/**
 * Skill indexing utility
 * Shared between worker and CLI commands
 */

import type { SourceFormat } from 'skillhub-core';
import { createDb, skillQueries, categoryQueries, type Database } from '@skillhub/db';
import type { GitHubCrawler } from './crawler.js';
import { SkillAnalyzer } from './analyzer.js';
import { syncSkillToMeilisearch } from './meilisearch-sync.js';

let db: Database | null = null;

function getDb(): Database {
  if (!db) {
    db = createDb(process.env.DATABASE_URL);
  }
  return db;
}

/**
 * Index a single skill from a GitHub source
 */
export async function indexSkill(
  crawler: GitHubCrawler,
  source: { owner: string; repo: string; path: string; branch: string; sourceFormat?: SourceFormat },
  force = false
): Promise<string | null> {
  const database = getDb();
  const analyzer = new SkillAnalyzer();
  const sourceFormat = source.sourceFormat || 'skill.md';

  // Fetch skill content
  console.log(`Fetching ${source.owner}/${source.repo}/${source.path} [${sourceFormat}]...`);
  const content = await crawler.fetchSkillContent(source);

  // Analyze the skill with format awareness
  const analysis = await analyzer.analyze(content, sourceFormat);

  // Skip invalid skills
  if (!analysis.validation.isValid) {
    console.log(`Skipping invalid skill: ${analysis.validation.errors.map((e) => e.message).join(', ')}`);
    return null;
  }

  // Generate skill ID with format suffix for non-SKILL.md
  const skillName = analysis.skill.metadata.name || source.path.split('/').pop() || 'skill';
  const formatSuffix = sourceFormat !== 'skill.md' ? `~${sourceFormat.replace('.', '')}` : '';
  const skillId = `${source.owner}/${source.repo}/${skillName}${formatSuffix}`;

  // Check if skill is blocked (owner requested removal)
  const existing = await skillQueries.getById(database, skillId);
  if (existing?.isBlocked) {
    console.log(`Skill ${skillId} is blocked, skipping`);
    return null;
  }

  // Check if we need to update (unless force)
  if (!force) {
    if (existing && existing.contentHash === analysis.meta.contentHash) {
      console.log(`Skill ${skillId} unchanged, skipping`);
      return null;
    }
  }

  // Upsert to database
  await skillQueries.upsert(database, {
    id: skillId,
    name: analysis.skill.metadata.name,
    description: analysis.skill.metadata.description,
    githubOwner: source.owner,
    githubRepo: source.repo,
    skillPath: source.path,
    branch: source.branch || content.repoMeta.defaultBranch,
    sourceFormat,
    version: analysis.skill.metadata.version,
    license: analysis.skill.metadata.license || content.repoMeta.license,
    author: analysis.skill.metadata.author,
    homepage: analysis.skill.metadata.homepage,
    compatibility: analysis.skill.metadata.compatibility,
    triggers: analysis.skill.metadata.triggers,
    githubStars: content.repoMeta.stars,
    githubForks: content.repoMeta.forks,
    securityScore: analysis.security.score,
    contentHash: analysis.meta.contentHash,
    rawContent: content.skillMd,
    indexedAt: new Date(),
  });

  // Sync to Meilisearch (optional - continues even if fails)
  await syncSkillToMeilisearch({
    id: skillId,
    name: analysis.skill.metadata.name,
    description: analysis.skill.metadata.description,
    githubOwner: source.owner,
    githubRepo: source.repo,
    compatibility: analysis.skill.metadata.compatibility,
    githubStars: content.repoMeta.stars,
    securityScore: analysis.security.score,
    indexedAt: new Date(),
  });

  // Link skill to categories based on keywords
  try {
    const categories = await categoryQueries.linkSkillToCategories(
      database,
      skillId,
      analysis.skill.metadata.name,
      analysis.skill.metadata.description || ''
    );
    console.log(`  -> Categories: [${categories.join(', ')}]`);
  } catch (error) {
    console.warn(`  -> Failed to link categories:`, error);
  }

  console.log(`Indexed: ${skillId} [${sourceFormat}] (security: ${analysis.security.score}, quality: ${analysis.quality.overall})`);

  return skillId;
}