#pragma once

#include "glacier/container/vector.h"
#include "glacier/string/string.h"
#include "glacier/string/string_view.h"

namespace glcr {

class StringBuilder {
 public:
  virtual uint64_t size() const = 0;
  virtual void PushBack(const StringView& str) = 0;
  virtual void PushBack(const char str) = 0;

  virtual String ToString() const = 0;

  virtual operator StringView() const = 0;
};

class VariableStringBuilder : public StringBuilder {
 public:
  VariableStringBuilder() = default;
  VariableStringBuilder(const VariableStringBuilder&) = delete;
  VariableStringBuilder(VariableStringBuilder&&) = default;

  ~VariableStringBuilder() = default;

  virtual uint64_t size() const override;

  virtual void PushBack(const StringView& str) override;
  virtual void PushBack(const char str) override;

  virtual String ToString() const override;

  // Note that this could become invalidated
  // at any time if more characters are pushed
  // onto the builder.
  virtual operator StringView() const override;

 private:
  Vector<char> data_;
};

}  // namespace glcr