/***
    Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: FSRecursion.cpp
    Date: 2022-11-06
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "FS.hpp"

namespace Aurora::IO::FS
{
    struct RecursiveDirIterator : IReadDir
    {
        AuSPtr<IReadDir> pDir;
        AuList<AuString> nextLevel;
        AuString curPath;
        AuString curSubDir;

        bool OpenDir(const AuString &str)
        {
            curPath = str;
            pDir = ReadDir(str);
            return bool(pDir);
        }

        bool OpenNext(const AuString &str)
        {
            curPath = str;
            pDir = ReadDir(str);
            return bool(pDir);
        }

        void DoNext()
        {
            this->pDir.reset();

            if (!nextLevel.size())
            {
                return;
            }

            auto a = nextLevel[0];
            nextLevel.erase(nextLevel.begin());
            pDir = ReadDir(curPath + "/" + a);
            curSubDir = a;
        }

        virtual StatEx *Next() override
        {
            if (!this->pDir)
            {
                return {};
            }

            auto pNext = this->pDir->Next();
            while (!pNext)
            {
                DoNext();
                if (!this->pDir)
                {
                    return {};
                }

                pNext = this->pDir->Next();
            }

            if (curSubDir.size())
            {
                pNext->fileName.insert(pNext->fileName.begin(), curSubDir.begin(), curSubDir.end());
            }

            if (pNext->bExistsDirectory)
            {
                nextLevel.push_back(pNext->fileName + "/");
            }

            return pNext;
        }
    };

    AUKN_SYM AuSPtr<IReadDir> ReadDirRecursive(const AuString &string)
    {
        auto pObj = AuMakeShared<RecursiveDirIterator>();
        if (!pObj)
        {
            SysPushErrorMem();
            return {};
        }

        if (!pObj->OpenDir(string))
        {
            return {};
        }

        return pObj;
    }
}