cd/history.hpp

#pragma once

#include <vector>
#include <string>

namespace knacki::cd{
    class AppContext;
    typedef char PTR_TYPE;

    class IOError
    {
        public:
            IOError(const std::string &e): what(e)
            {}

            const std::string what;
    };

    class HistoryEntry
    {
        public:
            HistoryEntry(PTR_TYPE index, const std::string &e);
            HistoryEntry(const HistoryEntry &);
            HistoryEntry &operator=(const HistoryEntry &o);

            const std::string &GetPath() const;
            PTR_TYPE GetIndex() const;

        protected:
            std::string path;
            PTR_TYPE index;
    };

    class History
    {
        public:
            History(const std::string &file);

            const std::vector<HistoryEntry> &GetEntries() const;
            const HistoryEntry *GetNextWorkingDirectory(const AppContext &app) const;

            bool IsPrevious(const HistoryEntry &) const;
            bool IsCurrent(const HistoryEntry &) const;

        protected:
            History() {};
            std::vector<HistoryEntry> hist;
            PTR_TYPE current;
            PTR_TYPE prev;

            void Read(std::istream &file);
            const HistoryEntry *GetHistoryEntry(PTR_TYPE index) const;
    };

    class HistoryRW: public History
    {
        public:
            HistoryRW(const std::string &file);
            bool AppendCwd();
            bool Append(const std::string &);
            bool Append(const HistoryEntry &);
            bool Flush();
            void Write();

        protected:
            void TruncateAfter(PTR_TYPE pos);

        private:
            const std::string path;
    };
}