PlayerLink/src/backends/windows.cpp

#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <objbase.h>
#include <psapi.h>
#include <shlobj.h>
#include <windows.h>
#include <appmodel.h>
#include <winrt/windows.foundation.h>
#include <winrt/windows.foundation.metadata.h>
#include <winrt/windows.media.control.h>
#include <winrt/windows.storage.streams.h>

#include <chrono>
#include <codecvt>
#include <filesystem>

#include "../backend.hpp"
#include "../utils.hpp"

using namespace winrt;
using namespace Windows::Media::Control;
using namespace Windows::Storage::Streams;
#define EM_DASH "\xE2\x80\x94"
// codecvt is deprecated, but there is no good portable way to do this, I could technically use the winapi as this is
// the windows backend tho
std::string toStdString(winrt::hstring in) {
    std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
    return converter.to_bytes(in.c_str());
}

std::string getAppModelIdOfProcess(HANDLE hProc) {
    UINT32 length = 0;
    LONG rc = GetApplicationUserModelId(hProc, &length, NULL);
    if (rc != ERROR_INSUFFICIENT_BUFFER)
        return "";

    PWSTR fullName = (PWSTR)malloc(length * sizeof(*fullName));
    if (!fullName)
        return "";

    rc = GetApplicationUserModelId(hProc, &length, fullName);
    if (rc != ERROR_SUCCESS) {
        free(fullName);
        return "";
    }
    std::string name = toStdString(fullName);
    free(fullName);
    return name;
}

std::string getProcessNameFromAppModelId(std::string appModelId) {
    DWORD processes[1024];
    DWORD cbNeeded;

    if (!EnumProcesses(processes, sizeof(processes), &cbNeeded))
        return "";

    unsigned int processCount = cbNeeded / sizeof(DWORD);

    for (DWORD i = 0; i < processCount; i++) {
        DWORD processID = processes[i];

        HANDLE hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, processID);
        if (hProcess) {
            std::string modelid = getAppModelIdOfProcess(hProcess);
            
            if (modelid != appModelId) {
                CloseHandle(hProcess);
                continue;
            }

            char exeName[MAX_PATH]{};
            DWORD size = MAX_PATH;
            QueryFullProcessImageNameA(hProcess, 0, exeName, &size);
            std::filesystem::path exePath = exeName;
            CloseHandle(hProcess);
            return exePath.filename().string();
        }
    }
    return "";
}

bool CreateShortcut(std::string source, std::string target) {
    CoInitialize(nullptr);
    WCHAR src[MAX_PATH];
    IShellLinkW* pShellLink = nullptr;
    HRESULT hr = CoCreateInstance(CLSID_ShellLink, nullptr, CLSCTX_INPROC_SERVER, IID_IShellLink,
                                  reinterpret_cast<void**>(&pShellLink));

    if (SUCCEEDED(hr) && pShellLink) {
        MultiByteToWideChar(CP_ACP, 0, source.c_str(), -1, src, MAX_PATH);
        pShellLink->SetPath(src);

        IPersistFile* pPersistFile = nullptr;
        hr = pShellLink->QueryInterface(IID_IPersistFile, reinterpret_cast<void**>(&pPersistFile));

        if (SUCCEEDED(hr) && pPersistFile) {
            WCHAR dst[MAX_PATH];
            MultiByteToWideChar(CP_ACP, 0, target.c_str(), -1, dst, MAX_PATH);
            hr = pPersistFile->Save(dst, TRUE);
            pPersistFile->Release();
        }

        pShellLink->Release();
    }

    CoUninitialize();
    return SUCCEEDED(hr);
}

std::filesystem::path backend::getConfigDirectory() {
    std::filesystem::path configDirectoryPath = std::getenv("APPDATA");
    configDirectoryPath = configDirectoryPath / "PlayerLink";
    return configDirectoryPath;
}

bool backend::toggleAutostart(bool enabled) {
    std::filesystem::path shortcutPath = std::getenv("APPDATA");
    shortcutPath = shortcutPath / "Microsoft" / "Windows" / "Start Menu" / "Programs" / "Startup";
    std::filesystem::create_directories(shortcutPath);
    shortcutPath = shortcutPath / "PlayerLink.lnk";

    if (!enabled && std::filesystem::exists(shortcutPath)) {
        std::filesystem::remove(shortcutPath);
        return true;
    }
    char binaryPath[MAX_PATH]{};
    GetModuleFileNameA(NULL, binaryPath, MAX_PATH);
    bool result = CreateShortcut(binaryPath, shortcutPath.string());
    return result;
}

std::shared_ptr<MediaInfo> backend::getMediaInformation() {
    auto sessionManager = GlobalSystemMediaTransportControlsSessionManager::RequestAsync().get();
    auto currentSession = sessionManager.GetCurrentSession();
    if (!currentSession)
        return nullptr;

    auto playbackInfo = currentSession.GetPlaybackInfo();
    auto mediaProperties = currentSession.TryGetMediaPropertiesAsync().get();
    auto timelineInformation = currentSession.GetTimelineProperties();
    if (!mediaProperties)
        return nullptr;

    auto endTime = std::chrono::duration_cast<std::chrono::milliseconds>(timelineInformation.EndTime()).count();
    auto elapsedTime = std::chrono::duration_cast<std::chrono::milliseconds>(timelineInformation.Position()).count();

    auto thumbnail = mediaProperties.Thumbnail();
    std::string thumbnailData = "";

    if (thumbnail) {
        auto stream = thumbnail.OpenReadAsync().get();
        size_t size = static_cast<size_t>(stream.Size());

        DataReader reader(stream);
        reader.LoadAsync(static_cast<uint32_t>(size)).get();

        std::vector<uint8_t> buffer(size);
        reader.ReadBytes(buffer);
        reader.Close();

        thumbnailData = std::string(buffer.begin(), buffer.end());
        stream.Close();
    }

    std::string artist = toStdString(mediaProperties.Artist());
    std::string albumName = toStdString(mediaProperties.AlbumTitle());
    if (artist == "")
        artist = toStdString(mediaProperties.AlbumArtist());  // Needed for some apps

    if (artist.find(EM_DASH) != std::string::npos) {
        albumName = artist.substr(artist.find(EM_DASH) + 3);
        artist = artist.substr(0, artist.find(EM_DASH));
        utils::trim(artist);
        utils::trim(albumName);
    }

    std::string modelId = toStdString(currentSession.SourceAppUserModelId());

    // I do know that this is disgusting, but for some reason microsoft decided to switch out the exe name with the
    // ApplicationUserModelId in some version of windows 11. So we check if it's an exe name, if not we are on some
    // newer windows version and need to get the exe name from the model id. We cannot directly work with the model id
    // because it's unique per machine and therefore would mess up configs with preconfigured apps.
    if (modelId.find(".exe") == std::string::npos)
        modelId = getProcessNameFromAppModelId(modelId);

    return std::make_shared<MediaInfo>(
        playbackInfo.PlaybackStatus() == GlobalSystemMediaTransportControlsSessionPlaybackStatus::Paused,
        toStdString(mediaProperties.Title()), artist, albumName, modelId, thumbnailData, endTime, elapsedTime);
}

bool backend::init() {
    return winrt::Windows::Foundation::Metadata::ApiInformation::IsTypePresent(
        L"Windows.Media.Control.GlobalSystemMediaTransportControlsSessionManager");
}

#undef EM_DASH
#endif