import type { SkillInfo, SkillVisibilityScope } from './types';

import { syncSkillMarkdownFrontmatter } from './skill-markdown';

/** Build a hidden, standards-compliant canonical name for a new Skill. */
export function createSkillCanonicalName(
  displayName: string,
  suffix = createRandomSuffix(),
): string {
  const slug = displayName
    .normalize('NFKD')
    .toLowerCase()
    .replaceAll(/[^a-z0-9]+/g, '-')
    .replaceAll(/^-+|-+$/g, '')
    .slice(0, 48)
    .replaceAll(/-+$/g, '');
  const prefix = slug || 'skill';
  return `${prefix}-${suffix}`.slice(0, 64).replaceAll(/-+$/g, '');
}

/** Create the minimal valid package accepted by the Skill draft endpoint. */
export function buildInitialSkillDraft(input: {
  categoryId?: number | string;
  displayName: string;
  visibilityScope: SkillVisibilityScope;
}): SkillInfo {
  const displayName = input.displayName.trim();
  const name = createSkillCanonicalName(displayName);
  const content = syncSkillMarkdownFrontmatter(
    '# Instructions\n\n',
    name,
    displayName,
  );
  return {
    categoryId: input.categoryId || undefined,
    description: displayName,
    displayName,
    name,
    publishStatus: 'DRAFT',
    skillContent: content,
    visibilityScope: input.visibilityScope,
  };
}

function createRandomSuffix() {
  const uuid = globalThis.crypto?.randomUUID?.().replaceAll('-', '');
  if (uuid) return uuid.slice(0, 10);
  return Math.random().toString(36).slice(2, 12).padEnd(10, '0');
}