from __future__ import annotations

from typing import Callable
from uuid import UUID

import pytest
from fastapi import HTTPException
from fastapi.testclient import TestClient

from app import app
from core.auth.models import CurrentUser
from v1.auth.dependencies import get_auth_service
from v1.profile.dependencies import get_current_user
from v1.auth.rate_limit import reset_rate_limit_state
from v1.auth.schemas import (
    AuthResendCodeResponse,
    AuthSignupStartResponse,
    AuthTokenResponse,
    AuthUserByEmailResponse,
    AuthUser,
    LoginRequest,
    RefreshRequest,
    SignupResendRequest,
    SignupStartRequest,
    SignupVerifyRequest,
)
from v1.auth.service import AuthService


@pytest.fixture(autouse=True)
def reset_auth_rate_limit_state() -> None:
    reset_rate_limit_state()


class FakeAuthService(AuthService):
    def __init__(self, token_response: AuthTokenResponse) -> None:
        self._token_response = token_response

    async def signup_start(
        self, request: SignupStartRequest
    ) -> AuthSignupStartResponse:
        if request.email == "exists@example.com":
            raise HTTPException(status_code=422, detail="Invalid signup request")
        return AuthSignupStartResponse(email=request.email)

    async def signup_verify(self, request: SignupVerifyRequest) -> AuthTokenResponse:
        if request.token == "000000":
            raise HTTPException(status_code=401, detail="Invalid verification code")
        return self._token_response

    async def signup_resend(
        self, request: SignupResendRequest
    ) -> AuthResendCodeResponse:
        return AuthResendCodeResponse()

    async def login(self, request: LoginRequest) -> AuthTokenResponse:
        raise HTTPException(status_code=401, detail="Invalid credentials")

    async def refresh(self, request: RefreshRequest) -> AuthTokenResponse:
        raise HTTPException(status_code=401, detail="Invalid refresh token")

    async def logout(self, refresh_token: str | None) -> None:
        return None

    async def get_user_by_email(self, email: str) -> AuthUserByEmailResponse:
        if email == "missing@example.com":
            raise HTTPException(status_code=404, detail="User not found")
        return AuthUserByEmailResponse(
            id="user-1",
            email=email,
            created_at="2026-02-24T00:00:00Z",
            email_confirmed_at=None,
        )


def _override_auth_service(service: AuthService) -> Callable[[], AuthService]:
    def _get_service() -> AuthService:
        return service

    return _get_service


def test_signup_start_returns_pending_response() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post(
            "/api/v1/auth/signup/start",
            json={
                "username": "demo",
                "email": "user@example.com",
                "password": "secret123",
            },
        )
        assert response.status_code == 202
        body = response.json()
        assert body["status"] == "pending_verification"
        assert body["email"] == "user@example.com"
    finally:
        app.dependency_overrides = {}


def test_signup_verify_returns_token_response() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post(
            "/api/v1/auth/signup/verify",
            json={"email": "user@example.com", "token": "123456"},
        )
        assert response.status_code == 200
        body = response.json()
        assert body["access_token"] == "access"
        assert body["refresh_token"] == "refresh"
        assert body["user"]["email"] == "user@example.com"
    finally:
        app.dependency_overrides = {}


def test_signup_resend_returns_generic_message() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post(
            "/api/v1/auth/signup/resend",
            json={"email": "user@example.com"},
        )
        assert response.status_code == 200
        body = response.json()
        assert (
            body["message"] == "If the email exists, a verification code has been sent"
        )
    finally:
        app.dependency_overrides = {}


def test_signup_verify_invalid_token_returns_problem_details() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post(
            "/api/v1/auth/signup/verify",
            json={"email": "user@example.com", "token": "000000"},
        )
        assert response.status_code == 401
        assert response.headers["content-type"].startswith("application/problem+json")
        body = response.json()
        assert body["title"] == "Unauthorized"
        assert body["status"] == 401
        assert body["detail"] == "Invalid verification code"
    finally:
        app.dependency_overrides = {}


def test_signup_start_existing_email_returns_problem_details() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post(
            "/api/v1/auth/signup/start",
            json={
                "username": "demo",
                "email": "exists@example.com",
                "password": "secret123",
            },
        )
        assert response.status_code == 422
        assert response.headers["content-type"].startswith("application/problem+json")
        body = response.json()
        assert body["title"] == "Unprocessable Content"
        assert body["status"] == 422
        assert body["detail"] == "Invalid signup request"
    finally:
        app.dependency_overrides = {}


def test_signup_verify_rate_limited_after_too_many_attempts() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        for _ in range(10):
            ok = client.post(
                "/api/v1/auth/signup/verify",
                json={"email": "user@example.com", "token": "123456"},
            )
            assert ok.status_code == 200

        blocked = client.post(
            "/api/v1/auth/signup/verify",
            json={"email": "user@example.com", "token": "123456"},
        )
        assert blocked.status_code == 429
        assert blocked.headers["content-type"].startswith("application/problem+json")
    finally:
        app.dependency_overrides = {}


def test_signup_resend_rate_limited_after_too_many_attempts() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        for _ in range(3):
            ok = client.post(
                "/api/v1/auth/signup/resend",
                json={"email": "user@example.com"},
            )
            assert ok.status_code == 200

        blocked = client.post(
            "/api/v1/auth/signup/resend",
            json={"email": "user@example.com"},
        )
        assert blocked.status_code == 429
        assert blocked.headers["content-type"].startswith("application/problem+json")
    finally:
        app.dependency_overrides = {}


def test_signup_start_rate_limited_after_too_many_attempts() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        for _ in range(5):
            ok = client.post(
                "/api/v1/auth/signup/start",
                json={
                    "username": "demo",
                    "email": "user@example.com",
                    "password": "secret123",
                },
            )
            assert ok.status_code == 202

        blocked = client.post(
            "/api/v1/auth/signup/start",
            json={
                "username": "demo",
                "email": "user@example.com",
                "password": "secret123",
            },
        )
        assert blocked.status_code == 429
        assert blocked.headers["content-type"].startswith("application/problem+json")
    finally:
        app.dependency_overrides = {}


def test_login_invalid_returns_problem_details() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post(
            "/api/v1/auth/login",
            json={"email": "user@example.com", "password": "wrongpw"},
        )
        assert response.status_code == 401
        assert response.headers["content-type"].startswith("application/problem+json")
        body = response.json()
        assert body["title"] == "Unauthorized"
        assert body["status"] == 401
        assert body["detail"] == "Invalid credentials"
    finally:
        app.dependency_overrides = {}


def test_refresh_invalid_returns_problem_details() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post(
            "/api/v1/auth/refresh",
            json={"refresh_token": "invalid"},
        )
        assert response.status_code == 401
        assert response.headers["content-type"].startswith("application/problem+json")
        body = response.json()
        assert body["title"] == "Unauthorized"
        assert body["status"] == 401
        assert body["detail"] == "Invalid refresh token"
    finally:
        app.dependency_overrides = {}


def test_logout_returns_no_content() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post(
            "/api/v1/auth/logout",
            json={"refresh_token": "refresh"},
        )
        assert response.status_code == 204
        assert response.content == b""
    finally:
        app.dependency_overrides = {}


def test_signup_start_validation_error_returns_problem_details() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post("/api/v1/auth/signup/start", json={})
        assert response.status_code == 422
        assert response.headers["content-type"].startswith("application/problem+json")
        body = response.json()
        assert body["title"] == "Unprocessable Content"
        assert body["status"] == 422
        assert body["detail"] == "Invalid request"
    finally:
        app.dependency_overrides = {}


def test_signup_start_missing_username_returns_problem_details() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )

    client = TestClient(app)
    try:
        response = client.post(
            "/api/v1/auth/signup/start",
            json={"email": "user@example.com", "password": "secret123"},
        )
        assert response.status_code == 422
        assert response.headers["content-type"].startswith("application/problem+json")
        body = response.json()
        assert body["title"] == "Unprocessable Content"
        assert body["status"] == 422
        assert body["detail"] == "Invalid request"
    finally:
        app.dependency_overrides = {}


def test_get_user_by_email_returns_user() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )
    app.dependency_overrides[get_current_user] = lambda: CurrentUser(
        id=UUID("00000000-0000-0000-0000-000000000001"),
        email="user@example.com",
    )

    client = TestClient(app)
    try:
        response = client.get(
            "/api/v1/auth/users/by-email",
            params={"email": "user@example.com"},
        )
        assert response.status_code == 200
        body = response.json()
        assert body["email"] == "user@example.com"
        assert body["id"] == "user-1"
    finally:
        app.dependency_overrides = {}


def test_get_user_by_email_not_found_returns_problem_details() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )
    app.dependency_overrides[get_current_user] = lambda: CurrentUser(
        id=UUID("00000000-0000-0000-0000-000000000001"),
        email="missing@example.com",
    )

    client = TestClient(app)
    try:
        response = client.get(
            "/api/v1/auth/users/by-email",
            params={"email": "missing@example.com"},
        )
        assert response.status_code == 404
        assert response.headers["content-type"].startswith("application/problem+json")
        body = response.json()
        assert body["title"] == "Not Found"
        assert body["status"] == 404
        assert body["detail"] == "User not found"
    finally:
        app.dependency_overrides = {}


def test_get_user_by_email_forbidden_when_querying_other_user() -> None:
    user = AuthUser(id="user-1", email="user@example.com")
    token_response = AuthTokenResponse(
        access_token="access",
        refresh_token="refresh",
        expires_in=3600,
        token_type="bearer",
        user=user,
    )
    app.dependency_overrides[get_auth_service] = _override_auth_service(
        FakeAuthService(token_response)
    )
    app.dependency_overrides[get_current_user] = lambda: CurrentUser(
        id=UUID("00000000-0000-0000-0000-000000000001"),
        email="self@example.com",
    )

    client = TestClient(app)
    try:
        response = client.get(
            "/api/v1/auth/users/by-email",
            params={"email": "target@example.com"},
        )
        assert response.status_code == 403
        assert response.headers["content-type"].startswith("application/problem+json")
        body = response.json()
        assert body["title"] == "Forbidden"
        assert body["status"] == 403
        assert body["detail"] == "Forbidden"
    finally:
        app.dependency_overrides = {}