#!/usr/bin/env node

/**
 * Generate output HTML from template + data for cargo-filling documents.
 *
 * Usage: node generate.mjs <docId>
 * Example: node generate.mjs cargo-filling-1
 *
 * Reads:  docs/<docId>.template.html
 * Reads:  docs/<docId>.data.json (optional)
 * Writes: docs/<docId>.output.html
 *
 * data.json format:
 * {
 *   pages: [{
 *     page: 1,
 *     cards: [{
 *       index: 0,
 *       asteroidScale: 1.15,
 *       ship: { right: -10, top: -3, width: 85, height: 40 },
 *       innerAst: { left: 60, top: 70 }
 *     }]
 *   }]
 * }
 *
 * Transforms:
 * - asteroidScale: scale on .space-asteroid img, .remnant-shape .shape-container, .inner-ast
 * - ship: inline right/top/width/height on .cargo-ship
 * - innerAst: inline left/top on .inner-ast (composed with translate and optional scale)
 */

import { readFileSync, writeFileSync, existsSync } from 'fs';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';
import { postGenerate } from '../../../src/scripts/post-generate.mjs';

const __dirname = dirname(fileURLToPath(import.meta.url));
const docsDir = join(__dirname, '..', 'docs');

const docId = process.argv[2];
if (!docId) {
  console.error('Usage: node generate.mjs <docId>');
  process.exit(1);
}

const templatePath = join(docsDir, `${docId}.template.html`);
const dataPath = join(docsDir, `${docId}.data.json`);
const outputPath = join(docsDir, `${docId}.output.html`);

if (!existsSync(templatePath)) {
  console.error(`Template not found: ${templatePath}`);
  process.exit(1);
}

let html = readFileSync(templatePath, 'utf-8');

if (existsSync(dataPath)) {
  const data = JSON.parse(readFileSync(dataPath, 'utf-8'));
  html = applyData(html, data);
  console.log(`Applied data from ${data.pages?.length || 0} pages`);
}

writeFileSync(outputPath, html);
console.log(`Generated: ${outputPath}`);
await postGenerate(outputPath);

function applyData(html, data) {
  if (!data.pages) return html;

  // Split HTML into pages by w-[210mm] h-[297mm] divs
  const pageRegex = /<div class="w-\[210mm\] h-\[297mm\]/g;
  const starts = [];
  let match;
  while ((match = pageRegex.exec(html)) !== null) {
    starts.push(match.index);
  }
  if (starts.length === 0) return html;

  // Process pages in reverse to preserve indices
  for (let i = data.pages.length - 1; i >= 0; i--) {
    const pageData = data.pages[i];
    const pageNum = pageData.page || (i + 1);
    const pageIdx = pageNum - 1;
    if (pageIdx >= starts.length) continue;

    const pageStart = starts[pageIdx];
    const pageEnd = pageIdx + 1 < starts.length ? starts[pageIdx + 1] : html.length;
    let pageHtml = html.slice(pageStart, pageEnd);

    if (pageData.cards) {
      pageHtml = applyCards(pageHtml, pageData.cards);
    }

    html = html.slice(0, pageStart) + pageHtml + html.slice(pageEnd);
  }

  return html;
}

function applyCards(pageHtml, cards) {
  // Find card boundaries by <!-- Card comments (two formats: "Card 1:" and "Card:")
  const cardRegex = /<!-- Card[\s:]/g;
  const cardStarts = [];
  let match;
  while ((match = cardRegex.exec(pageHtml)) !== null) {
    cardStarts.push(match.index);
  }
  if (cardStarts.length === 0) return pageHtml;

  // Process cards in reverse to preserve indices
  for (let i = cards.length - 1; i >= 0; i--) {
    const cardData = cards[i];
    const cardIdx = cardData.index;
    if (cardIdx >= cardStarts.length) continue;

    const cardStart = cardStarts[cardIdx];
    const cardEnd = cardIdx + 1 < cardStarts.length
      ? cardStarts[cardIdx + 1]
      : pageHtml.length;

    let cardHtml = pageHtml.slice(cardStart, cardEnd);

    const scale = cardData.asteroidScale;
    const ship = cardData.ship;
    const innerAst = cardData.innerAst;

    // Apply asteroidScale to .space-asteroid img
    if (scale != null && scale !== 1) {
      // Match <div class="space-asteroid"> then find the <img inside
      cardHtml = cardHtml.replace(
        /(<div class="space-asteroid">[\s]*<img [^>]*?)(>)/,
        function(full, before, close) {
          // Remove any existing style, then add new one
          const cleaned = before.replace(/ style="[^"]*"/, '');
          return cleaned + ' style="transform: scale(' + scale + ')"' + close;
        }
      );
    }

    // Apply asteroidScale to .remnant-shape .shape-container
    if (scale != null && scale !== 1) {
      cardHtml = cardHtml.replace(
        /<div class="shape-container">/,
        '<div class="shape-container" style="transform: scale(' + scale + ')">'
      );
    }

    // Apply ship position/size to .cargo-ship
    if (ship) {
      const shipRight = ship.right != null ? ship.right : -12.5;
      const shipTop = ship.top != null ? ship.top : -5;
      const shipWidth = ship.width != null ? ship.width : 90;
      const shipHeight = ship.height != null ? ship.height : 42;
      const shipStyle = 'right: ' + shipRight + 'mm; top: ' + shipTop + 'mm; width: ' + shipWidth + 'mm; height: ' + shipHeight + 'mm';

      cardHtml = cardHtml.replace(
        /(<div class="cargo-ship")([\s>])/,
        function(full, tag, after) {
          return tag + ' style="' + shipStyle + '"' + after;
        }
      );
    }

    // Apply innerAst position (and compose with asteroidScale if present)
    if (innerAst || (scale != null && scale !== 1)) {
      const innerLeft = innerAst && innerAst.left != null ? innerAst.left : 58;
      const innerTop = innerAst && innerAst.top != null ? innerAst.top : 73;

      let transformPart = 'translate(-50%, -50%)';
      if (scale != null && scale !== 1) {
        transformPart = 'translate(-50%, -50%) scale(' + scale + ')';
      }

      let innerStyle = 'left: ' + innerLeft + '%; top: ' + innerTop + '%; transform: ' + transformPart;

      // Only apply if we actually have something to change
      const needsInnerChange = (innerAst && (innerAst.left != null || innerAst.top != null)) || (scale != null && scale !== 1);
      if (needsInnerChange) {
        cardHtml = cardHtml.replace(
          /(<div class="inner-ast")([\s>])/,
          function(full, tag, after) {
            return tag + ' style="' + innerStyle + '"' + after;
          }
        );
      }
    }

    pageHtml = pageHtml.slice(0, cardStart) + cardHtml + pageHtml.slice(cardEnd);
  }

  return pageHtml;
}