import { mkdirSync, writeFileSync } from 'node:fs';
import { dirname, join, sep } from 'node:path';
import { createServer } from 'vite';

const outputPath = process.argv[2] ?? join('tmp', 'battle-map-v2-runtime-data.json');
const battleAssetMarker = '/src/assets/images/battle/';

const server = await createServer({
  logLevel: 'error',
  server: { middlewareMode: true },
  appType: 'custom'
});

try {
  const { battleScenarios } = await server.ssrLoadModule('/src/game/data/battles.ts');
  const { battleMapAssets } = await server.ssrLoadModule('/src/game/data/battleMapAssets.ts');

  const battles = Object.values(battleScenarios).map((scenario, index) => {
    const assetUrl = battleMapAssets[scenario.mapTextureKey];
    const markerIndex = typeof assetUrl === 'string' ? assetUrl.indexOf(battleAssetMarker) : -1;
    if (markerIndex < 0) {
      throw new Error(`${scenario.id}: cannot resolve battle map asset URL ${JSON.stringify(assetUrl)}`);
    }

    const fileName = assetUrl.slice(markerIndex + battleAssetMarker.length);
    return {
      number: index + 1,
      id: scenario.id,
      title: scenario.title,
      mapTextureKey: scenario.mapTextureKey,
      assetPath: join('src', 'assets', 'images', 'battle', fileName).split(sep).join('/'),
      width: scenario.map.width,
      height: scenario.map.height,
      terrain: scenario.map.terrain,
      units: scenario.units.map((unit) => ({
        id: unit.id,
        faction: unit.faction,
        x: unit.x,
        y: unit.y
      }))
    };
  });

  mkdirSync(dirname(outputPath), { recursive: true });
  writeFileSync(outputPath, `${JSON.stringify({ generatedAt: new Date().toISOString(), battles }, null, 2)}\n`, 'utf8');
  console.log(`Wrote ${outputPath} with ${battles.length} runtime battle maps.`);
} finally {
  await server.close();
}