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

import { createApplication } from "../../src/application/create-application.ts";
import { createAnonymousSessionAdapter } from "../../src/adapters/auth/external-session-adapter.ts";
import type { StoragePort } from "../../src/application/ports/storage-port.ts";
import type { DiagnosticsPort } from "../../src/application/ports/diagnostics-port.ts";
import type { TelemetryPort } from "../../src/application/ports/telemetry-port.ts";
import { createRuntimeCapabilitiesStub } from "../helpers/runtime-capabilities-stub.ts";

type ReleaseFixture = {
  buildId: string;
  releaseId: string;
  configSchemaVersion: string;
  apiContractVersion: string;
  assetManifestHash: string;
  routeChunks: Record<string, string>;
};

function release(buildId: string, releaseId: string): ReleaseFixture {
  return {
    buildId,
    releaseId,
    configSchemaVersion: "1",
    apiContractVersion: "1",
    assetManifestHash: `${buildId}-assets`,
    routeChunks: { "route-home": `assets/${buildId}-home.js` },
  };
}

function memoryStorage(): StoragePort {
  let value: unknown;
  return {
    read: () => ({ ok: true, value }),
    write: (_name, next) => {
      value = next;
      return { ok: true };
    },
    remove: () => ({ ok: true }),
  };
}

function applicationWith(options: {
  storage?: StoragePort;
  refresh?: () => Promise<ReturnType<typeof release>>;
  reload?: () => void;
  diagnostics?: DiagnosticsPort;
  telemetry?: TelemetryPort;
}) {
  const current = release("build-a", "release-a");
  return createApplication({
    session: createAnonymousSessionAdapter(),
    preferences: options.storage ?? memoryStorage(),
    diagnostics: options.diagnostics ?? { record: () => {} },
    telemetry: options.telemetry ?? { emit: () => {} },
    runtimeCapabilities: createRuntimeCapabilitiesStub(),
    releaseInfo: {
      getCurrent: async () => current,
      refresh:
        options.refresh ??
        (async () => release("build-b", "release-b")),
    },
    navigation: { reload: options.reload ?? (() => {}) },
  });
}

describe("production chunk recovery application input", () => {
  it("reloads exactly once for one active build/release pair", async () => {
    const reload = vi.fn();
    const record = vi.fn<DiagnosticsPort["record"]>();
    const emit = vi.fn<TelemetryPort["emit"]>();
    const application = applicationWith({
      reload,
      diagnostics: { record },
      telemetry: { emit },
    });
    const input = {
      chunkId: "route-home",
      failureKind: "CHUNK_LOAD_FAILURE" as const,
    };

    await expect(application.recovery.recoverChunk(input)).resolves.toEqual({
      action: "reload-once",
      releasePair: "build-a/release-a->build-b/release-b",
    });
    expect(record).toHaveBeenCalledWith({
      level: "warn",
      eventId: "release.mismatch.detected",
      context: {
        build_id: "build-a",
        active_release_id: "release-b",
        mismatch_kind: "BUILD_MISMATCH",
      },
    });
    expect(emit).toHaveBeenCalledWith("release.mismatch.detected", {
      build_id: "build-a",
      active_release_id: "release-b",
      mismatch_kind: "BUILD_MISMATCH",
    });
    await expect(application.recovery.recoverChunk(input)).resolves.toEqual({
      action: "support",
      reason: "reload-already-attempted",
    });
    expect(reload).toHaveBeenCalledOnce();
  });

  it.each([
    [
      {
        refresh: async () => {
          throw new Error("offline");
        },
      },
      "manifest-unavailable",
    ],
    [
      {
        refresh: async () => ({
          ...release("build-b", "release-b"),
          routeChunks: {},
        }),
      },
      "active-chunk-unknown",
    ],
    [
      {
        storage: {
          read: () => ({
            ok: false as const,
            error: {
              kind: "STORAGE_UNAVAILABLE" as const,
              code: "STORAGE_UNAVAILABLE",
              retryable: false,
              operationId: "STORAGE",
              attemptCount: 1,
              userMessageKey: "error.storage_unavailable",
              action: "none" as const,
            },
          }),
          write: () => ({ ok: true as const }),
          remove: () => ({ ok: true as const }),
        },
      },
      "guard-read-failed",
    ],
  ])("fails closed for recovery dependency case %#", async (options, reason) => {
    const reload = vi.fn();
    const application = applicationWith({ ...options, reload });
    await expect(
      application.recovery.recoverChunk({
        chunkId: "route-home",
        failureKind: "CHUNK_LOAD_FAILURE",
      }),
    ).resolves.toEqual({ action: "support", reason });
    expect(reload).not.toHaveBeenCalled();
  });
});