import json
import os
import subprocess
from pathlib import Path


def test_create_instance_writes_default_max_tool_iterations(tmp_path) -> None:
    app_instance_dir = Path(__file__).resolve().parents[3]
    fake_bin = tmp_path / "bin"
    fake_bin.mkdir()
    docker = fake_bin / "docker"
    docker.write_text(
        """#!/usr/bin/env bash
set -euo pipefail
case "${1:-}" in
  image)
    [[ "${2:-}" == "inspect" ]]
    exit 0
    ;;
  container)
    [[ "${2:-}" == "inspect" ]]
    exit 1
    ;;
  run)
    exit 0
    ;;
  *)
    echo "unexpected docker command: $*" >&2
    exit 1
    ;;
esac
""",
        encoding="utf-8",
    )
    docker.chmod(0o755)

    env = os.environ.copy()
    env["PATH"] = f"{fake_bin}:{env['PATH']}"
    instances_root = tmp_path / "instances"
    result = subprocess.run(
        [
            str(app_instance_dir / "create-instance.sh"),
            "--instance-id",
            "default-tools",
            "--auth-username",
            "steven",
            "--auth-password",
            "secret",
            "--skip-provider-config",
            "--host-port",
            "29001",
            "--instances-root",
            str(instances_root),
            "--registry",
            str(tmp_path / "registry.json"),
            "--skip-initial-skills",
        ],
        cwd=app_instance_dir,
        env=env,
        text=True,
        capture_output=True,
        check=False,
    )

    assert result.returncode == 0, result.stderr
    config_path = instances_root / "default-tools" / "beaver-home" / "config.json"
    config = json.loads(config_path.read_text(encoding="utf-8"))

    assert config["agents"]["defaults"]["maxToolIterations"] == 100