import { listSlides, createSlide, deleteSlide } from './api.js';
import { getEditorValues } from './editors.js';
import { renderPreview } from './preview.js';
import { compileCss } from './preprocessors.js';
import { compileJs } from './js-preprocessors.js';
import { getCurrentMode, getCssType } from './editors.js';
import { getPref } from './preferences.js';

let slides = [];
let currentSlideIndex = 0;
let isPresenting = false;

const $ = (sel) => document.querySelector(sel);

function showToast(msg) {
  const toast = $('#share-toast');
  if (!toast) return;
  toast.textContent = msg;
  toast.classList.remove('hidden');
  setTimeout(() => toast.classList.add('hidden'), 3000);
}

export async function openSlideManager(fiddleId) {
  if (!fiddleId) {
    showToast('Save the fiddle first to use presentation mode');
    return;
  }

  const modal = $('#presentation-modal');
  modal.classList.remove('hidden');

  try {
    const result = await listSlides(fiddleId);
    slides = result.slides || [];
    renderSlideList(fiddleId);
  } catch (e) {
    showToast('Failed to load slides: ' + e.message);
  }
}

function renderSlideList(fiddleId) {
  const list = $('#slide-list');
  list.innerHTML = '';

  if (!slides.length) {
    list.innerHTML = '<div style="padding:16px;color:var(--text-dim);text-align:center">No slides yet. Add the current editor state as a slide.</div>';
  } else {
    slides.forEach((slide, i) => {
      const item = document.createElement('div');
      item.className = 'slide-item';
      item.innerHTML = `
        <span class="slide-number">${i + 1}</span>
        <span class="slide-preview-text">${escHtml(slide.notes || slide.js.slice(0, 60) || slide.html.slice(0, 60) || '(empty)')}</span>
        <button class="slide-delete-btn btn-small" data-id="${slide.id}">&times;</button>
      `;
      list.appendChild(item);
    });

    list.querySelectorAll('.slide-delete-btn').forEach(btn => {
      btn.addEventListener('click', async (e) => {
        e.stopPropagation();
        try {
          await deleteSlide(btn.dataset.id);
          slides = slides.filter(s => s.id !== btn.dataset.id);
          renderSlideList(fiddleId);
        } catch (err) {
          showToast('Delete failed: ' + err.message);
        }
      });
    });
  }

  // Update slide count
  const countEl = $('#slide-count');
  if (countEl) countEl.textContent = `${slides.length} slide${slides.length !== 1 ? 's' : ''}`;
}

export async function addCurrentSlide(fiddleId) {
  if (!fiddleId) return;
  const { html, css, js } = getEditorValues();
  const notes = prompt('Slide notes (optional):') || '';
  try {
    const slide = await createSlide(fiddleId, { html, css, js, notes });
    slides.push(slide);
    renderSlideList(fiddleId);
    showToast(`Slide ${slides.length} added`);
  } catch (e) {
    showToast('Failed to add slide: ' + e.message);
  }
}

export async function startPresentation(fiddleId) {
  if (!fiddleId) {
    showToast('Save the fiddle first');
    return;
  }

  try {
    const result = await listSlides(fiddleId);
    slides = result.slides || [];
  } catch (e) {
    showToast('Failed to load slides: ' + e.message);
    return;
  }

  if (!slides.length) {
    showToast('Add at least one slide first');
    return;
  }

  isPresenting = true;
  currentSlideIndex = 0;

  const overlay = $('#presentation-overlay');
  overlay.classList.remove('hidden');

  // Close the manager modal if open
  $('#presentation-modal').classList.add('hidden');

  renderCurrentSlide();
  document.addEventListener('keydown', presentationKeyHandler);
}

export function stopPresentation() {
  isPresenting = false;
  const overlay = $('#presentation-overlay');
  overlay.classList.add('hidden');
  document.removeEventListener('keydown', presentationKeyHandler);
}

function presentationKeyHandler(e) {
  if (!isPresenting) return;
  if (e.key === 'Escape') {
    e.preventDefault();
    stopPresentation();
  } else if (e.key === 'ArrowRight' || e.key === 'ArrowDown' || e.key === ' ') {
    e.preventDefault();
    if (currentSlideIndex < slides.length - 1) {
      currentSlideIndex++;
      renderCurrentSlide();
    }
  } else if (e.key === 'ArrowLeft' || e.key === 'ArrowUp') {
    e.preventDefault();
    if (currentSlideIndex > 0) {
      currentSlideIndex--;
      renderCurrentSlide();
    }
  }
}

async function renderCurrentSlide() {
  const slide = slides[currentSlideIndex];
  if (!slide) return;

  const counter = $('#pres-counter');
  counter.textContent = `${currentSlideIndex + 1} / ${slides.length}`;

  const notes = $('#pres-notes');
  notes.textContent = slide.notes || '';

  // Render the slide's code into the presentation iframe
  const frame = $('#pres-preview-frame');
  const mode = getCurrentMode();
  const cssType = getCssType();

  try {
    const compiledCss = await compileCss(slide.css, cssType);
    const result = await compileJs(slide.js, mode);

    const { getFrameworkRuntime } = await import('./js-preprocessors.js');
    const runtime = getFrameworkRuntime(mode);
    const allCss = result.extraCss ? `${compiledCss}\n${result.extraCss}` : compiledCss;

    const finalHtml = result.renderedHtml || slide.html;
    const finalJs = result.renderedHtml ? '' : result.js;

    let bodyContent;
    if (mode === 'vue' || mode === 'svelte') {
      bodyContent = finalHtml ? `${finalHtml}\n${runtime.bodyHtml}` : runtime.bodyHtml;
    } else if (runtime.bodyHtml) {
      bodyContent = `${finalHtml}\n${runtime.bodyHtml}`;
    } else {
      bodyContent = finalHtml;
    }

    const isModule = result.isModule || mode === 'svelte';

    let scripts = '';
    if (finalJs) {
      if (isModule) {
        scripts = `<script type="module">\n${finalJs}\n<\/script>`;
      } else {
        for (const url of runtime.scripts) {
          scripts += `<script src="${url}"><\/script>\n`;
        }
        scripts += `<script>\n${finalJs}\n<\/script>`;
      }
    }

    const previewTheme = getPref('previewTheme');
    const darkCss = previewTheme === 'dark'
      ? `<style>body { background: #1e1e1e; color: #ccc; }</style>\n`
      : '';

    const doc = `<!DOCTYPE html>
<html><head><meta charset="UTF-8">${darkCss}<style>${allCss}</style></head>
<body>${bodyContent}${scripts}</body></html>`;

    frame.srcdoc = doc;
  } catch (e) {
    frame.srcdoc = `<pre style="color:red;padding:20px">Error: ${escHtml(e.message)}</pre>`;
  }
}

function escHtml(str) {
  return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
}