/**
 * Copyright (C) 2014 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.server.soundtrigger;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.hardware.soundtrigger.SoundTrigger;
import android.hardware.soundtrigger.SoundTrigger.GenericSoundModel;
import android.text.TextUtils;
import android.util.Slog;

import java.util.Locale;
import java.util.UUID;

/**
 * Helper to manage the database of the sound models that have been registered on the device.
 *
 * @hide
 */
public class SoundTriggerDbHelper extends SQLiteOpenHelper {
    static final String TAG = "SoundTriggerDbHelper";
    static final boolean DBG = false;

    private static final String NAME = "st_sound_model.db";
    private static final int VERSION = 1;

    // Sound trigger-based sound models.
    public static interface GenericSoundModelContract {
        public static final String TABLE = "st_sound_model";
        public static final String KEY_MODEL_UUID = "model_uuid";
        public static final String KEY_VENDOR_UUID = "vendor_uuid";
        public static final String KEY_DATA = "data";
    }


    // Table Create Statement for the sound trigger table
    private static final String CREATE_TABLE_ST_SOUND_MODEL = "CREATE TABLE "
            + GenericSoundModelContract.TABLE + "("
            + GenericSoundModelContract.KEY_MODEL_UUID + " TEXT PRIMARY KEY,"
            + GenericSoundModelContract.KEY_VENDOR_UUID + " TEXT,"
            + GenericSoundModelContract.KEY_DATA + " BLOB" + " )";


    public SoundTriggerDbHelper(Context context) {
        super(context, NAME, null, VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // creating required tables
        db.execSQL(CREATE_TABLE_ST_SOUND_MODEL);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO: For now, drop older tables and recreate new ones.
        db.execSQL("DROP TABLE IF EXISTS " + GenericSoundModelContract.TABLE);
        onCreate(db);
    }

    /**
     * Updates the given sound trigger model, adds it, if it doesn't already exist.
     *
     */
    public boolean updateGenericSoundModel(GenericSoundModel soundModel) {
        synchronized(this) {
            SQLiteDatabase db = getWritableDatabase();
            ContentValues values = new ContentValues();
            values.put(GenericSoundModelContract.KEY_MODEL_UUID, soundModel.uuid.toString());
            values.put(GenericSoundModelContract.KEY_VENDOR_UUID, soundModel.vendorUuid.toString());
            values.put(GenericSoundModelContract.KEY_DATA, soundModel.data);

            try {
                return db.insertWithOnConflict(GenericSoundModelContract.TABLE, null, values,
                        SQLiteDatabase.CONFLICT_REPLACE) != -1;
            } finally {
                db.close();
            }

        }
    }

    public GenericSoundModel getGenericSoundModel(UUID model_uuid) {
        synchronized(this) {

            // Find the corresponding sound model ID for the keyphrase.
            String selectQuery = "SELECT  * FROM " + GenericSoundModelContract.TABLE
                    + " WHERE " + GenericSoundModelContract.KEY_MODEL_UUID + "= '" +
                    model_uuid + "'";
            SQLiteDatabase db = getReadableDatabase();
            Cursor c = db.rawQuery(selectQuery, null);
            try {
                if (c.moveToFirst()) {
                    do {
                        byte[] data = c.getBlob(c.getColumnIndex(
                                GenericSoundModelContract.KEY_DATA));
                        String vendor_uuid = c.getString(
                                c.getColumnIndex(GenericSoundModelContract.KEY_VENDOR_UUID));
                        return new GenericSoundModel(model_uuid, UUID.fromString(vendor_uuid),
                                data);
                    } while (c.moveToNext());
                }
            } finally {
                c.close();
                db.close();
            }
        }
        return null;
    }

    public boolean deleteGenericSoundModel(UUID model_uuid) {
        synchronized(this) {
            GenericSoundModel soundModel = getGenericSoundModel(model_uuid);
            if (soundModel == null) {
                return false;
            }
            // Delete all sound models for the given keyphrase and specified user.
            SQLiteDatabase db = getWritableDatabase();
            String soundModelClause = GenericSoundModelContract.KEY_MODEL_UUID
                    + "='" + soundModel.uuid.toString() + "'";
            try {
                return db.delete(GenericSoundModelContract.TABLE, soundModelClause, null) != 0;
            } finally {
                db.close();
            }
        }
    }
}