import { state } from '../state';
import { displayTimeFromAbsolute, absoluteTimeFromDisplay } from '../timeline';
import { showControls } from '../controls';
import { saveProgress } from '../progress';
import { safeLocalStorage } from '../storage';

// button label based on segment type
const skipLabel = (type: string): string => (type === 'ed' ? 'Skip outro' : 'Skip intro');

/**
 * Updates skip button visibility and auto-skip logic.
 * Called on timeupdate. Shows button when in active segment.
 */
export const updateSkipButton = (currentTime: number): void => {
  const btn = state.container.querySelector('[data-skip]') as HTMLButtonElement | null;
  const displayTime = displayTimeFromAbsolute(currentTime);

  // find segment that contains current time (with delay buffer)
  const segment = state.activeSegments.find(s => {
    const delay = Math.min(1, Math.max(0.25, (s.end - s.start) * 0.02));
    return displayTime >= s.start + delay && displayTime < s.end;
  });

  if (!segment) {
    state.activeSkipSegment = null;
    btn?.classList.add('hidden');
    return;
  }

  // auto-skip: jump to end if enabled
  const autoSkip = safeLocalStorage.getItem('mal:autoskip-enabled') === 'true';
  if (autoSkip && displayTime >= segment.start && displayTime < segment.end) {
    state.video.currentTime = absoluteTimeFromDisplay(segment.end + 0.01);
    void saveProgress();
    return;
  }

  // show skip button
  state.activeSkipSegment = segment;
  if (btn) {
    btn.textContent = skipLabel(segment.type);
    btn.title = skipLabel(segment.type);
    btn.classList.remove('hidden');
  }
};

/**
 * Syncs autoskip checkbox with localStorage.
 */
export const updateAutoSkipButton = (): void => {
  const btn = document.querySelector('[data-autoskip]') as HTMLInputElement | null;
  if (!btn) return;
  btn.checked = safeLocalStorage.getItem('mal:autoskip-enabled') === 'true';
};

/**
 * Binds autoskip toggle change handler.
 */
export const setupSkip = (): void => {
  document.addEventListener('change', e => {
    const target = e.target as HTMLElement;
    if (target.hasAttribute('data-autoskip')) {
      safeLocalStorage.setItem(
        'mal:autoskip-enabled',
        (target as HTMLInputElement).checked ? 'true' : 'false'
      );
      showControls();
    }
  });
};