/**
 * Copyright (C) 2013 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.applications;

import android.app.Activity;
import android.app.AppOpsManager;
import android.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.PermissionGroupInfo;
import android.content.pm.PermissionInfo;
import android.content.res.Resources;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Switch;
import android.widget.TextView;

import com.android.settings.R;
import com.android.settings.Utils;

import java.util.List;

public class AppOpsDetails extends Fragment {
    static final String TAG = "AppOpsDetails";

    public static final String ARG_PACKAGE_NAME = "package";

    private AppOpsState mState;
    private PackageManager mPm;
    private AppOpsManager mAppOps;
    private PackageInfo mPackageInfo;
    private LayoutInflater mInflater;
    private View mRootView;
    private TextView mAppVersion;
    private LinearLayout mOperationsSection;

    // Utility method to set application label and icon.
    private void setAppLabelAndIcon(PackageInfo pkgInfo) {
        final View appSnippet = mRootView.findViewById(R.id.app_snippet);
        appSnippet.setPaddingRelative(0, appSnippet.getPaddingTop(), 0, appSnippet.getPaddingBottom());

        ImageView icon = (ImageView) appSnippet.findViewById(R.id.app_icon);
        icon.setImageDrawable(mPm.getApplicationIcon(pkgInfo.applicationInfo));
        // Set application name.
        TextView label = (TextView) appSnippet.findViewById(R.id.app_name);
        label.setText(mPm.getApplicationLabel(pkgInfo.applicationInfo));
        // Version number of application
        mAppVersion = (TextView) appSnippet.findViewById(R.id.app_size);

        if (pkgInfo.versionName != null) {
            mAppVersion.setVisibility(View.VISIBLE);
            mAppVersion.setText(getActivity().getString(R.string.version_text,
                    String.valueOf(pkgInfo.versionName)));
        } else {
            mAppVersion.setVisibility(View.INVISIBLE);
        }
    }

    private String retrieveAppEntry() {
        final Bundle args = getArguments();
        String packageName = (args != null) ? args.getString(ARG_PACKAGE_NAME) : null;
        if (packageName == null) {
            Intent intent = (args == null) ?
                    getActivity().getIntent() : (Intent) args.getParcelable("intent");
            if (intent != null) {
                packageName = intent.getData().getSchemeSpecificPart();
            }
        }
        try {
            mPackageInfo = mPm.getPackageInfo(packageName,
                    PackageManager.GET_DISABLED_COMPONENTS |
                    PackageManager.GET_UNINSTALLED_PACKAGES);
        } catch (NameNotFoundException e) {
            Log.e(TAG, "Exception when retrieving package:" + packageName, e);
            mPackageInfo = null;
        }

        return packageName;
    }

    private boolean refreshUi() {
        if (mPackageInfo == null) {
            return false;
        }

        setAppLabelAndIcon(mPackageInfo);

        Resources res = getActivity().getResources();

        mOperationsSection.removeAllViews();
        String lastPermGroup = "";
        for (AppOpsState.OpsTemplate tpl : AppOpsState.ALL_TEMPLATES) {
            List<AppOpsState.AppOpEntry> entries = mState.buildState(tpl,
                    mPackageInfo.applicationInfo.uid, mPackageInfo.packageName);
            for (final AppOpsState.AppOpEntry entry : entries) {
                for (int i=0; i<entry.getNumOpEntry(); i++) {
                    final AppOpsManager.OpEntry op = entry.getOpEntry(i);
                    final View view = mInflater.inflate(R.layout.app_ops_details_item,
                            mOperationsSection, false);
                    mOperationsSection.addView(view);
                    String perm = AppOpsManager.opToPermission(op.getOp());
                    if (perm != null) {
                        try {
                            PermissionInfo pi = mPm.getPermissionInfo(perm, 0);
                            if (pi.group != null && !lastPermGroup.equals(pi.group)) {
                                lastPermGroup = pi.group;
                                PermissionGroupInfo pgi = mPm.getPermissionGroupInfo(pi.group, 0);
                                if (pgi.icon != 0) {
                                    ((ImageView)view.findViewById(R.id.op_icon)).setImageDrawable(
                                            pgi.loadIcon(mPm));
                                }
                            }
                        } catch (NameNotFoundException e) {
                        }
                    }
                    ((TextView)view.findViewById(R.id.op_name)).setText(mState.getLabelText(op));
                    ((TextView)view.findViewById(R.id.op_time)).setText(mState.getTimeText(op));
                    Switch sw = (Switch)view.findViewById(R.id.switchWidget);
                    sw.setChecked(op.getMode() == AppOpsManager.MODE_ALLOWED);
                    sw.setOnCheckedChangeListener(new Switch.OnCheckedChangeListener() {
                        @Override
                        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                            mAppOps.setMode(op.getOp(), entry.getPackageOps().getUid(),
                                    entry.getPackageOps().getPackageName(), isChecked
                                    ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_IGNORED);
                        }
                    });
                }
            }
        }

        return true;
    }

    private void setIntentAndFinish(boolean finish, boolean appChanged) {
        Intent intent = new Intent();
        intent.putExtra(ManageApplications.APP_CHG, appChanged);
        PreferenceActivity pa = (PreferenceActivity)getActivity();
        pa.finishPreferencePanel(this, Activity.RESULT_OK, intent);
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        mState = new AppOpsState(getActivity());
        mPm = getActivity().getPackageManager();
        mInflater = (LayoutInflater)getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mAppOps = (AppOpsManager)getActivity().getSystemService(Context.APP_OPS_SERVICE);

        retrieveAppEntry();

        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(
            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        final View view = inflater.inflate(R.layout.app_ops_details, container, false);
        Utils.prepareCustomPreferencesList(container, view, view, false);

        mRootView = view;
        mOperationsSection = (LinearLayout)view.findViewById(R.id.operations_section);
        return view;
    }

    @Override
    public void onResume() {
        super.onResume();
        if (!refreshUi()) {
            setIntentAndFinish(true, true);
        }
    }
}