#pragma once

#include <algorithm>
#include <cctype>
#include <compare>
#include <string>
#include <string_view>

#include <jvalidate/detail/compare.h>
#include <jvalidate/detail/expect.h>

namespace jvalidate::detail {
class Anchor {
private:
  std::string content_;

public:
  Anchor() = default;

  explicit Anchor(std::string_view content) : content_(content) {
    EXPECT_M(content.empty() || content[0] == '_' || std::isalpha(content[0]),
             "First character of an Anchor must be alphabetic or '_'");
    EXPECT_M(
        std::all_of(content.begin(), content.end(),
                    [](char c) { return std::isalnum(c) || c == '_' || c == '.' || c == '-'; }),
        "Illegal character(s) in anchor");
  }

  explicit operator std::string const &() const { return content_; }
  bool empty() const { return content_.empty(); }

  friend std::ostream & operator<<(std::ostream & os, Anchor const & self) {
    return os << self.content_;
  }

  auto operator<=>(Anchor const & lhs) const = default;
};
}