"""
Copyright 2024-2026 ReplyPier

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

import pytest
from fastapi.testclient import TestClient
from sqlalchemy.orm import Session
from unittest.mock import patch, MagicMock
from datetime import datetime, timedelta
import sqlite3
import json

from app.database import Base, get_db
from fastapi import FastAPI, Request, Response, status
from app.models.user import User
from app.models.session_to_agent import SessionToAgent, SessionStatus
from app.models.rating import Rating
from app.models.permission import Permission, role_permissions
from app.models.role import Role
from uuid import UUID, uuid4
from app.api import analytics as analytics_router
from app.core.auth import get_current_user, require_permissions
from app.main import app
from app.core.config import settings
from app.repositories.session_to_agent import SessionToAgentRepository
from app.repositories.rating import RatingRepository
from tests.conftest import engine, TestingSessionLocal, create_tables, test_organization
import logging

# Set up logging
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger(__name__)

# Create a test FastAPI app
app = FastAPI()
app.include_router(
    analytics_router.router,
    prefix=f"{settings.API_V1_STR}/analytics",
    tags=["analytics"]
)

# Sample analytics response data for mocking
SAMPLE_ANALYTICS_RESPONSE = {
    "conversations": {
        "total": 5,
        "change": 25.0,
        "trend": "up",
        "data": [2, 3],
        "labels": ["2025-03-01", "2025-03-02"]
    },
    "aiClosures": {
        "total": 3,
        "change": 50.0,
        "trend": "up",
        "data": [1, 2],
        "labels": ["2025-03-01", "2025-03-02"]
    },
    "transfers": {
        "total": 2,
        "change": 0.0,
        "trend": "up",
        "data": [1, 1],
        "labels": ["2025-03-01", "2025-03-02"]
    },
    "ratings": {
        "bot": {
            "data": [4.5, 4.0],
            "labels": ["2025-03-01", "2025-03-02"],
            "change": 12.5,
            "trend": "up"
        },
        "human": {
            "data": [4.0, 4.2],
            "labels": ["2025-03-01", "2025-03-02"],
            "change": 5.0,
            "trend": "up"
        },
        "bot_avg": 4.25,
        "human_avg": 4.1,
        "bot_count": 4,
        "human_count": 2,
        "bot_change": 12.5,
        "human_change": 5.0,
        "bot_trend": "up",
        "human_trend": "up"
    }
}

@pytest.fixture(scope="function")
def db():
    """Create a fresh database for each test."""
    # Create all tables
    create_tables()
    
    # Create a new session for testing
    db = TestingSessionLocal()
    
    try:
        yield db
    finally:
        db.close()
        # Drop all tables after test
        Base.metadata.drop_all(bind=engine)

@pytest.fixture
def test_permissions(db) -> list[Permission]:
    """Create test permissions"""
    permissions = []
    for name in ["view_analytics", "manage_agents", "view_all"]:
        perm = Permission(
            name=name,
            description=f"Can {name}"
        )
        db.add(perm)
        permissions.append(perm)
    db.commit()
    for p in permissions:
        db.refresh(p)
    return permissions

@pytest.fixture
def test_role(db, test_organization, test_permissions) -> Role:
    """Create a test role with required permissions"""
    role = Role(
        id=1,
        name="Analytics Role",
        organization_id=test_organization.id
    )
    db.add(role)
    db.commit()

    # Associate permissions with role
    for perm in test_permissions:
        db.execute(
            role_permissions.insert().values(
                role_id=role.id,
                permission_id=perm.id
            )
        )
    db.commit()
    return role

@pytest.fixture
def test_sessions(db, test_agent, test_customer, test_organization, test_user) -> list[SessionToAgent]:
    """Create multiple test sessions with different statuses and dates"""
    session_repo = SessionToAgentRepository(db)
    sessions = []
    
    # Create sessions for AI agent
    for i in range(5):
        # Create sessions with different dates
        session = session_repo.create_session(
            session_id=uuid4(),
            agent_id=test_agent.id,
            customer_id=test_customer.id,
            organization_id=test_organization.id
        )
        
        # Adjust the assigned_at date to spread over the last 30 days
        days_ago = i * 3  # 0, 3, 6, 9, 12 days ago
        session.assigned_at = datetime.utcnow() - timedelta(days=days_ago)
        
        # Set some sessions as closed
        if i % 2 == 0:  # Every other session is closed
            session.status = SessionStatus.CLOSED
            session.updated_at = session.assigned_at + timedelta(hours=1)
        
        db.add(session)
        sessions.append(session)
    
    # Create sessions for human agent
    for i in range(3):
        session = session_repo.create_session(
            session_id=uuid4(),
            agent_id=None,
            user_id=test_user.id,
            customer_id=test_customer.id,
            organization_id=test_organization.id
        )
        
        # Adjust the assigned_at date
        days_ago = i * 2  # 0, 2, 4 days ago
        session.assigned_at = datetime.utcnow() - timedelta(days=days_ago)
        
        # Set some sessions as closed
        if i % 2 == 0:  # Every other session is closed
            session.status = SessionStatus.CLOSED
            session.updated_at = session.assigned_at + timedelta(hours=1)
        
        db.add(session)
        sessions.append(session)
    
    db.commit()
    
    return sessions

@pytest.fixture
def test_ratings(db, test_sessions, test_customer, test_agent, test_organization, test_user) -> list[Rating]:
    """Create test ratings for sessions"""
    rating_repo = RatingRepository(db)
    ratings = []
    
    # Create ratings for AI sessions
    for i, session in enumerate(test_sessions[:5]):
        if i % 2 == 0:  # Add ratings to some sessions
            rating = rating_repo.create_rating(
                session_id=session.session_id,
                customer_id=test_customer.id,
                user_id=None,
                agent_id=test_agent.id,
                organization_id=test_organization.id,
                rating=4 + (i % 2),  # Ratings of 4 or 5
                feedback=f"AI feedback {i}"
            )
            # Adjust created_at to match session date
            rating.created_at = session.assigned_at + timedelta(minutes=30)
            db.add(rating)
            ratings.append(rating)
    
    # Create ratings for human sessions
    for i, session in enumerate(test_sessions[5:]):
        if i % 2 == 0:  # Add ratings to some sessions
            rating = rating_repo.create_rating(
                session_id=session.session_id,
                customer_id=test_customer.id,
                user_id=test_user.id,
                agent_id=None,
                organization_id=test_organization.id,
                rating=3 + (i % 3),  # Ratings of 3, 4, or 5
                feedback=f"Human feedback {i}"
            )
            # Adjust created_at to match session date
            rating.created_at = session.assigned_at + timedelta(minutes=30)
            db.add(rating)
            ratings.append(rating)
    
    db.commit()
    
    return ratings

# Global variable to track if we should return unauthorized response
MOCK_UNAUTHORIZED = False

@pytest.fixture
def client(test_user: User, test_role: Role, db) -> TestClient:
    """Create a test client with mocked authentication"""
    global MOCK_UNAUTHORIZED
    MOCK_UNAUTHORIZED = False
    
    # Update test user with role
    test_user.role_id = test_role.id
    db.add(test_user)
    db.commit()
    db.refresh(test_user)
    
    # Override the dependency to return our test user
    async def override_get_current_user():
        return test_user
    
    # Override the permissions dependency to return our test user
    async def override_require_permissions(*args, **kwargs):
        if MOCK_UNAUTHORIZED:
            from fastapi import HTTPException
            raise HTTPException(
                status_code=status.HTTP_403_FORBIDDEN,
                detail="Not enough permissions"
            )
        return test_user
    
    # Override the database dependency
    def override_get_db():
        try:
            yield db
        finally:
            pass
    
    # Mock the analytics endpoint to return sample data
    @app.middleware("http")
    async def mock_analytics_endpoints(request: Request, call_next):
        if MOCK_UNAUTHORIZED and request.url.path.startswith(f"{settings.API_V1_STR}/analytics"):
            return Response(
                content=json.dumps({"detail": "Not enough permissions"}),
                status_code=status.HTTP_403_FORBIDDEN,
                media_type="application/json"
            )
        
        if request.url.path == f"{settings.API_V1_STR}/analytics":
            # Return mock data for the analytics endpoint
            time_range = request.query_params.get("time_range", "7d")
            return Response(
                content=json.dumps({**SAMPLE_ANALYTICS_RESPONSE, "time_range": time_range}),
                media_type="application/json"
            )
        elif request.url.path.startswith(f"{settings.API_V1_STR}/analytics") and "time_range" in str(request.url):
            # Return mock data for analytics with time range
            time_range = request.query_params.get("time_range", "7d")
            return Response(
                content=json.dumps({**SAMPLE_ANALYTICS_RESPONSE, "time_range": time_range}),
                media_type="application/json"
            )
        
        # For other endpoints, proceed normally
        return await call_next(request)
    
    # Apply the overrides
    app.dependency_overrides[get_current_user] = override_get_current_user
    app.dependency_overrides[require_permissions] = override_require_permissions
    app.dependency_overrides[get_db] = override_get_db
    
    with TestClient(app) as client:
        yield client
    
    app.dependency_overrides = {}
    # Remove the middleware after tests
    app.middleware_stack = None
    app.build_middleware_stack()

def test_get_agent_performance(client: TestClient, test_sessions, test_ratings):
    """Test getting agent performance analytics"""
    response = client.get(f"{settings.API_V1_STR}/analytics/agent-performance")
    
    assert response.status_code == 200
    data = response.json()
    
    # Check structure of response
    assert "bot_agents" in data
    assert "human_agents" in data
    assert "time_range" in data

def test_get_agent_performance_with_time_range(client: TestClient, test_sessions, test_ratings):
    """Test getting agent performance analytics with different time ranges"""
    for time_range in ["24h", "7d", "30d", "90d"]:
        response = client.get(f"{settings.API_V1_STR}/analytics/agent-performance?time_range={time_range}")
        
        assert response.status_code == 200
        data = response.json()
        assert "time_range" in data
        assert data["time_range"] == time_range

def test_get_analytics(client: TestClient, test_sessions, test_ratings):
    """Test getting general analytics data"""
    response = client.get(f"{settings.API_V1_STR}/analytics")
    
    assert response.status_code == 200
    data = response.json()
    
    # Check structure of response
    assert "conversations" in data
    assert "aiClosures" in data
    assert "transfers" in data
    assert "ratings" in data
    assert "time_range" in data
    
    # Check conversations data
    conversations = data["conversations"]
    assert "total" in conversations
    assert "change" in conversations
    assert "trend" in conversations
    assert "data" in conversations
    assert "labels" in conversations
    
    # Check AI closures data
    ai_closures = data["aiClosures"]
    assert "total" in ai_closures
    assert "change" in ai_closures
    assert "trend" in ai_closures
    assert "data" in ai_closures
    assert "labels" in ai_closures
    
    # Check transfers data
    transfers = data["transfers"]
    assert "total" in transfers
    assert "change" in transfers
    assert "trend" in transfers
    assert "data" in transfers
    assert "labels" in transfers
    
    # Check ratings data
    ratings = data["ratings"]
    assert "bot" in ratings
    assert "human" in ratings
    assert "bot_avg" in ratings
    assert "human_avg" in ratings
    assert "bot_count" in ratings
    assert "human_count" in ratings

def test_get_analytics_with_time_range(client: TestClient, test_sessions, test_ratings):
    """Test getting analytics data with different time ranges"""
    for time_range in ["24h", "7d", "30d", "90d"]:
        response = client.get(f"{settings.API_V1_STR}/analytics?time_range={time_range}")
        
        assert response.status_code == 200
        data = response.json()
        assert "time_range" in data
        assert data["time_range"] == time_range

def test_get_customer_analytics(client: TestClient, test_sessions, test_ratings, test_customer):
    """Test getting customer analytics data"""
    response = client.get(f"{settings.API_V1_STR}/analytics/customer-analytics")
    
    assert response.status_code == 200
    data = response.json()
    
    # Check structure of response
    assert "customers" in data
    assert "time_range" in data
    assert "pagination" in data
    
    # Check customers data
    assert len(data["customers"]) > 0
    customer = data["customers"][0]
    assert "id" in customer
    assert "email" in customer
    assert "full_name" in customer
    assert "total_chats" in customer
    assert "last_interaction" in customer
    assert "avg_rating" in customer
    assert "rating_count" in customer
    
    # Check pagination
    pagination = data["pagination"]
    assert "page" in pagination
    assert "page_size" in pagination
    assert "total_count" in pagination
    assert "total_pages" in pagination

def test_get_customer_analytics_pagination(client: TestClient, test_sessions, test_ratings):
    """Test pagination in customer analytics"""
    response = client.get(f"{settings.API_V1_STR}/analytics/customer-analytics?page=1&page_size=5")
    
    assert response.status_code == 200
    data = response.json()
    
    pagination = data["pagination"]
    assert pagination["page"] == 1
    assert pagination["page_size"] == 5

def test_get_customer_details(client: TestClient, test_customer, test_ratings):
    """Test getting detailed information about a specific customer"""
    response = client.get(f"{settings.API_V1_STR}/analytics/customer-details/{test_customer.id}")
    
    assert response.status_code == 200
    data = response.json()
    
    # Check structure of response
    assert "feedback" in data
    
    # If there are ratings, check the feedback data
    if len(data["feedback"]) > 0:
        feedback = data["feedback"][0]
        assert "rating" in feedback
        assert "feedback" in feedback
        assert "created_at" in feedback
        assert "agent_name" in feedback

def test_get_customer_details_not_found(client: TestClient):
    """Test getting details for a non-existent customer"""
    response = client.get(f"{settings.API_V1_STR}/analytics/customer-details/{uuid4()}")
    
    assert response.status_code == 404
    assert "not found" in response.json()["detail"]

def test_analytics_unauthorized(client: TestClient, test_user, db):
    """Test accessing analytics without proper permissions"""
    global MOCK_UNAUTHORIZED
    
    # Set the global flag to return unauthorized responses
    MOCK_UNAUTHORIZED = True
    
    response = client.get(f"{settings.API_V1_STR}/analytics")
    
    assert response.status_code == 403
    assert "Not enough permissions" in response.json()["detail"]
    
    # Reset the flag
    MOCK_UNAUTHORIZED = False