#include "RecentBooksActivity.h"

#include <GfxRenderer.h>
#include <SDCardManager.h>

#include "MappedInputManager.h"
#include "RecentBooksStore.h"
#include "components/UITheme.h"
#include "fontIds.h"
#include "util/StringUtils.h"

namespace {
constexpr int SKIP_PAGE_MS = 700;
constexpr unsigned long GO_HOME_MS = 1000;
}  // namespace

void RecentBooksActivity::taskTrampoline(void* param) {
  auto* self = static_cast<RecentBooksActivity*>(param);
  self->displayTaskLoop();
}

void RecentBooksActivity::loadRecentBooks() {
  recentBooks.clear();
  const auto& books = RECENT_BOOKS.getBooks();
  recentBooks.reserve(books.size());

  for (const auto& book : books) {
    // Skip if file no longer exists
    if (!SdMan.exists(book.path.c_str())) {
      continue;
    }
    recentBooks.push_back(book);
  }
}

void RecentBooksActivity::onEnter() {
  Activity::onEnter();

  renderingMutex = xSemaphoreCreateMutex();

  // Load data
  loadRecentBooks();

  selectorIndex = 0;
  updateRequired = true;

  xTaskCreate(&RecentBooksActivity::taskTrampoline, "RecentBooksActivityTask",
              4096,               // Stack size
              this,               // Parameters
              1,                  // Priority
              &displayTaskHandle  // Task handle
  );
}

void RecentBooksActivity::onExit() {
  Activity::onExit();

  // Wait until not rendering to delete task to avoid killing mid-instruction to EPD
  xSemaphoreTake(renderingMutex, portMAX_DELAY);
  if (displayTaskHandle) {
    vTaskDelete(displayTaskHandle);
    displayTaskHandle = nullptr;
  }
  vSemaphoreDelete(renderingMutex);
  renderingMutex = nullptr;

  recentBooks.clear();
}

void RecentBooksActivity::loop() {
  const bool upReleased = mappedInput.wasReleased(MappedInputManager::Button::Left) ||
                          mappedInput.wasReleased(MappedInputManager::Button::Up);
  ;
  const bool downReleased = mappedInput.wasReleased(MappedInputManager::Button::Right) ||
                            mappedInput.wasReleased(MappedInputManager::Button::Down);

  const bool skipPage = mappedInput.getHeldTime() > SKIP_PAGE_MS;
  const int pageItems = UITheme::getNumberOfItemsPerPage(renderer, true, true, true);

  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
    if (!recentBooks.empty() && selectorIndex < static_cast<int>(recentBooks.size())) {
      Serial.printf("Selected recent book: %s\n", recentBooks[selectorIndex].path.c_str());
      onSelectBook(recentBooks[selectorIndex].path);
      return;
    }
  }

  if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
    onGoHome();
  }

  int listSize = static_cast<int>(recentBooks.size());
  if (upReleased) {
    if (skipPage) {
      selectorIndex = ((selectorIndex / pageItems - 1) * pageItems + listSize) % listSize;
    } else {
      selectorIndex = (selectorIndex + listSize - 1) % listSize;
    }
    updateRequired = true;
  } else if (downReleased) {
    if (skipPage) {
      selectorIndex = ((selectorIndex / pageItems + 1) * pageItems) % listSize;
    } else {
      selectorIndex = (selectorIndex + 1) % listSize;
    }
    updateRequired = true;
  }
}

void RecentBooksActivity::displayTaskLoop() {
  while (true) {
    if (updateRequired) {
      updateRequired = false;
      xSemaphoreTake(renderingMutex, portMAX_DELAY);
      render();
      xSemaphoreGive(renderingMutex);
    }
    vTaskDelay(10 / portTICK_PERIOD_MS);
  }
}

void RecentBooksActivity::render() const {
  renderer.clearScreen();

  const auto pageWidth = renderer.getScreenWidth();
  const auto pageHeight = renderer.getScreenHeight();
  auto metrics = UITheme::getMetrics();

  UITheme::drawHeader(renderer, Rect{0, metrics.topPadding, pageWidth, metrics.headerHeight}, "Recent Books");

  const int contentTop = metrics.topPadding + metrics.headerHeight + metrics.verticalSpacing;
  const int contentHeight = pageHeight - contentTop - metrics.buttonHintsHeight - metrics.verticalSpacing * 2;

  // Recent tab
  if (recentBooks.empty()) {
    renderer.drawText(UI_10_FONT_ID, metrics.contentSidePadding, contentTop + 20, "No recent books");
  } else {
    UITheme::drawList(
        renderer, Rect{0, contentTop, pageWidth, contentHeight}, recentBooks.size(), selectorIndex,
        [this](int index) { return recentBooks[index].title; }, false, nullptr, false, nullptr);
  }

  // Help text
  const auto labels = mappedInput.mapLabels("« Home", "Open", "Up", "Down");
  UITheme::drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);

  renderer.displayBuffer();
}