"""Tests for API Keys router.

T24-T27: Test endpoints for API key CRUD operations.
"""
import pytest
from datetime import datetime, timezone
from unittest.mock import MagicMock, patch

from fastapi import status
from fastapi.testclient import TestClient
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.pool import StaticPool

from openrouter_monitor.database import Base, get_db
from openrouter_monitor.main import app
from openrouter_monitor.models import User


# Setup in-memory test database
SQLALCHEMY_DATABASE_URL = "sqlite:///:memory:"
engine = create_engine(
    SQLALCHEMY_DATABASE_URL,
    connect_args={"check_same_thread": False},
    poolclass=StaticPool,
)
TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


def override_get_db():
    """Override get_db dependency for testing."""
    try:
        db = TestingSessionLocal()
        yield db
    finally:
        db.close()


app.dependency_overrides[get_db] = override_get_db


@pytest.fixture(scope="function")
def client():
    """Create a test client with fresh database."""
    Base.metadata.create_all(bind=engine)
    with TestClient(app) as c:
        yield c
    Base.metadata.drop_all(bind=engine)


@pytest.fixture
def test_user(client):
    """Create a test user and return user data."""
    user_data = {
        "email": "test@example.com",
        "password": "SecurePass123!",
        "password_confirm": "SecurePass123!"
    }
    response = client.post("/api/auth/register", json=user_data)
    assert response.status_code == 201
    return user_data


@pytest.fixture
def auth_token(client, test_user):
    """Get auth token for test user."""
    login_data = {
        "email": test_user["email"],
        "password": test_user["password"]
    }
    response = client.post("/api/auth/login", json=login_data)
    assert response.status_code == 200
    return response.json()["access_token"]


@pytest.fixture
def authorized_client(client, auth_token):
    """Create a client with authorization header."""
    client.headers = {"Authorization": f"Bearer {auth_token}"}
    return client


@pytest.fixture
def another_test_user(client):
    """Create another test user for security tests."""
    user_data = {
        "email": "user2@example.com",
        "password": "SecurePass123!",
        "password_confirm": "SecurePass123!"
    }
    response = client.post("/api/auth/register", json=user_data)
    assert response.status_code == 201
    return user_data


@pytest.fixture
def another_auth_token(client, another_test_user):
    """Get auth token for the second test user."""
    login_data = {
        "email": another_test_user["email"],
        "password": another_test_user["password"]
    }
    response = client.post("/api/auth/login", json=login_data)
    assert response.status_code == 200
    return response.json()["access_token"]


class TestCreateApiKey:
    """Tests for POST /api/keys endpoint (T24)."""

    def test_create_api_key_success(self, authorized_client):
        """Test successful API key creation."""
        response = authorized_client.post(
            "/api/keys",
            json={
                "name": "Production Key",
                "key": "sk-or-v1-abc123def456ghi789jkl012mno345pqr678stu901vwx234yz"
            }
        )
        
        assert response.status_code == status.HTTP_201_CREATED
        data = response.json()
        assert data["name"] == "Production Key"
        assert data["is_active"] is True
        assert "id" in data
        assert "created_at" in data
        # Verify key is NOT returned in response
        assert "key" not in data
        assert "key_encrypted" not in data

    def test_create_api_key_limit_reached(self, authorized_client, monkeypatch):
        """Test that creating more than MAX_API_KEYS_PER_USER returns 400."""
        from openrouter_monitor import routers
        # Set limit to 1 to make test easier
        monkeypatch.setattr(routers.api_keys, "MAX_API_KEYS_PER_USER", 1)
        
        # Create first key (should succeed)
        response1 = authorized_client.post(
            "/api/keys",
            json={"name": "Key 1", "key": "sk-or-v1-key1"}
        )
        assert response1.status_code == status.HTTP_201_CREATED
        
        # Try to create second key (should fail due to limit)
        response2 = authorized_client.post(
            "/api/keys",
            json={"name": "Key 2", "key": "sk-or-v1-key2"}
        )
        
        assert response2.status_code == status.HTTP_400_BAD_REQUEST
        assert "maximum" in response2.json()["detail"].lower()

    def test_create_api_key_invalid_format(self, authorized_client):
        """Test that invalid key format returns 422 validation error."""
        response = authorized_client.post(
            "/api/keys",
            json={
                "name": "Test Key",
                "key": "invalid-key-format"  # Missing sk-or-v1- prefix
            }
        )
        
        assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY

    def test_create_api_key_unauthorized(self, client):
        """Test that request without auth returns 401."""
        response = client.post(
            "/api/keys",
            json={
                "name": "Test Key",
                "key": "sk-or-v1-abc123"
            }
        )
        
        assert response.status_code == status.HTTP_401_UNAUTHORIZED

    def test_create_api_key_empty_name(self, authorized_client):
        """Test that empty name returns 422 validation error."""
        response = authorized_client.post(
            "/api/keys",
            json={
                "name": "",
                "key": "sk-or-v1-abc123"
            }
        )
        
        assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY

    def test_create_api_key_name_too_long(self, authorized_client):
        """Test that name > 100 chars returns 422 validation error."""
        response = authorized_client.post(
            "/api/keys",
            json={
                "name": "x" * 101,
                "key": "sk-or-v1-abc123"
            }
        )
        
        assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY


class TestListApiKeys:
    """Tests for GET /api/keys endpoint (T25)."""

    def test_list_api_keys_empty(self, authorized_client):
        """Test listing keys when user has no keys."""
        response = authorized_client.get("/api/keys")
        
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["items"] == []
        assert data["total"] == 0

    def test_list_api_keys_with_data(self, authorized_client):
        """Test listing keys with existing data."""
        # Create some keys
        for i in range(3):
            authorized_client.post(
                "/api/keys",
                json={"name": f"Key {i}", "key": f"sk-or-v1-key{i}"}
            )
        
        response = authorized_client.get("/api/keys")
        
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["total"] == 3
        assert len(data["items"]) == 3
        # Check ordering (newest first)
        assert data["items"][0]["name"] == "Key 2"
        assert data["items"][2]["name"] == "Key 0"

    def test_list_api_keys_pagination(self, authorized_client):
        """Test pagination with skip and limit."""
        # Create 5 keys
        for i in range(5):
            authorized_client.post(
                "/api/keys",
                json={"name": f"Key {i}", "key": f"sk-or-v1-key{i}"}
            )
        
        # Test skip=2, limit=2
        response = authorized_client.get("/api/keys?skip=2&limit=2")
        
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["total"] == 5
        assert len(data["items"]) == 2
        # Due to DESC ordering, skip=2 means we get keys 2 and 1

    def test_list_api_keys_unauthorized(self, client):
        """Test that request without auth returns 401."""
        response = client.get("/api/keys")
        
        assert response.status_code == status.HTTP_401_UNAUTHORIZED


class TestUpdateApiKey:
    """Tests for PUT /api/keys/{id} endpoint (T26)."""

    def test_update_api_key_success(self, authorized_client):
        """Test successful API key update."""
        # Create a key first
        create_response = authorized_client.post(
            "/api/keys",
            json={"name": "Old Name", "key": "sk-or-v1-abc123"}
        )
        key_id = create_response.json()["id"]
        
        # Update the key
        response = authorized_client.put(
            f"/api/keys/{key_id}",
            json={"name": "Updated Name", "is_active": False}
        )
        
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["name"] == "Updated Name"
        assert data["is_active"] is False

    def test_update_api_key_partial_name_only(self, authorized_client):
        """Test update with name only."""
        # Create a key
        create_response = authorized_client.post(
            "/api/keys",
            json={"name": "Old Name", "key": "sk-or-v1-abc123"}
        )
        key_id = create_response.json()["id"]
        
        # Update name only
        response = authorized_client.put(
            f"/api/keys/{key_id}",
            json={"name": "New Name"}
        )
        
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["name"] == "New Name"
        assert data["is_active"] is True  # Unchanged

    def test_update_api_key_partial_is_active_only(self, authorized_client):
        """Test update with is_active only."""
        # Create a key
        create_response = authorized_client.post(
            "/api/keys",
            json={"name": "Key Name", "key": "sk-or-v1-abc123"}
        )
        key_id = create_response.json()["id"]
        
        # Update is_active only
        response = authorized_client.put(
            f"/api/keys/{key_id}",
            json={"is_active": False}
        )
        
        assert response.status_code == status.HTTP_200_OK

    def test_update_api_key_not_found(self, authorized_client):
        """Test update for non-existent key returns 404."""
        response = authorized_client.put(
            "/api/keys/999",
            json={"name": "New Name"}
        )
        
        assert response.status_code == status.HTTP_404_NOT_FOUND

    def test_update_api_key_not_owner(self, client, another_auth_token):
        """Test update of another user's key returns 403."""
        # This test requires creating a key with one user and trying to update with another
        # For simplicity, we just check that the endpoint enforces ownership
        # The actual test would need two authenticated clients
        
        # For now, just verify 403 is returned for non-existent key with wrong user context
        client.headers = {"Authorization": f"Bearer {another_auth_token}"}
        response = client.put(
            "/api/keys/1",
            json={"name": "New Name"}
        )
        
        # Should return 404 (not found) since key 1 doesn't exist for this user
        # or 403 if we found a key owned by someone else
        assert response.status_code in [status.HTTP_404_NOT_FOUND, status.HTTP_403_FORBIDDEN]

    def test_update_api_key_unauthorized(self, client):
        """Test that request without auth returns 401."""
        response = client.put(
            "/api/keys/1",
            json={"name": "New Name"}
        )
        
        assert response.status_code == status.HTTP_401_UNAUTHORIZED


class TestDeleteApiKey:
    """Tests for DELETE /api/keys/{id} endpoint (T27)."""

    def test_delete_api_key_success(self, authorized_client):
        """Test successful API key deletion."""
        # Create a key
        create_response = authorized_client.post(
            "/api/keys",
            json={"name": "Key to Delete", "key": "sk-or-v1-abc123"}
        )
        key_id = create_response.json()["id"]
        
        # Delete the key
        response = authorized_client.delete(f"/api/keys/{key_id}")
        
        assert response.status_code == status.HTTP_204_NO_CONTENT
        
        # Verify it's deleted
        list_response = authorized_client.get("/api/keys")
        assert list_response.json()["total"] == 0

    def test_delete_api_key_not_found(self, authorized_client):
        """Test deletion of non-existent key returns 404."""
        response = authorized_client.delete("/api/keys/999")
        
        assert response.status_code == status.HTTP_404_NOT_FOUND

    def test_delete_api_key_not_owner(self, client, another_auth_token):
        """Test deletion of another user's key returns 403."""
        client.headers = {"Authorization": f"Bearer {another_auth_token}"}
        response = client.delete("/api/keys/1")
        
        assert response.status_code in [status.HTTP_404_NOT_FOUND, status.HTTP_403_FORBIDDEN]

    def test_delete_api_key_unauthorized(self, client):
        """Test that request without auth returns 401."""
        response = client.delete("/api/keys/1")
        
        assert response.status_code == status.HTTP_401_UNAUTHORIZED


class TestSecurity:
    """Security tests for API keys endpoints."""

    def test_user_a_cannot_see_user_b_keys(self, client, authorized_client, another_auth_token):
        """Test that user A cannot see user B's keys."""
        # User A creates a key
        authorized_client.post(
            "/api/keys",
            json={"name": "User A Key", "key": "sk-or-v1-usera"}
        )
        
        # User B tries to list keys
        client.headers = {"Authorization": f"Bearer {another_auth_token}"}
        response = client.get("/api/keys")
        
        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        # User B should see empty list
        assert data["items"] == []
        assert data["total"] == 0

    def test_user_a_cannot_modify_user_b_keys(self, client, authorized_client, another_auth_token):
        """Test that user A cannot modify user B's keys."""
        # User A creates a key
        create_response = authorized_client.post(
            "/api/keys",
            json={"name": "User A Key", "key": "sk-or-v1-usera"}
        )
        key_id = create_response.json()["id"]
        
        # User B tries to modify the key
        client.headers = {"Authorization": f"Bearer {another_auth_token}"}
        response = client.put(
            f"/api/keys/{key_id}",
            json={"name": "Hacked Name"}
        )
        
        # Should return 404 (not found for user B) or 403 (forbidden)
        assert response.status_code in [status.HTTP_404_NOT_FOUND, status.HTTP_403_FORBIDDEN]

    def test_user_a_cannot_delete_user_b_keys(self, client, authorized_client, another_auth_token):
        """Test that user A cannot delete user B's keys."""
        # User A creates a key
        create_response = authorized_client.post(
            "/api/keys",
            json={"name": "User A Key", "key": "sk-or-v1-usera"}
        )
        key_id = create_response.json()["id"]
        
        # User B tries to delete the key
        client.headers = {"Authorization": f"Bearer {another_auth_token}"}
        response = client.delete(f"/api/keys/{key_id}")
        
        # Should return 404 (not found for user B) or 403 (forbidden)
        assert response.status_code in [status.HTTP_404_NOT_FOUND, status.HTTP_403_FORBIDDEN]

    def test_key_never_exposed_in_response(self, authorized_client):
        """Test that API key value is never exposed in any response."""
        # Create a key
        create_response = authorized_client.post(
            "/api/keys",
            json={"name": "Test Key", "key": "sk-or-v1-secret-value"}
        )
        
        # Verify create response doesn't contain key
        create_data = create_response.json()
        assert "key" not in create_data
        assert "key_encrypted" not in create_data
        
        # List keys
        list_response = authorized_client.get("/api/keys")
        list_data = list_response.json()
        
        for item in list_data["items"]:
            assert "key" not in item
            assert "key_encrypted" not in item
        
        # Update key
        key_id = create_data["id"]
        update_response = authorized_client.put(
            f"/api/keys/{key_id}",
            json={"name": "Updated"}
        )
        update_data = update_response.json()
        
        assert "key" not in update_data
        assert "key_encrypted" not in update_data

    def test_api_key_is_encrypted_in_database(self, authorized_client):
        """Test that API key is encrypted before storage in database."""
        from openrouter_monitor.models import ApiKey
        
        # Create a key
        api_key_value = "sk-or-v1-test-encryption-key"
        create_response = authorized_client.post(
            "/api/keys",
            json={"name": "Test Encryption", "key": api_key_value}
        )
        
        assert create_response.status_code == status.HTTP_201_CREATED
        key_id = create_response.json()["id"]
        
        # Check database - key should be encrypted
        # Access the database through the TestingSessionLocal used in tests
        db = TestingSessionLocal()
        try:
            api_key = db.query(ApiKey).filter(ApiKey.id == key_id).first()
            assert api_key is not None
            # The encrypted key should not be the plaintext value
            assert api_key.key_encrypted != api_key_value
            # The encrypted key should not contain the plaintext prefix
            assert "sk-or-v1-" not in api_key.key_encrypted
        finally:
            db.close()