#ifndef EXPR_HH
#define EXPR_HH

#include "../tokenizer.hh"
#include <string>
#include <variant>

struct Expr {};

struct Binary : public Expr {
  Binary(Expr left, Token op, Expr right) : left{left}, op{op}, right{right} {};

  Expr left;
  Token op;
  Expr right;
};

struct Grouping : public Expr {
  Grouping(Expr expr) : expression{expr} {};

  Expr expression;
};

struct Literal : public Expr {
  Literal(Object value) : value{value} {};

  Object value;
};

struct Unary : public Expr {
  Unary(Token op, Expr right) : op{op}, right{right} {};

  Token op;
  Expr right;
};

using Expression = std::variant<Expr, Binary, Grouping, Literal, Unary>;

class AstPrinter {
public:
  std::string print(const Expression &expr);
private:
  std::string parenthesize(const std::string &name, std::vector<Expression> exprs);
};

#endif