using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.Synchronization.Local
{
    /// <summary>
    /// Represents an SQLite to SQLite file synchronizer.
    /// </summary>
    public class LocalDBSynchronizer
    {
        /// <summary>
        /// Synchronizes the specified master and slave SQLite files.
        /// </summary>
        /// <param name="masterSQLiteFile">The master SQLite file.</param>
        /// <param name="slaveSQLiteFile">The slave SQLite file.</param>
        /// <returns></returns>
        public static List<Diff> Synchronize(String masterSQLiteFile, String slaveSQLiteFile)
        {
            using (LocalDBComparer comparer = new LocalDBComparer(new SQLiteDataBase(masterSQLiteFile), new SQLiteDataBase(slaveSQLiteFile)))
            {
                var diffs = comparer.Compare();
                foreach (var diff in diffs)
                {
                    diff.Commit();
                }

                return diffs;
            }
        }

        /// <summary>
        /// Synchronizes the specified master and slave SQLite files asynchronously.
        /// </summary>
        /// <param name="masterSQLiteFile">The master SQLite file.</param>
        /// <param name="slaveSQLiteFile">The slave SQLite file.</param>
        /// <returns></returns>
        public static Task<List<Diff>> SynchronizeAsync(String masterSQLiteFile, String slaveSQLiteFile)
        {
            return Task.Factory.StartNew<List<Diff>>(() => { return Synchronize(masterSQLiteFile, slaveSQLiteFile); });
        }
    }
}