/**
 * @module mcp-server/tools/lookup
 * MCP Tool: ASN, Prefix, and IX lookups.
 *
 * Provides unified lookups across PeeringDB, RIPE Stat, bgp.he.net, IRR,
 * and RPKI sources. Returns comprehensive network intelligence in a single call.
 */

import { z } from "zod";
import type { NetworkInfo, InternetExchange } from "../../types/common.js";
import { parseASN, formatASN } from "../../types/common.js";

// ── Tool Schemas ─────────────────────────────────────────

/** Input schema for ASN lookup */
export const asnLookupSchema = z.object({
  asn: z
    .union([z.string(), z.number()])
    .describe("ASN to look up (e.g., 13335 or 'AS13335')"),
  sources: z
    .array(
      z.enum([
        "peeringdb",
        "ripe_stat",
        "bgp_he",
        "irr",
        "rpki",
      ])
    )
    .optional()
    .describe("Data sources to query (default: all available)"),
});

/** Input schema for prefix lookup */
export const prefixLookupSchema = z.object({
  prefix: z
    .string()
    .describe("IP prefix to look up (e.g., '1.1.1.0/24' or '2606:4700::/32')"),
  include_bgp: z
    .boolean()
    .optional()
    .default(true)
    .describe("Include BGP routing data"),
  include_rpki: z
    .boolean()
    .optional()
    .default(true)
    .describe("Include RPKI validation status"),
});

/** Input schema for IX lookup */
export const ixLookupSchema = z.object({
  query: z
    .string()
    .describe(
      "IX name or ID to search for (e.g., 'DE-CIX Frankfurt', 'AMS-IX', or PeeringDB IX ID)"
    ),
  include_participants: z
    .boolean()
    .optional()
    .default(false)
    .describe("Include list of participants"),
});

// ── Tool Handlers ────────────────────────────────────────

/**
 * Look up comprehensive information for an ASN.
 *
 * Queries multiple data sources in parallel and merges results into a
 * unified NetworkInfo object.
 *
 * @param input - Validated lookup parameters
 * @returns Unified network information
 *
 * @example
 * ```
 * > Give me the full picture for AS13335
 *
 * Returns: Cloudflare info from PeeringDB + RIPE Stat + bgp.he.net + IRR + RPKI
 * ```
 */
export async function handleASNLookup(
  input: z.infer<typeof asnLookupSchema>
): Promise<NetworkInfo> {
  const asn = parseASN(input.asn);

  // TODO: Initialize source clients from server context
  // TODO: Check cache before querying sources
  // TODO: Query sources in parallel:
  //   - PeeringDB: network info, IX connections, facilities
  //   - RIPE Stat: AS overview, announced prefixes, visibility
  //   - bgp.he.net: peers, upstreams, downstreams
  //   - IRR: route objects, as-set
  //   - RPKI: ROA coverage, validation summary

  // Placeholder — will be populated from real source queries
  const result: NetworkInfo = {
    asn,
    name: "", // TODO: From PeeringDB
    aka: "",
    description: "", // TODO: From RIPE Stat AS overview
    website: "",
    lookingGlass: "",
    peeringPolicy: "open",
    networkType: "Content",
    scope: "Global",
    prefixCount4: 0, // TODO: From PeeringDB + RIPE Stat
    prefixCount6: 0,
    ixCount: 0,
    facilityCount: 0,
    irr: {
      asSet: "", // TODO: From IRR query
      routeObjects: [],
    },
    rpki: {
      roaCount: 0, // TODO: From RPKI validation
      coveragePercent: 0,
      validPrefixes: 0,
      invalidPrefixes: 0,
      unknownPrefixes: 0,
    },
    sources: ["peeringdb", "ripe_stat", "bgp_he", "irr", "rpki"],
    lastUpdated: new Date().toISOString(),
  };

  // TODO: Cache the merged result

  return result;
}

/**
 * Look up information for an IP prefix.
 *
 * Returns origin ASN, BGP routing details, RPKI validation state,
 * and IRR registration status.
 */
export async function handlePrefixLookup(
  input: z.infer<typeof prefixLookupSchema>
): Promise<{
  prefix: string;
  originASN: number;
  bgp: { pathCount: number; upstreams: ReadonlyArray<number> };
  rpki: { state: string; roaCount: number };
  irr: { registered: boolean; objects: ReadonlyArray<string> };
}> {
  // TODO: Implement prefix lookup across sources
  return {
    prefix: input.prefix,
    originASN: 0,
    bgp: { pathCount: 0, upstreams: [] },
    rpki: { state: "unknown", roaCount: 0 },
    irr: { registered: false, objects: [] },
  };
}

/**
 * Look up Internet Exchange information.
 *
 * Searches PeeringDB for IX details and optionally includes participant list.
 */
export async function handleIXLookup(
  input: z.infer<typeof ixLookupSchema>
): Promise<{
  ix: InternetExchange | null;
  participants?: ReadonlyArray<{ asn: number; name: string; speed: number }>;
}> {
  // TODO: Search PeeringDB for IX by name or ID
  // TODO: Optionally fetch participant list
  return {
    ix: null,
    participants: input.include_participants ? [] : undefined,
  };
}
