from os import environ
from pathlib import Path
from contextlib import contextmanager
from tempfile import TemporaryDirectory
from textwrap import dedent
import pytest

from sanic import Sanic
from sanic.config import Config, DEFAULT_CONFIG
from sanic.exceptions import PyFileError


@contextmanager
def temp_path():
    """ a simple cross platform replacement for NamedTemporaryFile """
    with TemporaryDirectory() as td:
        yield Path(td, "file")


def test_load_from_object(app):
    class Config:
        not_for_config = "should not be used"
        CONFIG_VALUE = "should be used"

    app.config.from_object(Config)
    assert "CONFIG_VALUE" in app.config
    assert app.config.CONFIG_VALUE == "should be used"
    assert "not_for_config" not in app.config


def test_auto_load_env():
    environ["SANIC_TEST_ANSWER"] = "42"
    app = Sanic()
    assert app.config.TEST_ANSWER == 42
    del environ["SANIC_TEST_ANSWER"]


def test_auto_load_bool_env():
    environ["SANIC_TEST_ANSWER"] = "True"
    app = Sanic()
    assert app.config.TEST_ANSWER == True
    del environ["SANIC_TEST_ANSWER"]


def test_dont_load_env():
    environ["SANIC_TEST_ANSWER"] = "42"
    app = Sanic(load_env=False)
    assert getattr(app.config, "TEST_ANSWER", None) is None
    del environ["SANIC_TEST_ANSWER"]


def test_load_env_prefix():
    environ["MYAPP_TEST_ANSWER"] = "42"
    app = Sanic(load_env="MYAPP_")
    assert app.config.TEST_ANSWER == 42
    del environ["MYAPP_TEST_ANSWER"]


def test_load_env_prefix_float_values():
    environ["MYAPP_TEST_ROI"] = "2.3"
    app = Sanic(load_env="MYAPP_")
    assert app.config.TEST_ROI == 2.3
    del environ["MYAPP_TEST_ROI"]


def test_load_env_prefix_string_value():
    environ["MYAPP_TEST_TOKEN"] = "somerandomtesttoken"
    app = Sanic(load_env="MYAPP_")
    assert app.config.TEST_TOKEN == "somerandomtesttoken"
    del environ["MYAPP_TEST_TOKEN"]


def test_load_from_file(app):
    config = dedent(
        """
    VALUE = 'some value'
    condition = 1 == 1
    if condition:
        CONDITIONAL = 'should be set'
    """
    )
    with temp_path() as config_path:
        config_path.write_text(config)
        app.config.from_pyfile(str(config_path))
        assert "VALUE" in app.config
        assert app.config.VALUE == "some value"
        assert "CONDITIONAL" in app.config
        assert app.config.CONDITIONAL == "should be set"
        assert "condition" not in app.config


def test_load_from_missing_file(app):
    with pytest.raises(IOError):
        app.config.from_pyfile("non-existent file")


def test_load_from_envvar(app):
    config = "VALUE = 'some value'"
    with temp_path() as config_path:
        config_path.write_text(config)
        environ["APP_CONFIG"] = str(config_path)
        app.config.from_envvar("APP_CONFIG")
        assert "VALUE" in app.config
        assert app.config.VALUE == "some value"


def test_load_from_missing_envvar(app):
    with pytest.raises(RuntimeError) as e:
        app.config.from_envvar("non-existent variable")
        assert str(e.value) == (
            "The environment variable 'non-existent "
            "variable' is not set and thus configuration "
            "could not be loaded."
        )


def test_load_config_from_file_invalid_syntax(app):
    config = "VALUE = some value"
    with temp_path() as config_path:
        config_path.write_text(config)

        with pytest.raises(PyFileError):
            app.config.from_pyfile(config_path)


def test_overwrite_exisiting_config(app):
    app.config.DEFAULT = 1

    class Config:
        DEFAULT = 2

    app.config.from_object(Config)
    assert app.config.DEFAULT == 2


def test_overwrite_exisiting_config_ignore_lowercase(app):
    app.config.default = 1

    class Config:
        default = 2

    app.config.from_object(Config)
    assert app.config.default == 1


def test_missing_config(app):
    with pytest.raises(AttributeError) as e:
        app.config.NON_EXISTENT
        assert str(e.value) == ("Config has no 'NON_EXISTENT'")


def test_config_defaults():
    """
    load DEFAULT_CONFIG
    """
    conf = Config()
    for key, value in DEFAULT_CONFIG.items():
        assert getattr(conf, key) == value


def test_config_custom_defaults():
    """
    we should have all the variables from defaults rewriting them with custom defaults passed in
    Config
    """
    custom_defaults = {
        "REQUEST_MAX_SIZE": 1,
        "KEEP_ALIVE": False,
        "ACCESS_LOG": False
    }
    conf = Config(defaults=custom_defaults)
    for key, value in DEFAULT_CONFIG.items():
        if key in custom_defaults.keys():
            value = custom_defaults[key]
        assert getattr(conf, key) == value


def test_config_custom_defaults_with_env():
    """
    test that environment variables has higher priority than DEFAULT_CONFIG and passed defaults dict
    """
    custom_defaults = {
        "REQUEST_MAX_SIZE123": 1,
        "KEEP_ALIVE123": False,
        "ACCESS_LOG123": False
    }

    environ_defaults = {
        "SANIC_REQUEST_MAX_SIZE123": "2",
        "SANIC_KEEP_ALIVE123": "True",
        "SANIC_ACCESS_LOG123": "False"
    }

    for key, value in environ_defaults.items():
        environ[key] = value

    conf = Config(defaults=custom_defaults)
    for key, value in DEFAULT_CONFIG.items():
        if "SANIC_" + key in environ_defaults.keys():
            value = environ_defaults["SANIC_" + key]
            try:
                value = int(value)
            except ValueError:
                if value in ['True', 'False']:
                    value = value == 'True'

        assert getattr(conf, key) == value

    for key, value in environ_defaults.items():
        del environ[key]


def test_config_access_log_passing_in_run(app):
    assert app.config.ACCESS_LOG == True

    @app.listener('after_server_start')
    async def _request(sanic, loop):
        app.stop()

    app.run(port=1340, access_log=False)
    assert app.config.ACCESS_LOG == False

    app.run(port=1340, access_log=True)
    assert app.config.ACCESS_LOG == True


async def test_config_access_log_passing_in_create_server(app):
    assert app.config.ACCESS_LOG == True

    @app.listener('after_server_start')
    async def _request(sanic, loop):
        app.stop()

    await app.create_server(port=1341, access_log=False,
                            return_asyncio_server=True)
    assert app.config.ACCESS_LOG == False

    await app.create_server(port=1342, access_log=True,
                            return_asyncio_server=True)
    assert app.config.ACCESS_LOG == True


def test_config_rewrite_keep_alive():
    config = Config()
    assert config.KEEP_ALIVE == DEFAULT_CONFIG["KEEP_ALIVE"]
    config = Config(keep_alive=True)
    assert config.KEEP_ALIVE == True
    config = Config(keep_alive=False)
    assert config.KEEP_ALIVE == False

    # use defaults
    config = Config(defaults={"KEEP_ALIVE": False})
    assert config.KEEP_ALIVE == False
    config = Config(defaults={"KEEP_ALIVE": True})
    assert config.KEEP_ALIVE == True