/**
 * Domain-specific knowledge for the agent loop.
 * Single source of truth — shared between server (managed API, MCP)
 * and extension (via import at build time).
 */

import { readFileSync } from "fs";
import { fileURLToPath } from "url";
import { dirname, join } from "path";

interface DomainEntry {
  domain: string;
  antiBot?: boolean;
  /** ISO date (YYYY-MM-DD) the golden tasks last passed. */
  lastVerified?: string | null;
  /** Path (relative to server/) to the YAML of golden tasks for this domain. */
  goldenTasks?: string | null;
  skill: string;
}

export type { DomainEntry };

// Load from shared JSON file
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
const DOMAIN_SKILLS: DomainEntry[] = JSON.parse(
  readFileSync(join(__dirname, "domain-skills.json"), "utf-8")
);

/**
 * Look up domain knowledge for a URL.
 * Returns the first matching entry, or null.
 */
export function getDomainSkill(url: string): DomainEntry | null {
  try {
    const hostname = new URL(url).hostname.toLowerCase();
    return DOMAIN_SKILLS.find(
      (d) => hostname === d.domain || hostname.endsWith("." + d.domain)
    ) || null;
  } catch {
    // URL might not be a full URL — try matching as a bare domain
    const lower = url.toLowerCase();
    return DOMAIN_SKILLS.find(
      (d) => lower.includes(d.domain)
    ) || null;
  }
}

/**
 * Get all domain skills. Used by extension to import the full list.
 */
export function getAllDomainSkills(): DomainEntry[] {
  return DOMAIN_SKILLS;
}