import { describe, expect, it, vi } from "vitest";

import { createContractHttpExecutor } from "../../src/adapters/http/http-execution-v3.ts";
import type { InstalledHttpContract } from "../../src/contracts/external-contract-runtime.ts";
import { COMPOSED_CONTRACT_CONTRIBUTIONS } from "../../src/features/installed-contract-contributions.ts";

const installed = (() => {
  const candidate = COMPOSED_CONTRACT_CONTRIBUTIONS.httpByOperationId.get(
    "LIST_REFERENCE_RESOURCES",
  );
  if (!candidate) throw new Error("reference list contract is not installed");
  return candidate;
})();

const scope = Object.freeze({
  generation: 1,
  fingerprint: "scope-1",
  identities: Object.freeze({}) as never,
  signal: new AbortController().signal,
  isCurrent: () => true,
});

const createInstalled = (() => {
  const candidate = COMPOSED_CONTRACT_CONTRIBUTIONS.httpByOperationId.get(
    "CREATE_REFERENCE_RESOURCE",
  );
  if (!candidate) throw new Error("reference create contract is not installed");
  return candidate;
})();

function operation(
  overrides: Readonly<{
    deadlineMs?: number;
    responseBody?: "REQUIRED_JSON" | "OPTIONAL_JSON" | "NONE";
  }> = {},
): InstalledHttpContract<unknown, unknown, unknown> {
  return {
    ...installed,
    contract: {
      ...installed.contract,
      responseBody: overrides.responseBody ?? installed.contract.responseBody,
    },
    frontend: {
      ...installed.frontend,
      totalDeadlineMs: overrides.deadlineMs ?? installed.frontend.totalDeadlineMs,
    },
  };
}

async function flushMicrotasks(): Promise<void> {
  await Promise.resolve();
  await Promise.resolve();
  await Promise.resolve();
}

describe("descriptor-driven HTTP execution lifetime", () => {
  it.each([
    [{}, "limit=20"],
    [{ limit: "7" }, "limit=7"],
  ])("projects the canonical validated input %#", async (input, expectedQuery) => {
    const fetcher = vi.fn(async () => Response.json([]));
    const executor = createContractHttpExecutor({
      baseUrl: "https://api.example/",
      maxRetryAttempts: 0,
      attachCredentials: () => ({
        kind: "READY",
        headers: {},
        credentials: "omit",
      }),
      fetcher,
    });

    await expect(executor.execute(installed, input, { scope })).resolves.toMatchObject({
      kind: "SUCCESS",
    });
    expect(String((fetcher.mock.calls as unknown[][])[0]?.[0])).toContain(
      expectedQuery,
    );
  });

  it("contains throwing and malformed external request projections", async () => {
    const executor = createContractHttpExecutor({
      baseUrl: "https://api.example/",
      maxRetryAttempts: 0,
      attachCredentials: () => ({
        kind: "READY",
        headers: {},
        credentials: "omit",
      }),
      fetcher: vi.fn(),
    });
    const throwing = {
      ...installed,
      contract: {
        ...installed.contract,
        projectRequest: () => {
          throw new Error("external descriptor defect");
        },
      },
    };
    const malformed = {
      ...installed,
      contract: {
        ...installed.contract,
        projectRequest: () => ({ pathValues: {}, queryEntries: [["limit"]], body: null }),
      },
    } as unknown as typeof installed;

    await expect(executor.execute(throwing, { limit: 20 }, { scope })).resolves.toMatchObject({
      kind: "CONTRACT_VIOLATION",
      effect: "NOT_APPLICABLE",
    });
    await expect(executor.execute(malformed, { limit: 20 }, { scope })).resolves.toMatchObject({
      kind: "CONTRACT_VIOLATION",
      effect: "NOT_APPLICABLE",
    });
  });

  it("preserves MAYBE_APPLIED for a malformed command response after dispatch", async () => {
    const executor = createContractHttpExecutor({
      baseUrl: "https://api.example/",
      maxRetryAttempts: 0,
      attachCredentials: () => ({
        kind: "READY",
        headers: {},
        credentials: "omit",
      }),
      fetcher: vi.fn(async () => Response.json({ malformed: true }, { status: 201 })),
    });

    await expect(
      executor.execute(
        createInstalled,
        { name: "created" },
        {
          scope,
          intent: { intentId: "intent-1", startedBy: "USER", idempotencyKey: "key-1" },
        },
      ),
    ).resolves.toMatchObject({
      kind: "CONTRACT_VIOLATION",
      violation: { kind: "SUCCESS_SCHEMA_INVALID" },
      effect: "MAYBE_APPLIED",
    });
  });

  it("preserves MAYBE_APPLIED when a command response arrives after its scope fence", async () => {
    let current = true;
    const lifetime = new AbortController();
    const fencedScope = Object.freeze({
      ...scope,
      signal: lifetime.signal,
      isCurrent: () => current,
    });
    const executor = createContractHttpExecutor({
      baseUrl: "https://api.example/",
      maxRetryAttempts: 0,
      attachCredentials: () => ({
        kind: "READY",
        headers: {},
        credentials: "omit",
      }),
      fetcher: vi.fn(async () => {
        current = false;
        lifetime.abort();
        return Response.json(
          { id: "created", name: "Created" },
          { status: 201 },
        );
      }),
    });

    await expect(
      executor.execute(
        createInstalled,
        { name: "created" },
        {
          scope: fencedScope,
          intent: { intentId: "intent-2", startedBy: "USER", idempotencyKey: "key-2" },
        },
      ),
    ).resolves.toMatchObject({
      kind: "CONTRACT_VIOLATION",
      violation: { kind: "SCOPE_FENCED" },
      effect: "MAYBE_APPLIED",
    });
  });

  it("settles a credential hang at the total operation deadline", async () => {
    vi.useFakeTimers();
    let settled = false;
    const executor = createContractHttpExecutor({
      baseUrl: "https://api.example/",
      maxRetryAttempts: 0,
      attachCredentials: () => new Promise(() => {}),
    });

    const result = executor
      .execute(operation({ deadlineMs: 5 }), { limit: 20 }, { scope })
      .then((outcome) => {
        settled = true;
        return outcome;
      });
    await vi.advanceTimersByTimeAsync(5);
    await flushMicrotasks();

    expect(settled).toBe(true);
    await expect(result).resolves.toMatchObject({
      kind: "TRANSPORT_FAILURE",
      failure: { kind: "TIMEOUT" },
    });
    vi.useRealTimers();
  });

  it("cancels a non-cooperative retry sleep when the caller aborts", async () => {
    const caller = new AbortController();
    let sleepSignal: AbortSignal | undefined;
    let settled = false;
    const executor = createContractHttpExecutor({
      baseUrl: "https://api.example/",
      maxRetryAttempts: 2,
      attachCredentials: () => ({
        kind: "READY",
        headers: {},
        credentials: "omit",
      }),
      fetcher: vi.fn(async () =>
        Response.json(
          { type: "about:blank", title: "temporary", status: 503 },
          { status: 503 },
        ),
      ),
      sleep: (_ms, signal) => {
        sleepSignal = signal;
        return new Promise(() => {});
      },
      random: () => 0,
    });

    const result = executor
      .execute(installed, { limit: 20 }, { scope, signal: caller.signal })
      .then((outcome) => {
        settled = true;
        return outcome;
      });
    await vi.waitFor(() => expect(sleepSignal).toBeDefined());
    caller.abort();
    await flushMicrotasks();

    expect(sleepSignal?.aborted).toBe(true);
    expect(settled).toBe(true);
    await expect(result).resolves.toMatchObject({ kind: "CANCELLED" });
  });

  it("treats an unreadable forbidden-body probe as a transport failure", async () => {
    const body = new ReadableStream<Uint8Array>({
      pull(controller) {
        controller.error(new TypeError("stream failed"));
      },
    });
    const executor = createContractHttpExecutor({
      baseUrl: "https://api.example/",
      maxRetryAttempts: 0,
      attachCredentials: () => ({
        kind: "READY",
        headers: {},
        credentials: "omit",
      }),
      fetcher: vi.fn(async () => new Response(body, { status: 200 })),
    });

    await expect(
      executor.execute(
        operation({ responseBody: "NONE" }),
        { limit: 20 },
        { scope },
      ),
    ).resolves.toMatchObject({
      kind: "TRANSPORT_FAILURE",
      failure: { kind: "RESPONSE_STREAM_FAILURE" },
    });
  });
});