/**
 * Copyright (c) 2013, Redsolution LTD. All rights reserved.
 *
 * This file is part of Xabber project; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License, Version 3.
 *
 * Xabber is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License,
 * along with this program. If not, see http://www.gnu.org/licenses/.
 */
package com.xabber.android.data.account;

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteStatement;
import android.provider.BaseColumns;

import com.xabber.android.data.AbstractTable;
import com.xabber.android.data.DatabaseManager;

/**
 * Storage with preset statuses.
 *
 * @author alexander.ivanov
 */
class StatusTable extends AbstractTable {

    private static final class Fields implements BaseColumns {
        private Fields() {
        }

        public static final String STATUS_MODE = "status_mode";
        public static final String STATUS_TEXT = "status_text";
    }

    private static final String NAME = "statuses";
    private static final String[] PROJECTION = new String[]{
            Fields.STATUS_MODE, Fields.STATUS_TEXT};

    private final DatabaseManager databaseManager;
    private SQLiteStatement writeStatement;
    private final Object writeLock;

    private final static StatusTable instance;

    static {
        instance = new StatusTable(DatabaseManager.getInstance());
        DatabaseManager.getInstance().addTable(instance);
    }

    public static StatusTable getInstance() {
        return instance;
    }

    private StatusTable(DatabaseManager databaseManager) {
        this.databaseManager = databaseManager;
        writeStatement = null;
        writeLock = new Object();
    }

    @Override
    public void create(SQLiteDatabase db) {
        String sql;
        sql = "CREATE TABLE " + NAME + " (" + Fields.STATUS_MODE + " INTEGER,"
                + Fields.STATUS_TEXT + " TEXT);";
        DatabaseManager.execSQL(db, sql);
        sql = "CREATE UNIQUE INDEX " + NAME + "_index ON " + NAME + " ("
                + Fields.STATUS_MODE + ", " + Fields.STATUS_TEXT + ");";
        DatabaseManager.execSQL(db, sql);
    }

    @Override
    public void migrate(SQLiteDatabase db, int toVersion) {
        super.migrate(db, toVersion);
        String sql;
        switch (toVersion) {
            case 12:
                sql = "CREATE TABLE statuses (" + "status_mode INTEGER,"
                        + "status_text TEXT);";
                DatabaseManager.execSQL(db, sql);
                sql = "CREATE UNIQUE INDEX statuses_index ON statuses "
                        + "(status_mode, status_text);";
                DatabaseManager.execSQL(db, sql);
                break;
            case 35:
                sql = "ALTER TABLE statuses ADD COLUMN share_location INTEGER;";
                DatabaseManager.execSQL(db, sql);
                sql = "UPDATE statuses SET share_location = 0;";
                DatabaseManager.execSQL(db, sql);
                sql = "DROP INDEX statuses_index;";
                DatabaseManager.execSQL(db, sql);
                sql = "CREATE UNIQUE INDEX statuses_index ON statuses "
                        + "(status_mode, status_text, share_location);";
                DatabaseManager.execSQL(db, sql);
                break;
            case 38:
                sql = "DROP INDEX statuses_index;";
                DatabaseManager.execSQL(db, sql);
                DatabaseManager.renameTable(db, "statuses", "old_statuses");
                sql = "CREATE TABLE statuses (" + "status_mode INTEGER,"
                        + "status_text TEXT);";
                DatabaseManager.execSQL(db, sql);
                sql = "CREATE UNIQUE INDEX statuses_index ON statuses "
                        + "(status_mode, status_text);";
                DatabaseManager.execSQL(db, sql);
                sql = "INSERT OR REPLACE INTO statuses (status_mode, status_text) "
                        + "SELECT status_mode, status_text FROM old_statuses;";
                DatabaseManager.execSQL(db, sql);
                DatabaseManager.dropTable(db, "old_statuses");
                break;
            default:
                break;
        }
    }

    void write(StatusMode statusMode, String statusText) {
        if (statusText == null)
            statusText = "";
        synchronized (writeLock) {
            if (writeStatement == null) {
                SQLiteDatabase db = databaseManager.getWritableDatabase();
                writeStatement = db.compileStatement("INSERT OR REPLACE INTO "
                        + NAME + " (" + Fields.STATUS_MODE + ", "
                        + Fields.STATUS_TEXT + ") VALUES (?, ?);");
            }
            writeStatement.bindLong(1, statusMode.ordinal());
            writeStatement.bindString(2, statusText);
            writeStatement.execute();
        }
    }

    void remove(StatusMode statusMode, String statusText) {
        SQLiteDatabase db = databaseManager.getWritableDatabase();
        db.delete(NAME, Fields.STATUS_MODE + " = ? AND " + Fields.STATUS_TEXT
                + " = ?", new String[]{String.valueOf(statusMode.ordinal()),
                statusText});
    }

    @Override
    protected String getTableName() {
        return NAME;
    }

    @Override
    protected String[] getProjection() {
        return PROJECTION;
    }

    static StatusMode getStatusMode(Cursor cursor) {
        return StatusMode.values()[cursor.getInt(cursor
                .getColumnIndex(Fields.STATUS_MODE))];
    }

    static String getStatusText(Cursor cursor) {
        return cursor.getString(cursor.getColumnIndex(Fields.STATUS_TEXT));
    }

}