/**
 * Render a {@link BrandDefinitionArtifact} into the prose `BRAND — …` line the
 * filmmaking-prompts composer appends to each scene packet (after the
 * canonical 10-block body and after any DIRECTOR addendum, so it never
 * disturbs the Seedance block-order contract).
 *
 * Pure, deterministic, and intentionally PROSE-ONLY: palette colors render by
 * their authored names (never hex numerals) so the line passes the prompt-lint
 * prose-register check; unnamed colors are simply skipped.
 */

import { BRAND_PALETTE_ROLES, type BrandDefinitionArtifact } from './brand-definition.js';

function clause(label: string, value: string): string {
  return value.trim() ? `${label}: ${value.trim()}.` : '';
}

export function renderBrandLine(brand: BrandDefinitionArtifact): string {
  const paletteNames = BRAND_PALETTE_ROLES.map((role) => brand.palette[role]?.name ?? '')
    .filter(Boolean)
    .join(', ');
  const parts = [
    clause('Wordmark', brand.brandName),
    clause('Palette', paletteNames),
    clause('Voice', brand.voice.tone),
  ].filter(Boolean);
  return parts.length > 0 ? `BRAND — ${parts.join(' ')}` : '';
}