DevicePolicyManager.EXTRA_DEVICE_ADMIN);
        if (cn == null) {
            Log.w(TAG, "No component specified in " + getIntent().getAction());
            finish();
            return;
        }
        if (DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN.equals(getIntent().getAction())) {
            // If this was an add request, then just exit immediately if the
            // given component is already added.
            if (mDPM.isAdminActive(cn)) {
                setResult(Activity.RESULT_OK);
                finish();
                return;
            }
        }
        
        ActivityInfo ai;
        try {
            ai = getPackageManager().getReceiverInfo(cn,
                    PackageManager.GET_META_DATA);
        } catch (PackageManager.NameNotFoundException e) {
            Log.w(TAG, "Unable to retrieve device policy " + cn, e);
            finish();
            return;
        }
        
        ResolveInfo ri = new ResolveInfo();
        ri.activityInfo = ai;
        try {
            mDeviceAdmin= new DeviceAdminInfo(this, ri);
        } catch (XmlPullParserException e) {
            Log.w(TAG, "Unable to retrieve device policy " + cn, e);
            finish();
            return;
        } catch (IOException e) {
            Log.w(TAG, "Unable to retrieve device policy " + cn, e);
            finish();
            return;
        }
        
        mAddMsgText = getIntent().getCharSequenceExtra(
                DevicePolicyManager.EXTRA_ADD_EXPLANATION);
        
        setContentView(R.layout.device_admin_add);
        
        mTitle = (TextView)findViewById(R.id.title);
        mAdminIcon = (ImageView)findViewById(R.id.admin_icon);
        mAdminName = (TextView)findViewById(R.id.admin_name);
        mAdminDescription = (TextView)findViewById(R.id.admin_description);
        mAddMsg = (TextView)findViewById(R.id.add_msg);
        mAdminWarning = (TextView)findViewById(R.id.admin_warning);
        mAdminPolicies = (ViewGroup)findViewById(R.id.admin_policies);
        mCancelButton = (Button)findViewById(R.id.cancel_button);
        mCancelButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                finish();
            }
        });
        mActionButton = (Button)findViewById(R.id.action_button);
        mActionButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (mAdding) {
                    try {
                        mDPM.setActiveAdmin(mDeviceAdmin.getComponent());
                        setResult(Activity.RESULT_OK);
                    } catch (RuntimeException e) {
                        // Something bad happened...  could be that it was
                        // already set, though.
                        Log.w(TAG, "Exception trying to activate admin "
                                + mDeviceAdmin.getComponent(), e);
                        if (mDPM.isAdminActive(mDeviceAdmin.getComponent())) {
                            setResult(Activity.RESULT_OK);
                        }
                    }
                    finish();
                } else {
                    mDPM.getRemoveWarning(mDeviceAdmin.getComponent(),
                            new RemoteCallback(mHandler) {
                        @Override
                        protected void onResult(Bundle bundle) {
                            CharSequence msg = bundle != null
                                    ? bundle.getCharSequence(
                                            DeviceAdminReceiver.EXTRA_DISABLE_WARNING)
                                    : null;
                            if (msg == null) {
                                mDPM.removeActiveAdmin(mDeviceAdmin.getComponent());
                                finish();
                            } else {
                                Bundle args = new Bundle();
                                args.putCharSequence(
                                        DeviceAdminReceiver.EXTRA_DISABLE_WARNING, msg);
                                showDialog(DIALOG_WARNING, args);
                            }
                        }
                    });
                }
            }
        });
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        updateInterface();
    }
    
    @Override
    protected Dialog onCreateDialog(int id, Bundle args) {
        switch (id) {
            case DIALOG_WARNING: {
                CharSequence msg = args.getCharSequence(DeviceAdminReceiver.EXTRA_DISABLE_WARNING);
                AlertDialog.Builder builder = new AlertDialog.Builder(
                        DeviceAdminAdd.this);
                builder.setMessage(msg);
                builder.setPositiveButton(R.string.dlg_ok,
                        new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        mDPM.removeActiveAdmin(mDeviceAdmin.getComponent());
                        finish();
                    }
                });
                builder.setNegativeButton(R.string.dlg_cancel, null);
                return builder.create();
            }
            default:
                return super.onCreateDialog(id, args);
                    
        }
    }
    
    static void setViewVisibility(ArrayList<View> views, int visibility) {
        final int N = views.size();
        for (int i=0; i<N; i++) {
            views.get(i).setVisibility(visibility);
        }
    }
    
    void updateInterface() {
        mAdminIcon.setImageDrawable(mDeviceAdmin.loadIcon(getPackageManager()));
        mAdminName.setText(mDeviceAdmin.loadLabel(getPackageManager()));
        try {
            mAdminDescription.setText(
                    mDeviceAdmin.loadDescription(getPackageManager()));
            mAdminDescription.setVisibility(View.VISIBLE);
        } catch (Resources.NotFoundException e) {
            mAdminDescription.setVisibility(View.GONE);
        }
        if (mAddMsgText != null) {
            mAddMsg.setText(mAddMsgText);
            mAddMsg.setVisibility(View.VISIBLE);
        } else {
            mAddMsg.setVisibility(View.GONE);
        }
        if (mDPM.isAdminActive(mDeviceAdmin.getComponent())) {
            if (mActivePolicies.size() == 0) {
                ArrayList<DeviceAdminInfo.PolicyInfo> policies = mDeviceAdmin.getUsedPolicies();
                for (int i=0; i<policies.size(); i++) {
                    DeviceAdminInfo.PolicyInfo pi = policies.get(i);
                    View view = AppSecurityPermissions.getPermissionItemView(
                            this, getText(pi.label), "", true);
                    mActivePolicies.add(view);
                    mAdminPolicies.addView(view);
                }
            }
            setViewVisibility(mActivePolicies, View.VISIBLE);
            setViewVisibility(mAddingPolicies, View.GONE);
            mAdminWarning.setText(getString(R.string.device_admin_status,
                    mDeviceAdmin.getActivityInfo().applicationInfo.loadLabel(getPackageManager())));
            mTitle.setText(getText(R.string.active_device_admin_msg));
            mActionButton.setText(getText(R.string.remove_device_admin));
            mAdding = false;
        } else {
            if (mAddingPolicies.size() == 0) {
                ArrayList<DeviceAdminInfo.PolicyInfo> policies = mDeviceAdmin.getUsedPolicies();
                for (int i=0; i<policies.size(); i++) {
                    DeviceAdminInfo.PolicyInfo pi = policies.get(i);
                    View view = AppSecurityPermissions.getPermissionItemView(
                            this, getText(pi.label), getText(pi.description), true);
                    mAddingPolicies.add(view);
                    mAdminPolicies.addView(view);
                }
            }
            setViewVisibility(mAddingPolicies, View.VISIBLE);
            setViewVisibility(mActivePolicies, View.GONE);
            mAdminWarning.setText(getString(R.string.device_admin_warning,
                    mDeviceAdmin.getActivityInfo().applicationInfo.loadLabel(getPackageManager())));
            mTitle.setText(getText(R.string.add_device_admin_msg));
            mActionButton.setText(getText(R.string.add_device_admin));
            mAdding = true;
        }
    }
    
}