#pragma once

#include <cstdint>
#include <string>
#include <vector>

#include "sedpp/Options.h"

namespace sedpp {

// A loaded input record is sed's starting pattern space for one cycle.  The
// delimiter bit is carried separately so files without a trailing newline remain
// distinguishable all the way to output.
struct Record {
  std::string text;
  std::string fileName;
  bool hadDelimiter = false;
  bool lastInFile = false;
  bool lastOverall = false;
  std::uint64_t lineNumber = 0;
  std::uint64_t fileLineNumber = 0;
};

// Reads stdin or input files eagerly into records.  Eager loading simplifies GNU
// sed's $ address and in-place rewrite behavior, both of which need to know the
// last record before the runner starts emitting final output.
class InputLoader {
public:
  explicit InputLoader(const Options &options);

  [[nodiscard]] std::vector<Record> loadAll() const;
  [[nodiscard]] std::vector<Record> loadFile(const std::string &fileName) const;

private:
  [[nodiscard]] std::vector<Record> splitBuffer(const std::string &buffer,
                                                const std::string &fileName,
                                                std::uint64_t &globalLine) const;

  const Options &options_;
};

} // namespace sedpp