/*
 * Copyright (C) 2015 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.car.dialer.telecom;

import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.graphics.Rect;
import android.net.Uri;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.PhoneLookup;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.support.annotation.WorkerThread;
import android.telecom.Call;
import android.telephony.PhoneNumberUtils;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.util.Log;
import android.widget.ImageView;
import com.android.car.apps.common.CircleBitmapDrawable;
import com.android.car.apps.common.LetterTileDrawable;
import com.android.car.dialer.R;

import java.io.InputStream;
import java.util.Locale;

public class TelecomUtils {
    private final static String TAG = "Em.TelecomUtils";

    private static final String[] CONTACT_ID_PROJECTION = new String[] {
            ContactsContract.PhoneLookup.DISPLAY_NAME,
            ContactsContract.PhoneLookup.TYPE,
            ContactsContract.PhoneLookup.LABEL,
            ContactsContract.PhoneLookup._ID
    };

    private static String sVoicemailNumber;
    private static TelephonyManager sTelephonyManager;

    @WorkerThread
    public static Bitmap getContactPhotoFromNumber(ContentResolver contentResolver, String number) {
        if (number == null) {
            return null;
        }

        int id = getContactIdFromNumber(contentResolver, number);
        if (id == 0) {
            return null;
        }
        return getContactPhotoFromId(contentResolver, id);
    }

    /**
     * Return the contact id for the given contact id
     * @param id the contact id to get the photo for
     * @return the contact photo if it is found, null otherwise.
     */
    public static Bitmap getContactPhotoFromId(ContentResolver contentResolver, long id) {
        Uri photoUri = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, id);
        InputStream photoDataStream = ContactsContract.Contacts.openContactPhotoInputStream(
                contentResolver, photoUri, true);

        Options options = new Options();
        options.inPreferQualityOverSpeed = true;
        // Scaling will be handled by later. We shouldn't scale multiple times to avoid
        // quality lost due to multiple potential scaling up and down.
        options.inScaled = false;

        Rect nullPadding = null;
        Bitmap photo = BitmapFactory.decodeStream(photoDataStream, nullPadding, options);
        if (photo != null) {
            photo.setDensity(Bitmap.DENSITY_NONE);
        }
        return photo;
    }

    /**
     * Return the contact id for the given phone number.
     * @param number Caller phone number
     * @return the contact id if it is found, 0 otherwise.
     */
    public static int getContactIdFromNumber(ContentResolver cr, String number) {
        if (number == null || number.isEmpty()) {
            return 0;
        }

        Uri uri = Uri.withAppendedPath(
                ContactsContract.PhoneLookup.CONTENT_FILTER_URI,
                Uri.encode(number));
        Cursor cursor = cr.query(uri, CONTACT_ID_PROJECTION, null, null, null);

        try {
            if (cursor != null && cursor.moveToFirst()) {
                int id = cursor.getInt(cursor.getColumnIndex(ContactsContract.PhoneLookup._ID));
                return id;
            }
        }
        finally {
            if (cursor != null) {
                cursor.close();
            }
        }
        return 0;
    }

    /**
     * Return the label for the given phone number.
     * @param number Caller phone number
     * @return the label if it is found, 0 otherwise.
     */
    public static CharSequence getTypeFromNumber(Context context, String number) {
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "getTypeFromNumber, number: " + number);
        }
        String defaultLabel = "";
        if (number == null || number.isEmpty()) {
            return defaultLabel;
        }

        ContentResolver cr = context.getContentResolver();
        Resources res = context.getResources();
        Uri uri = Uri.withAppendedPath(
                PhoneLookup.CONTENT_FILTER_URI, Uri.encode(number));
        Cursor cursor = cr.query(uri, CONTACT_ID_PROJECTION, null, null, null);

        try {
            if (cursor != null && cursor.moveToFirst()) {
                int typeColumn = cursor.getColumnIndex(PhoneLookup.TYPE);
                int type = cursor.getInt(typeColumn);
                int labelColumn = cursor.getColumnIndex(PhoneLookup.LABEL);
                String label = cursor.getString(labelColumn);
                CharSequence typeLabel =
                        Phone.getTypeLabel(res, type, label);
                return typeLabel;
            }
        }
        finally {
            if (cursor != null) {
                cursor.close();
            }
        }
        return defaultLabel;
    }

    public static String getVoicemailNumber(Context context) {
        if (sVoicemailNumber == null) {
            sVoicemailNumber = getTelephonyManager(context).getVoiceMailNumber();
        }
        return sVoicemailNumber;
    }

    public static TelephonyManager getTelephonyManager(Context context) {
        if (sTelephonyManager == null) {
            sTelephonyManager =
                    (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        }
        return sTelephonyManager;
    }

    public static String getFormattedNumber(Context context, String number) {
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "getFormattedNumber: " + number);
        }
        if (number == null) {
            return "";
        }

        String countryIso = getTelephonyManager(context).getSimCountryIso().toUpperCase(Locale.US);
        if (countryIso.length() != 2) {
            countryIso = Locale.getDefault().getCountry();
            if (countryIso == null || countryIso.length() != 2) {
                countryIso = "US";
            }
        }
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "PhoneNumberUtils.formatNumberToE16, number: "
                    + number + ", country: " + countryIso);
        }
        String e164 = PhoneNumberUtils.formatNumberToE164(number, countryIso);
        String formattedNumber = PhoneNumberUtils.formatNumber(number, e164, countryIso);
        formattedNumber = TextUtils.isEmpty(formattedNumber) ? number : formattedNumber;
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "getFormattedNumber, result: " + formattedNumber);
        }
        return formattedNumber;
    }

    public static String getDisplayName(Context context, UiCall call) {
        // A call might get created before its children are added. In that case, the display name
        // would go from "Unknown" to "Conference call" therefore we don't want to cache it.
        if (call.hasChildren()) {
            return context.getString(R.string.conference_call);
        }

        return getDisplayName(context, call.getNumber(), call.getGatewayInfoOriginalAddress());
    }

    public static String getDisplayName(Context context, String number) {
        return getDisplayName(context, number, null);
    }

    private static String getDisplayName(Context context, String number, Uri gatewayOriginalAddress) {
        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "getDisplayName: " + number
                    + ", gatewayOriginalAddress: " + gatewayOriginalAddress);
        }

        if (TextUtils.isEmpty(number)) {
            return context.getString(R.string.unknown);
        }
        ContentResolver cr = context.getContentResolver();
        String name;
        if (number.equals(getVoicemailNumber(context))) {
            name = context.getResources().getString(R.string.voicemail);
        } else {
            name = getContactNameFromNumber(cr, number);
        }

        if (name == null) {
            name = getFormattedNumber(context, number);
        }
        if (name == null && gatewayOriginalAddress != null) {
            name = gatewayOriginalAddress.getSchemeSpecificPart();
        }
        if (name == null) {
            name = context.getString(R.string.unknown);
        }
        return name;
    }

    private static String getContactNameFromNumber(ContentResolver cr, String number) {
        Uri uri = Uri.withAppendedPath(
                ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(number));

        Cursor cursor = null;
        String name = null;
        try {
            cursor = cr.query(uri,
                    new String[] {ContactsContract.PhoneLookup.DISPLAY_NAME}, null, null, null);
            if (cursor != null && cursor.moveToFirst()) {
                name = cursor.getString(0);
            }
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
        return name;
    }

    /**
     * @return A formatted string that has information about the phone call
     * Possible strings:
     * "Mobile · Dialing"
     * "Mobile · 1:05"
     * "Bluetooth disconnected"
     */
    public static String getCallInfoText(Context context, UiCall call, CharSequence label) {
        String text;
        if (call.getState() == Call.STATE_ACTIVE) {
            long duration = System.currentTimeMillis() - call.getConnectTimeMillis();
            String durationString = DateUtils.formatElapsedTime(duration / 1000);
            if (!TextUtils.isEmpty(durationString) && !TextUtils.isEmpty(label)) {
                text = context.getString(R.string.phone_label_with_info, label, durationString);
            } else if (!TextUtils.isEmpty(durationString)) {
                text = durationString;
            } else if (!TextUtils.isEmpty(label)) {
                text = (String) label;
            } else {
                text = "";
            }
        } else {
            String state = callStateToUiString(context, call.getState());
            if (!TextUtils.isEmpty(label)) {
                text = context.getString(R.string.phone_label_with_info, label, state);
            } else {
                text = state;
            }
        }
        return text;
    }

    /**
     * @return A string representation of the call state that can be presented to a user.
     */
    public static String callStateToUiString(Context context, int state) {
        Resources res = context.getResources();
        switch(state) {
            case Call.STATE_ACTIVE:
                return res.getString(R.string.call_state_call_active);
            case Call.STATE_HOLDING:
                return res.getString(R.string.call_state_hold);
            case Call.STATE_NEW:
            case Call.STATE_CONNECTING:
                return res.getString(R.string.call_state_connecting);
            case Call.STATE_SELECT_PHONE_ACCOUNT:
            case Call.STATE_DIALING:
                return res.getString(R.string.call_state_dialing);
            case Call.STATE_DISCONNECTED:
                return res.getString(R.string.call_state_call_ended);
            case Call.STATE_RINGING:
                return res.getString(R.string.call_state_call_ringing);
            case Call.STATE_DISCONNECTING:
                return res.getString(R.string.call_state_call_ending);
            default:
                throw new IllegalStateException("Unknown Call State: " + state);
        }
    }

    public static boolean isNetworkAvailable(Context context) {
        TelephonyManager tm =
                (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        return tm.getNetworkType() != TelephonyManager.NETWORK_TYPE_UNKNOWN &&
                tm.getSimState() == TelephonyManager.SIM_STATE_READY;
    }

    public static boolean isAirplaneModeOn(Context context) {
        return Settings.System.getInt(context.getContentResolver(),
                Settings.Global.AIRPLANE_MODE_ON, 0) != 0;
    }

    /**
     * Sets a Contact bitmap on the provided image taking into account fail cases.
     * It will attempt to load a Bitmap from the Contacts store, otherwise it will paint
     * a the first letter of the contact name.
     *
     * @param number A key to have a consisten color per phone number.
     * @return A worker task if a new one was needed to load the bitmap.
     */
    @Nullable public static ContactBitmapWorker setContactBitmapAsync(Context context,
            final ImageView icon, final @Nullable String name, final String number) {
        return ContactBitmapWorker.loadBitmap(context.getContentResolver(), icon, number,
                new ContactBitmapWorker.BitmapWorkerListener() {
                    @Override
                    public void onBitmapLoaded(@Nullable Bitmap bitmap) {
                        Resources r = icon.getResources();
                        if (bitmap != null) {
                            icon.setScaleType(ImageView.ScaleType.CENTER_CROP);
                            icon.setImageDrawable(new CircleBitmapDrawable(r, bitmap));
                        } else {
                            icon.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
                            LetterTileDrawable letterTileDrawable = new LetterTileDrawable(r);
                            letterTileDrawable.setContactDetails(name, number);
                            letterTileDrawable.setIsCircular(true);
                            icon.setImageDrawable(letterTileDrawable);
                        }
                    }
                });
    }

}