/*
 * Copyright (C) 2016 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.notification;

import com.android.internal.widget.LockPatternUtils;
import com.android.settings.R;
import com.android.settings.SettingsPreferenceFragment;
import com.android.settings.applications.AppInfoBase;
import com.android.settingslib.RestrictedLockUtils;
import com.android.settingslib.RestrictedSwitchPreference;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.admin.DevicePolicyManager;
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.UserInfo;
import android.os.Bundle;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.Settings;
import android.service.notification.NotificationListenerService.Ranking;
import android.support.v7.preference.Preference;
import android.text.TextUtils;
import android.util.Log;
import android.widget.Toast;

import java.util.ArrayList;

import static com.android.settings.notification.RestrictedDropDownPreference.RestrictedItem;
import static com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;

abstract public class NotificationSettingsBase extends SettingsPreferenceFragment {
    private static final String TAG = "NotifiSettingsBase";
    private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);

    protected static final String ARG_CHANNEL = "channel";

    protected static final String KEY_BLOCK = "block";

    protected PackageManager mPm;
    protected UserManager mUm;
    protected final NotificationBackend mBackend = new NotificationBackend();
    protected Context mContext;
    protected boolean mCreated;
    protected int mUid;
    protected int mUserId;
    protected String mPkg;
    protected PackageInfo mPkgInfo;
    protected RestrictedSwitchPreference mBlock;
    protected RestrictedSwitchPreference mBadge;
    protected EnforcedAdmin mSuspendedAppsAdmin;
    protected boolean mDndVisualEffectsSuppressed;

    protected NotificationChannel mChannel;
    protected NotificationBackend.AppRow mAppRow;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if (DEBUG) Log.d(TAG, "onActivityCreated mCreated=" + mCreated);
        if (mCreated) {
            Log.w(TAG, "onActivityCreated: ignoring duplicate call");
            return;
        }
        mCreated = true;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContext = getActivity();
        Intent intent = getActivity().getIntent();
        Bundle args = getArguments();
        if (DEBUG) Log.d(TAG, "onCreate getIntent()=" + intent);
        if (intent == null && args == null) {
            Log.w(TAG, "No intent");
            toastAndFinish();
            return;
        }

        mPm = getPackageManager();
        mUm = (UserManager) mContext.getSystemService(Context.USER_SERVICE);

        mPkg = args != null && args.containsKey(AppInfoBase.ARG_PACKAGE_NAME)
                ? args.getString(AppInfoBase.ARG_PACKAGE_NAME)
                : intent.getStringExtra(Settings.EXTRA_APP_PACKAGE);
        mUid = args != null && args.containsKey(AppInfoBase.ARG_PACKAGE_UID)
                ? args.getInt(AppInfoBase.ARG_PACKAGE_UID)
                : intent.getIntExtra(Settings.EXTRA_APP_UID, -1);
        if (mUid == -1 || TextUtils.isEmpty(mPkg)) {
            Log.w(TAG, "Missing extras: " + Settings.EXTRA_APP_PACKAGE + " was " + mPkg + ", "
                    + Settings.EXTRA_APP_UID + " was " + mUid);
            toastAndFinish();
            return;
        }
        mUserId = UserHandle.getUserId(mUid);

        if (DEBUG) Log.d(TAG, "Load details for pkg=" + mPkg + " uid=" + mUid);
        mPkgInfo = findPackageInfo(mPkg, mUid);
        if (mPkgInfo == null) {
            Log.w(TAG, "Failed to find package info: " + Settings.EXTRA_APP_PACKAGE + " was " + mPkg
                    + ", " + Settings.EXTRA_APP_UID + " was " + mUid);
            toastAndFinish();
            return;
        }

        mAppRow = mBackend.loadAppRow(mContext, mPm, mPkgInfo);
        mChannel = (args != null && args.containsKey(ARG_CHANNEL)) ?
                mBackend.getChannel(mPkg, mUid, args.getString(ARG_CHANNEL)) : null;

        mSuspendedAppsAdmin = RestrictedLockUtils.checkIfApplicationIsSuspended(
                mContext, mPkg, mUserId);
        NotificationManager.Policy policy =
                NotificationManager.from(mContext).getNotificationPolicy();
        mDndVisualEffectsSuppressed = policy == null ? false : policy.suppressedVisualEffects != 0;
    }

    @Override
    public void onResume() {
        super.onResume();
        if ((mUid != -1 && getPackageManager().getPackagesForUid(mUid) == null)) {
            // App isn't around anymore, must have been removed.
            finish();
            return;
        }
        mSuspendedAppsAdmin = RestrictedLockUtils.checkIfApplicationIsSuspended(
                mContext, mPkg, mUserId);
        mBlock.setDisabledByAdmin(mSuspendedAppsAdmin);
    }

    protected void setVisible(Preference p, boolean visible) {
        final boolean isVisible = getPreferenceScreen().findPreference(p.getKey()) != null;
        if (isVisible == visible) return;
        if (visible) {
            getPreferenceScreen().addPreference(p);
        } else {
            getPreferenceScreen().removePreference(p);
        }
    }

    protected void toastAndFinish() {
        Toast.makeText(mContext, R.string.app_not_found_dlg_text, Toast.LENGTH_SHORT).show();
        getActivity().finish();
    }

    private PackageInfo findPackageInfo(String pkg, int uid) {
        final String[] packages = mPm.getPackagesForUid(uid);
        if (packages != null && pkg != null) {
            final int N = packages.length;
            for (int i = 0; i < N; i++) {
                final String p = packages[i];
                if (pkg.equals(p)) {
                    try {
                        return mPm.getPackageInfo(pkg, PackageManager.GET_SIGNATURES);
                    } catch (NameNotFoundException e) {
                        Log.w(TAG, "Failed to load package " + pkg, e);
                    }
                }
            }
        }
        return null;
    }
}