/*
 * 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.settings.R;
import com.android.settings.SettingsPreferenceFragment;
import com.android.settings.Utils;
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.NotificationChannelGroup;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.Settings;
import android.support.v7.preference.Preference;
import android.text.TextUtils;
import android.util.ArrayMap;
import android.util.Log;
import android.widget.Toast;

import static com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;

import java.util.List;

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

    private static final Intent APP_NOTIFICATION_PREFS_CATEGORY_INTENT
            = new Intent(Intent.ACTION_MAIN)
            .addCategory(Notification.INTENT_CATEGORY_NOTIFICATION_PREFERENCES);

    protected static final String KEY_BLOCK = "block";
    protected static final String KEY_BADGE = "badge";

    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 < 0) {
            try {
                mUid = mPm.getPackageUid(mPkg, 0);
            } catch (NameNotFoundException e) {
            }
        }

        mPkgInfo = findPackageInfo(mPkg, mUid);

        if (mUid < 0 || TextUtils.isEmpty(mPkg) || mPkgInfo == null) {
            Log.w(TAG, "Missing package or uid or packageinfo");
            toastAndFinish();
            return;
        }

        mUserId = UserHandle.getUserId(mUid);
        mAppRow = mBackend.loadAppRow(mContext, mPm, mPkgInfo);
        mChannel = (args != null && args.containsKey(Settings.EXTRA_CHANNEL_ID)) ?
                mBackend.getChannel(mPkg, mUid, args.getString(Settings.EXTRA_CHANNEL_ID)) : 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 < 0 || TextUtils.isEmpty(mPkg) || mPkgInfo == null) {
            Log.w(TAG, "Missing package or uid or packageinfo");
            finish();
            return;
        }
        mSuspendedAppsAdmin = RestrictedLockUtils.checkIfApplicationIsSuspended(
                mContext, mPkg, mUserId);
        mBlock.setDisabledByAdmin(mSuspendedAppsAdmin);
        mBadge.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 List<ResolveInfo> queryNotificationConfigActivities() {
        if (DEBUG) Log.d(TAG, "APP_NOTIFICATION_PREFS_CATEGORY_INTENT is "
                + APP_NOTIFICATION_PREFS_CATEGORY_INTENT);
        final List<ResolveInfo> resolveInfos = mPm.queryIntentActivities(
                APP_NOTIFICATION_PREFS_CATEGORY_INTENT,
                0 //PackageManager.MATCH_DEFAULT_ONLY
        );
        return resolveInfos;
    }

    protected void collectConfigActivities(ArrayMap<String, NotificationBackend.AppRow> rows) {
        final List<ResolveInfo> resolveInfos = queryNotificationConfigActivities();
        applyConfigActivities(rows, resolveInfos);
    }

    private void applyConfigActivities(ArrayMap<String, NotificationBackend.AppRow> rows,
            List<ResolveInfo> resolveInfos) {
        if (DEBUG) Log.d(TAG, "Found " + resolveInfos.size() + " preference activities"
                + (resolveInfos.size() == 0 ? " ;_;" : ""));
        for (ResolveInfo ri : resolveInfos) {
            final ActivityInfo activityInfo = ri.activityInfo;
            final ApplicationInfo appInfo = activityInfo.applicationInfo;
            final NotificationBackend.AppRow row = rows.get(appInfo.packageName);
            if (row == null) {
                if (DEBUG) Log.v(TAG, "Ignoring notification preference activity ("
                        + activityInfo.name + ") for unknown package "
                        + activityInfo.packageName);
                continue;
            }
            if (row.settingsIntent != null) {
                if (DEBUG) Log.v(TAG, "Ignoring duplicate notification preference activity ("
                        + activityInfo.name + ") for package "
                        + activityInfo.packageName);
                continue;
            }
            row.settingsIntent = new Intent(APP_NOTIFICATION_PREFS_CATEGORY_INTENT)
                    .setClassName(activityInfo.packageName, activityInfo.name);
            if (mChannel != null) {
                row.settingsIntent.putExtra(Notification.EXTRA_CHANNEL_ID, mChannel.getId());
            }
        }
    }

    private PackageInfo findPackageInfo(String pkg, int uid) {
        if (pkg == null || uid < 0) {
            return null;
        }
        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;
    }

    protected String getImportanceSummary(int importance) {
        switch (importance) {
            case NotificationManager.IMPORTANCE_UNSPECIFIED:
                return getContext().getString(R.string.notification_importance_unspecified);
            case NotificationManager.IMPORTANCE_NONE:
                return getContext().getString(R.string.notification_importance_blocked);
            case NotificationManager.IMPORTANCE_MIN:
                return getContext().getString(R.string.notification_importance_min);
            case NotificationManager.IMPORTANCE_LOW:
                return getContext().getString(R.string.notification_importance_low);
            case NotificationManager.IMPORTANCE_DEFAULT:
                return getContext().getString(R.string.notification_importance_default);
            case NotificationManager.IMPORTANCE_HIGH:
            case NotificationManager.IMPORTANCE_MAX:
            default:
                return getContext().getString(R.string.notification_importance_high);
        }
    }

    protected CharSequence getNotificationGroupLabel(NotificationChannelGroup group) {
        return getLabel(group.getName(), group.getNameResId());
    }

    protected CharSequence getNotificationChannelLabel(NotificationChannel channel) {
        return getLabel(channel.getName(), channel.getNameResId());
    }

    private CharSequence getLabel(CharSequence name, int nameResId) {
        if (!TextUtils.isEmpty(name)) {
            return name;
        }
        try {
            ApplicationInfo info = mPm.getApplicationInfoAsUser(mAppRow.pkg, 0, mAppRow.userId);
            return mPm.getText(mAppRow.pkg, nameResId, info);
        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }
}