4 files changed, 154 insertions, 1 deletions

diff --git a/accounts/gkleen@sif/shell/quickshell-plugins/CMakeLists.txt b/accounts/gkleen@sif/shell/quickshell-plugins/CMakeLists.txt
index aa363c4c..2123ed35 100644
--- a/accounts/gkleen@sif/shell/quickshell-plugins/CMakeLists.txt
+++ b/accounts/gkleen@sif/shell/quickshell-plugins/CMakeLists.txt
@@ -104,6 +104,7 @@ qt6_add_qml_module(customplugin
 
 target_sources(customplugin PRIVATE
     Chrono.cpp Chrono.hpp
+    FileSelector.cpp FileSelector.hpp
 )
 
 target_compile_features(customplugin PUBLIC cxx_std_26)
diff --git a/accounts/gkleen@sif/shell/quickshell-plugins/Chrono.hpp b/accounts/gkleen@sif/shell/quickshell-plugins/Chrono.hpp
index 4d06007d..04080187 100644
--- a/accounts/gkleen@sif/shell/quickshell-plugins/Chrono.hpp
+++ b/accounts/gkleen@sif/shell/quickshell-plugins/Chrono.hpp
@@ -1,11 +1,12 @@
 #pragma once
 
+#include <chrono>
+
 #include <QDateTime>
 #include <QObject>
 #include <QTimer>
 
 #include <qqmlintegration.h>
-#include <chrono>
 
 class Chrono : public QObject {
   Q_OBJECT;
diff --git a/accounts/gkleen@sif/shell/quickshell-plugins/FileSelector.cpp b/accounts/gkleen@sif/shell/quickshell-plugins/FileSelector.cpp
new file mode 100644
index 00000000..3a0537b6
--- /dev/null
+++ b/accounts/gkleen@sif/shell/quickshell-plugins/FileSelector.cpp
@@ -0,0 +1,99 @@
+#include "FileSelector.hpp"
+
+#include <sstream>
+#include <vector>
+#include <random>
+#include <algorithm>
+
+#include <iostream>
+#include <format>
+
+namespace fs = std::filesystem;
+
+FileSelector::FileSelector(QObject* parent): QObject(parent) {
+  QObject::connect(&this->timer, &QTimer::timeout, this, &FileSelector::onTimeout);
+}
+
+QString FileSelector::directory() const {
+  return QString::fromStdString(this->mDirectory->string());
+}
+void FileSelector::setDirectory(QString directory) {
+  this->mDirectory = directory.toStdString();
+  if (this->mDirectory && this->mEpoch)
+    this->update();
+  emit this->directoryChanged();
+}
+
+unsigned int FileSelector::epoch() const {
+  return std::chrono::duration_cast<std::chrono::milliseconds>(*this->mEpoch).count();
+}
+void FileSelector::setEpoch(unsigned int epoch) {
+  this->mEpoch = std::chrono::milliseconds{epoch};
+  if (this->mDirectory && this->mEpoch)
+    this->update();
+  emit this->epochChanged();
+}
+
+QString FileSelector::seed() const {
+  return this->mSeed;
+}
+void FileSelector::setSeed(QString seed) {
+  this->mSeed = seed;
+  emit this->seedChanged();
+}
+
+QString FileSelector::selected() const {
+  if (!this->mDirectory || !this->mEpoch)
+    return QString();
+
+  std::vector<fs::path> shuffled(this->mFiles.begin(), this->mFiles.end());
+  std::sort(shuffled.begin(), shuffled.end());
+
+  auto currentTime = std::chrono::system_clock::now();
+  uint64_t currentEpoch = currentTime.time_since_epoch() / *this->mEpoch;
+  std::chrono::milliseconds timeInEpoch = std::chrono::duration_cast<std::chrono::milliseconds>(currentTime.time_since_epoch()) % *this->mEpoch;
+
+  std::ostringstream seed;
+  seed << this->mSeed.size() << ";" << this->mSeed.toStdString() << ";";
+  seed << *this->mEpoch << ";";
+  seed << currentEpoch << ";";
+  seed << this->mDirectory->string().size() << ";" << *this->mDirectory << ";";
+  seed << this->mFiles.size() << ";";
+  for (const fs::path& p: this->mFiles)
+    seed << p.string().size() << ";" << p << ";";
+
+  std::vector<std::seed_seq::result_type> v;
+  v.reserve(seed.str().size());
+  for (const char& c: seed.str())
+    v.push_back(c);
+
+  std::seed_seq engine_seed(v.begin(), v.end());
+  std::mt19937 g(engine_seed);
+  std::shuffle(shuffled.begin(), shuffled.end(), g);
+
+  std::vector<fs::path>::size_type ix = shuffled.size() * timeInEpoch / *this->mEpoch;
+  return QString::fromStdString((*this->mDirectory / shuffled[ix]).string());
+}
+
+void FileSelector::onTimeout() {
+  if (!this->mFiles.size())
+    return;
+
+  auto currentTime = std::chrono::system_clock::now();
+  uint64_t currentMinorEpoch = currentTime.time_since_epoch() / (*this->mEpoch / this->mFiles.size());
+  auto nextTime = std::chrono::time_point<std::chrono::system_clock>((2 * currentMinorEpoch + 3) * (*this->mEpoch / (this->mFiles.size() * 2)));
+  this->timer.start(std::chrono::duration_cast<std::chrono::milliseconds>(nextTime - currentTime).count());
+
+  emit this->selectedChanged();
+}
+
+void FileSelector::update() {
+  this->mFiles = std::set<fs::path>{};
+  for (const fs::directory_entry& entry:
+         fs::recursive_directory_iterator(*this->mDirectory, fs::directory_options::follow_directory_symlink))
+    {
+      this->mFiles.insert(fs::relative(entry, *this->mDirectory));
+    }
+
+  this->onTimeout();
+}
diff --git a/accounts/gkleen@sif/shell/quickshell-plugins/FileSelector.hpp b/accounts/gkleen@sif/shell/quickshell-plugins/FileSelector.hpp
new file mode 100644
index 00000000..72c4f2a7
--- /dev/null
+++ b/accounts/gkleen@sif/shell/quickshell-plugins/FileSelector.hpp
@@ -0,0 +1,52 @@
+#pragma once
+
+#include <filesystem>
+#include <chrono>
+#include <set>
+#include <optional>
+
+#include <QObject>
+#include <QTimer>
+
+#include <qqmlintegration.h>
+
+class FileSelector : public QObject {
+  Q_OBJECT;
+  Q_PROPERTY(QString directory READ directory WRITE setDirectory NOTIFY directoryChanged REQUIRED);
+  Q_PROPERTY(unsigned int epoch READ epoch WRITE setEpoch NOTIFY epochChanged REQUIRED);
+  Q_PROPERTY(QString seed READ seed WRITE setSeed NOTIFY seedChanged);
+  Q_PROPERTY(QString selected READ selected NOTIFY selectedChanged);
+  QML_ELEMENT;
+
+public:
+  explicit FileSelector(QObject* parent = nullptr);
+
+  QString directory() const;
+  void setDirectory(QString directory);
+
+  unsigned int epoch() const;
+  void setEpoch(unsigned int epoch);
+
+  QString seed() const;
+  void setSeed(QString seed);
+
+  QString selected() const;
+
+signals:
+  void directoryChanged();
+  void epochChanged();
+  void seedChanged();
+  void selectedChanged();
+
+private slots:
+  void onTimeout();
+
+private:
+  std::optional<std::filesystem::path> mDirectory;
+  std::optional<std::chrono::milliseconds> mEpoch;
+  std::set<std::filesystem::path> mFiles;
+  QString mSeed;
+  QTimer timer;
+
+  void update();
+};