import multiprocessing
import os
from pathlib import Path
from typing import Any, Dict

import pytest

import reflex as rx
import reflex.config
from reflex.config import environment
from reflex.constants import Endpoint


def test_requires_app_name():
    """Test that a config requires an app_name."""
    with pytest.raises(ValueError):
        rx.Config()  # type: ignore


def test_set_app_name(base_config_values):
    """Test that the app name is set to the value passed in.

    Args:
        base_config_values: Config values.
    """
    config = rx.Config(**base_config_values)
    assert config.app_name == base_config_values["app_name"]


@pytest.mark.parametrize(
    "env_var, value",
    [
        ("APP_NAME", "my_test_app"),
        ("FRONTEND_PORT", 3001),
        ("FRONTEND_PATH", "/test"),
        ("BACKEND_PORT", 8001),
        ("API_URL", "https://mybackend.com:8000"),
        ("DEPLOY_URL", "https://myfrontend.com"),
        ("BACKEND_HOST", "127.0.0.1"),
        ("DB_URL", "postgresql://user:pass@localhost:5432/db"),
        ("REDIS_URL", "redis://localhost:6379"),
        ("TIMEOUT", 600),
        ("TELEMETRY_ENABLED", False),
        ("TELEMETRY_ENABLED", True),
    ],
)
def test_update_from_env(
    base_config_values: Dict[str, Any],
    monkeypatch: pytest.MonkeyPatch,
    env_var: str,
    value: Any,
):
    """Test that environment variables override config values.

    Args:
        base_config_values: Config values.
        monkeypatch: The pytest monkeypatch object.
        env_var: The environment variable name.
        value: The environment variable value.
    """
    monkeypatch.setenv(env_var, str(value))
    assert os.environ.get(env_var) == str(value)
    config = rx.Config(**base_config_values)
    assert getattr(config, env_var.lower()) == value


def test_update_from_env_path(
    base_config_values: Dict[str, Any],
    monkeypatch: pytest.MonkeyPatch,
    tmp_path: Path,
):
    """Test that environment variables override config values.

    Args:
        base_config_values: Config values.
        monkeypatch: The pytest monkeypatch object.
        tmp_path: The pytest tmp_path fixture object.
    """
    monkeypatch.setenv("BUN_PATH", "/test")
    assert os.environ.get("BUN_PATH") == "/test"
    with pytest.raises(ValueError):
        rx.Config(**base_config_values)

    monkeypatch.setenv("BUN_PATH", str(tmp_path))
    assert os.environ.get("BUN_PATH") == str(tmp_path)
    config = rx.Config(**base_config_values)
    assert config.bun_path == tmp_path


@pytest.mark.parametrize(
    "kwargs, expected",
    [
        (
            {"app_name": "test_app", "api_url": "http://example.com"},
            f"{Endpoint.EVENT}",
        ),
        (
            {"app_name": "test_app", "api_url": "http://example.com/api"},
            f"/api{Endpoint.EVENT}",
        ),
    ],
)
def test_event_namespace(mocker, kwargs, expected):
    """Test the event namespace.

    Args:
        mocker: The pytest mock object.
        kwargs: The Config kwargs.
        expected: Expected namespace
    """
    conf = rx.Config(**kwargs)
    mocker.patch("reflex.config.get_config", return_value=conf)

    config = reflex.config.get_config()
    assert conf == config
    assert config.get_event_namespace() == expected


DEFAULT_CONFIG = rx.Config(app_name="a")


@pytest.mark.parametrize(
    ("config_kwargs", "env_vars", "set_persistent_vars", "exp_config_values"),
    [
        (
            {},
            {},
            {},
            {
                "api_url": DEFAULT_CONFIG.api_url,
                "backend_port": DEFAULT_CONFIG.backend_port,
                "deploy_url": DEFAULT_CONFIG.deploy_url,
                "frontend_port": DEFAULT_CONFIG.frontend_port,
            },
        ),
        # Ports set in config kwargs
        (
            {"backend_port": 8001, "frontend_port": 3001},
            {},
            {},
            {
                "api_url": "http://localhost:8001",
                "backend_port": 8001,
                "deploy_url": "http://localhost:3001",
                "frontend_port": 3001,
            },
        ),
        # Ports set in environment take precedence
        (
            {"backend_port": 8001, "frontend_port": 3001},
            {"BACKEND_PORT": 8002},
            {},
            {
                "api_url": "http://localhost:8002",
                "backend_port": 8002,
                "deploy_url": "http://localhost:3001",
                "frontend_port": 3001,
            },
        ),
        # Ports set on the command line take precedence
        (
            {"backend_port": 8001, "frontend_port": 3001},
            {"BACKEND_PORT": 8002},
            {"frontend_port": "3005"},
            {
                "api_url": "http://localhost:8002",
                "backend_port": 8002,
                "deploy_url": "http://localhost:3005",
                "frontend_port": 3005,
            },
        ),
        # api_url / deploy_url already set should not be overridden
        (
            {"api_url": "http://foo.bar:8900", "deploy_url": "http://foo.bar:3001"},
            {"BACKEND_PORT": 8002},
            {"frontend_port": "3005"},
            {
                "api_url": "http://foo.bar:8900",
                "backend_port": 8002,
                "deploy_url": "http://foo.bar:3001",
                "frontend_port": 3005,
            },
        ),
    ],
)
def test_replace_defaults(
    monkeypatch,
    config_kwargs,
    env_vars,
    set_persistent_vars,
    exp_config_values,
):
    """Test that the config replaces defaults with values from the environment.

    Args:
        monkeypatch: The pytest monkeypatch object.
        config_kwargs: The config kwargs.
        env_vars: The environment variables.
        set_persistent_vars: The values passed to config._set_persistent variables.
        exp_config_values: The expected config values.
    """
    mock_os_env = os.environ.copy()
    monkeypatch.setattr(reflex.config.os, "environ", mock_os_env)  # type: ignore
    mock_os_env.update({k: str(v) for k, v in env_vars.items()})
    c = rx.Config(app_name="a", **config_kwargs)
    c._set_persistent(**set_persistent_vars)
    for key, value in exp_config_values.items():
        assert getattr(c, key) == value


def reflex_dir_constant():
    return environment.REFLEX_DIR


def test_reflex_dir_env_var(monkeypatch, tmp_path):
    """Test that the REFLEX_DIR environment variable is used to set the Reflex.DIR constant.

    Args:
        monkeypatch: The pytest monkeypatch object.
        tmp_path: The pytest tmp_path object.
    """
    monkeypatch.setenv("REFLEX_DIR", str(tmp_path))

    mp_ctx = multiprocessing.get_context(method="spawn")
    with mp_ctx.Pool(processes=1) as pool:
        assert pool.apply(reflex_dir_constant) == tmp_path