#include "components/misc/osgpluginchecker.hpp"

#include <components/debug/debuglog.hpp>
#include <components/misc/strings/conversion.hpp>

#include <osg/Config>
#include <osg/Version>
#include <osgDB/FileUtils>
#include <osgDB/PluginQuery>

#include <algorithm>
#include <array>
#include <filesystem>
#include <string_view>

namespace Misc
{
#if defined(OSG_LIBRARY_STATIC) || defined(__APPLE__)

    bool checkRequiredOSGPluginsArePresent()
    {
        // assume they were linked in at build time and CMake would have failed if they were missing
        // true-ish for MacOS - they're copied into the package and that'd fail if they were missing,
        // but if you don't actually make a MacOS package and run a local build, this won't notice.
        // the workaround in the real implementation isn't powerful enough to make MacOS work, though.
        return true;
    }

#else

    namespace
    {
        constexpr auto USED_OSG_PLUGIN_FILENAMES = std::to_array<std::string_view>({${USED_OSG_PLUGIN_FILENAMES_FORMATTED}});
    }

    bool checkRequiredOSGPluginsArePresent()
    {
        // work around osgDB::listAllAvailablePlugins() not working on some platforms due to a suspected OSG bug
        std::filesystem::path pluginDirectoryName = std::string("osgPlugins-") + std::string(osgGetVersion());
        osgDB::FilePathList& filepath = osgDB::getLibraryFilePathList();
        for (const auto& path : filepath)
        {
#ifdef OSG_USE_UTF8_FILENAME
            std::filesystem::path osgPath{ StringUtils::stringToU8String(path) };
#else
            std::filesystem::path osgPath{ path };
#endif
            if (!osgPath.has_filename())
                osgPath = osgPath.parent_path();

            if (osgPath.filename() == pluginDirectoryName)
            {
                osgPath = osgPath.parent_path();
#ifdef OSG_USE_UTF8_FILENAME
                std::string extraPath = StringUtils::u8StringToString(osgPath.u8string());
#else
                std::string extraPath = osgPath.string();
#endif
                filepath.emplace_back(std::move(extraPath));
            }
        }

        auto availableOSGPlugins = osgDB::listAllAvailablePlugins();
        bool haveAllPlugins = true;
        for (std::string_view plugin : USED_OSG_PLUGIN_FILENAMES)
        {
            if (std::find_if(availableOSGPlugins.begin(), availableOSGPlugins.end(),
                    [&](std::string_view availablePlugin) {
#ifdef OSG_USE_UTF8_FILENAME
                        std::filesystem::path pluginPath{ StringUtils::stringToU8String(availablePlugin) };
#else
                std::filesystem::path pluginPath {availablePlugin};
#endif
                        return pluginPath.filename() == plugin;
                    })
                == availableOSGPlugins.end())
            {
                Log(Debug::Error) << "Missing OSG plugin: " << plugin;
                haveAllPlugins = false;
            }
        }
        return haveAllPlugins;
    }

#endif
}