using Nub.Lang.Frontend.Lexing;
using Nub.Lang.Frontend.Parsing.Statements;
using Nub.Lang.Frontend.Typing;

namespace Nub.Lang.Frontend.Parsing.Definitions;

public class FuncParameter(string name, NubType type, bool variadic)
{
    public string Name { get; } = name;
    public NubType Type { get; } = type;
    public bool Variadic { get; } = variadic;

    public override string ToString() => $"{Name}: {Type}";
}

public interface IFuncSignature
{
    public string Name { get; }
    public string Namespace { get; }
    public List<FuncParameter> Parameters { get; }
    public Optional<NubType> ReturnType { get; }

    public string ToString() => $"{Name}({string.Join(", ", Parameters.Select(p => p.ToString()))}){(ReturnType.HasValue ? ": " + ReturnType.Value : "")}";
}

public class LocalFuncDefinitionNode(IReadOnlyList<Token> tokens, Optional<string> documentation, string name, string @namespace, List<FuncParameter> parameters, BlockNode body, Optional<NubType> returnType, bool exported) : DefinitionNode(tokens, documentation), IFuncSignature
{
    public string Name { get; } = name;
    public string Namespace { get; } = @namespace;
    public List<FuncParameter> Parameters { get; } = parameters;
    public BlockNode Body { get; } = body;
    public Optional<NubType> ReturnType { get; } = returnType;
    public bool Exported { get; } = exported;

    public override string ToString() => $"{Name}({string.Join(", ", Parameters.Select(p => p.ToString()))}){(ReturnType.HasValue ? ": " + ReturnType.Value : "")}";
}

public class ExternFuncDefinitionNode(IReadOnlyList<Token> tokens, Optional<string> documentation, string name, string @namespace, string callName, List<FuncParameter> parameters, Optional<NubType> returnType) : DefinitionNode(tokens, documentation), IFuncSignature
{
    public string Name { get; } = name;
    public string Namespace { get; } = @namespace;
    public string CallName { get; } = callName;
    public List<FuncParameter> Parameters { get; } = parameters;
    public Optional<NubType> ReturnType { get; } = returnType;

    public override string ToString() => $"{Name}({string.Join(", ", Parameters.Select(p => p.ToString()))}){(ReturnType.HasValue ? ": " + ReturnType.Value : "")}";
}