/* Generates src/icons.generated.ts from the simple-icons npm package —
   build-time only, so the site never phones a CDN (v1 loaded brand logos
   from cdn.simpleicons.org at runtime: a third-party request on a privacy
   guide). The slug list is DERIVED from the data files (tools.json +
   directory.json iconSlug fields) so it can never drift from the content.
   Slugs missing from the installed set fall back to the letter tile at
   render time. Run: pnpm icons */
import { readFileSync, writeFileSync } from 'node:fs'
import * as icons from 'simple-icons'

const dataFiles = ['../src/data/tools.json', '../src/data/directory.json']
const slugs = new Set(['github']) // footer link icon
for (const file of dataFiles) {
  const entries = JSON.parse(readFileSync(new URL(file, import.meta.url), 'utf8'))
  for (const entry of entries) {
    if (entry.iconSlug) slugs.add(entry.iconSlug)
  }
}

const bySlug = new Map(Object.values(icons).map((i) => [i.slug, i]))
const found = []
const missing = []
for (const slug of [...slugs].sort()) {
  const icon = bySlug.get(slug)
  if (icon) found.push(icon)
  else missing.push(slug)
}

const lines = found.map((i) => `  ${JSON.stringify(i.slug)}: ${JSON.stringify(i.path)},`)
const out = `/* AUTO-GENERATED by scripts/gen-icons.mjs — do not edit.
   SVG path data from the simple-icons npm package (CC0), inlined at build
   time. Zero runtime CDN request. Missing slugs at generation time: ${
     missing.length ? missing.join(', ') : 'none'
   }. */
export const BRAND_ICONS: Record<string, string> = {
${lines.join('\n')}
}
`
writeFileSync(new URL('../src/icons.generated.ts', import.meta.url), out)
console.log(
  `icons: ${found.length} embedded, ${missing.length} missing${missing.length ? ` (${missing.join(', ')})` : ''}`,
)

// Brand tile colors as a GENERATED STYLESHEET (not inline style attributes:
// the production CSP is style-src 'self', which blocks style= attributes).
// Tile ink is picked by WCAG contrast against the brand color — white ink
// fails on several light brands.
function luminance(hex) {
  const n = hex.replace('#', '')
  const [r, g, b] = [0, 2, 4].map((i) => {
    const c = parseInt(n.slice(i, i + 2), 16) / 255
    return c <= 0.04045 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4
  })
  return 0.2126 * r + 0.7152 * g + 0.0722 * b
}
function inkFor(hex) {
  const L = luminance(hex)
  return 1.05 / (L + 0.05) >= (L + 0.05) / 0.05 ? '#faf7ee' : '#14161a'
}

const tools = JSON.parse(readFileSync(new URL('../src/data/tools.json', import.meta.url), 'utf8'))
const rules = tools
  .filter((t) => t.color)
  .map((t) => `#${t.id} .tool-logo {\n  background: ${t.color};\n  color: ${inkFor(t.color)};\n}`)
const css = `/* AUTO-GENERATED by scripts/gen-icons.mjs — do not edit.
   Brand tile background + WCAG-picked ink per tool (from tools.json).
   A stylesheet, not style= attributes: the CSP (style-src 'self')
   blocks inline styles in production. */
${rules.join('\n')}
`
writeFileSync(new URL('../src/styles/brands.generated.css', import.meta.url), css)
console.log(`brands: ${rules.length} tile rules → src/styles/brands.generated.css`)