#include <luna/CPath.h>
#include <luna/PathParser.h>
#include <luna/ScopeGuard.h>

Result<PathParser> PathParser::create(const char* path)
{
    char* copy = strdup(path);
    if (!copy) return err(ENOMEM);

    return PathParser { path, copy };
}

PathParser::PathParser(const char* original, char* copy) : m_original(original), m_copy(copy)
{
}

PathParser::PathParser(PathParser&& other) : m_original(other.m_original), m_copy(other.m_copy)
{
    other.m_copy = nullptr;
}

PathParser::~PathParser()
{
    if (m_copy) free_impl(m_copy);
}

Option<const char*> PathParser::next()
{
    char* result = strtok(m_already_called_next ? nullptr : m_copy, "/");
    m_already_called_next = true;

    if (!result) return {};

    return result;
}

Result<OwnedStringView> PathParser::basename()
{
    char* copy = strdup(m_original);
    if (!copy) return err(ENOMEM);

    auto guard = make_scope_guard([copy] { free_impl(copy); });

    char* result = ::basename(copy);

    // We must copy this as we cannot rely on the original string.
    return OwnedStringView::from_string_literal(result);
}

Result<OwnedStringView> PathParser::dirname()
{
    char* copy = strdup(m_original);
    if (!copy) return err(ENOMEM);

    auto guard = make_scope_guard([copy] { free_impl(copy); });

    char* result = ::dirname(copy);

    // We must copy this as we cannot rely on the original string.
    return OwnedStringView::from_string_literal(result);
}