using System;
using System.Linq;
namespace SqlSugar.MySqlConnector
{
    public class MySqlExpressionContext : ExpressionContext, ILambdaExpressions
    {
        public SqlSugarProvider Context { get; set; }
        public MySqlExpressionContext()
        {
            base.DbMehtods = new MySqlMethod();
        }
        public override string SqlTranslationLeft { get { return "`"; } }
        public override string SqlTranslationRight { get { return "`"; } }
    }
    public class MySqlMethod : DefaultDbMethod, IDbMethods
    {
        public override string DateDiff(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter2 = model.Args[1];
            var parameter3 = model.Args[2];
            return string.Format(" TIMESTAMPDIFF({0},{1},{2}) ", parameter.MemberValue?.ToString().ToSqlFilter(), parameter2.MemberName, parameter3.MemberName);
        }
        public override string DateValue(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter2 = model.Args[1];
            if (parameter.MemberName != null && parameter.MemberName is DateTime)
            {
                return string.Format(" {0}('{1}') ", parameter2.MemberValue, parameter.MemberName);
            }
            else
            {
                return string.Format(" {0}({1}) ", parameter2.MemberValue, parameter.MemberName);
            }
        }

        public override string Contains(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter2 = model.Args[1];
            return string.Format(" ({0} like concat('%',{1},'%')) ", parameter.MemberName, parameter2.MemberName  );
        }

        public override string StartsWith(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter2 = model.Args[1];
            return string.Format(" ({0} like concat({1},'%')) ", parameter.MemberName, parameter2.MemberName);
        }

        public override string EndsWith(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter2 = model.Args[1];
            return string.Format(" ({0} like concat('%',{1}))", parameter.MemberName,parameter2.MemberName);
        }

        public override string DateIsSameDay(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter2 = model.Args[1];
            return string.Format(" (TIMESTAMPDIFF(day,date({0}),date({1}))=0) ", parameter.MemberName, parameter2.MemberName); ;
        }

        public override string DateIsSameByType(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter2 = model.Args[1];
            var parameter3 = model.Args[2];
            return string.Format(" (TIMESTAMPDIFF({2},{0},{1})=0) ", parameter.MemberName, parameter2.MemberName, parameter3.MemberValue);
        }

        public override string DateAddByType(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter2 = model.Args[1];
            var parameter3 = model.Args[2];
            if (parameter3.MemberValue.ObjToString() == "Millisecond") 
            {
                parameter3.MemberValue = "Second";
                return string.Format(" (DATE_ADD({1} , INTERVAL {2}/1000 {0})) ", parameter3.MemberValue, parameter.MemberName, parameter2.MemberName);
            }
            return string.Format(" (DATE_ADD({1} , INTERVAL {2} {0})) ", parameter3.MemberValue, parameter.MemberName, parameter2.MemberName);
        }

        public override string DateAddDay(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter2 = model.Args[1];
            return string.Format(" (DATE_ADD({0}, INTERVAL {1} day)) ", parameter.MemberName, parameter2.MemberName);
        }

        public override string ToInt32(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            return string.Format(" CAST({0} AS SIGNED)", parameter.MemberName);
        }

        public override string ToInt64(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            return string.Format(" CAST({0} AS SIGNED)", parameter.MemberName);
        }

        public override string ToString(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            return string.Format(" CAST({0} AS CHAR)", parameter.MemberName);
        }

        public override string ToGuid(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            return string.Format(" CAST({0} AS CHAR)", parameter.MemberName);
        }

        public override string ToDouble(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            return string.Format(" CAST({0} AS DECIMAL(18,4))", parameter.MemberName);
        }

        public override string ToBool(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            return string.Format(" CAST({0} AS SIGNED)", parameter.MemberName);
        }

        public override string ToDecimal(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            return string.Format(" CAST({0} AS DECIMAL(18,4))", parameter.MemberName);
        }

        public override string Length(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            return string.Format(" LENGTH({0})", parameter.MemberName);
        }
        public override string MergeString(params string[] strings)
        {
            return " concat("+string.Join(",", strings) + ") ";
        }
        public override string IsNull(MethodCallExpressionModel model)
        {
            var parameter = model.Args[0];
            var parameter1 = model.Args[1];
            return string.Format("IFNULL({0},{1})", parameter.MemberName, parameter1.MemberName);
        }
        public override string GetDate()
        {
            return "NOW()";
        }

        public override string GetRandom()
        {
            return "rand()";
        }

        public override string CharIndex(MethodCallExpressionModel model)
        {
            return string.Format("instr ({0},{1})", model.Args[0].MemberName, model.Args[1].MemberName);
        }
    }
}