// Serializes a level data object (as produced by levelBuilder.js) into the
// literal `export default {...}` JS module source text the game expects to
// find in src/data/levels/levelNN.js. Numbers are emitted as plain scaled
// literals rather than `N * WORLD_SCALE` expressions - levelBuilder.js has
// already fully resolved them, and level03.js already sets precedent for a
// level file built from computed literal points rather than hand-picked
// base-unit expressions.

function pointsLiteral(points, indent) {
  const lines = points.map((p) => `${indent}  { x: ${p.x}, y: ${p.y} },`);
  return `[\n${lines.join('\n')}\n${indent}]`;
}

function terrainLiteral(terrain) {
  const segments = terrain.map((segment) => `    { points: ${pointsLiteral(segment.points, '    ')} },`);
  return `[\n${segments.join('\n')}\n  ]`;
}

function rectLiteral(rect) {
  return `{ x: ${rect.x}, y: ${rect.y}, width: ${rect.width}, height: ${rect.height} }`;
}

// Smashable item placements (editor "Smashables" section) - one literal
// object per item, same field order as levelBuilder.js emits them.
function itemsLiteral(items) {
  if (!items || items.length === 0) return '[]';
  const lines = items.map(
    (it) => `    { type: ${JSON.stringify(it.type)}, mode: ${JSON.stringify(it.mode)}, x: ${it.x}, y: ${it.y} },`
  );
  return `[\n${lines.join('\n')}\n  ]`;
}

export function exportLevelToSource(levelData) {
  const lines = [
    '// Generated by editor.html - review before dropping into src/data/levels/.',
    'export default {',
    `  id: ${JSON.stringify(levelData.id)},`,
    `  name: ${JSON.stringify(levelData.name)},`,
    `  description: ${JSON.stringify(levelData.description)},`,
    `  kidsAboard: ${levelData.kidsAboard},`,
    `  timeLimit: ${levelData.timeLimit},`,
    `  startPosition: { x: ${levelData.startPosition.x}, y: ${levelData.startPosition.y} },`,
    `  startAngle: ${levelData.startAngle},`,
    `  terrain: ${terrainLiteral(levelData.terrain)},`,
    '  obstacles: [],',
    // Only emitted when the level actually has items - keeps hand-authored
    // levels' exports byte-identical to before this feature existed.
    ...(levelData.items && levelData.items.length > 0 ? [`  items: ${itemsLiteral(levelData.items)},`] : []),
    `  goal: ${rectLiteral(levelData.goal)},`,
    `  cameraBounds: ${rectLiteral(levelData.cameraBounds)},`,
    '};',
    '',
  ];
  return lines.join('\n');
}