using Microsoft.EntityFrameworkCore.Diagnostics;
using MySqlConnector;
using System.Data.Common;
using System.Diagnostics;
using System.Text.RegularExpressions;

namespace YLErp.DataBase.Interceptors
{
    internal class DgDbCommandInterceptor : DbCommandInterceptor
    {
        public override InterceptionResult<DbDataReader> ReaderExecuting(
           DbCommand command,
           CommandEventData eventData,
           InterceptionResult<DbDataReader> result)
        {
            DebugWrite(command);

            return result;
        }

        public override ValueTask<InterceptionResult<DbDataReader>> ReaderExecutingAsync(
            DbCommand command,
            CommandEventData eventData,
            InterceptionResult<DbDataReader> result,
            CancellationToken cancellationToken = default)
        {
            DebugWrite(command);

            return new ValueTask<InterceptionResult<DbDataReader>>(result);
        }

        private static void DebugWrite(DbCommand dbCommand)
        {
            Debug.WriteLine("-------带参数的SQL-------");

            Debug.WriteLine(dbCommand.CommandText);

            Debug.WriteLine("-------参数替换后的SQL-------");
            
            var rawSQL= Regex.Replace(dbCommand.CommandText, "@[_a-zA-Z0-9]+", new MatchEvaluator(m =>
            {
                var para = dbCommand.Parameters[m.Value];
                var value = para.Value?.ToString();

                if (value == null)
                {
                    return "null";
                }

                switch (para.DbType)
                {
                    case System.Data.DbType.String:
                    case System.Data.DbType.StringFixedLength:
                    case System.Data.DbType.AnsiString:
                    case System.Data.DbType.AnsiStringFixedLength:
                    case System.Data.DbType.Date:
                    case System.Data.DbType.DateTime:
                    case System.Data.DbType.DateTime2:
                    case System.Data.DbType.DateTimeOffset:
                        return string.Concat("'", MySqlHelper.EscapeString(value),"'");
                    default: return value;
                }
            }));

            Debug.WriteLine(rawSQL);
        }

        public static readonly DgDbCommandInterceptor Default;

        static DgDbCommandInterceptor()
        {
            Default = new DgDbCommandInterceptor();
        }
    }
}