TableFile.hpp

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#pragma once
 
#include <cstddef>
#include <filesystem>
#include <functional>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
 
#include "Catalog.hpp"
 
namespace tinysql {
 
using Row = std::vector<std::string>;
 
class TableFile {
public:
    TableFile(const TableSchema& schema, std::filesystem::path path);
 
    std::vector<Row> readRows() const;
 
    long long nextId() const;
 
    void append(const Row& values) const;
 
    void appendRows(const std::vector<Row>& rows) const;
 
    std::size_t removeRows(const std::function<bool(const Row&)>& shouldRemove) const;
 
    std::size_t updateRows(const std::function<bool(const Row&)>& shouldUpdate,
                           const std::vector<std::pair<std::size_t, std::string>>& newValues) const;
 
private:
    enum class Change {
        Keep,    
        Remove,  
        Update,  
    };
 
    std::size_t rewrite(const std::function<Change(std::string& line, const Row& row)>& decide) const;
 
    Row splitLine(std::string_view line) const;
 
    const TableSchema& schema_;  
    std::filesystem::path path_;  
};
 
}  // namespace tinysql