import { HttpResponse, http } from "msw";
import { setupServer } from "msw/node";
import { afterAll, afterEach, beforeAll, describe, expect, it, vi } from "vitest";

import { createHttpClient } from "../../src/adapters/http/client.ts";
import { defineRestOperation } from "../../src/contracts/api-operations.ts";
import { createRestProviderProfile } from "../../src/contracts/rest-profiles.ts";
import { TEST_HTTP_CONTRACT } from "../helpers/http-contract-fixture.ts";

/**
 * LEG-01 / LEG-02. The V2 client is not the default path any more, but a
 * rollback re-activates it, so its credential and recovery authority must match
 * V3 rather than diverge quietly.
 */

const BEARER_LIST = defineRestOperation({
  method: "GET",
  path: "/api/entities",
  operationId: "LIST_ENTITIES",
  auth: "external-session",
  timeoutMs: null,
  idempotency: "safe",
  retry: "runtime",
  requestSource: "search",
  requestSchema: "EntityListQuery",
  responseSchema: "EntityListPayload",
  owner: "test-fixture",
  contractVersion: 2,
  protocol: "REST",
  semantics: "QUERY",
  replayPolicy: "SAFE",
  idempotencyKeyPolicy: "NONE",
  mapperId: "EntityListMapper",
  successStatuses: [200],
  responseMediaTypes: ["application/json"],
  maxResponseBytes: 32_768,
  providerId: "PRIMARY_API",
  authProfileId: "REFERENCE_EXTERNAL_BEARER",
  csrfProfileId: "NO_CSRF_BEARER",
  pathSchema: "NoRequest",
  pathParameterNames: [],
  maxEncodedSearchBytes: 1_024,
});

let observedAuthorization: string | null = null;
let requestCount = 0;
let nextStatus = 200;

const server = setupServer(
  http.get("https://api.test/api/entities", ({ request }) => {
    requestCount += 1;
    observedAuthorization = request.headers.get("authorization");
    if (nextStatus === 401) {
      return HttpResponse.json(
        {
          success: false,
          error: { code: "UNAUTHENTICATED" },
          meta: { requestId: "request-1", traceId: "trace-1" },
        },
        { status: 401 },
      );
    }
    return HttpResponse.json({
      success: true,
      data: [{ id: "resource-1", name: "Example" }],
      meta: { requestId: "request-2", traceId: "trace-1" },
    });
  }),
);

beforeAll(() => server.listen({ onUnhandledRequest: "error" }));
afterEach(() => {
  observedAuthorization = null;
  requestCount = 0;
  nextStatus = 200;
  server.resetHandlers();
});
afterAll(() => server.close());

const clock = { now: () => 0, sleep: async () => {} };

type HttpDependencies = Parameters<typeof createHttpClient>[0];

function bearerClient(options: Partial<HttpDependencies>) {
  return createHttpClient({
    ...TEST_HTTP_CONTRACT,
    getOperation: (operationId: string) => {
      if (operationId !== "LIST_ENTITIES") {
        throw new Error(`Unknown test operation: ${operationId}`);
      }
      return BEARER_LIST;
    },
    baseUrl: "https://api.test",
    providerProfile: createRestProviderProfile("PRIMARY_API", "https://api.test", [
      "omit",
    ]),
    // The V2 fixture declares `NoRequest` for its path codec, which the shared
    // schema registry does not carry.
    validatePath: () => ({ success: true as const, data: {} }),
    clock,
    ...options,
  } as HttpDependencies);
}

function sessionStub(
  overrides: Partial<{
    getState: () => "authenticated" | "unauthenticated" | "recovery-pending" | "integration-failed";
    credentialPatch: (...args: never[]) => Promise<{ headers: Record<string, string> }>;
    recover: (...args: never[]) => Promise<"restored" | "no-session">;
    onUnauthenticated: () => void;
  }> = {},
) {
  return {
    getState: () => "authenticated" as const,
    subscribe: () => () => {},
    beginSignIn: async () => {},
    signOut: async () => {},
    credentialPatch: async () => ({ headers: { authorization: "Bearer t" } }),
    recover: async () => "restored" as const,
    onUnauthenticated: () => {},
    ...overrides,
  };
}

describe("LEG-02 the bearer profile's required header is enforced", () => {
  it("refuses to dispatch when a READY patch omits authorization", async () => {
    const client = bearerClient({
      authSession: sessionStub({
        credentialPatch: async () => ({ headers: {} }),
      }) as never,
    });

    await expect(client.execute("LIST_ENTITIES")).resolves.toMatchObject({
      ok: false,
      error: { kind: "AUTH_INTEGRATION_FAILURE" },
    });
    expect(requestCount).toBe(0);
  });

  it("rejects a malformed or duplicated authorization value", async () => {
    const hostilePatches: readonly Record<string, string>[] = [
      { authorization: "" },
      { authorization: "Bearer bad\nvalue" },
      { Authorization: "Bearer a", authorization: "Bearer b" },
    ];
    for (const headers of hostilePatches) {
      const client = bearerClient({
        authSession: sessionStub({
          credentialPatch: async () => ({ headers }),
        }) as never,
      });
      await expect(client.execute("LIST_ENTITIES")).resolves.toMatchObject({
        ok: false,
        error: { kind: "AUTH_INTEGRATION_FAILURE" },
      });
    }
    expect(requestCount).toBe(0);
  });

  it("dispatches with the admitted authorization header", async () => {
    const client = bearerClient({
      authSession: sessionStub() as never,
    });

    await expect(client.execute("LIST_ENTITIES")).resolves.toMatchObject({
      ok: true,
    });
    expect(observedAuthorization).toBe("Bearer t");
  });
});

describe("LEG-01 recovery notification follows the adopted result", () => {
  it("does not sign the user out when recovery answers after the deadline", async () => {
    nextStatus = 401;
    const onUnauthenticated = vi.fn();
    let elapsed = 0;
    const client = bearerClient({
      clock: {
        now: () => elapsed,
        sleep: async () => {},
      },
      timeoutMs: 20,
      authSession: sessionStub({
        onUnauthenticated,
        recover: async () => {
          // The request's own deadline expires while recovery is still out.
          elapsed = 10_000;
          await new Promise((resolve) => setTimeout(resolve, 30));
          return "no-session" as const;
        },
      }) as never,
    });

    const outcome = await client.execute("LIST_ENTITIES");
    expect(outcome.ok).toBe(false);
    await new Promise((resolve) => setTimeout(resolve, 60));
    expect(onUnauthenticated).toHaveBeenCalledTimes(0);
  });

  it("signs the user out exactly once for an adopted no-session result", async () => {
    nextStatus = 401;
    const onUnauthenticated = vi.fn();
    const client = bearerClient({
      authSession: sessionStub({
        onUnauthenticated,
        recover: async () => "no-session" as const,
      }) as never,
    });

    await expect(client.execute("LIST_ENTITIES")).resolves.toMatchObject({
      ok: false,
      error: { kind: "AUTH_REQUIRED" },
    });
    expect(onUnauthenticated).toHaveBeenCalledTimes(1);
  });

  it("stays bounded when recovery never settles", async () => {
    nextStatus = 401;
    const onUnauthenticated = vi.fn();
    let elapsed = 0;
    const client = bearerClient({
      clock: {
        now: () => {
          elapsed += 5;
          return elapsed;
        },
        sleep: async () => {},
      },
      timeoutMs: 20,
      authSession: sessionStub({
        onUnauthenticated,
        recover: () => new Promise<"restored">(() => {}),
      }) as never,
    });

    const outcome = await client.execute("LIST_ENTITIES");
    expect(outcome.ok).toBe(false);
    expect(onUnauthenticated).toHaveBeenCalledTimes(0);
  });
});