/**
 * @module mcp-server/tools/atlas
 * MCP Tool: RIPE Atlas measurement management.
 *
 * Provides tools for creating, managing, and interpreting RIPE Atlas
 * network measurements. Wraps the Atlas source client with MCP-friendly
 * schemas and result formatting.
 */

import { z } from "zod";

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

/** Input schema for creating an Atlas measurement */
export const createMeasurementSchema = z.object({
  type: z
    .enum(["ping", "traceroute", "dns", "sslcert", "ntp", "http"])
    .describe("Measurement type"),
  target: z
    .string()
    .describe("Target IP address or hostname"),
  description: z
    .string()
    .optional()
    .describe("Human-readable measurement description"),
  af: z
    .union([z.literal(4), z.literal(6)])
    .optional()
    .default(4)
    .describe("Address family (4 or 6)"),
  probeCount: z
    .number()
    .optional()
    .default(10)
    .describe("Number of probes to use"),
  probeSelection: z
    .object({
      type: z
        .enum(["area", "country", "prefix", "asn", "probes"])
        .describe("Probe selection method"),
      value: z
        .string()
        .describe("Selection value (e.g., 'WW', 'DE', '1.1.1.0/24', '13335')"),
    })
    .optional()
    .describe("Probe selection criteria"),
});

/** Input schema for getting measurement results */
export const getMeasurementResultsSchema = z.object({
  measurementId: z
    .number()
    .describe("RIPE Atlas measurement ID"),
  format: z
    .enum(["raw", "summary", "detailed"])
    .optional()
    .default("summary")
    .describe("Result format (default: summary)"),
});

/** Input schema for searching probes */
export const searchProbesSchema = z.object({
  asn: z
    .number()
    .optional()
    .describe("Filter probes by ASN"),
  country: z
    .string()
    .optional()
    .describe("Filter probes by country code (e.g., 'DE')"),
  prefix: z
    .string()
    .optional()
    .describe("Filter probes by IP prefix"),
  isAnchor: z
    .boolean()
    .optional()
    .describe("Filter for anchors only"),
  limit: z
    .number()
    .optional()
    .default(25)
    .describe("Maximum number of results (default: 25)"),
});

// ── Result Types ─────────────────────────────────────────

/** Created measurement info */
export interface MeasurementCreated {
  readonly measurementId: number;
  readonly type: string;
  readonly target: string;
  readonly status: string;
  readonly probesRequested: number;
  readonly atlasUrl: string;
}

/** Measurement result summary */
export interface MeasurementResultSummary {
  readonly measurementId: number;
  readonly type: string;
  readonly target: string;
  readonly status: string;
  readonly probesUsed: number;
  readonly results: {
    readonly rttStats?: {
      readonly avgMs: number;
      readonly minMs: number;
      readonly maxMs: number;
      readonly medianMs: number;
      readonly stdDevMs: number;
    };
    readonly tracerouteStats?: {
      readonly avgHops: number;
      readonly minHops: number;
      readonly maxHops: number;
      readonly uniquePaths: number;
    };
    readonly dnsStats?: {
      readonly avgResponseMs: number;
      readonly successRate: number;
      readonly answers: number;
    };
  };
  readonly atlasUrl: string;
}

/** Probe search result */
export interface ProbeSearchResult {
  readonly probes: ReadonlyArray<{
    readonly id: number;
    readonly asnV4: number;
    readonly asnV6: number;
    readonly country: string;
    readonly city: string | null;
    readonly status: string;
    readonly isAnchor: boolean;
    readonly tags: ReadonlyArray<string>;
  }>;
  readonly totalCount: number;
  readonly returnedCount: number;
}

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

/**
 * Create a new RIPE Atlas measurement.
 *
 * Requires a RIPE Atlas API key (set via RIPE_ATLAS_API_KEY env var).
 * Creates a one-off measurement by default.
 *
 * @param input - Validated measurement parameters
 * @returns Created measurement info with Atlas URL
 *
 * @example
 * ```
 * > Run a traceroute from 20 probes in Germany to 1.1.1.1
 *
 * Creates: Traceroute measurement with probe selection type "country", value "DE"
 * Returns: Measurement ID and Atlas URL for monitoring
 * ```
 */
export async function handleCreateMeasurement(
  input: z.infer<typeof createMeasurementSchema>
): Promise<MeasurementCreated> {
  // TODO: Create measurement via RIPE Atlas client
  // TODO: Map probe selection criteria
  // TODO: Return measurement ID and tracking URL

  const _input = input;

  return {
    measurementId: 0, // TODO: Real measurement ID
    type: input.type,
    target: input.target,
    status: "Specified",
    probesRequested: input.probeCount ?? 10,
    atlasUrl: `https://atlas.ripe.net/measurements/0/`, // TODO: Real URL
  };
}

/**
 * Get results for a RIPE Atlas measurement.
 *
 * Fetches and summarizes measurement results in the requested format.
 *
 * @param input - Validated results query
 * @returns Measurement result summary
 */
export async function handleGetMeasurementResults(
  input: z.infer<typeof getMeasurementResultsSchema>
): Promise<MeasurementResultSummary> {
  // TODO: Fetch measurement metadata from Atlas client
  // TODO: Fetch results and aggregate based on measurement type
  // TODO: Calculate summary statistics

  return {
    measurementId: input.measurementId,
    type: "",       // TODO: From measurement metadata
    target: "",     // TODO: From measurement metadata
    status: "",     // TODO: From measurement metadata
    probesUsed: 0,
    results: {},
    atlasUrl: `https://atlas.ripe.net/measurements/${input.measurementId}/`,
  };
}

/**
 * Search for RIPE Atlas probes by various criteria.
 *
 * @param input - Validated search parameters
 * @returns Matching probes with metadata
 *
 * @example
 * ```
 * > Find Atlas anchors in Germany
 *
 * Returns: List of RIPE Atlas anchors with ASN, location, and status.
 * ```
 */
export async function handleSearchProbes(
  input: z.infer<typeof searchProbesSchema>
): Promise<ProbeSearchResult> {
  // TODO: Query RIPE Atlas probes API with filters
  // TODO: Map results to simplified probe format

  const _input = input;

  return {
    probes: [],
    totalCount: 0,
    returnedCount: 0,
  };
}
