#ifndef BUFFER_HH
#define BUFFER_HH

#include <cstddef>
#include <memory>

class Buffer {
 public:
  virtual ~Buffer() = default;

  virtual void const* rptr(size_t& avail, size_t need = 1) = 0;
  virtual void consume(size_t size) = 0;

  virtual void* wptr(size_t& avail, size_t need = 1) = 0;
  virtual void commit(size_t size) = 0;

  [[nodiscard]] virtual bool full() const = 0;
  [[nodiscard]] virtual bool empty() const = 0;

  [[nodiscard]]
  static std::unique_ptr<Buffer> fixed(size_t size);
  [[nodiscard]]
  static std::unique_ptr<Buffer> dynamic(size_t start_size, size_t max_size);

 protected:
  Buffer() = default;
  Buffer(Buffer const&) = delete;
  Buffer& operator=(Buffer const&) = delete;
};

#endif  // BUFFER_HH