/**
 * Aspirational Example (xfail target): Offline A2A multi-agent cassette replay
 *
 * GAP STATEMENT
 *   No offline cassette infrastructure for A2A multi-agent runs;
 *   @reactive-agents/replay supports single-agent record/replay but inter-agent
 *   message replay is not modeled. `packages/a2a/src/` has no record/replay/cassette
 *   surface (grep: 0 matches for "cassette|record|replay" in packages/a2a/src/).
 *
 *   Today `apps/examples/src/multi-agent/08-a2a-protocol.ts` exists but cannot
 *   be marked `requiresKey: false` because the multi-agent path has no
 *   cassette/test-provider story for cross-agent messages.
 *
 * SPEC (executable witness — must pass once the feature ships):
 *   1. Two agents are built with `.withProvider("test")` (offline-safe).
 *   2. They communicate over A2A using a cassette/recorded inter-agent transcript.
 *   3. Replay produces the same final output as the recording — no live keys.
 *
 *   A reasonable shape (subject to design):
 *     const cassette = await loadA2ACassette("./fixtures/a2a-handshake.jsonl");
 *     const a = await ReactiveAgents.create().withProvider("test").withA2A({ cassette }).build();
 *     const b = await ReactiveAgents.create().withProvider("test").withA2A({ cassette }).build();
 *
 * Usage:
 *   bun run apps/examples/src/multi-agent/a2a-cassette-replay.ts
 */

import { ReactiveAgents } from "reactive-agents";

export interface ExampleResult {
  passed: boolean;
  output: string;
  steps: number;
  tokens: number;
  durationMs: number;
}

export async function run(_opts?: { provider?: string; model?: string }): Promise<ExampleResult> {
  const start = Date.now();
  console.log("=== Aspirational: A2A offline cassette replay ===\n");

  const gaps: string[] = [];

  // ── Surface gap 1: @reactive-agents/replay has no A2A cassette surface ──────
  try {
    const replayMod = (await import("@reactive-agents/replay")) as Record<string, unknown>;
    const hasA2ASurface =
      "loadA2ACassette" in replayMod ||
      "replayA2A" in replayMod ||
      "A2ACassette" in replayMod ||
      "makeA2AReplayTransport" in replayMod;
    if (!hasA2ASurface) {
      gaps.push(
        "@reactive-agents/replay exports no A2A cassette surface " +
          "(no loadA2ACassette/replayA2A/A2ACassette/makeA2AReplayTransport).",
      );
    }
  } catch (err) {
    gaps.push(`could not import @reactive-agents/replay: ${(err as Error).message}`);
  }

  // ── Surface gap 2: @reactive-agents/a2a has no record/replay/cassette surface ─
  try {
    const a2aMod = (await import("@reactive-agents/a2a")) as Record<string, unknown>;
    const hasA2ARecord =
      "recordA2A" in a2aMod ||
      "A2ACassette" in a2aMod ||
      "makeRecordingTransport" in a2aMod ||
      "makeReplayTransport" in a2aMod;
    if (!hasA2ARecord) {
      gaps.push(
        "@reactive-agents/a2a exports no record/replay/cassette surface " +
          "(no recordA2A/A2ACassette/makeRecordingTransport/makeReplayTransport).",
      );
    }
  } catch (err) {
    gaps.push(`could not import @reactive-agents/a2a: ${(err as Error).message}`);
  }

  // ── Surface gap 3: builder has no .withA2A({ cassette }) hook ───────────────
  const probe = ReactiveAgents.create() as any;
  if (typeof probe.withA2A !== "function") {
    gaps.push(".withA2A({ cassette }) builder hook missing.");
  }

  // Build two test-provider agents anyway, to exercise whatever A2A primitives
  // exist today and prove the example shape is correct.
  let buildOk = false;
  try {
    const a = await (ReactiveAgents.create() as any)
      .withName("xfail-a2a-a")
      .withProvider("test")
      .withTestScenario([{ text: "hello from A" }])
      .withMaxIterations(2)
      .build();
    const b = await (ReactiveAgents.create() as any)
      .withName("xfail-a2a-b")
      .withProvider("test")
      .withTestScenario([{ text: "hello from B" }])
      .withMaxIterations(2)
      .build();
    void a; void b;
    buildOk = true;
  } catch (err) {
    gaps.push(`failed to build paired test-provider agents: ${(err as Error).message}`);
  }

  if (gaps.length > 0) {
    return {
      passed: false,
      output:
        "No offline cassette infrastructure for A2A multi-agent runs; " +
        "@reactive-agents/replay supports single-agent record/replay but " +
        "inter-agent message replay is not modeled. Gaps: " + gaps.join(" | ") +
        ` (paired test-provider build ok=${buildOk}).`,
      steps: 0,
      tokens: 0,
      durationMs: Date.now() - start,
    };
  }

  // If we reach here, the cassette infra exists. We would load a recorded
  // transcript and exercise it. Until then, this branch is unreachable.
  return {
    passed: false,
    output:
      "Cassette surfaces detected but no executable witness wired yet — " +
      "update this example to load a real cassette and assert equality.",
    steps: 0,
    tokens: 0,
    durationMs: Date.now() - start,
  };
}

if (import.meta.main) {
  run().then((r) => {
    console.log(JSON.stringify(r, null, 2));
    process.exit(r.passed ? 0 : 1);
  });
}
