import { describe, expect, test } from "bun:test";
import { buildShellLaunchers } from "../../tools/impl/shellLaunchers";

describe("Shell Launchers", () => {
  test("builds launchers for a command", () => {
    const launchers = buildShellLaunchers("echo hello");
    expect(launchers.length).toBeGreaterThan(0);
    expect(launchers[0]).toBeDefined();
  });

  test("returns empty array for empty command", () => {
    const launchers = buildShellLaunchers("");
    expect(launchers).toEqual([]);
  });

  test("returns empty array for whitespace-only command", () => {
    const launchers = buildShellLaunchers("   ");
    expect(launchers).toEqual([]);
  });

  if (process.platform === "win32") {
    describe("Windows-specific", () => {
      test("PowerShell is tried before cmd.exe", () => {
        const launchers = buildShellLaunchers("echo test");

        // Find indices of PowerShell and cmd.exe
        const powershellIndex = launchers.findIndex(
          (l) =>
            l[0]?.toLowerCase().includes("powershell") ||
            l[0]?.toLowerCase() === "pwsh",
        );
        const cmdIndex = launchers.findIndex(
          (l) =>
            l[0]?.toLowerCase().includes("cmd") ||
            l[0]?.toLowerCase() === process.env.ComSpec?.toLowerCase(),
        );

        expect(powershellIndex).toBeGreaterThanOrEqual(0);
        expect(cmdIndex).toBeGreaterThanOrEqual(0);
        // PowerShell should come before cmd.exe
        expect(powershellIndex).toBeLessThan(cmdIndex);
      });

      test("includes PowerShell with -NoProfile flag", () => {
        const launchers = buildShellLaunchers("echo test");
        const powershellLauncher = launchers.find((l) =>
          l[0]?.toLowerCase().includes("powershell"),
        );

        expect(powershellLauncher).toBeDefined();
        expect(powershellLauncher).toContain("-NoProfile");
        expect(powershellLauncher).toContain("-Command");
      });
    });
  } else {
    describe("Unix-specific", () => {
      test("includes bash with -lc flag", () => {
        const launchers = buildShellLaunchers("echo test");
        const bashLauncher = launchers.find(
          (l) => l[0]?.includes("bash") && l[1] === "-lc",
        );

        expect(bashLauncher).toBeDefined();
      });

      test("prefers user SHELL environment", () => {
        const originalShell = process.env.SHELL;
        process.env.SHELL = "/bin/zsh";

        try {
          const launchers = buildShellLaunchers("echo test");
          // User's shell should be first
          expect(launchers[0]?.[0]).toBe("/bin/zsh");
        } finally {
          if (originalShell === undefined) delete process.env.SHELL;
          else process.env.SHELL = originalShell;
        }
      });
    });
  }
});