using System.Data.SqlClient;

namespace AdvertisingProfitControlData
{
    public class Restore
    {
        public string ErrorMessage = string.Empty;

        public bool SingleFileRestore(string databaseFilePath, string defaultServerName)
        {
            var sqlConStrBuilder = new SqlConnectionStringBuilder(AdvertisingProfitControlDbContext.ConnectionString);
            var masterConnection = @"data source=" + defaultServerName + @";integrated security=True;MultipleActiveResultSets=True;App=EntityFramework";
            try
            {
                using (var conn = new SqlConnection(masterConnection))
                {
                    var db = new AdvertisingProfitControlDbContext();
                    //Drop the database to make sure it can be recreated and restored (necessary since the database MUST be on line for its file to be wiped from disk).
                    db.Database.Delete();
                    var query =
                            @"BEGIN TRY
	                        DECLARE @DefaultDataPath varchar(max)
                            DECLARE @DefaultLogPath varchar(max)
                            SELECT @DefaultDataPath = CONVERT(varchar(max),SERVERPROPERTY('INSTANCEDEFAULTDATAPATH'))
                            SELECT @DefaultLogPath = CONVERT(varchar(max),SERVERPROPERTY('INSTANCEDEFAULTLOGPATH'))
                            SELECT @DefaultDataPath = CONCAT(@DefaultDataPath, N'" + sqlConStrBuilder.InitialCatalog + @".mdf')
                            SELECT @DefaultLogPath = CONCAT(@DefaultLogPath, N'" + sqlConStrBuilder.InitialCatalog + @".ldf')
                            IF db_id(N'" + sqlConStrBuilder.InitialCatalog + @"') IS NOT NULL
	                            BEGIN
                                    CREATE DATABASE " + sqlConStrBuilder.InitialCatalog + @"
	                            END
                            RESTORE DATABASE " + sqlConStrBuilder.InitialCatalog + @" FROM DISK ='" + databaseFilePath + @"' WITH CHECKSUM, REPLACE,
                            MOVE '" + sqlConStrBuilder.InitialCatalog + @"' TO @DefaultDataPath,   
                            MOVE '" + sqlConStrBuilder.InitialCatalog + @"_log' TO @DefaultLogPath
                            END TRY
                            BEGIN CATCH
	                            DECLARE @Error varchar(max)
	                            SELECT @Error = ERROR_MESSAGE()
	                            RAISERROR(@Error, 11, 1)
                            END CATCH";
                    //TODO: Verify that the database is good with DBCC command.
                    conn.Open();
                    var restoreCmd = new SqlCommand(query, conn);
                    restoreCmd.ExecuteNonQuery();
                    conn.Close();
                    return true;
                }
            }
            catch (SqlException e)
            {
                ErrorMessage = e.Message;
                return false;
            }
        }
    }
}