import { defineConfig } from 'astro/config';
import sitemap from '@astrojs/sitemap';
import { readdirSync, readFileSync, rmSync, statSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { join } from 'node:path';

// Astro emits every imported screenshot at full size even when pages only use the optimised
// WebP variants. Drop originals nothing links to, so a deploy isn't ~17 MB heavier than needed.
function pruneUnusedOriginals() {
  return {
    name: 'prune-unused-originals',
    hooks: {
      'astro:build:done': ({ dir }) => {
        const root = fileURLToPath(dir);
        const files = [];
        const walk = (d) => {
          for (const n of readdirSync(d)) {
            const p = join(d, n);
            statSync(p).isDirectory() ? walk(p) : files.push(p);
          }
        };
        walk(root);
        const text = files
          .filter((f) => /\.(html|css|js|xml|json|webmanifest)$/.test(f))
          .map((f) => readFileSync(f, 'utf8'))
          .join('\n');
        for (const f of files) {
          if (!/_astro[\\/][^\\/]+\.(png|jpe?g)$/.test(f)) continue;
          const name = f.split(/[\\/]/).pop();
          if (!text.includes(name)) rmSync(f);
        }
      },
    },
  };
}

// SITE_URL / BASE_PATH let CI set these without editing the file
// (e.g. a GitHub Pages project site: https://user.github.io + /ink-website).
export default defineConfig({
  site: process.env.SITE_URL ?? 'https://ink.example',
  base: process.env.BASE_PATH ?? '/',
  output: 'static',
  trailingSlash: 'always',
  integrations: [sitemap(), pruneUnusedOriginals()],
  build: { inlineStylesheets: 'auto' },
  // lightningcss merges `backdrop-filter` + `-webkit-backdrop-filter` into the prefixed one only,
  // which Chrome and Firefox ignore (no blur). esbuild leaves both declarations alone.
  vite: { build: { cssMinify: 'esbuild' } },
  devToolbar: { enabled: false },
});