#include "SetTimezoneOffsetActivity.h"

#include <GfxRenderer.h>
#include <I18n.h>

#include <cstdio>
#include <cstdlib>

#include "CrossPointSettings.h"
#include "MappedInputManager.h"
#include "components/UITheme.h"
#include "fontIds.h"

void SetTimezoneOffsetActivity::onEnter() {
  Activity::onEnter();
  offsetHours = SETTINGS.timezoneOffsetHours;
  requestUpdate();
}

void SetTimezoneOffsetActivity::onExit() { Activity::onExit(); }

void SetTimezoneOffsetActivity::loop() {
  if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
    onBack();
    return;
  }

  if (mappedInput.wasPressed(MappedInputManager::Button::Confirm)) {
    SETTINGS.timezoneOffsetHours = offsetHours;
    SETTINGS.saveToFile();
    // Apply timezone immediately
    setenv("TZ", SETTINGS.getTimezonePosixStr(), 1);
    tzset();
    onBack();
    return;
  }

  if (mappedInput.wasPressed(MappedInputManager::Button::Up)) {
    if (offsetHours < 14) {
      offsetHours++;
      requestUpdate();
    }
    return;
  }

  if (mappedInput.wasPressed(MappedInputManager::Button::Down)) {
    if (offsetHours > -12) {
      offsetHours--;
      requestUpdate();
    }
    return;
  }
}

void SetTimezoneOffsetActivity::render(Activity::RenderLock&&) {
  renderer.clearScreen();

  const auto pageWidth = renderer.getScreenWidth();
  const int lineHeight12 = renderer.getLineHeight(UI_12_FONT_ID);

  // Title
  renderer.drawCenteredText(UI_12_FONT_ID, 20, tr(STR_SET_UTC_OFFSET), true, EpdFontFamily::BOLD);

  // Format the offset string
  char offsetStr[16];
  if (offsetHours >= 0) {
    snprintf(offsetStr, sizeof(offsetStr), "UTC+%d", offsetHours);
  } else {
    snprintf(offsetStr, sizeof(offsetStr), "UTC%d", offsetHours);
  }

  const int textWidth = renderer.getTextWidth(UI_12_FONT_ID, offsetStr);
  const int startX = (pageWidth - textWidth) / 2;
  const int valueY = 80;

  // Draw selection highlight
  constexpr int highlightPad = 10;
  renderer.fillRoundedRect(startX - highlightPad, valueY - 4, textWidth + highlightPad * 2, lineHeight12 + 8, 6,
                           Color::LightGray);

  // Draw the offset text
  renderer.drawText(UI_12_FONT_ID, startX, valueY, offsetStr, true);

  // Draw up/down arrows
  const int arrowX = pageWidth / 2;
  const int arrowUpY = valueY - 20;
  const int arrowDownY = valueY + lineHeight12 + 12;
  constexpr int arrowSize = 6;
  for (int row = 0; row < arrowSize; row++) {
    renderer.drawLine(arrowX - row, arrowUpY + row, arrowX + row, arrowUpY + row);
  }
  for (int row = 0; row < arrowSize; row++) {
    renderer.drawLine(arrowX - row, arrowDownY + arrowSize - 1 - row, arrowX + row, arrowDownY + arrowSize - 1 - row);
  }

  // Button hints
  const auto labels = mappedInput.mapLabels(tr(STR_BACK), tr(STR_SAVE), tr(STR_DIR_UP), tr(STR_DIR_DOWN));
  GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);

  renderer.displayBuffer();
}