yadro-task/include/tapelib/filetape.h

#ifndef FILE_TAPE_H
#define FILE_TAPE_H

#include "tape.h"
#include <cstdint>
#include <fstream>
#include <string>

namespace tape {

/**
 * Strcuture for storing all possible settings for a file tape,
 * such as read dealy, write delay etc.
 */
struct FileTapeSettings {
    unsigned int read_delay_ms;
    unsigned int write_delay_ms;
    unsigned int seek_forward_delay_ms;
    unsigned int seek_backwards_delay_ms;
};

/**
 * Mock tape implementation that uses text files as data source.
 *
 * Simulates tape operations by artificially pausing the execution of some
 * methods using time intervals, specified in command line arguments or a
 * configuration file. Each cell is represented as a seperate line in a file,
 * cell data is stored as plain text.
 */
class FileTape : public Tape {
  private:
    std::fstream file;
    FileTapeSettings settings;

  public:
    FileTape &operator=(const FileTape &) = delete;
    FileTape(const FileTape &) = delete;
    FileTape(FileTape &&) = delete;
    FileTape &operator=(FileTape &&) = delete;
    ~FileTape() override;

    /**
     * Initialize a new instance of FileTape that will open a file with the
     * specified name. File must be read and write accessible.
     *
     * @param file_name Name of a file to be opened.
     * @param settings File tape settings
     */
    explicit FileTape(const std::string &file_name, FileTapeSettings settings);

    /**
     * Advances the underlying fstream to a new line.
     *
     * @return false if EOF is reached, otherwise true.
     */
    bool seek_forward() override;

    /**
     * Rewinds the underlying fstream to a previous line.
     *
     * @return false if called from the first line of a file, otherwise true.
     */
    bool seek_backwards() override;

    /**
     * Reads and parses data from the current line.
     *
     * @return number from the line, or 0 if data can not be parsed.
     */
    int32_t read() override;

    /**
     * Writes data to the current line.
     *
     * @param data Number, that should be written to the current line.
     */
    void write(int32_t data) override;
};

} // namespace tape

#endif