import { describe, expect, test } from "bun:test";
import { spawn } from "node:child_process";

/**
 * Startup flow tests that validate flag conflict handling.
 *
 * These must remain runnable in fork PR CI (no secrets), so they should not
 * require a working Letta server or LETTA_API_KEY.
 */

const projectRoot = process.cwd();

async function runCli(
  args: string[],
  options: {
    timeoutMs?: number;
    expectExit?: number;
  } = {},
): Promise<{ stdout: string; stderr: string; exitCode: number | null }> {
  const { timeoutMs = 30000, expectExit } = options;

  return new Promise((resolve, reject) => {
    const proc = spawn("bun", ["run", "dev", ...args], {
      cwd: projectRoot,
      // Mark as subagent to prevent polluting user's LRU settings
      env: { ...process.env, LETTA_CODE_AGENT_ROLE: "subagent" },
    });

    let stdout = "";
    let stderr = "";

    proc.stdout?.on("data", (data) => {
      stdout += data.toString();
    });

    proc.stderr?.on("data", (data) => {
      stderr += data.toString();
    });

    const timeout = setTimeout(() => {
      proc.kill();
      reject(
        new Error(
          `Timeout after ${timeoutMs}ms. stdout: ${stdout}, stderr: ${stderr}`,
        ),
      );
    }, timeoutMs);

    proc.on("close", (code) => {
      clearTimeout(timeout);
      if (expectExit !== undefined && code !== expectExit) {
        reject(
          new Error(
            `Expected exit code ${expectExit}, got ${code}. stdout: ${stdout}, stderr: ${stderr}`,
          ),
        );
      } else {
        resolve({ stdout, stderr, exitCode: code });
      }
    });

    proc.on("error", (err) => {
      clearTimeout(timeout);
      reject(err);
    });
  });
}

describe("Startup Flow - Flag Conflicts", () => {
  test("--conversation conflicts with --agent", async () => {
    const result = await runCli(
      ["--conversation", "conv-123", "--agent", "agent-123"],
      { expectExit: 1 },
    );
    expect(result.stderr).toContain(
      "--conversation cannot be used with --agent",
    );
  });

  test("--conversation conflicts with --new-agent", async () => {
    const result = await runCli(["--conversation", "conv-123", "--new-agent"], {
      expectExit: 1,
    });
    expect(result.stderr).toContain(
      "--conversation cannot be used with --new-agent",
    );
  });

  test("--conversation conflicts with --resume", async () => {
    const result = await runCli(["--conversation", "conv-123", "--resume"], {
      expectExit: 1,
    });
    expect(result.stderr).toContain(
      "--conversation cannot be used with --resume",
    );
  });

  test("--conversation conflicts with --continue", async () => {
    const result = await runCli(["--conversation", "conv-123", "--continue"], {
      expectExit: 1,
    });
    expect(result.stderr).toContain(
      "--conversation cannot be used with --continue",
    );
  });

  test("--conversation conflicts with --import", async () => {
    const result = await runCli(
      ["--conversation", "conv-123", "--import", "test.af"],
      { expectExit: 1 },
    );
    expect(result.stderr).toContain(
      "--conversation cannot be used with --import",
    );
  });

  test("--conversation conflicts with legacy --from-af using canonical --import error text", async () => {
    const result = await runCli(
      ["--conversation", "conv-123", "--from-af", "test.af"],
      { expectExit: 1 },
    );
    expect(result.stderr).toContain(
      "--conversation cannot be used with --import",
    );
    expect(result.stderr).not.toContain(
      "--conversation cannot be used with --from-af",
    );
  });

  test("--conversation conflicts with --name", async () => {
    const result = await runCli(
      ["--conversation", "conv-123", "--name", "MyAgent"],
      { expectExit: 1 },
    );
    expect(result.stderr).toContain(
      "--conversation cannot be used with --name",
    );
  });

  test("--import conflicts with --name (including legacy --from-af alias)", async () => {
    const result = await runCli(["--from-af", "test.af", "--name", "MyAgent"], {
      expectExit: 1,
    });
    expect(result.stderr).toContain("--import cannot be used with --name");
    expect(result.stderr).not.toContain("--from-af cannot be used with --name");
  });
});

describe("Startup Flow - Smoke", () => {
  test("--name conflicts with --new-agent", async () => {
    const result = await runCli(["--name", "MyAgent", "--new-agent"], {
      expectExit: 1,
    });
    expect(result.stderr).toContain("--name cannot be used with --new-agent");
  });

  test("--new + --name does not conflict (new conversation on named agent)", async () => {
    const result = await runCli(
      ["-p", "Say OK", "--new", "--name", "NonExistentAgent999"],
      { expectExit: 1 },
    );
    // Should get past flag validation regardless of whether credentials exist.
    expect(result.stderr).not.toContain("cannot be used with");
    expect(
      result.stderr.includes("NonExistentAgent999") ||
        result.stderr.includes("Missing LETTA_API_KEY"),
    ).toBe(true);
  });

  test("--new-agent headless parses and reaches credential check", async () => {
    const result = await runCli(["--new-agent", "-p", "Say OK"], {
      expectExit: 1,
    });
    expect(result.stderr).toContain("Missing LETTA_API_KEY");
    expect(result.stderr).not.toContain("No recent session found");
  });

  test("--toolset auto is accepted", async () => {
    const result = await runCli(
      ["--new-agent", "--toolset", "auto", "-p", "Say OK"],
      {
        expectExit: 1,
      },
    );
    expect(result.stderr).toContain("Missing LETTA_API_KEY");
    expect(result.stderr).not.toContain("Invalid toolset");
  });

  test("--memfs-startup is accepted for headless startup", async () => {
    const result = await runCli(
      ["--new-agent", "-p", "Say OK", "--memfs-startup", "background"],
      {
        expectExit: 1,
      },
    );
    expect(result.stderr).toContain("Missing LETTA_API_KEY");
    expect(result.stderr).not.toContain("Unknown option '--memfs-startup'");
  });

  test("-c alias for --continue is accepted", async () => {
    const result = await runCli(["-p", "Say OK", "-c"], {
      expectExit: 1,
    });
    expect(result.stderr).toContain("Missing LETTA_API_KEY");
    expect(result.stderr).not.toContain("Unknown option '-c'");
  });

  test("-C alias for --conversation is accepted", async () => {
    const result = await runCli(["-p", "Say OK", "-C", "conv-123"], {
      expectExit: 1,
    });
    expect(result.stderr).toContain("Missing LETTA_API_KEY");
    expect(result.stderr).not.toContain("Unknown option '-C'");
  });

  test("--import handle is accepted in headless mode", async () => {
    const result = await runCli(["--import", "@author/agent", "-p", "Say OK"], {
      expectExit: 1,
    });
    expect(result.stderr).toContain("Missing LETTA_API_KEY");
    expect(result.stderr).not.toContain("Invalid registry handle");
  });

  test("--max-turns and --pre-load-skills are accepted in headless mode", async () => {
    const result = await runCli(
      [
        "--new-agent",
        "-p",
        "Say OK",
        "--max-turns",
        "2",
        "--pre-load-skills",
        "foo,bar",
      ],
      { expectExit: 1 },
    );
    expect(result.stderr).toContain("Missing LETTA_API_KEY");
    expect(result.stderr).not.toContain("Unknown option '--max-turns'");
    expect(result.stderr).not.toContain("Unknown option '--pre-load-skills'");
  });
});