import os
import subprocess
import sys
from unittest.mock import patch

import fastapi.cli
import pytest


def test_fastapi_cli():
    result = subprocess.run(
        [
            sys.executable,
            "-m",
            "coverage",
            "run",
            "-m",
            "fastapi",
            "dev",
            "non_existent_file.py",
        ],
        capture_output=True,
        encoding="utf-8",
        # On Windows, the default console encoding (e.g., cp1252) cannot handle certain
        # Unicode characters like emojis (🚀) printed by FastAPI's CLI. This causes a
        # UnicodeEncodeError before the CLI can print the expected error message.
        # Setting PYTHONIOENCODING to UTF-8 ensures that stdout/stderr streams support
        # full Unicode output and the test runs reliably across platforms.
        env={**os.environ, "PYTHONIOENCODING": "utf-8"},
    )
    assert result.returncode == 1, result.stdout
    assert "Path does not exist non_existent_file.py" in result.stdout


def test_fastapi_cli_not_installed():
    with patch.object(fastapi.cli, "cli_main", None):
        with pytest.raises(RuntimeError) as exc_info:
            fastapi.cli.main()
        assert "To use the fastapi command, please install" in str(exc_info.value)