using System.Collections.Generic;

namespace Finn.AST;

public record Field(Token Name, Expr? Value);

public record BaseRecord(Expr Value, Field[] Updates);

public partial record Variable
{
	public override string ToString()
	{
		return this.Value.Lexeme;
	}
}

public partial record Binary
{
	public override string ToString()
	{
		return $"Binary {{ Left = {this.Left}, Op = {this.Op.Lexeme}, Right = {this.Right} }}";
	}
}

public partial record Literal
{
	public override string ToString()
	{
		return this.Value.ToString()!;
	}
}

public partial record SimplePattern
{
	public override string ToString()
	{
		if (this.Identifier == null)
		{
			return "_";
		}
		return this.Identifier.Lexeme;
	}
}

public abstract record Binding(Expr Value, Token Start);
public record VarBinding(Pattern Pattern, Expr Value) : Binding(Value, Pattern.Start);
public record FuncBinding(Token Name, Pattern[] Params, Expr Value) : Binding(Value, Name)
{
	public override string ToString()
	{
		return $"FuncBinding {{ Name = {Name}, Params = {string.Join(", ", (IEnumerable<object?>)(this.Params))}, Value = {this.Value} }}";
	}
}

public partial record Let
{
	public override string ToString()
	{
		return $"Let {{ Bindings = {string.Join(", ", (IEnumerable<object?>)(this.Bindings))}, Body = {this.Body} }}";
	}
}

public partial record RecordPattern
{
	public override string ToString()
	{
		return $"RecordPattern {{ Bindings = {string.Join(", ", (IEnumerable<object?>)(this.Fields))}, Rest = {this.Rest} }}";
	}
}