/* =========================================================
   manuales-factorpesca / manual.js
   Lógica de presentación del manual:
   - Genera el índice automático a partir de h1, h2, h3.
   - Dibuja anotaciones numeradas sobre las capturas.
   - Captura el nombre del capítulo actual para la cabecera.
   - Numera figuras y pasos (complementa a los CSS counters).
   - Prepara el contador de página tras la carga de fuentes.

   Este script NO añade interactividad: solo prepara el DOM
   para que Chromium imprima un PDF bien paginado.
   ========================================================= */

(function () {
  'use strict';

  document.addEventListener('DOMContentLoaded', init);

  function init() {
    if (document.fonts && document.fonts.ready) {
      document.fonts.ready.then(afterFonts);
    } else {
      afterFonts();
    }
  }

  function afterFonts() {
    try {
      buildTOC();
      renderAnnotations();
      setupChapterString();
      ensureAnchors();
      ensureImagePaths();
    } catch (err) {
      console.error('[manual.js] Error preparando el manual:', err);
    }
  }

  /* ---------------------------------------------------------
     1. Índice automático
     --------------------------------------------------------- */
  function buildTOC() {
    const out = document.querySelector('[data-toc-output]');
    if (!out) return;

    const chapters = document.querySelectorAll('[data-chapter]');
    if (!chapters.length) {
      out.innerHTML = '<li class="toc-empty">Sin capítulos definidos.</li>';
      return;
    }

    const frag = document.createDocumentFragment();
    let chapterIndex = 0;

    chapters.forEach((chapter) => {
      chapterIndex += 1;
      const title = chapter.querySelector('[data-chapter-title]') || chapter.querySelector('h1');
      if (!title) return;

      const li = document.createElement('li');
      li.className = 'toc-h1';
      li.appendChild(tocRow(romanize(chapterIndex) + '. ' + title.textContent.trim()));
      frag.appendChild(li);

      const subsections = chapter.querySelectorAll('h2');
      subsections.forEach((sub) => {
        const row = document.createElement('li');
        row.className = 'toc-h2';
        row.appendChild(tocRow('  ' + (sub.dataset.tocLabel || sub.textContent.trim())));
        frag.appendChild(row);
      });

      const subsub = chapter.querySelectorAll('h3');
      subsub.forEach((sub) => {
        const row = document.createElement('li');
        row.className = 'toc-h3';
        row.appendChild(tocRow('    ' + (sub.dataset.tocLabel || sub.textContent.trim())));
        frag.appendChild(row);
      });
    });

    out.innerHTML = '';
    out.appendChild(frag);
  }

  function tocRow(label) {
    const span = document.createElement('span');
    span.className = 'toc-row';
    const text = document.createElement('span');
    text.className = 'toc-text';
    text.textContent = label;
    const dots = document.createElement('span');
    dots.className = 'toc-dots';
    const num = document.createElement('span');
    num.className = 'toc-page-num';
    num.textContent = '—';
    span.appendChild(text);
    span.appendChild(dots);
    span.appendChild(num);
    return span;
  }

  function romanize(num) {
    const map = [
      ['M', 1000], ['CM', 900], ['D', 500], ['CD', 400],
      ['C', 100], ['XC', 90], ['L', 50], ['XL', 40],
      ['X', 10], ['IX', 9], ['V', 5], ['IV', 4], ['I', 1],
    ];
    let result = '';
    let n = num;
    for (const [letter, value] of map) {
      while (n >= value) {
        result += letter;
        n -= value;
      }
    }
    return result;
  }

  /* ---------------------------------------------------------
     2. Anotaciones sobre capturas
     --------------------------------------------------------- */
  function renderAnnotations() {
    document.querySelectorAll('.annotations[data-annotations]').forEach((list) => {
      let data = [];
      try {
        data = JSON.parse(list.getAttribute('data-annotations') || '[]');
      } catch (err) {
        console.warn('[manual.js] data-annotations inválido:', err);
        return;
      }
      if (!Array.isArray(data) || data.length === 0) {
        list.remove();
        return;
      }
      const sorted = data.slice().sort((a, b) => (a.n || 0) - (b.n || 0));
      sorted.forEach((entry) => {
        const li = document.createElement('li');
        li.className = 'annotation';
        li.textContent = String(entry.n);
        if (typeof entry.x === 'number' && typeof entry.y === 'number') {
          li.style.left = entry.x + '%';
          li.style.top = entry.y + '%';
        }
        if (entry.label) {
          li.setAttribute('aria-label', entry.label);
          li.setAttribute('title', entry.label);
        }
        list.appendChild(li);
      });
    });
  }

  /* ---------------------------------------------------------
     3. Cabecera dinámica con el nombre del capítulo actual
     --------------------------------------------------------- */
  function setupChapterString() {
    const chapters = document.querySelectorAll('[data-chapter]');
    chapters.forEach((chapter) => {
      const title = chapter.querySelector('[data-chapter-title]') || chapter.querySelector('h1');
      if (!title) return;
      title.setAttribute('data-string', title.textContent.trim());
    });
  }

  /* ---------------------------------------------------------
     4. Anclas automáticas para headings
     --------------------------------------------------------- */
  function ensureAnchors() {
    const headings = document.querySelectorAll('[data-chapter] h1, [data-chapter] h2, [data-chapter] h3, [data-chapter] h4');
    headings.forEach((h) => {
      if (!h.id) {
        const slug = (h.textContent || '')
          .toLowerCase()
          .normalize('NFD').replace(/[\u0300-\u036f]/g, '')
          .replace(/[^a-z0-9]+/g, '-')
          .replace(/(^-|-$)/g, '');
        h.id = slug || 'h-' + Math.random().toString(36).slice(2, 8);
      }
    });
  }

  /* ---------------------------------------------------------
     5. Resolver rutas de imágenes a absolutas
     --------------------------------------------------------- */
  function ensureImagePaths() {
    const base = window.location.href.replace(/[^/]*$/, '');
    document.querySelectorAll('img').forEach((img) => {
      const src = img.getAttribute('src');
      if (!src || src.startsWith('http') || src.startsWith('data:') || src.startsWith('file:')) return;
      const absolute = new URL(src, base).href;
      img.src = absolute;
    });
  }
})();