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

import {
  extractPathFromShellOutput,
  readEnvironmentFromLoginShell,
  readPathFromLoginShell,
} from "./shell";

describe("extractPathFromShellOutput", () => {
  it("extracts the path between capture markers", () => {
    expect(
      extractPathFromShellOutput(
        "__T3CODE_PATH_START__\n/opt/homebrew/bin:/usr/bin\n__T3CODE_PATH_END__\n",
      ),
    ).toBe("/opt/homebrew/bin:/usr/bin");
  });

  it("ignores shell startup noise around the capture markers", () => {
    expect(
      extractPathFromShellOutput(
        "Welcome to fish\n__T3CODE_PATH_START__\n/opt/homebrew/bin:/usr/bin\n__T3CODE_PATH_END__\nBye\n",
      ),
    ).toBe("/opt/homebrew/bin:/usr/bin");
  });

  it("returns null when the markers are missing", () => {
    expect(extractPathFromShellOutput("/opt/homebrew/bin /usr/bin")).toBeNull();
  });
});

describe("readPathFromLoginShell", () => {
  it("uses a shell-agnostic printenv PATH probe", () => {
    const execFile = vi.fn<
      (
        file: string,
        args: ReadonlyArray<string>,
        options: { encoding: "utf8"; timeout: number },
      ) => string
    >(() => "__T3CODE_ENV_PATH_START__\n/a:/b\n__T3CODE_ENV_PATH_END__\n");

    expect(readPathFromLoginShell("/opt/homebrew/bin/fish", execFile)).toBe("/a:/b");
    expect(execFile).toHaveBeenCalledTimes(1);

    const firstCall = execFile.mock.calls[0] as
      | [string, ReadonlyArray<string>, { encoding: "utf8"; timeout: number }]
      | undefined;
    expect(firstCall).toBeDefined();
    if (!firstCall) {
      throw new Error("Expected execFile to be called");
    }

    const [shell, args, options] = firstCall;
    expect(shell).toBe("/opt/homebrew/bin/fish");
    expect(args).toHaveLength(2);
    expect(args?.[0]).toBe("-ilc");
    expect(args?.[1]).toContain("printenv PATH || true");
    expect(args?.[1]).toContain("__T3CODE_ENV_PATH_START__");
    expect(args?.[1]).toContain("__T3CODE_ENV_PATH_END__");
    expect(options).toEqual({ encoding: "utf8", timeout: 5000 });
  });
});

describe("readEnvironmentFromLoginShell", () => {
  it("extracts multiple environment variables from a login shell command", () => {
    const execFile = vi.fn<
      (
        file: string,
        args: ReadonlyArray<string>,
        options: { encoding: "utf8"; timeout: number },
      ) => string
    >(() =>
      [
        "__T3CODE_ENV_PATH_START__",
        "/a:/b",
        "__T3CODE_ENV_PATH_END__",
        "__T3CODE_ENV_SSH_AUTH_SOCK_START__",
        "/tmp/secretive.sock",
        "__T3CODE_ENV_SSH_AUTH_SOCK_END__",
      ].join("\n"),
    );

    expect(readEnvironmentFromLoginShell("/bin/zsh", ["PATH", "SSH_AUTH_SOCK"], execFile)).toEqual({
      PATH: "/a:/b",
      SSH_AUTH_SOCK: "/tmp/secretive.sock",
    });
    expect(execFile).toHaveBeenCalledTimes(1);
  });

  it("omits environment variables that are missing or empty", () => {
    const execFile = vi.fn<
      (
        file: string,
        args: ReadonlyArray<string>,
        options: { encoding: "utf8"; timeout: number },
      ) => string
    >(() =>
      [
        "__T3CODE_ENV_PATH_START__",
        "/a:/b",
        "__T3CODE_ENV_PATH_END__",
        "__T3CODE_ENV_SSH_AUTH_SOCK_START__",
        "__T3CODE_ENV_SSH_AUTH_SOCK_END__",
      ].join("\n"),
    );

    expect(readEnvironmentFromLoginShell("/bin/zsh", ["PATH", "SSH_AUTH_SOCK"], execFile)).toEqual({
      PATH: "/a:/b",
    });
  });

  it("preserves surrounding whitespace in captured values", () => {
    const execFile = vi.fn<
      (
        file: string,
        args: ReadonlyArray<string>,
        options: { encoding: "utf8"; timeout: number },
      ) => string
    >(() =>
      ["__T3CODE_ENV_CUSTOM_VAR_START__", "  padded value  ", "__T3CODE_ENV_CUSTOM_VAR_END__"].join(
        "\n",
      ),
    );

    expect(readEnvironmentFromLoginShell("/bin/zsh", ["CUSTOM_VAR"], execFile)).toEqual({
      CUSTOM_VAR: "  padded value  ",
    });
  });
});