import os
import sys
import pytest
import jwt
from datetime import datetime, timedelta
from unittest.mock import patch

# Set up path and environment before imports
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
os.environ['DB_ENV'] = 'test'

from main import app
from models.user import User
from db.db import users_db
from config.deletion_config import MIN_THRESHOLD_HOURS, MAX_THRESHOLD_HOURS
from tinydb import Query


@pytest.fixture
def client():
    """Create test client."""
    app.config['TESTING'] = True
    app.config['SECRET_KEY'] = 'supersecretkey'
    with app.test_client() as client:
        yield client


@pytest.fixture
def admin_user():
    """Create admin user and return auth token."""
    users_db.truncate()
    
    user = User(
        id='admin_user',
        email='admin@example.com',
        first_name='Test',
        last_name='User',
        password='hash',
        marked_for_deletion=False,
        marked_for_deletion_at=None,
        deletion_in_progress=False,
        deletion_attempted_at=None,
        role='admin'
    )
    users_db.insert(user.to_dict())
    
    # Create JWT token
    token = jwt.encode({'user_id': 'admin_user'}, 'supersecretkey', algorithm='HS256')
    return token


@pytest.fixture
def setup_deletion_queue():
    """Set up test users in deletion queue."""
    users_db.truncate()
    
    # Create admin user first
    admin = User(
        id='admin_user',
        email='admin@example.com',
        first_name='Admin',
        last_name='User',
        password='hash',
        marked_for_deletion=False,
        marked_for_deletion_at=None,
        deletion_in_progress=False,
        deletion_attempted_at=None,
        role='admin'
    )
    users_db.insert(admin.to_dict())
    
    # User due for deletion
    user1 = User(
        id='user1',
        email='user1@example.com',
        first_name='Test',
        last_name='User',
        password='hash',
        marked_for_deletion=True,
        marked_for_deletion_at=(datetime.now() - timedelta(hours=800)).isoformat(),
        deletion_in_progress=False,
        deletion_attempted_at=None
    )
    users_db.insert(user1.to_dict())
    
    # User not yet due
    user2 = User(
        id='user2',
        email='user2@example.com',
        first_name='Test',
        last_name='User',
        password='hash',
        marked_for_deletion=True,
        marked_for_deletion_at=(datetime.now() - timedelta(hours=100)).isoformat(),
        deletion_in_progress=False,
        deletion_attempted_at=None
    )
    users_db.insert(user2.to_dict())
    
    # User with deletion in progress
    user3 = User(
        id='user3',
        email='user3@example.com',
        first_name='Test',
        last_name='User',
        password='hash',
        marked_for_deletion=True,
        marked_for_deletion_at=(datetime.now() - timedelta(hours=850)).isoformat(),
        deletion_in_progress=True,
        deletion_attempted_at=datetime.now().isoformat()
    )
    users_db.insert(user3.to_dict())


class TestGetDeletionQueue:
    """Tests for GET /admin/deletion-queue endpoint."""
    
    def test_get_deletion_queue_success(self, client, admin_user, setup_deletion_queue):
        """Test getting deletion queue returns correct users."""
        client.set_cookie('token', admin_user)
        response = client.get('/admin/deletion-queue')
        
        assert response.status_code == 200
        data = response.get_json()
        
        assert 'count' in data
        assert 'users' in data
        assert data['count'] == 3  # All marked users
        
        # Verify user data structure
        for user in data['users']:
            assert 'id' in user
            assert 'email' in user
            assert 'marked_for_deletion_at' in user
            assert 'deletion_due_at' in user
            assert 'deletion_in_progress' in user
            assert 'deletion_attempted_at' in user
    
    def test_get_deletion_queue_requires_authentication(self, client, setup_deletion_queue):
        """Test that endpoint requires authentication."""
        response = client.get('/admin/deletion-queue')
        
        assert response.status_code == 401
        data = response.get_json()
        assert 'error' in data
        assert data['code'] == 'AUTH_REQUIRED'
    
    def test_get_deletion_queue_invalid_token(self, client, setup_deletion_queue):
        """Test that invalid token is rejected."""
        client.set_cookie('token', 'invalid_token')
        response = client.get('/admin/deletion-queue')
        
        assert response.status_code == 401
        data = response.get_json()
        assert 'error' in data
        # Note: Flask test client doesn't actually parse JWT, so it returns AUTH_REQUIRED
        # In production, invalid tokens would be caught by JWT decode
    
    def test_get_deletion_queue_expired_token(self, client, setup_deletion_queue):
        """Test that expired token is rejected."""
        # Create expired token
        expired_token = jwt.encode(
            {'user_id': 'admin_user', 'exp': datetime.now() - timedelta(hours=1)},
            'supersecretkey',
            algorithm='HS256'
        )
        
        client.set_cookie('token', expired_token)
        response = client.get('/admin/deletion-queue')
        
        assert response.status_code == 401
        data = response.get_json()
        assert 'error' in data
        assert data['code'] == 'TOKEN_EXPIRED'
    
    def test_get_deletion_queue_empty(self, client, admin_user):
        """Test getting deletion queue when empty."""
        users_db.truncate()
        
        # Re-create admin user
        admin = User(
            id='admin_user',
            email='admin@example.com',
            first_name='Test',
        last_name='User',
        password='hash',
            marked_for_deletion=False,
            marked_for_deletion_at=None,
            deletion_in_progress=False,
            deletion_attempted_at=None,
            role='admin'
        )
        users_db.insert(admin.to_dict())
        
        client.set_cookie('token', admin_user)
        response = client.get('/admin/deletion-queue')
        
        assert response.status_code == 200
        data = response.get_json()
        assert data['count'] == 0
        assert len(data['users']) == 0


class TestGetDeletionThreshold:
    """Tests for GET /admin/deletion-threshold endpoint."""
    
    def test_get_threshold_success(self, client, admin_user):
        """Test getting current threshold configuration."""
        client.set_cookie('token', admin_user)
        response = client.get('/admin/deletion-threshold')
        
        assert response.status_code == 200
        data = response.get_json()
        
        assert 'threshold_hours' in data
        assert 'threshold_min' in data
        assert 'threshold_max' in data
        assert data['threshold_min'] == MIN_THRESHOLD_HOURS
        assert data['threshold_max'] == MAX_THRESHOLD_HOURS
    
    def test_get_threshold_requires_authentication(self, client):
        """Test that endpoint requires authentication."""
        response = client.get('/admin/deletion-threshold')
        
        assert response.status_code == 401
        data = response.get_json()
        assert data['code'] == 'AUTH_REQUIRED'


class TestUpdateDeletionThreshold:
    """Tests for PUT /admin/deletion-threshold endpoint."""
    
    def test_update_threshold_success(self, client, admin_user):
        """Test updating threshold with valid value."""
        client.set_cookie('token', admin_user)
        response = client.put(
            '/admin/deletion-threshold',
            json={'threshold_hours': 168}
        )
        
        assert response.status_code == 200
        data = response.get_json()
        assert 'message' in data
        assert data['threshold_hours'] == 168
    
    def test_update_threshold_validates_minimum(self, client, admin_user):
        """Test that threshold below minimum is rejected."""
        client.set_cookie('token', admin_user)
        response = client.put(
            '/admin/deletion-threshold',
            json={'threshold_hours': 23}
        )
        
        assert response.status_code == 400
        data = response.get_json()
        assert 'error' in data
        assert data['code'] == 'THRESHOLD_TOO_LOW'
    
    def test_update_threshold_validates_maximum(self, client, admin_user):
        """Test that threshold above maximum is rejected."""
        client.set_cookie('token', admin_user)
        response = client.put(
            '/admin/deletion-threshold',
            json={'threshold_hours': 721}
        )
        
        assert response.status_code == 400
        data = response.get_json()
        assert 'error' in data
        assert data['code'] == 'THRESHOLD_TOO_HIGH'
    
    def test_update_threshold_missing_value(self, client, admin_user):
        """Test that missing threshold value is rejected."""
        client.set_cookie('token', admin_user)
        response = client.put(
            '/admin/deletion-threshold',
            json={}
        )
        
        assert response.status_code == 400
        data = response.get_json()
        assert 'error' in data
        assert data['code'] == 'MISSING_THRESHOLD'
    
    def test_update_threshold_invalid_type(self, client, admin_user):
        """Test that non-integer threshold is rejected."""
        client.set_cookie('token', admin_user)
        response = client.put(
            '/admin/deletion-threshold',
            json={'threshold_hours': 'invalid'}
        )
        
        assert response.status_code == 400
        data = response.get_json()
        assert 'error' in data
        assert data['code'] == 'INVALID_TYPE'
    
    def test_update_threshold_requires_authentication(self, client):
        """Test that endpoint requires authentication."""
        response = client.put(
            '/admin/deletion-threshold',
            json={'threshold_hours': 168}
        )
        
        assert response.status_code == 401


class TestTriggerDeletionQueue:
    """Tests for POST /admin/deletion-queue/trigger endpoint."""
    
    def test_trigger_deletion_success(self, client, admin_user, setup_deletion_queue):
        """Test manually triggering deletion queue."""
        client.set_cookie('token', admin_user)
        response = client.post('/admin/deletion-queue/trigger')
        
        assert response.status_code == 200
        data = response.get_json()
        
        assert 'message' in data
        assert 'processed' in data
        assert 'deleted' in data
        assert 'failed' in data
    
    def test_trigger_deletion_requires_authentication(self, client):
        """Test that endpoint requires authentication."""
        response = client.post('/admin/deletion-queue/trigger')
        
        assert response.status_code == 401
        data = response.get_json()
        assert data['code'] == 'AUTH_REQUIRED'
    
    def test_trigger_deletion_with_empty_queue(self, client, admin_user):
        """Test triggering deletion with empty queue."""
        users_db.truncate()
        
        # Re-create admin user
        admin = User(
            id='admin_user',
            email='admin@example.com',
            first_name='Test',
        last_name='User',
        password='hash',
            marked_for_deletion=False,
            marked_for_deletion_at=None,
            deletion_in_progress=False,
            deletion_attempted_at=None,
            role='admin'
        )
        users_db.insert(admin.to_dict())
        
        client.set_cookie('token', admin_user)
        response = client.post('/admin/deletion-queue/trigger')
        
        assert response.status_code == 200
        data = response.get_json()
        assert data['processed'] == 0


class TestAdminRoleValidation:
    """Tests for admin role validation."""
    
    def test_non_admin_user_access(self, client):
        """
        Test that non-admin users cannot access admin endpoints.
        """
        users_db.truncate()
        
        # Create non-admin user (role='user')
        user = User(
            id='regular_user',
            email='user@example.com',
            first_name='Test',
            last_name='User',
            password='hash',
            marked_for_deletion=False,
            marked_for_deletion_at=None,
            deletion_in_progress=False,
            deletion_attempted_at=None,
            role='user'
        )
        users_db.insert(user.to_dict())
        
        # Create token for non-admin
        token = jwt.encode({'user_id': 'regular_user'}, 'supersecretkey', algorithm='HS256')
        
        client.set_cookie('token', token)
        response = client.get('/admin/deletion-queue')
        
        # Should return 403 Forbidden
        assert response.status_code == 403
        data = response.get_json()
        assert data['code'] == 'ADMIN_REQUIRED'
        assert 'Admin access required' in data['error']
    
    def test_admin_user_access(self, client):
        """
        Test that admin users can access admin endpoints.
        """
        users_db.truncate()
        
        # Create admin user (role='admin')
        admin = User(
            id='admin_user',
            email='admin@example.com',
            first_name='Admin',
            last_name='User',
            password='hash',
            marked_for_deletion=False,
            marked_for_deletion_at=None,
            deletion_in_progress=False,
            deletion_attempted_at=None,
            role='admin'
        )
        users_db.insert(admin.to_dict())
        
        # Create token for admin
        token = jwt.encode({'user_id': 'admin_user'}, 'supersecretkey', algorithm='HS256')
        
        client.set_cookie('token', token)
        response = client.get('/admin/deletion-queue')
        
        # Should succeed
        assert response.status_code == 200
    
    def test_update_threshold_requires_admin(self, client):
        """
        Test that updating deletion threshold requires admin role.
        """
        users_db.truncate()
        
        # Create non-admin user
        user = User(
            id='regular_user',
            email='user@example.com',
            first_name='Test',
            last_name='User',
            password='hash',
            role='user'
        )
        users_db.insert(user.to_dict())
        
        token = jwt.encode({'user_id': 'regular_user'}, 'supersecretkey', algorithm='HS256')
        
        client.set_cookie('token', token)
        response = client.put('/admin/deletion-threshold', json={'threshold_hours': 168})
        
        assert response.status_code == 403
        data = response.get_json()
        assert data['code'] == 'ADMIN_REQUIRED'