import { describe, expect, it, vi } from "vitest";
import {
  getShellPathFromLoginShell,
  loadShellEnvFallback,
  resetShellPathCacheForTests,
  resolveShellEnvFallbackTimeoutMs,
  shouldEnableShellEnvFallback,
} from "./shell-env.js";

describe("shell env fallback", () => {
  it("is disabled by default", () => {
    expect(shouldEnableShellEnvFallback({} as NodeJS.ProcessEnv)).toBe(false);
    expect(shouldEnableShellEnvFallback({ OPENCLAW_LOAD_SHELL_ENV: "0" })).toBe(false);
    expect(shouldEnableShellEnvFallback({ OPENCLAW_LOAD_SHELL_ENV: "1" })).toBe(true);
  });

  it("resolves timeout from env with default fallback", () => {
    expect(resolveShellEnvFallbackTimeoutMs({} as NodeJS.ProcessEnv)).toBe(15000);
    expect(resolveShellEnvFallbackTimeoutMs({ OPENCLAW_SHELL_ENV_TIMEOUT_MS: "42" })).toBe(42);
    expect(
      resolveShellEnvFallbackTimeoutMs({
        OPENCLAW_SHELL_ENV_TIMEOUT_MS: "nope",
      }),
    ).toBe(15000);
  });

  it("skips when already has an expected key", () => {
    const env: NodeJS.ProcessEnv = { OPENAI_API_KEY: "set" };
    const exec = vi.fn(() => Buffer.from(""));

    const res = loadShellEnvFallback({
      enabled: true,
      env,
      expectedKeys: ["OPENAI_API_KEY", "DISCORD_BOT_TOKEN"],
      exec: exec as unknown as Parameters<typeof loadShellEnvFallback>[0]["exec"],
    });

    expect(res.ok).toBe(true);
    expect(res.applied).toEqual([]);
    expect(res.ok && res.skippedReason).toBe("already-has-keys");
    expect(exec).not.toHaveBeenCalled();
  });

  it("imports expected keys without overriding existing env", () => {
    const env: NodeJS.ProcessEnv = {};
    const exec = vi.fn(() => Buffer.from("OPENAI_API_KEY=from-shell\0DISCORD_BOT_TOKEN=discord\0"));

    const res1 = loadShellEnvFallback({
      enabled: true,
      env,
      expectedKeys: ["OPENAI_API_KEY", "DISCORD_BOT_TOKEN"],
      exec: exec as unknown as Parameters<typeof loadShellEnvFallback>[0]["exec"],
    });

    expect(res1.ok).toBe(true);
    expect(env.OPENAI_API_KEY).toBe("from-shell");
    expect(env.DISCORD_BOT_TOKEN).toBe("discord");
    expect(exec).toHaveBeenCalledTimes(1);

    env.OPENAI_API_KEY = "from-parent";
    const exec2 = vi.fn(() =>
      Buffer.from("OPENAI_API_KEY=from-shell\0DISCORD_BOT_TOKEN=discord2\0"),
    );
    const res2 = loadShellEnvFallback({
      enabled: true,
      env,
      expectedKeys: ["OPENAI_API_KEY", "DISCORD_BOT_TOKEN"],
      exec: exec2 as unknown as Parameters<typeof loadShellEnvFallback>[0]["exec"],
    });

    expect(res2.ok).toBe(true);
    expect(env.OPENAI_API_KEY).toBe("from-parent");
    expect(env.DISCORD_BOT_TOKEN).toBe("discord");
    expect(exec2).not.toHaveBeenCalled();
  });

  it("resolves PATH via login shell and caches it", () => {
    resetShellPathCacheForTests();
    const exec = vi.fn(() => Buffer.from("PATH=/usr/local/bin:/usr/bin\0HOME=/tmp\0"));

    const first = getShellPathFromLoginShell({
      env: {} as NodeJS.ProcessEnv,
      exec: exec as unknown as Parameters<typeof getShellPathFromLoginShell>[0]["exec"],
    });
    const second = getShellPathFromLoginShell({
      env: {} as NodeJS.ProcessEnv,
      exec: exec as unknown as Parameters<typeof getShellPathFromLoginShell>[0]["exec"],
    });

    if (process.platform === "win32") {
      expect(first).toBeNull();
      expect(second).toBeNull();
      expect(exec).not.toHaveBeenCalled();
      return;
    }

    expect(first).toBe("/usr/local/bin:/usr/bin");
    expect(second).toBe("/usr/local/bin:/usr/bin");
    expect(exec).toHaveBeenCalledOnce();
  });

  it("returns null on shell env read failure and caches null", () => {
    resetShellPathCacheForTests();
    const exec = vi.fn(() => {
      throw new Error("exec failed");
    });

    const first = getShellPathFromLoginShell({
      env: {} as NodeJS.ProcessEnv,
      exec: exec as unknown as Parameters<typeof getShellPathFromLoginShell>[0]["exec"],
    });
    const second = getShellPathFromLoginShell({
      env: {} as NodeJS.ProcessEnv,
      exec: exec as unknown as Parameters<typeof getShellPathFromLoginShell>[0]["exec"],
    });

    expect(first).toBeNull();
    expect(second).toBeNull();
    if (process.platform === "win32") {
      expect(exec).not.toHaveBeenCalled();
      return;
    }
    expect(exec).toHaveBeenCalledOnce();
  });
});