import { describe, expect, it, vi } from "vitest";
import { createLanceDbRuntimeLoader, type LanceDbRuntimeLogger } from "./lancedb-runtime.js";

const TEST_RUNTIME_MANIFEST = {
  name: "openclaw-memory-lancedb-runtime",
  private: true as const,
  type: "module" as const,
  dependencies: {
    "@lancedb/lancedb": "^0.27.1",
  },
};

type LanceDbModule = typeof import("@lancedb/lancedb");
type RuntimeManifest = {
  name: string;
  private: true;
  type: "module";
  dependencies: Record<string, string>;
};

function createMockModule(): LanceDbModule {
  return {
    connect: vi.fn(),
  } as unknown as LanceDbModule;
}

function createLoader(
  overrides: {
    env?: NodeJS.ProcessEnv;
    importBundled?: () => Promise<LanceDbModule>;
    importResolved?: (resolvedPath: string) => Promise<LanceDbModule>;
    resolveRuntimeEntry?: (params: {
      runtimeDir: string;
      manifest: RuntimeManifest;
    }) => string | null;
    installRuntime?: (params: {
      runtimeDir: string;
      manifest: RuntimeManifest;
      env: NodeJS.ProcessEnv;
      logger?: LanceDbRuntimeLogger;
    }) => Promise<string>;
  } = {},
) {
  return createLanceDbRuntimeLoader({
    env: overrides.env ?? ({} as NodeJS.ProcessEnv),
    resolveStateDir: () => "/tmp/openclaw-state",
    runtimeManifest: TEST_RUNTIME_MANIFEST,
    importBundled:
      overrides.importBundled ??
      (async () => {
        throw new Error("Cannot find package '@lancedb/lancedb'");
      }),
    importResolved: overrides.importResolved ?? (async () => createMockModule()),
    resolveRuntimeEntry: overrides.resolveRuntimeEntry ?? (() => null),
    installRuntime:
      overrides.installRuntime ??
      (async ({ runtimeDir }: { runtimeDir: string }) =>
        `${runtimeDir}/node_modules/@lancedb/lancedb/index.js`),
  });
}

describe("lancedb runtime loader", () => {
  it("uses the bundled module when it is already available", async () => {
    const bundledModule = createMockModule();
    const importBundled = vi.fn(async () => bundledModule);
    const importResolved = vi.fn(async () => createMockModule());
    const resolveRuntimeEntry = vi.fn(() => null);
    const installRuntime = vi.fn(async () => "/tmp/openclaw-state/plugin-runtimes/lancedb.js");
    const loader = createLoader({
      importBundled,
      importResolved,
      resolveRuntimeEntry,
      installRuntime,
    });

    await expect(loader.load()).resolves.toBe(bundledModule);

    expect(resolveRuntimeEntry).not.toHaveBeenCalled();
    expect(installRuntime).not.toHaveBeenCalled();
    expect(importResolved).not.toHaveBeenCalled();
  });

  it("reuses an existing user runtime install before attempting a reinstall", async () => {
    const runtimeModule = createMockModule();
    const importResolved = vi.fn(async () => runtimeModule);
    const resolveRuntimeEntry = vi.fn(
      () => "/tmp/openclaw-state/plugin-runtimes/memory-lancedb/runtime-entry.js",
    );
    const installRuntime = vi.fn(
      async () => "/tmp/openclaw-state/plugin-runtimes/memory-lancedb/runtime-entry.js",
    );
    const loader = createLoader({
      importResolved,
      resolveRuntimeEntry,
      installRuntime,
    });

    await expect(loader.load()).resolves.toBe(runtimeModule);

    expect(resolveRuntimeEntry).toHaveBeenCalledWith(
      expect.objectContaining({
        runtimeDir: "/tmp/openclaw-state/plugin-runtimes/memory-lancedb/lancedb",
      }),
    );
    expect(installRuntime).not.toHaveBeenCalled();
  });

  it("installs LanceDB into user state when the bundled runtime is unavailable", async () => {
    const runtimeModule = createMockModule();
    const logger: LanceDbRuntimeLogger = {
      warn: vi.fn(),
      info: vi.fn(),
    };
    const importResolved = vi.fn(async () => runtimeModule);
    const resolveRuntimeEntry = vi.fn(() => null);
    const installRuntime = vi.fn(
      async ({ runtimeDir }: { runtimeDir: string }) =>
        `${runtimeDir}/node_modules/@lancedb/lancedb/index.js`,
    );
    const loader = createLoader({
      importResolved,
      resolveRuntimeEntry,
      installRuntime,
    });

    await expect(loader.load(logger)).resolves.toBe(runtimeModule);

    expect(installRuntime).toHaveBeenCalledWith(
      expect.objectContaining({
        runtimeDir: "/tmp/openclaw-state/plugin-runtimes/memory-lancedb/lancedb",
        manifest: TEST_RUNTIME_MANIFEST,
      }),
    );
    expect(logger.warn).toHaveBeenCalledWith(
      expect.stringContaining(
        "installing runtime deps under /tmp/openclaw-state/plugin-runtimes/memory-lancedb/lancedb",
      ),
    );
  });

  it("fails fast in nix mode instead of attempting auto-install", async () => {
    const installRuntime = vi.fn(
      async ({ runtimeDir }: { runtimeDir: string }) =>
        `${runtimeDir}/node_modules/@lancedb/lancedb/index.js`,
    );
    const loader = createLoader({
      env: { OPENCLAW_NIX_MODE: "1" } as NodeJS.ProcessEnv,
      installRuntime,
    });

    await expect(loader.load()).rejects.toThrow(
      "memory-lancedb: failed to load LanceDB and Nix mode disables auto-install.",
    );
    expect(installRuntime).not.toHaveBeenCalled();
  });

  it("clears the cached failure so later calls can retry the install", async () => {
    const runtimeModule = createMockModule();
    const installRuntime = vi
      .fn()
      .mockRejectedValueOnce(new Error("network down"))
      .mockResolvedValueOnce(
        "/tmp/openclaw-state/plugin-runtimes/memory-lancedb/lancedb/node_modules/@lancedb/lancedb/index.js",
      );
    const importResolved = vi.fn(async () => runtimeModule);
    const loader = createLoader({
      installRuntime,
      importResolved,
    });

    await expect(loader.load()).rejects.toThrow("network down");
    await expect(loader.load()).resolves.toBe(runtimeModule);

    expect(installRuntime).toHaveBeenCalledTimes(2);
  });
});