import json
import os
import shutil
from contextlib import contextmanager
from datetime import datetime
from unittest import mock
from pathlib import Path
from typing import Iterator

import pytest

from .fixtures import FILE_PATH_ARG, UNICODE
from httpie.context import Environment
from httpie.encoding import UTF8
from httpie.plugins import AuthPlugin
from httpie.plugins.builtin import HTTPBasicAuth
from httpie.plugins.registry import plugin_manager
from httpie.sessions import Session
from httpie.utils import get_expired_cookies
from .test_auth_plugins import basic_auth
from .utils import DUMMY_HOST, HTTP_OK, MockEnvironment, http, mk_config_dir
from base64 import b64encode


class SessionTestBase:

    def start_session(self, httpbin):
        """Create and reuse a unique config dir for each test."""
        self.config_dir = mk_config_dir()

    def teardown_method(self, method):
        shutil.rmtree(self.config_dir)

    def env(self):
        """
        Return an environment.

        Each environment created within a test method
        will share the same config_dir. It is necessary
        for session files being reused.

        """
        return MockEnvironment(config_dir=self.config_dir)


class CookieTestBase:
    def setup_method(self, method):
        self.config_dir = mk_config_dir()

        orig_session = {
            'cookies': {
                'cookie1': {
                    'value': 'foo',
                },
                'cookie2': {
                    'value': 'foo',
                }
            }
        }
        self.session_path = self.config_dir / 'test-session.json'
        self.session_path.write_text(json.dumps(orig_session), encoding=UTF8)

    def teardown_method(self, method):
        shutil.rmtree(self.config_dir)


class TestSessionFlow(SessionTestBase):
    """
    These tests start with an existing session created in `setup_method()`.

    """

    def start_session(self, httpbin):
        """
        Start a full-blown session with a custom request header,
        authorization, and response cookies.

        """
        super().start_session(httpbin)
        r1 = http(
            '--follow',
            '--session=test',
            '--auth=username:password',
            'GET',
            httpbin.url + '/cookies/set?hello=world',
            'Hello:World',
            env=self.env()
        )
        assert HTTP_OK in r1

    def test_session_created_and_reused(self, httpbin):
        self.start_session(httpbin)
        # Verify that the session created in setup_method() has been used.
        r2 = http('--session=test',
                  'GET', httpbin.url + '/get', env=self.env())
        assert HTTP_OK in r2
        assert r2.json['headers']['Hello'] == 'World'
        assert r2.json['headers']['Cookie'] == 'hello=world'
        assert 'Basic ' in r2.json['headers']['Authorization']

    def test_session_update(self, httpbin):
        self.start_session(httpbin)
        # Get a response to a request from the original session.
        r2 = http('--session=test', 'GET', httpbin.url + '/get',
                  env=self.env())
        assert HTTP_OK in r2

        # Make a request modifying the session data.
        r3 = http('--follow', '--session=test', '--auth=username:password2',
                  'GET', httpbin.url + '/cookies/set?hello=world2',
                  'Hello:World2',
                  env=self.env())
        assert HTTP_OK in r3

        # Get a response to a request from the updated session.
        r4 = http('--session=test', 'GET', httpbin.url + '/get',
                  env=self.env())
        assert HTTP_OK in r4
        assert r4.json['headers']['Hello'] == 'World2'
        assert r4.json['headers']['Cookie'] == 'hello=world2'
        assert (r2.json['headers']['Authorization']
                != r4.json['headers']['Authorization'])

    def test_session_read_only(self, httpbin):
        self.start_session(httpbin)
        # Get a response from the original session.
        r2 = http('--session=test', 'GET', httpbin.url + '/get',
                  env=self.env())
        assert HTTP_OK in r2

        # Make a request modifying the session data but
        # with --session-read-only.
        r3 = http('--follow', '--session-read-only=test',
                  '--auth=username:password2', 'GET',
                  httpbin.url + '/cookies/set?hello=world2', 'Hello:World2',
                  env=self.env())
        assert HTTP_OK in r3

        # Get a response from the updated session.
        r4 = http('--session=test', 'GET', httpbin.url + '/get',
                  env=self.env())
        assert HTTP_OK in r4

        # Origin can differ on Travis.
        del r2.json['origin'], r4.json['origin']
        # Different for each request.

        # Should be the same as before r3.
        assert r2.json == r4.json

    def test_session_overwrite_header(self, httpbin):
        self.start_session(httpbin)

        r2 = http('--session=test', 'GET', httpbin.url + '/get',
                  'Hello:World2', env=self.env())
        assert HTTP_OK in r2
        assert r2.json['headers']['Hello'] == 'World2'

        r3 = http('--session=test', 'GET', httpbin.url + '/get',
                  'Hello:World2', 'Hello:World3', env=self.env())
        assert HTTP_OK in r3
        assert r3.json['headers']['Hello'] == 'World2,World3'

        r3 = http('--session=test', 'GET', httpbin.url + '/get',
                  'Hello:', 'Hello:World3', env=self.env())
        assert HTTP_OK in r3
        assert 'Hello' not in r3.json['headers']['Hello']


class TestSession(SessionTestBase):
    """Stand-alone session tests."""

    def test_session_ignored_header_prefixes(self, httpbin):
        self.start_session(httpbin)
        r1 = http('--session=test', 'GET', httpbin.url + '/get',
                  'Content-Type: text/plain',
                  'If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT',
                  env=self.env())
        assert HTTP_OK in r1
        r2 = http('--session=test', 'GET', httpbin.url + '/get',
                  env=self.env())
        assert HTTP_OK in r2
        assert 'Content-Type' not in r2.json['headers']
        assert 'If-Unmodified-Since' not in r2.json['headers']

    def test_session_with_upload(self, httpbin):
        self.start_session(httpbin)
        r = http('--session=test', '--form', '--verbose', 'POST', httpbin.url + '/post',
                 f'test-file@{FILE_PATH_ARG}', 'foo=bar', env=self.env())
        assert HTTP_OK in r

    def test_session_by_path(self, httpbin):
        self.start_session(httpbin)
        session_path = self.config_dir / 'session-by-path.json'
        r1 = http('--session', str(session_path), 'GET', httpbin.url + '/get',
                  'Foo:Bar', env=self.env())
        assert HTTP_OK in r1

        r2 = http('--session', str(session_path), 'GET', httpbin.url + '/get',
                  env=self.env())
        assert HTTP_OK in r2
        assert r2.json['headers']['Foo'] == 'Bar'

    def test_session_with_cookie_followed_by_another_header(self, httpbin):
        """
        Make sure headers don’t get mutated — <https://github.com/httpie/httpie/issues/1126>
        """
        self.start_session(httpbin)
        session_data = {
            'headers': {
                'cookie': '...',
                'zzz': '...'
            }
        }
        session_path = self.config_dir / 'session-data.json'
        session_path.write_text(json.dumps(session_data))
        r = http('--session', str(session_path), 'GET', httpbin.url + '/get',
                 env=self.env())
        assert HTTP_OK in r
        assert 'Zzz' in r

    def test_session_unicode(self, httpbin):
        self.start_session(httpbin)

        r1 = http('--session=test', f'--auth=test:{UNICODE}',
                  'GET', httpbin.url + '/get', f'Test:{UNICODE}',
                  env=self.env())
        assert HTTP_OK in r1

        r2 = http('--session=test', '--verbose', 'GET',
                  httpbin.url + '/get', env=self.env())
        assert HTTP_OK in r2

        # FIXME: Authorization *sometimes* is not present
        assert (r2.json['headers']['Authorization']
                == HTTPBasicAuth.make_header('test', UNICODE))
        # httpbin doesn't interpret UTF-8 headers
        assert UNICODE in r2

    def test_session_default_header_value_overwritten(self, httpbin):
        self.start_session(httpbin)
        # https://github.com/httpie/httpie/issues/180
        r1 = http('--session=test',
                  httpbin.url + '/headers', 'User-Agent:custom',
                  env=self.env())
        assert HTTP_OK in r1
        assert r1.json['headers']['User-Agent'] == 'custom'

        r2 = http('--session=test', httpbin.url + '/headers', env=self.env())
        assert HTTP_OK in r2
        assert r2.json['headers']['User-Agent'] == 'custom'

    def test_download_in_session(self, tmp_path, httpbin):
        # https://github.com/httpie/httpie/issues/412
        self.start_session(httpbin)
        cwd = os.getcwd()
        os.chdir(tmp_path)
        try:
            http('--session=test', '--download',
                 httpbin.url + '/get', env=self.env())
        finally:
            os.chdir(cwd)

    @pytest.mark.parametrize(
        'auth_require_param, auth_parse_param',
        [
            (False, False),
            (False, True),
            (True, False)
        ]
    )
    def test_auth_type_reused_in_session(self, auth_require_param, auth_parse_param, httpbin):
        self.start_session(httpbin)
        session_path = self.config_dir / 'test-session.json'

        header = 'Custom dXNlcjpwYXNzd29yZA'

        class Plugin(AuthPlugin):
            auth_type = 'test-reused'
            auth_require = auth_require_param
            auth_parse = auth_parse_param

            def get_auth(self, username=None, password=None):
                return basic_auth(header=f'{header}==')

        plugin_manager.register(Plugin)

        r1 = http(
            '--session', str(session_path),
            httpbin + '/basic-auth/user/password',
            '--auth-type',
            Plugin.auth_type,
            '--auth', 'user:password',
            '--print=H',
        )

        r2 = http(
            '--session', str(session_path),
            httpbin + '/basic-auth/user/password',
            '--print=H',
        )
        assert f'Authorization: {header}' in r1
        assert f'Authorization: {header}' in r2
        plugin_manager.unregister(Plugin)

    def test_auth_plugin_prompt_password_in_session(self, httpbin):
        self.start_session(httpbin)
        session_path = self.config_dir / 'test-session.json'

        class Plugin(AuthPlugin):
            auth_type = 'test-prompted'

            def get_auth(self, username=None, password=None):
                basic_auth_header = 'Basic ' + b64encode(self.raw_auth.encode()).strip().decode('latin1')
                return basic_auth(basic_auth_header)

        plugin_manager.register(Plugin)

        with mock.patch(
            'httpie.cli.argtypes.AuthCredentials._getpass',
            new=lambda self, prompt: 'password'
        ):
            r1 = http(
                '--session', str(session_path),
                httpbin + '/basic-auth/user/password',
                '--auth-type',
                Plugin.auth_type,
                '--auth', 'user',
            )

        r2 = http(
            '--session', str(session_path),
            httpbin + '/basic-auth/user/password',
        )
        assert HTTP_OK in r1
        assert HTTP_OK in r2

        # additional test for issue: https://github.com/httpie/httpie/issues/1098
        with open(session_path) as session_file:
            session_file_lines = ''.join(session_file.readlines())
            assert "\"type\": \"test-prompted\"" in session_file_lines
            assert "\"raw_auth\": \"user:password\"" in session_file_lines

        plugin_manager.unregister(Plugin)

    def test_auth_type_stored_in_session_file(self, httpbin):
        self.config_dir = mk_config_dir()
        self.session_path = self.config_dir / 'test-session.json'

        class Plugin(AuthPlugin):
            auth_type = 'test-saved'
            auth_require = True

            def get_auth(self, username=None, password=None):
                return basic_auth()

        plugin_manager.register(Plugin)
        http('--session', str(self.session_path),
             httpbin + '/basic-auth/user/password',
             '--auth-type',
             Plugin.auth_type,
             '--auth', 'user:password',
             )
        updated_session = json.loads(self.session_path.read_text(encoding=UTF8))
        assert updated_session['auth']['type'] == 'test-saved'
        assert updated_session['auth']['raw_auth'] == 'user:password'
        plugin_manager.unregister(Plugin)


class TestExpiredCookies(CookieTestBase):

    @pytest.mark.parametrize(
        'initial_cookie, expired_cookie',
        [
            ({'id': {'value': 123}}, {'name': 'id'}),
            ({'id': {'value': 123}}, {'name': 'token'})
        ]
    )
    def test_removes_expired_cookies_from_session_obj(self, initial_cookie, expired_cookie, httpbin, mock_env):
        session = Session(self.config_dir, env=mock_env, session_id=None, bound_host=None)
        session['cookies'] = initial_cookie
        session.remove_cookies([expired_cookie])
        assert expired_cookie not in session.cookies

    def test_expired_cookies(self, httpbin):
        r = http(
            '--session', str(self.session_path),
            '--print=H',
            httpbin.url + '/cookies/delete?cookie2',
        )
        assert 'Cookie: cookie1=foo; cookie2=foo' in r

        updated_session = json.loads(self.session_path.read_text(encoding=UTF8))
        assert 'cookie1' in updated_session['cookies']
        assert 'cookie2' not in updated_session['cookies']

    def test_get_expired_cookies_using_max_age(self):
        cookies = 'one=two; Max-Age=0; path=/; domain=.tumblr.com; HttpOnly'
        expected_expired = [
            {'name': 'one', 'path': '/'}
        ]
        assert get_expired_cookies(cookies, now=None) == expected_expired

    @pytest.mark.parametrize(
        'cookies, now, expected_expired',
        [
            (
                'hello=world; Path=/; Expires=Thu, 01-Jan-1970 00:00:00 GMT; HttpOnly',
                None,
                [
                    {
                        'name': 'hello',
                        'path': '/'
                    }
                ]
            ),
            (
                (
                    'hello=world; Path=/; Expires=Thu, 01-Jan-1970 00:00:00 GMT; HttpOnly, '
                    'pea=pod; Path=/ab; Expires=Thu, 01-Jan-1970 00:00:00 GMT; HttpOnly'
                ),
                None,
                [
                    {'name': 'hello', 'path': '/'},
                    {'name': 'pea', 'path': '/ab'}
                ]
            ),
            (
                # Checks we gracefully ignore expires date in invalid format.
                # <https://github.com/httpie/httpie/issues/963>
                'pfg=; Expires=Sat, 19-Sep-2020 06:58:14 GMT+0000; Max-Age=0; path=/; domain=.tumblr.com; secure; HttpOnly',
                None,
                []
            ),
            (
                'hello=world; Path=/; Expires=Fri, 12 Jun 2020 12:28:55 GMT; HttpOnly',
                datetime(2020, 6, 11).timestamp(),
                []
            ),
        ]
    )
    def test_get_expired_cookies_manages_multiple_cookie_headers(self, cookies, now, expected_expired):
        assert get_expired_cookies(cookies, now=now) == expected_expired


class TestCookieStorage(CookieTestBase):

    @pytest.mark.parametrize(
        'new_cookies, new_cookies_dict, expected',
        [(
            'new=bar',
            {'new': 'bar'},
            'cookie1=foo; cookie2=foo; new=bar'
        ),
            (
            'new=bar;chocolate=milk',
            {'new': 'bar', 'chocolate': 'milk'},
            'chocolate=milk; cookie1=foo; cookie2=foo; new=bar'
        ),
            (
            'new=bar; chocolate=milk',
            {'new': 'bar', 'chocolate': 'milk'},
            'chocolate=milk; cookie1=foo; cookie2=foo; new=bar'
        ),
            (
            'new=bar;; chocolate=milk;;;',
            {'new': 'bar', 'chocolate': 'milk'},
            'cookie1=foo; cookie2=foo; new=bar'
        ),
            (
            'new=bar; chocolate=milk;;;',
            {'new': 'bar', 'chocolate': 'milk'},
            'chocolate=milk; cookie1=foo; cookie2=foo; new=bar'
        )
        ]
    )
    def test_existing_and_new_cookies_sent_in_request(self, new_cookies, new_cookies_dict, expected, httpbin):
        r = http(
            '--session', str(self.session_path),
            '--print=H',
            httpbin.url,
            'Cookie:' + new_cookies,
        )
        # Note: cookies in response are in alphabetical order
        assert f'Cookie: {expected}' in r

        updated_session = json.loads(self.session_path.read_text(encoding=UTF8))
        for name, value in new_cookies_dict.items():
            assert name, value in updated_session['cookies']
            assert 'Cookie' not in updated_session['headers']

    @pytest.mark.parametrize(
        'cli_cookie, set_cookie, expected',
        [(
            '',
            '/cookies/set/cookie1/bar',
            'bar'
        ),
            (
            'cookie1=not_foo',
            '/cookies/set/cookie1/bar',
            'bar'
        ),
            (
            'cookie1=not_foo',
            '',
            'not_foo'
        ),
            (
            '',
            '',
            'foo'
        )
        ]
    )
    def test_cookie_storage_priority(self, cli_cookie, set_cookie, expected, httpbin):
        """
        Expected order of priority for cookie storage in session file:
        1. set-cookie (from server)
        2. command line arg
        3. cookie already stored in session file
        """
        http(
            '--session', str(self.session_path),
            httpbin.url + set_cookie,
            'Cookie:' + cli_cookie,
        )
        updated_session = json.loads(self.session_path.read_text(encoding=UTF8))

        assert updated_session['cookies']['cookie1']['value'] == expected


@pytest.fixture
def basic_session(httpbin, tmp_path):
    session_path = tmp_path / 'session.json'
    http(
        '--session', str(session_path),
        httpbin + '/get'
    )
    return session_path


@contextmanager
def open_session(path: Path, env: Environment, read_only: bool = False) -> Iterator[Session]:
    session = Session(path, env, session_id='test', bound_host=DUMMY_HOST)
    session.load()
    yield session
    if not read_only:
        session.save()


@contextmanager
def open_raw_session(path: Path, read_only: bool = False) -> None:
    with open(path) as stream:
        raw_session = json.load(stream)

    yield raw_session

    if not read_only:
        with open(path, 'w') as stream:
            json.dump(raw_session, stream)


def read_stderr(env: Environment) -> bytes:
    env.stderr.seek(0)
    stderr_data = env.stderr.read()
    if isinstance(stderr_data, str):
        return stderr_data.encode()
    else:
        return stderr_data


def test_old_session_version_saved_as_is(basic_session, mock_env):
    with open_session(basic_session, mock_env) as session:
        session['__meta__'] = {'httpie': '0.0.1'}

    with open_session(basic_session, mock_env, read_only=True) as session:
        assert session['__meta__']['httpie'] == '0.0.1'


def test_old_session_cookie_layout_warning(basic_session, mock_env):
    with open_session(basic_session, mock_env) as session:
        # Use the old layout & set a cookie
        session['cookies'] = {}
        session.cookies.set('foo', 'bar')

    assert read_stderr(mock_env) == b''

    with open_session(basic_session, mock_env, read_only=True) as session:
        assert b'Outdated layout detected' in read_stderr(mock_env)


@pytest.mark.parametrize('cookies, expect_warning', [
    # Old-style cookie format
    (
        # Without 'domain' set
        {'foo': {'value': 'bar'}},
        True
    ),
    (
        # With 'domain' set to empty string
        {'foo': {'value': 'bar', 'domain': ''}},
        True
    ),
    (
        # With 'domain' set to null
        {'foo': {'value': 'bar', 'domain': None}},
        False,
    ),
    (
        # With 'domain' set to a URL
        {'foo': {'value': 'bar', 'domain': DUMMY_HOST}},
        False,
    ),
    # New style cookie format
    (
        # Without 'domain' set
        [{'name': 'foo', 'value': 'bar'}],
        False
    ),
    (
        # With 'domain' set to empty string
        [{'name': 'foo', 'value': 'bar', 'domain': ''}],
        False
    ),
    (
        # With 'domain' set to null
        [{'name': 'foo', 'value': 'bar', 'domain': None}],
        False,
    ),
    (
        # With 'domain' set to a URL
        [{'name': 'foo', 'value': 'bar', 'domain': DUMMY_HOST}],
        False,
    ),
])
def test_cookie_security_warnings_on_raw_cookies(basic_session, mock_env, cookies, expect_warning):
    with open_raw_session(basic_session) as raw_session:
        raw_session['cookies'] = cookies

    with open_session(basic_session, mock_env, read_only=True):
        warning = b'Outdated layout detected'
        stderr = read_stderr(mock_env)

        if expect_warning:
            assert warning in stderr
        else:
            assert warning not in stderr


def test_old_session_cookie_layout_loading(basic_session, httpbin, mock_env):
    with open_session(basic_session, mock_env) as session:
        # Use the old layout & set a cookie
        session['cookies'] = {}
        session.cookies.set('foo', 'bar')

    response = http(
        '--session', str(basic_session),
        httpbin + '/cookies'
    )
    assert response.json['cookies'] == {'foo': 'bar'}


@pytest.mark.parametrize('layout_type', [
    dict, list
])
def test_session_cookie_layout_preservance(basic_session, mock_env, layout_type):
    with open_session(basic_session, mock_env) as session:
        session['cookies'] = layout_type()
        session.cookies.set('foo', 'bar')
        session.save()

    with open_session(basic_session, mock_env, read_only=True) as session:
        assert isinstance(session['cookies'], layout_type)


@pytest.mark.parametrize('layout_type', [
    dict, list
])
def test_session_cookie_layout_preservance_on_new_cookies(basic_session, httpbin, mock_env, layout_type):
    with open_session(basic_session, mock_env) as session:
        session['cookies'] = layout_type()
        session.cookies.set('foo', 'bar')
        session.save()

    http(
        '--session', str(basic_session),
        httpbin + '/cookies/set/baz/quux'
    )

    with open_session(basic_session, mock_env, read_only=True) as session:
        assert isinstance(session['cookies'], layout_type)
