// pdf-generator.js — Cuatro PDFs A4 en blanco/negro con jsPDF (UMD global).

const { jsPDF } = window.jspdf;

const PAGE_W = 210; // mm
const PAGE_H = 297; // mm
const MARGIN = 20;  // mm
const CONTENT_W = PAGE_W - MARGIN * 2;
const FOOTER_LABEL = 'Tramoya · Angel E. Pariente';

export function pdfScript(json) {
  const doc = new jsPDF({ unit: 'mm', format: 'a4' });
  const title = json.title_page?.title || 'Guión sin título';

  drawHeader(doc, title, 'JSON estructurado');

  doc.setFont('courier', 'normal');
  doc.setFontSize(9);

  const text = JSON.stringify(json, null, 2);
  const lines = doc.splitTextToSize(text, CONTENT_W);

  let y = MARGIN + 14;
  const lineHeight = 3.6;
  const bottom = PAGE_H - MARGIN - 10;

  for (const line of lines) {
    if (y > bottom) {
      drawFooter(doc);
      doc.addPage();
      drawHeader(doc, title, 'JSON estructurado');
      doc.setFont('courier', 'normal');
      doc.setFontSize(9);
      y = MARGIN + 14;
    }
    doc.text(line, MARGIN, y);
    y += lineHeight;
  }

  drawFooter(doc);
  return doc;
}

export function pdfSceneMap(sceneMap, title) {
  const doc = new jsPDF({ unit: 'mm', format: 'a4' });
  drawHeader(doc, title, 'Mapa de escenas');

  const cols = [
    { key: 'number', label: '#', w: 12 },
    { key: 'heading', label: 'Encabezado', w: 78 },
    { key: 'characters', label: 'Personajes', w: 50 },
    { key: 'page', label: 'Pág.', w: 20 }
  ];

  let y = MARGIN + 14;
  const rowPadding = 2;

  // Cabeceras
  doc.setFont('helvetica', 'bold');
  doc.setFontSize(10);
  let x = MARGIN;
  for (const c of cols) {
    doc.text(c.label, x, y);
    x += c.w;
  }
  y += 2;
  doc.setLineWidth(0.2);
  doc.line(MARGIN, y, MARGIN + CONTENT_W, y);
  y += 4;

  doc.setFont('helvetica', 'normal');
  doc.setFontSize(9);

  for (const scene of sceneMap) {
    const headingLines = doc.splitTextToSize(scene.heading || '', cols[1].w - 2);
    const charsText = (scene.characters_present || []).join(', ');
    const charsLines = doc.splitTextToSize(charsText, cols[2].w - 2);
    const rowH = Math.max(headingLines.length, charsLines.length, 1) * 4 + rowPadding;

    if (y + rowH > PAGE_H - MARGIN - 10) {
      drawFooter(doc);
      doc.addPage();
      drawHeader(doc, title, 'Mapa de escenas');
      y = MARGIN + 14;
      doc.setFont('helvetica', 'bold');
      doc.setFontSize(10);
      let xh = MARGIN;
      for (const c of cols) {
        doc.text(c.label, xh, y);
        xh += c.w;
      }
      y += 2;
      doc.line(MARGIN, y, MARGIN + CONTENT_W, y);
      y += 4;
      doc.setFont('helvetica', 'normal');
      doc.setFontSize(9);
    }

    let xc = MARGIN;
    doc.text(String(scene.number), xc, y);
    xc += cols[0].w;
    doc.text(headingLines, xc, y);
    xc += cols[1].w;
    doc.text(charsLines, xc, y);
    xc += cols[2].w;
    doc.text(scene.start_page != null ? String(scene.start_page) : '—', xc, y);

    y += rowH;
  }

  drawFooter(doc);
  return doc;
}

export function pdfCharacters(report, title) {
  const doc = new jsPDF({ unit: 'mm', format: 'a4' });
  drawHeader(doc, title, 'Personajes');

  let y = MARGIN + 14;
  const bottom = PAGE_H - MARGIN - 10;

  for (const c of report) {
    const blockLines = [];
    blockLines.push({ text: c.name, bold: true, size: 13 });
    blockLines.push({
      text: `Diálogos: ${c.dialogue_count} · Palabras: ${c.total_words_spoken} · Escenas: ${c.scene_appearances.length}`,
      size: 10
    });
    blockLines.push({
      text: `Aparece de la escena ${c.first_appearance_scene} a la ${c.last_appearance_scene}.`,
      size: 10
    });
    blockLines.push({
      text: `Escenas: ${c.scene_appearances.join(', ')}`,
      size: 10
    });

    const co = Object.entries(c.scenes_with_other_characters || {})
      .sort((a, b) => b[1] - a[1])
      .slice(0, 8)
      .map(([n, k]) => `${n} (${k})`)
      .join(', ');
    if (co) {
      blockLines.push({ text: `Co-apariciones: ${co}`, size: 10 });
    }

    const estimatedH = blockLines.reduce((acc, b) => acc + (b.size === 13 ? 7 : 5), 0) + 6;
    if (y + estimatedH > bottom) {
      drawFooter(doc);
      doc.addPage();
      drawHeader(doc, title, 'Personajes');
      y = MARGIN + 14;
    }

    for (const b of blockLines) {
      doc.setFont('helvetica', b.bold ? 'bold' : 'normal');
      doc.setFontSize(b.size);
      const lines = doc.splitTextToSize(b.text, CONTENT_W);
      for (const line of lines) {
        if (y > bottom) {
          drawFooter(doc);
          doc.addPage();
          drawHeader(doc, title, 'Personajes');
          y = MARGIN + 14;
          doc.setFont('helvetica', b.bold ? 'bold' : 'normal');
          doc.setFontSize(b.size);
        }
        doc.text(line, MARGIN, y);
        y += b.size === 13 ? 6 : 4.5;
      }
    }
    y += 4;
    doc.setLineWidth(0.1);
    doc.setDrawColor(220, 220, 220);
    doc.line(MARGIN, y, MARGIN + CONTENT_W, y);
    doc.setDrawColor(0, 0, 0);
    y += 4;
  }

  drawFooter(doc);
  return doc;
}

export function pdfScaleta(scaleta, title) {
  const doc = new jsPDF({ unit: 'mm', format: 'a4' });
  drawHeader(doc, title, 'Escaleta');

  let y = MARGIN + 14;
  const bottom = PAGE_H - MARGIN - 10;

  for (const item of scaleta) {
    const headingText = `${item.scene_number}. ${item.heading}`;
    const summaryText = item.beat_summary || '';

    doc.setFont('helvetica', 'bold');
    doc.setFontSize(11);
    const headLines = doc.splitTextToSize(headingText, CONTENT_W);

    doc.setFont('helvetica', 'normal');
    doc.setFontSize(10);
    const sumLines = summaryText ? doc.splitTextToSize(summaryText, CONTENT_W) : [];

    const blockH = headLines.length * 5.5 + sumLines.length * 4.5 + 6;

    if (y + blockH > bottom) {
      drawFooter(doc);
      doc.addPage();
      drawHeader(doc, title, 'Escaleta');
      y = MARGIN + 14;
    }

    doc.setFont('helvetica', 'bold');
    doc.setFontSize(11);
    for (const line of headLines) {
      doc.text(line, MARGIN, y);
      y += 5.5;
    }

    if (sumLines.length) {
      doc.setFont('helvetica', 'normal');
      doc.setFontSize(10);
      for (const line of sumLines) {
        doc.text(line, MARGIN, y);
        y += 4.5;
      }
    }

    y += 4;
  }

  drawFooter(doc);
  return doc;
}

// --- helpers ---------------------------------------------------------------

function drawHeader(doc, title, section) {
  doc.setFont('helvetica', 'bold');
  doc.setFontSize(10);
  doc.text(truncate(title, 80), MARGIN, MARGIN);

  doc.setFont('helvetica', 'normal');
  doc.setFontSize(9);
  doc.text(section, PAGE_W - MARGIN, MARGIN, { align: 'right' });

  doc.setLineWidth(0.3);
  doc.line(MARGIN, MARGIN + 4, PAGE_W - MARGIN, MARGIN + 4);
}

function drawFooter(doc) {
  const pageNumber = doc.internal.getNumberOfPages();
  doc.setFont('helvetica', 'normal');
  doc.setFontSize(8);
  doc.setTextColor(85, 85, 85);
  doc.text(FOOTER_LABEL, MARGIN, PAGE_H - MARGIN + 6);
  doc.text(String(pageNumber), PAGE_W - MARGIN, PAGE_H - MARGIN + 6, { align: 'right' });
  doc.setTextColor(0, 0, 0);
}

function truncate(s, n) {
  if (!s) return '';
  return s.length > n ? s.slice(0, n - 1) + '…' : s;
}