opencode

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217// A scripted stand-in for `opencode serve` behind `api.net.fetch`, for the
// agent tests: the event stream, the session lookups and the pending
// request lists, with every other call recorded.
//
// Plus the scoped adapter runtime for the provider's scripted tests: a
// local Promise facade keeps the scenarios and assertions close to the
// JavaScript originals.
import { afterEach } from "node:test";
import * as Effect from "effect/Effect";
import * as ManagedRuntime from "effect/ManagedRuntime";
import * as Scope from "effect/Scope";
import * as Exit from "effect/Exit";
import { liveLayer } from "convergence/effect";
import type { PluginServices } from "convergence/effect";
import type { Api, RequestInit } from "convergence";
import { FakeStream, fakeApi, fakeResponse } from "../sdk/testing.ts";
import type { FakeOptions } from "../sdk/testing.ts";
import { OpenCodeAgent } from "./agent.ts";
import { defaultInstance } from "./instances.ts";
import type { Instance } from "./instances.ts";

export const BASE = "http://127.0.0.1:4096";

export interface FakeCall {
  method: string;
  path: string;
  query: Record<string, string>;
  body: unknown;
  headers: Record<string, string>;
}

export type FakeRoutes = (
  call: FakeCall,
) => { status?: number; body?: unknown; headers?: Record<string, string> } | undefined;

/// `events`: the SSE payload each `GET /event` connection sends; entry `n`
/// serves connection `n`, and the last one is held open. `routes(call)`
/// answers any other call (`{ status, body }`), or `undefined` for the
/// defaults.
export class FakeOpenCode {
  events: string[];
  routes: FakeRoutes;
  status: unknown;
  connections = 0;
  streams: FakeStream[] = [];
  calls: FakeCall[] = [];
  created = 0;

  /// `status` answers `GET /session/status` (the sessions at work); none
  /// answers 404, as a server that cannot say.
  constructor({
    events = [""],
    routes = () => undefined,
    status = null,
  }: { events?: string[]; routes?: FakeRoutes; status?: unknown } = {}) {
    this.events = events;
    this.routes = routes;
    this.status = status;
  }

  handle(url: string, init: RequestInit = {}) {
    const parsed = new URL(url);
    const method = String(init.method ?? "GET").toUpperCase();
    const query = Object.fromEntries(parsed.searchParams.entries());
    const raw = init.body;
    const call: FakeCall = {
      method,
      path: parsed.pathname,
      query,
      body: raw ? JSON.parse(String(raw)) : null,
      headers: headerRecord(init),
    };
    if (parsed.pathname === "/event") {
      const index = this.connections++;
      const stream = new FakeStream();
      this.streams.push(stream);
      const payload = this.events[index];
      if (payload) stream.push(payload);
      // The last entry is the steady state: held open.
      if (index + 1 < this.events.length) stream.end();
      return fakeResponse({ status: 200, body: stream, headers: { "content-type": "text/event-stream" } });
    }
    this.calls.push(call);
    const answer = this.routes(call);
    if (answer !== undefined) return fakeResponse(answer);
    const path = parsed.pathname;
    if (path === "/session/status")
      return this.status ? fakeResponse({ body: this.status }) : fakeResponse({ status: 404, body: "" });
    if (path === "/permission" || path === "/question" || path.endsWith("/children")) return fakeResponse({ body: [] });
    if (method === "GET" && /^\/session\/[^/]+$/.test(path)) return fakeResponse({ body: { id: path.split("/")[2] } });
    if (method === "POST" && path === "/mcp") return fakeResponse({ body: { convergence: { status: "connected" } } });
    if (method === "POST" && path === "/session") {
      this.created += 1;
      const body = (call.body ?? {}) as { permission?: unknown };
      return fakeResponse({ body: { id: `ses_new${this.created}`, permission: body.permission ?? [] } });
    }
    if (path.startsWith("/session/")) return fakeResponse({ body: { id: "ses_1" } });
    return fakeResponse({ status: 204, body: "" });
  }

  /// Pushes more events on the open stream.
  push(...events: unknown[]) {
    const stream = this.streams.at(-1);
    if (!stream) throw new Error("no event stream is open");
    for (const event of events) stream.push(sse(event));
  }

  /// Waits until a call `test` accepts has arrived.
  async waitFor(test: (call: FakeCall) => unknown, timeout = 3000): Promise<FakeCall> {
    const deadline = Date.now() + timeout;
    for (;;) {
      const found = this.calls.find(test);
      if (found) return found;
      if (Date.now() > deadline)
        throw new Error(`the call never came: ${JSON.stringify(this.calls.map((c) => `${c.method} ${c.path}`))}`);
      await new Promise((resolve) => setTimeout(resolve, 5));
    }
  }
}

/// The request headers as a record, for the calls the tests inspect.
function headerRecord(init: RequestInit): Record<string, string> {
  const headers = init.headers;
  if (headers && typeof headers === "object" && !Array.isArray(headers) && !(headers instanceof Headers)) {
    const out: Record<string, string> = {};
    for (const [key, value] of Object.entries(headers)) out[key] = String(value);
    return out;
  }
  return {};
}

/// One SSE event carrying `value` as JSON.
export function sse(value: unknown): string {
  return `data: ${JSON.stringify(value)}\n\n`;
}

/// A fake `api` whose network is `server`.
export function apiFor(server: FakeOpenCode, options: FakeOptions = {}) {
  return fakeApi({ ...options, onFetch: (url, init) => server.handle(url, init) });
}

/// Collects the agent's events until `stop(event)` is true or `timeout`
/// passes.
export async function collect<E>(emitted: E[], stop: (event: E) => unknown, timeout = 3000): Promise<E[]> {
  const deadline = Date.now() + timeout;
  for (;;) {
    const found = emitted.findIndex(stop);
    if (found >= 0) return emitted.slice(0, found + 1);
    if (Date.now() > deadline) return [...emitted];
    await new Promise((resolve) => setTimeout(resolve, 5));
  }
}

type PromiseMethods<A> = {
  [K in keyof A]: A[K] extends (...args: infer P) => Effect.Effect<infer R, infer _E, infer _S>
    ? (...args: P) => Promise<R>
    : A[K];
};
const cleanups = new Set<() => Promise<void>>();
afterEach(async () => {
  for (const close of cleanups) await close();
  cleanups.clear();
});

/// An agent on the plugin scope with Effect methods as Promises, for the
/// scripted scenarios. `instance` defaults to a server the user runs (so
/// nothing is started).
export function testAgent(
  api: Api,
  env: Record<string, string> = {},
  instance: Instance = { ...defaultInstance(), serverUrl: BASE },
) {
  const scope = Scope.makeUnsafe();
  const builtins = liveLayer(
    api,
    (effect) => runtime.runPromise(effect as Effect.Effect<never, unknown, PluginServices>),
    () => {},
  );
  const runtime = ManagedRuntime.make(builtins);
  const agent = new OpenCodeAgent({ scope, instance, env });
  cleanups.add(async () => {
    await runtime.runPromise(Scope.close(scope, Exit.void));
    await runtime.dispose();
  });
  // This locally built proxy changes only Effect methods into Promise methods.
  // Their environment is the same PluginServices provided by this runtime.
  return new Proxy(agent, {
    get(target, key, receiver) {
      const value: unknown = Reflect.get(target, key, receiver);
      if (typeof value !== "function") return value;
      return (...args: unknown[]) => {
        const result: unknown = Reflect.apply(value, target, args);
        return Effect.isEffect(result)
          ? runtime.runPromise(result as Effect.Effect<unknown, unknown, PluginServices>)
          : result;
      };
    },
  }) as unknown as PromiseMethods<OpenCodeAgent>;
}

/// Runs one Effect with the plugin services of `api`, for the client, CLI
/// and maintenance tests.
export function testRuntime(api: Api) {
  const builtins = liveLayer(
    api,
    (effect) => runtime.runPromise(effect as Effect.Effect<never, unknown, PluginServices>),
    () => {},
  );
  const runtime = ManagedRuntime.make(builtins);
  cleanups.add(async () => {
    await runtime.dispose();
  });
  return {
    run: <A, E>(effect: Effect.Effect<A, E, PluginServices>): Promise<A> => runtime.runPromise(effect),
    runtime,
  };
}