// Generates tonalmine/stylesheets/palettes.css: one M3 color scheme per seed color,
// in light and dark. Run: cd tools/palettes && npm install && npm run build
// The same build bundles scheme.mjs into tonalmine/javascripts/scheme.js for the custom color picker
// (bundled with esbuild because material-color-utilities 0.4.0 has extensionless ESM imports).
import { writeFileSync, readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { ROLES, kebab, paletteCss } from './scheme.mjs';

// The first palette is the default. Ids must match PALETTES in tonalmine/javascripts/theme.js
// and redmine_tonalmine/lib/redmine_tonalmine/appearance.rb.
// An optional third entry is a Material Theme Builder export folder (light.css, dark.css and the
// -mc/-hc contrast variants):
// its roles are copied as-is instead of generated, and the seed only drives success/warning.
const PALETTES = [
  ['purple', '#6750A4'],
  ['blue', '#0061A4'],
  ['green', '#386A20'],
  ['orange', '#8B5000'],
];

// Reads the roles from a Theme Builder export; fails if one is missing.
function exported(dir, dark, contrast) {
  const file = `${dir}/${dark ? 'dark' : 'light'}${{ medium: '-mc', high: '-hc' }[contrast] || ''}.css`;
  const vars = Object.fromEntries([...readFileSync(file, 'utf8').matchAll(/--md-sys-color-([a-z-]+):\s*([^;]+);/g)].map((m) => [m[1], m[2].trim()]));
  return ROLES.map((r) => {
    if (!vars[kebab(r)]) { console.error(`${file} is missing --md-sys-color-${kebab(r)}`); process.exit(1); }
    return `--md-sys-color-${kebab(r)}: ${vars[kebab(r)]};`;
  });
}

// Specificity: the default palette uses bare :root, the others add [data-palette], and every dark
// rule adds one more attribute, so "palette + mode" always beats "palette" and the default.
let css = `/*
 * Generated by tools/palettes/build_palettes.mjs; do not edit by hand.
 * M3 color roles (TonalSpot) per palette, light and dark, at contrast 0, 0.5 and 1.
 * <html data-palette="..."> picks the palette, <html data-mode="light|dark"> forces a mode;
 * without data-mode the OS setting (prefers-color-scheme) decides.
 * <html data-contrast="medium|high"> picks the contrast level; without it, standard.
 */

:root { color-scheme: light; }
:root[data-mode="dark"] { color-scheme: dark; }
@media (prefers-color-scheme: dark) { :root:not([data-mode="light"]) { color-scheme: dark; } }
`;
PALETTES.forEach(([id, seed, dir], i) => {
  const sel = i === 0 ? ':root' : `:root[data-palette="${id}"]`;
  css += `
/* ${id} (${dir ? `export ${dir}, ` : ''}seed ${seed}) */
` + paletteCss(sel, seed, dir && ((dark, contrast) => exported(dir, dark, contrast)));
});

// Paths are relative to tools/palettes (npm runs scripts there); the bundle itself lives in .build/.
const theme = resolve(process.cwd(), '../../tonalmine');
const out = `${theme}/stylesheets/palettes.css`;
writeFileSync(out, css);

// Keep theme.js and the plugin's validation in sync: every palette id must appear in their PALETTES lists.
const js = readFileSync(`${theme}/javascripts/theme.js`, 'utf8');
const missing = PALETTES.map(([id]) => id).filter((id) => !js.includes(`'${id}'`));
if (missing.length) { console.error(`theme.js is missing palettes: ${missing.join(', ')}`); process.exit(1); }
const rb = readFileSync(resolve(theme, '../redmine_tonalmine/lib/redmine_tonalmine/appearance.rb'), 'utf8');
const rbIds = rb.match(/PALETTES = %w\[([^\]]*)\]/)[1].split(/\s+/);
const rbMissing = PALETTES.map(([id]) => id).filter((id) => !rbIds.includes(id));
if (rbMissing.length) { console.error(`appearance.rb is missing palettes: ${rbMissing.join(', ')}`); process.exit(1); }
console.log(`Wrote ${PALETTES.length} palettes to ${out}`);