crosspoint-reader/src/activities/reader/TxtReaderActivity.h

#pragma once

#include <Txt.h>
#include <freertos/FreeRTOS.h>
#include <freertos/semphr.h>
#include <freertos/task.h>

#include <vector>

#include "CrossPointSettings.h"
#include "activities/ActivityWithSubactivity.h"

class TxtReaderActivity final : public ActivityWithSubactivity {
  std::unique_ptr<Txt> txt;
  TaskHandle_t displayTaskHandle = nullptr;
  SemaphoreHandle_t renderingMutex = nullptr;
  int currentPage = 0;
  int totalPages = 1;
  int pagesUntilFullRefresh = 0;
  bool updateRequired = false;
  const std::function<void()> onGoBack;
  const std::function<void()> onGoHome;

  // End-of-book prompt state
  bool showingEndOfBookPrompt = false;
  int endOfBookSelection = 2;  // 0=Archive, 1=Delete, 2=Keep

  // Streaming text reader - stores file offsets for each page
  std::vector<size_t> pageOffsets;  // File offset for start of each page
  std::vector<std::string> currentPageLines;
  int linesPerPage = 0;
  int viewportWidth = 0;
  bool initialized = false;

  // Cached settings for cache validation (different fonts/margins require re-indexing)
  int cachedFontId = 0;
  int cachedScreenMargin = 0;
  uint8_t cachedParagraphAlignment = CrossPointSettings::LEFT_ALIGN;

  static void taskTrampoline(void* param);
  [[noreturn]] void displayTaskLoop();
  void renderScreen();
  void renderPage();
  void renderStatusBar(int orientedMarginRight, int orientedMarginBottom, int orientedMarginLeft) const;
  void renderEndOfBookPrompt();
  void handleEndOfBookAction();

  void initializeReader();
  bool loadPageAtOffset(size_t offset, std::vector<std::string>& outLines, size_t& nextOffset);
  void buildPageIndex();
  bool loadPageIndexCache();
  void savePageIndexCache() const;
  void saveProgress() const;
  void loadProgress();
  int findPageForOffset(size_t targetOffset) const;

 public:
  explicit TxtReaderActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, std::unique_ptr<Txt> txt,
                             const std::function<void()>& onGoBack, const std::function<void()>& onGoHome)
      : ActivityWithSubactivity("TxtReader", renderer, mappedInput),
        txt(std::move(txt)),
        onGoBack(onGoBack),
        onGoHome(onGoHome) {}
  void onEnter() override;
  void onExit() override;
  void loop() override;
};