#ifndef SLANG_DIRECTORY_UTIL_H
#define SLANG_DIRECTORY_UTIL_H

#include "../../source/core/slang-io.h"

class CombinePathVisitor : public Slang::Path::Visitor
{
public:
    virtual void accept(Slang::Path::Type type, const Slang::UnownedStringSlice& filename)
        SLANG_OVERRIDE
    {
        using namespace Slang;
        const Path::TypeFlags flags = Path::TypeFlags(1) << int(type);
        if (flags & m_allowedFlags)
        {
            m_paths.add(Path::combine(m_directoryPath, filename));
        }
    }

    /// Ctor
    CombinePathVisitor(const Slang::String& directoryPath, Slang::Path::TypeFlags allowedFlags)
        : m_directoryPath(directoryPath), m_allowedFlags(allowedFlags)
    {
    }

    Slang::List<Slang::String> m_paths;

protected:
    Slang::Path::TypeFlags m_allowedFlags;
    Slang::String m_directoryPath;
};

/* A helper class for finding the contents of directories */
class DirectoryUtil
{
public:
    /// Enumerate subdirectories in the given `directoryPath`, storing in outPaths.
    /// @return SLANG_OK on success or SLANG_E_NOT_FOUND if directory is not found.
    static SlangResult findDirectories(
        const Slang::String& directoryPath,
        Slang::List<Slang::String>& outPaths);

    /// Enumerate files in the given `directoryPath` that match the provided
    /// `pattern` as a simplified regex for files to return (e.g., "*.txt")
    /// Note that the specifics of the pattern matching are *target specific*
    /// @return SLANG_OK on success or SLANG_E_NOT_FOUND if directory is not found.
    static SlangResult findFilesMatchingPattern(
        const Slang::String& directoryPath,
        const char* pattern,
        Slang::List<Slang::String>& outPaths);

    /// Enumerate files in the given `directoryPath`, storing in outPaths.
    /// @return SLANG_OK on success or SLANG_E_NOT_FOUND if directory is not found.
    static SlangResult findFiles(
        const Slang::String& directoryPath,
        Slang::List<Slang::String>& outPaths);
};

#endif // SLANG_DIRECTORY_UTIL_H