"""Аутентификация: методы по окружению, dev-вход, Telegram (проверка подписи)."""
from __future__ import annotations

import hashlib
import hmac
import time

from fastapi.testclient import TestClient

from tests.conftest import csrf_headers


def test_auth_config_dev_has_all_methods(client: TestClient):
    cfg = client.get("/api/auth/config").json()
    assert "password" in cfg["methods"]
    assert "telegram" in cfg["methods"]
    assert "stub" in cfg["methods"]  # dev → доступен вход по нику


def test_enabled_methods_by_env(monkeypatch):
    from app.auth.registry import enabled_methods
    from app.core.config import settings

    monkeypatch.setattr(settings, "app_env", "development")
    assert set(enabled_methods()) == {"password", "telegram", "stub"}
    monkeypatch.setattr(settings, "app_env", "test")
    assert enabled_methods() == ["password", "telegram"]  # test (прод-клон) → без stub
    monkeypatch.setattr(settings, "app_env", "production")
    assert enabled_methods() == ["password", "telegram"]  # prod → без stub


def test_env_flags_and_db_path(monkeypatch):
    """dev → файл дева; test и prod → том /data (общая ветвь is_development)."""
    from app.core.config import settings

    monkeypatch.setattr(settings, "dev_database_url", "sqlite:///dev.db")
    monkeypatch.setattr(settings, "prod_database_url", "sqlite:////data/prod.db")

    monkeypatch.setattr(settings, "app_env", "development")
    assert settings.is_development and settings.database_url == "sqlite:///dev.db"
    monkeypatch.setattr(settings, "app_env", "test")
    assert settings.is_test and settings.database_url == "sqlite:////data/prod.db"
    monkeypatch.setattr(settings, "app_env", "production")
    assert settings.is_production and settings.database_url == "sqlite:////data/prod.db"


def test_dev_login_works(client: TestClient):
    r = client.post("/api/auth/dev/login", json={"nickname": "Тестер"})
    assert r.status_code == 200, r.text
    assert r.json()["nickname"] == "Тестер"


def _telegram_payload(token: str, **fields) -> dict:
    data = {"id": 777, "first_name": "Иван", "username": "ivan_tg", "auth_date": int(time.time())}
    data.update(fields)
    secret = hashlib.sha256(token.encode()).digest()
    check = "\n".join(f"{k}={data[k]}" for k in sorted(data))
    sig = hmac.new(secret, check.encode(), hashlib.sha256).hexdigest()
    return {**data, "hash": sig}


def test_dev_login_into_telegram_user_no_duplicate(client: TestClient, engine, monkeypatch):
    """Dev-вход по нику Telegram-аккаунта входит в него, а не создаёт дубль «ник 2»."""
    from sqlmodel import Session, select

    from app.core.config import settings
    from app.models import User

    monkeypatch.setattr(settings, "telegram_bot_token", "TEST_BOT_TOKEN")
    r = client.post("/api/auth/telegram", json=_telegram_payload("TEST_BOT_TOKEN"))
    assert r.status_code == 200, r.text
    tg_id, nick = r.json()["id"], r.json()["nickname"]

    client.cookies.clear()  # «другой вход» — без сессии
    r2 = client.post("/api/auth/dev/login", json={"nickname": nick})
    assert r2.status_code == 200, r2.text
    assert r2.json()["id"] == tg_id  # тот же аккаунт, не новый

    with Session(engine) as s:
        users = s.exec(select(User).where(User.nickname == nick)).all()
        assert len(users) == 1  # дубликат не создан


def test_dev_login_after_rename_no_duplicate(client: TestClient, engine):
    """После смены ника dev-вход по новому нику входит в того же игрока (без дубля)."""
    from sqlmodel import Session, select

    from app.models import User

    uid = client.post("/api/auth/dev/login", json={"nickname": "Старый"}).json()["id"]
    pr = client.patch("/api/users/me", json={"nickname": "Новый"}, headers=csrf_headers(client))
    assert pr.status_code == 200, pr.text

    client.cookies.clear()
    r2 = client.post("/api/auth/dev/login", json={"nickname": "Новый"})
    assert r2.status_code == 200, r2.text
    assert r2.json()["id"] == uid

    with Session(engine) as s:
        assert len(s.exec(select(User).where(User.nickname == "Новый")).all()) == 1


def test_telegram_login_valid_signature(client: TestClient, monkeypatch):
    from app.core.config import settings

    monkeypatch.setattr(settings, "telegram_bot_token", "TEST_BOT_TOKEN")
    payload = _telegram_payload("TEST_BOT_TOKEN")
    r = client.post("/api/auth/telegram", json=payload)
    assert r.status_code == 200, r.text
    me = r.json()
    assert me["nickname"]  # пользователь создан
    assert me["telegram_id"] == 777


def test_telegram_login_bad_signature_rejected(client: TestClient, monkeypatch):
    from app.core.config import settings

    monkeypatch.setattr(settings, "telegram_bot_token", "TEST_BOT_TOKEN")
    payload = _telegram_payload("TEST_BOT_TOKEN")
    payload["hash"] = "deadbeef"  # подделка
    r = client.post("/api/auth/telegram", json=payload)
    assert r.status_code == 401
    _ = csrf_headers  # (для единообразия импорта)


def test_telegram_same_id_no_duplicate_account(client: TestClient, monkeypatch):
    """Вход с двух устройств / после смены тега — один аккаунт (ключ = числовой id)."""
    from app.core.config import settings

    monkeypatch.setattr(settings, "telegram_bot_token", "TEST_BOT_TOKEN")
    r1 = client.post("/api/auth/telegram", json=_telegram_payload("TEST_BOT_TOKEN", username="firsttag"))
    assert r1.status_code == 200, r1.text

    client.cookies.clear()  # «другое устройство» — без сессии
    # Тот же telegram id (777), но другой тег и свежий auth_date.
    r2 = client.post("/api/auth/telegram", json=_telegram_payload("TEST_BOT_TOKEN", username="changedtag"))
    assert r2.status_code == 200, r2.text
    assert r2.json()["id"] == r1.json()["id"]            # тот же пользователь
    assert r2.json()["nickname"] == r1.json()["nickname"]  # ник не пересоздаётся


def test_telegram_register_nickname_collision_then_pick(client: TestClient, engine, monkeypatch):
    """Первый вход через ТГ, тег совпал с чужим ником → просим выбрать ник → регистрируем."""
    from sqlmodel import Session

    from app.core.config import settings
    from app.models import User

    monkeypatch.setattr(settings, "telegram_bot_token", "TEST_BOT_TOKEN")
    with Session(engine) as s:  # существующий игрок с ником = тегу из payload (ivan_tg)
        s.add(User(nickname="ivan_tg", role="player", auth_provider="stub"))
        s.commit()

    payload = _telegram_payload("TEST_BOT_TOKEN")  # id=777, username=ivan_tg
    r = client.post("/api/auth/telegram", json=payload)
    assert r.status_code == 409, r.text
    err = r.json()["error"]
    assert err["code"] == "TELEGRAM_NICKNAME_REQUIRED"
    assert err["details"]["suggested"] == "ivan_tg"

    # Повтор с выбранным свободным ником (та же подпись виджета).
    r2 = client.post("/api/auth/telegram/register", json={**payload, "nickname": "Иван-новый"})
    assert r2.status_code == 200, r2.text
    assert r2.json()["nickname"] == "Иван-новый"
    assert r2.json()["telegram_id"] == 777


def test_telegram_register_rejects_taken_nickname(client: TestClient, engine, monkeypatch):
    """На шаге выбора ника всё ещё занятый ник отклоняется (NICKNAME_TAKEN)."""
    from sqlmodel import Session

    from app.core.config import settings
    from app.models import User

    monkeypatch.setattr(settings, "telegram_bot_token", "TEST_BOT_TOKEN")
    with Session(engine) as s:
        s.add(User(nickname="ivan_tg", role="player", auth_provider="stub"))
        s.add(User(nickname="занятый", role="player", auth_provider="stub"))
        s.commit()

    payload = _telegram_payload("TEST_BOT_TOKEN")
    r = client.post("/api/auth/telegram/register", json={**payload, "nickname": "занятый"})
    assert r.status_code == 409, r.text
    assert r.json()["error"]["code"] == "NICKNAME_TAKEN"