initial runs

src/file_writer.cpp

@@ -0,0 +1,47 @@
+#include "../include/file_writer.hpp"
+
+void FileWriter::write_buffer()
+{
+    for (size_t i = 0; i < current_pos_; i++) {
+        stream_ << buffer_[i] << "\n";
+    }
+    current_pos_ = 0;
+}
+
+FileWriter::FileWriter(const std::string& filename, size_t buffer_size)
+    : buffer_(buffer_size)
+    , current_pos_(0)
+    , total_writes_(0)
+{
+    std::filesystem::path file_path(filename);
+    std::filesystem::path dir_path = file_path.parent_path();
+    std::filesystem::create_directories(dir_path);
+    stream_.open(filename);
+}
+
+FileWriter::~FileWriter()
+{
+    write_buffer();
+}
+
+void FileWriter::write(const Record& record)
+{
+    if (current_pos_ >= buffer_.size()) {
+        write_buffer();
+    }
+    buffer_[current_pos_] = record;
+    current_pos_++;
+    total_writes_++;
+}
+
+void FileWriter::write_chunk(std::span<const Record>& chunk)
+{
+    for (const auto& record : chunk) {
+        write(record);
+    }
+}
+
+size_t FileWriter::total_writes() const
+{
+    return total_writes_;
+}