from collections.abc import Callable
from dataclasses import dataclass, field
from types import SimpleNamespace
from typing import NoReturn

import pytest
from flask import Flask
from werkzeug.exceptions import Forbidden, UnprocessableEntity

from controllers.console import wraps as console_wraps
from controllers.console.auth import oauth as oauth_controller
from controllers.console.auth.oauth import OAuthCallback, OAuthLogin
from enums import DeploymentEdition
from libs.oauth import encode_oauth_state
from services.account_errors import (
    InvalidOAuthProviderError,
    OAuthIdentityLockUnavailableError,
    OAuthInvitationAccountMismatchError,
    OAuthProviderRequestError,
    OAuthRegistrationError,
)
from services.entities.account_entities import AccountSessionTokens
from services.entities.account_oauth_entities import (
    OAuthAuthorizationRequest,
    OAuthCallbackCommand,
    OAuthCallbackResult,
    OAuthInvitationResult,
    OAuthSignInResult,
)
from services.system_feature_service import SystemFeatureService

CONSOLE_WEB_URL = "https://console.example.com"


@dataclass
class FakeOAuthService:
    authorization_url: str = "https://provider.example/authorize"
    callback_result: OAuthCallbackResult = OAuthSignInResult(
        tokens=AccountSessionTokens("access-token", "refresh-token", "csrf-token"),
        oauth_new_user=False,
    )
    authorization_error: Exception | None = None
    callback_error: Exception | None = None
    authorization_calls: list[tuple[str, OAuthAuthorizationRequest]] = field(default_factory=list)
    callback_calls: list[OAuthCallbackCommand] = field(default_factory=list)

    def start_authorization(self, provider: str, request: OAuthAuthorizationRequest) -> str:
        self.authorization_calls.append((provider, request))
        if self.authorization_error is not None:
            raise self.authorization_error
        return self.authorization_url

    def complete_authorization(self, command: OAuthCallbackCommand) -> OAuthCallbackResult:
        self.callback_calls.append(command)
        if self.callback_error is not None:
            raise self.callback_error
        return self.callback_result


@pytest.fixture(autouse=True)
def _oauth_admission(
    config_overrides: Callable[..., None],
) -> None:
    config_overrides(
        DEPLOYMENT_EDITION=DeploymentEdition.CLOUD,
        ENABLE_SOCIAL_OAUTH_LOGIN=True,
        CONSOLE_WEB_URL=CONSOLE_WEB_URL,
    )


def _install_service(monkeypatch: pytest.MonkeyPatch, service: FakeOAuthService) -> None:
    services = SimpleNamespace(accounts=SimpleNamespace(oauth=service))
    monkeypatch.setattr(oauth_controller, "application_services", lambda: services)


def test_login_parses_input_and_delegates_to_application_service(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    service = FakeOAuthService()
    _install_service(monkeypatch, service)

    with app.test_request_context(
        "/oauth/login/github?invite_token=invite&timezone=Asia%2FShanghai&language=zh-Hans&redirect_url=%2Fapps"
    ):
        response = OAuthLogin().get("github")

    assert response.status_code == 302
    assert response.headers["Location"] == "https://provider.example/authorize"
    assert service.authorization_calls == [
        (
            "github",
            OAuthAuthorizationRequest(
                invite_token="invite",
                timezone="Asia/Shanghai",
                language="zh-Hans",
                redirect_url="/apps",
            ),
        )
    ]


def test_login_returns_adapter_error_for_unknown_provider(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    service = FakeOAuthService(authorization_error=InvalidOAuthProviderError())
    _install_service(monkeypatch, service)

    with app.test_request_context("/oauth/login/unknown"):
        payload, status = OAuthLogin().get("unknown")

    assert status == 400
    assert payload == {"error": "Invalid provider"}


def test_oauth_admission_does_not_query_enterprise_features(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
    config_overrides: Callable[..., None],
) -> None:
    config_overrides(DEPLOYMENT_EDITION=DeploymentEdition.ENTERPRISE)
    monkeypatch.setattr(console_wraps, "_is_setup_completed", lambda: True)
    service = FakeOAuthService()
    _install_service(monkeypatch, service)

    def unexpected_feature_query() -> NoReturn:
        raise AssertionError("OAuth admission must not query Enterprise features")

    monkeypatch.setattr(SystemFeatureService, "get_license", unexpected_feature_query)

    with app.test_request_context("/oauth/login/github"):
        response = OAuthLogin().get("github")

    assert response.status_code == 302
    assert service.authorization_calls


def test_callback_passes_stable_values_and_serializes_session_cookies(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    service = FakeOAuthService()
    _install_service(monkeypatch, service)
    cookie_calls: list[tuple[str, str]] = []
    monkeypatch.setattr(oauth_controller, "extract_remote_ip", lambda _request: "203.0.113.10")
    monkeypatch.setattr(
        oauth_controller,
        "set_access_token_to_cookie",
        lambda _request, _response, token: cookie_calls.append(("access", token)),
    )
    monkeypatch.setattr(
        oauth_controller,
        "set_refresh_token_to_cookie",
        lambda _request, _response, token: cookie_calls.append(("refresh", token)),
    )
    monkeypatch.setattr(
        oauth_controller,
        "set_csrf_token_to_cookie",
        lambda _request, _response, token: cookie_calls.append(("csrf", token)),
    )
    state = encode_oauth_state(
        invite_token="invite",
        timezone="Asia/Shanghai",
        language="zh-Hans",
        redirect_url="/apps",
    )

    with app.test_request_context(
        f"/oauth/authorize/github?code=code-1&state={state}",
        headers={"Accept-Language": "en-US,en;q=0.9"},
    ):
        response = OAuthCallback().get("github")

    assert response.status_code == 302
    assert response.headers["Location"] == "/apps?oauth_new_user=false"
    assert service.callback_calls == [
        OAuthCallbackCommand(
            provider="github",
            code="code-1",
            invite_token="invite",
            timezone="Asia/Shanghai",
            language="zh-Hans",
            browser_language="en-US",
            ip_address="203.0.113.10",
        )
    ]
    assert cookie_calls == [
        ("access", "access-token"),
        ("refresh", "refresh-token"),
        ("csrf", "csrf-token"),
    ]


@pytest.mark.parametrize(
    ("redirect_url", "expected"),
    [
        ("https://console.example.com/apps", "https://console.example.com/apps?oauth_new_user=false"),
        ("https://console.example.com.malicious.example/apps", f"{CONSOLE_WEB_URL}?oauth_new_user=false"),
        ("//malicious.example.com/apps", f"{CONSOLE_WEB_URL}?oauth_new_user=false"),
        ("///malicious.example.com/apps", f"{CONSOLE_WEB_URL}?oauth_new_user=false"),
        (r"\\malicious.example.com/apps", f"{CONSOLE_WEB_URL}?oauth_new_user=false"),
    ],
)
def test_callback_serializes_safe_redirect_target(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
    redirect_url: str,
    expected: str,
) -> None:
    service = FakeOAuthService()
    _install_service(monkeypatch, service)
    state = encode_oauth_state(redirect_url=redirect_url)

    with app.test_request_context(f"/oauth/authorize/github?code=code-1&state={state}"):
        response = OAuthCallback().get("github")

    assert response.headers["Location"] == expected


def test_callback_serializes_invitation_completion_target(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    tokens = AccountSessionTokens("access-token", "refresh-token", "csrf-token")
    service = FakeOAuthService(callback_result=OAuthInvitationResult(tokens=tokens, invite_token="invite token"))
    _install_service(monkeypatch, service)

    with app.test_request_context("/oauth/authorize/github?code=code-1"):
        response = OAuthCallback().get("github")

    assert response.headers["Location"] == f"{CONSOLE_WEB_URL}/signin/invite-settings?invite_token=invite+token"


def test_callback_rejects_missing_code_before_service_call(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    service = FakeOAuthService()
    _install_service(monkeypatch, service)

    with app.test_request_context("/oauth/authorize/github"), pytest.raises(UnprocessableEntity):
        OAuthCallback().get("github")

    assert service.callback_calls == []


@pytest.mark.parametrize("error", [OAuthProviderRequestError(), OAuthIdentityLockUnavailableError()])
def test_callback_maps_oauth_processing_error_to_bad_request(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
    error: Exception,
) -> None:
    service = FakeOAuthService(callback_error=error)
    _install_service(monkeypatch, service)

    with app.test_request_context("/oauth/authorize/github?code=code-1"):
        payload, status = OAuthCallback().get("github")

    assert status == 400
    assert payload == {"error": "OAuth process failed"}


@pytest.mark.parametrize(
    ("error", "expected_query"),
    [
        (
            OAuthInvitationAccountMismatchError("invite-token"),
            "message=This+invitation+was+sent+to+another+account.+Please+sign+in+with+the+invited+account."
            "&invite_token=invite-token",
        ),
        (OAuthRegistrationError("Registration failed"), "message=Registration+failed"),
    ],
)
def test_callback_serializes_application_errors_as_signin_redirects(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
    error: Exception,
    expected_query: str,
) -> None:
    service = FakeOAuthService(callback_error=error)
    _install_service(monkeypatch, service)

    with app.test_request_context("/oauth/authorize/github?code=code-1"):
        response = OAuthCallback().get("github")

    assert response.status_code == 302
    assert response.headers["Location"] == f"{CONSOLE_WEB_URL}/signin?{expected_query}"


def test_oauth_admission_rejects_disabled_social_login(
    app: Flask,
    monkeypatch: pytest.MonkeyPatch,
    config_overrides: Callable[..., None],
) -> None:
    service = FakeOAuthService()
    _install_service(monkeypatch, service)
    config_overrides(ENABLE_SOCIAL_OAUTH_LOGIN=False)

    with app.test_request_context("/oauth/login/github"), pytest.raises(Forbidden):
        OAuthLogin().get("github")

    assert service.authorization_calls == []