using Connected.Expressions.Serialization;
using System.Diagnostics;
using System.Linq.Expressions;

namespace Connected.Expressions;

public enum DatabaseExpressionType
{
    Table = 1000,
    ClientJoin = 1001,
    Column = 1002,
    Select = 1003,
    Projection = 1004,
    Entity = 1005,
    Join = 1006,
    Aggregate = 1007,
    Scalar = 1008,
    Exists = 1009,
    In = 1010,
    Grouping = 1011,
    AggregateSubquery = 1012,
    IsNull = 1013,
    Between = 1014,
    RowCount = 1015,
    NamedValue = 1016,
    OuterJoined = 1017,
    Batch = 1018,
    Function = 1019,
    Block = 1020,
    If = 1021,
    Declaration = 1022,
    Variable = 1023
}

[DebuggerDisplay("{DebugText}")]
public abstract class DatabaseExpression : Expression
{
    private readonly Type _type;

    protected DatabaseExpression(DatabaseExpressionType expressionType, Type type)
    {
        ExpressionType = expressionType;
        _type = type;
    }
    public DatabaseExpressionType ExpressionType { get; }

    public override ExpressionType NodeType => (ExpressionType)(int)ExpressionType;
    public override Type Type => _type;

    private string DebugText => $"{GetType().Name}: {DatabaseExpressionExtensions.ResolveNodeTypeName(this)} := {this}";

    public override string ToString()
    {
        return DatabaseSerializer.Serialize(this);
    }
}