#include <unistd.h>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <cmath>
#include "appContext.hpp"
#include "history.hpp"
#include "exception.hpp"

using namespace knacki::cd;

void Usage(std::ostream &out, const std::string &progName)
{
    // --history
    // --histDir
    // --histFile
    /*  "--gethistfile"
        "--history"
        "--flush" || "-F"
        "--verbose" || "-v"
        "--help"
    */
    out << progName << std::endl;
}

AppContext *GetAppContext(char **av)
{
    AppContext *app;

    try
    {
        app = new AppContext(av);
    }
    catch (ArgumentException &e)
    {
        std::cerr << av[0] << ": Invalid argument " << e.GetWrongArg() << std::endl;
        Usage(std::cerr, av[0]);
        return nullptr;
    }
    return app;
}

void PrintHistory(std::ostream &out, const std::string &progName, const History &hist)
{
    if (hist.GetEntries().empty())
    {
        out << progName << ": No entry" << std::endl;
    }
    else
    {
        const unsigned int maxSize = (unsigned int) std::log10(hist.GetEntries().size()) +1;

        for (HistoryEntry i : hist.GetEntries())
        {
            if (hist.IsPrevious(i))
                out << "-";
            else if (hist.IsCurrent(i))
                out << ">";
            else
                out << " ";
            out << std::setfill(' ') << std::setw(maxSize) << ((size_t)(i.GetIndex())) << ": " << i.GetPath() << std::endl;
        }
    }
}

int main(int, char **av)
{
    AppContext *app = GetAppContext(av);
    bool written = false;

    if (!app)
        return 0;
    if (app->GetArgs().usageOnly)
    {
        Usage(std::cout, av[0]);
        return 0;
    }

    History *hist;
    try
    {
        if (app->IsReadOnly())
        {
            hist = new History(app->GetArgs().histAbsolutePath);
        }
        else
        {
            hist = new HistoryRW(app->GetArgs().histAbsolutePath);
        }
    }
    catch (IOError &e)
    {
        std::cerr << av[0] << ": " << app->GetArgs().histAbsolutePath << ": " << e.what << std::endl;
        return 0;
    }

    if (app->GetArgs().historyOnly)
        PrintHistory(std::cerr, av[0], *hist);
    if (app->GetArgs().getHistoryFile)
        std::cout << app->GetArgs().histAbsolutePath;
    if (app->GetArgs().flush)
        written |= ((HistoryRW*)hist)->Flush();

    const HistoryEntry *nextEnt = app->IsReadOnly() ? nullptr : hist->GetNextWorkingDirectory(*app);
    if (nextEnt)
    {
        written |= ((HistoryRW*)hist)->Append(*nextEnt);
        if (app->GetArgs().verbose)
            std::cerr << nextEnt->GetPath() << std::endl;
        std::cout << nextEnt->GetPath() << std::endl;
        delete nextEnt;
    }

    if (written)
        ((HistoryRW*)hist)->Write();

    delete hist;
    delete app;
}