from fastapi import FastAPI, Depends, HTTPException, status
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.encoders import jsonable_encoder
from contextlib import asynccontextmanager
import json
import asyncio
import uvicorn
import os
from datetime import datetime
from pathlib import Path
import socketio

from .core.unified_coordinator_refactored import UnifiedCoordinatorRefactored as UnifiedCoordinator
from .core.database import engine, get_db, init_database_with_retry, test_database_connection
from .models.user import Base
from .models import agent, project # Import the new agent and project models

# Global unified coordinator instance (will be initialized in lifespan)
unified_coordinator: UnifiedCoordinator = None

@asynccontextmanager
async def lifespan(app: FastAPI):
    """Enhanced application lifespan manager with proper error handling"""
    startup_success = False
    
    try:
        # Startup
        print("🚀 Starting Hive Orchestrator...")
        
        # Initialize database with retry logic
        print("📊 Initializing database...")
        init_database_with_retry()
        
        # Initialize auth database tables and initial data
        print("🔐 Initializing authentication system...")
        from .core.init_db import initialize_database
        initialize_database()
        
        # Initialize coordinator instance
        print("🔧 Initializing unified coordinator...")
        global unified_coordinator
        unified_coordinator = UnifiedCoordinator()
        
        # Test database connection
        if not test_database_connection():
            raise Exception("Database connection test failed")
        
        # Initialize unified coordinator with error handling
        print("🤖 Initializing Unified Coordinator...")
        await unified_coordinator.start()
        
        # Store coordinator in app state for endpoint access
        app.state.hive_coordinator = unified_coordinator
        app.state.unified_coordinator = unified_coordinator
        
        startup_success = True
        print("✅ Hive Orchestrator with Unified Coordinator started successfully!")
        
        yield
        
    except Exception as e:
        print(f"❌ Startup failed: {e}")
        if startup_success:
            # If we got past startup, try to shutdown cleanly
            try:
                await unified_coordinator.shutdown()
            except Exception as shutdown_error:
                print(f"Shutdown error during startup failure: {shutdown_error}")
        raise
    
    finally:
        # Shutdown
        print("🛑 Shutting down Hive Orchestrator...")
        try:
            await unified_coordinator.shutdown()
            print("✅ Hive Orchestrator stopped")
        except Exception as e:
            print(f"❌ Shutdown error: {e}")

# Create FastAPI application with comprehensive OpenAPI configuration
app = FastAPI(
    title="Hive API",
    description="""
    **Hive Unified Distributed AI Orchestration Platform**
    
    A comprehensive platform for managing and orchestrating distributed AI agents across multiple nodes.
    Supports both Ollama-based local agents and CLI-based cloud agents (like Google Gemini).
    
    ## Features
    
    * **Multi-Agent Management**: Register and manage both Ollama and CLI-based AI agents
    * **Task Orchestration**: Distribute and coordinate tasks across specialized agents  
    * **Workflow Engine**: Create and execute complex multi-agent workflows
    * **Real-time Monitoring**: Monitor agent health, task progress, and system performance
    * **Performance Analytics**: Track utilization, success rates, and performance metrics
    * **Authentication**: Secure API access with JWT-based authentication
    
    ## Agent Types
    
    * **kernel_dev**: Linux kernel development and debugging
    * **pytorch_dev**: PyTorch model development and optimization  
    * **profiler**: Performance profiling and optimization
    * **docs_writer**: Documentation generation and technical writing
    * **tester**: Automated testing and quality assurance
    * **cli_gemini**: Google Gemini CLI integration for advanced reasoning
    * **general_ai**: General-purpose AI assistance
    * **reasoning**: Complex reasoning and problem-solving tasks
    
    ## Quick Start
    
    1. Register agents via `/api/agents` endpoint
    2. Create tasks via `/api/tasks` endpoint  
    3. Monitor progress via `/api/status` endpoint
    4. Execute workflows via `/api/workflows` endpoint
    
    For detailed documentation, visit the [Hive Documentation](https://hive.home.deepblack.cloud/docs).
    """,
    version="1.1.0",
    terms_of_service="https://hive.home.deepblack.cloud/terms",
    contact={
        "name": "Hive Development Team",
        "url": "https://hive.home.deepblack.cloud/contact",
        "email": "hive-support@deepblack.cloud",
    },
    license_info={
        "name": "MIT License",
        "url": "https://opensource.org/licenses/MIT",
    },
    servers=[
        {
            "url": "https://hive.home.deepblack.cloud/api",
            "description": "Production server"
        },
        {
            "url": "http://localhost:8087/api", 
            "description": "Development server"
        }
    ],
    openapi_tags=[
        {
            "name": "authentication",
            "description": "User authentication and authorization operations"
        },
        {
            "name": "agents", 
            "description": "Ollama agent management and registration"
        },
        {
            "name": "cli-agents",
            "description": "CLI-based agent management (Google Gemini, etc.)"
        },
        {
            "name": "tasks",
            "description": "Task creation, management, and execution"
        },
        {
            "name": "workflows", 
            "description": "Multi-agent workflow orchestration"
        },
        {
            "name": "executions",
            "description": "Workflow execution tracking and results"
        },
        {
            "name": "monitoring",
            "description": "System health monitoring and metrics"
        },
        {
            "name": "projects",
            "description": "Project management and organization"
        },
        {
            "name": "cluster",
            "description": "Cluster-wide operations and coordination"
        },
        {
            "name": "cluster-registration",
            "description": "Dynamic cluster node registration and management"
        },
        {
            "name": "distributed-workflows",
            "description": "Advanced distributed workflow management"
        },
        {
            "name": "bzzz-integration",
            "description": "Bzzz P2P task coordination system integration"
        }
    ],
    lifespan=lifespan
)

# Enhanced CORS configuration with environment variable support
cors_origins = os.getenv("CORS_ORIGINS", "http://localhost:3000,http://localhost:3001,https://hive.home.deepblack.cloud,http://hive.home.deepblack.cloud")
allowed_origins = [origin.strip() for origin in cors_origins.split(",")]

app.add_middleware(
    CORSMiddleware,
    allow_origins=allowed_origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Dependency injection for unified coordinator
def get_coordinator() -> UnifiedCoordinator:
    """Dependency injection for getting the unified coordinator instance"""
    if unified_coordinator is None:
        raise HTTPException(status_code=503, detail="Coordinator not initialized")
    return unified_coordinator

# Import API routers
from .api import agents, workflows, executions, monitoring, projects, tasks, cluster, distributed_workflows, cli_agents, auth, bzzz_logs, cluster_registration

# Import error handlers and response models
from .core.error_handlers import (
    hive_exception_handler,
    validation_exception_handler, 
    generic_exception_handler,
    HiveAPIException,
    create_health_response,
    check_component_health
)
from .models.responses import HealthResponse, SystemStatusResponse, ErrorResponse, ComponentStatus
from fastapi.exceptions import RequestValidationError
import logging
from .docs_config import custom_openapi_schema

logger = logging.getLogger(__name__)

# Register global exception handlers
app.add_exception_handler(HiveAPIException, hive_exception_handler)
app.add_exception_handler(RequestValidationError, validation_exception_handler)
app.add_exception_handler(Exception, generic_exception_handler)

# Include API routes
app.include_router(auth.router, prefix="/api/auth", tags=["authentication"])
app.include_router(agents.router, prefix="/api", tags=["agents"])
app.include_router(workflows.router, prefix="/api", tags=["workflows"])
app.include_router(executions.router, prefix="/api", tags=["executions"])
app.include_router(monitoring.router, prefix="/api", tags=["monitoring"])
app.include_router(projects.router, prefix="/api", tags=["projects"])
app.include_router(projects.bzzz_router, prefix="/api", tags=["bzzz-integration"])
app.include_router(tasks.router, prefix="/api", tags=["tasks"])
app.include_router(cluster.router, prefix="/api", tags=["cluster"])
app.include_router(cluster_registration.router, prefix="/api", tags=["cluster-registration"])
app.include_router(distributed_workflows.router, tags=["distributed-workflows"])
app.include_router(cli_agents.router, tags=["cli-agents"])
app.include_router(bzzz_logs.router, prefix="/api", tags=["bzzz-logs"])

# Override dependency functions in API modules with our coordinator instance
agents.get_coordinator = get_coordinator
tasks.get_coordinator = get_coordinator  
distributed_workflows.get_coordinator = get_coordinator
cli_agents.get_coordinator = get_coordinator


# Health Check and System Status Endpoints
@app.get(
    "/health",
    response_model=HealthResponse,
    status_code=status.HTTP_200_OK,
    summary="Simple health check",
    description="""
    Basic health check endpoint for monitoring system availability.
    
    This lightweight endpoint provides a quick health status check
    without detailed component analysis. Use this for:
    
    - Load balancer health checks
    - Simple uptime monitoring
    - Basic availability verification
    - Quick status confirmation
    
    For detailed system status including component health,
    use the `/api/health` endpoint instead.
    """,
    tags=["health"],
    responses={
        200: {"description": "System is healthy and operational"},
        503: {"model": ErrorResponse, "description": "System is unhealthy or partially unavailable"}
    }
)
async def health_check() -> HealthResponse:
    """
    Simple health check endpoint.
    
    Returns:
        HealthResponse: Basic health status and timestamp
    """
    return HealthResponse(
        status="healthy",
        version="1.1.0"
    )


@app.get(
    "/api/health",
    response_model=SystemStatusResponse,
    status_code=status.HTTP_200_OK,
    summary="Comprehensive system health check",
    description="""
    Comprehensive health check with detailed component status information.
    
    This endpoint performs thorough health checks on all system components:
    
    **Checked Components:**
    - Database connectivity and performance
    - Coordinator service status
    - Active agent health and availability
    - Task queue status and capacity
    - Memory and resource utilization
    - External service dependencies
    
    **Use Cases:**
    - Detailed system monitoring and alerting
    - Troubleshooting system issues
    - Performance analysis and optimization
    - Operational status dashboards
    - Pre-deployment health verification
    
    **Response Details:**
    - Overall system status and version
    - Component-specific health status
    - Active agent status and utilization
    - Task queue metrics and performance
    - System uptime and performance metrics
    """,
    tags=["health"],
    responses={
        200: {"description": "Detailed system health status retrieved successfully"},
        500: {"model": ErrorResponse, "description": "Health check failed due to system errors"}
    }
)
async def detailed_health_check() -> SystemStatusResponse:
    """
    Comprehensive system health check with component details.
    
    Returns:
        SystemStatusResponse: Detailed system and component health status
        
    Raises:
        HTTPException: If health check encounters critical errors
    """
    try:
        # Check database health
        database_health = check_component_health(
            "database",
            lambda: test_database_connection()
        )
        
        # Check coordinator health
        coordinator_health = check_component_health(
            "coordinator", 
            lambda: unified_coordinator is not None and hasattr(unified_coordinator, 'get_health_status')
        )
        
        # Get coordinator status if available
        coordinator_status = {}
        if unified_coordinator:
            try:
                coordinator_status = await unified_coordinator.get_health_status()
            except Exception as e:
                coordinator_status = {"error": str(e)}
        
        # Build component status list
        components = [
            ComponentStatus(
                name="database",
                status="success" if database_health["status"] == "healthy" else "error",
                details=database_health.get("details", {}),
                last_check=datetime.utcnow()
            ),
            ComponentStatus(
                name="coordinator",
                status="success" if coordinator_health["status"] == "healthy" else "error", 
                details=coordinator_health.get("details", {}),
                last_check=datetime.utcnow()
            )
        ]
        
        # Extract agent information
        agents_info = coordinator_status.get("agents", {})
        total_agents = len(agents_info)
        active_tasks = coordinator_status.get("active_tasks", 0)
        pending_tasks = coordinator_status.get("pending_tasks", 0)
        completed_tasks = coordinator_status.get("completed_tasks", 0)
        
        # Calculate uptime (placeholder - could be enhanced with actual uptime tracking)
        uptime = coordinator_status.get("uptime", 0.0)
        
        return SystemStatusResponse(
            components=components,
            agents=agents_info,
            total_agents=total_agents,
            active_tasks=active_tasks,
            pending_tasks=pending_tasks,
            completed_tasks=completed_tasks,
            uptime=uptime,
            version="1.1.0",
            message="System health check completed successfully"
        )
        
    except Exception as e:
        logger.error(f"Health check failed: {e}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"Health check failed: {str(e)}"
        )


# Configure custom OpenAPI schema
def get_custom_openapi():
    return custom_openapi_schema(app)

app.openapi = get_custom_openapi

# Socket.IO server setup
sio = socketio.AsyncServer(
    async_mode='asgi',
    cors_allowed_origins="*",
    logger=True,
    engineio_logger=False
)

# Socket.IO event handlers
@sio.event
async def connect(sid, environ):
    """Handle client connection"""
    print(f"🔌 Socket.IO client {sid} connected")
    await sio.emit('connection_confirmed', {
        'status': 'connected',
        'timestamp': datetime.now().isoformat(),
        'message': 'Connected to Hive Socket.IO server'
    }, room=sid)

@sio.event
async def disconnect(sid):
    """Handle client disconnection"""
    print(f"🔌 Socket.IO client {sid} disconnected")

@sio.event
async def join_room(sid, data):
    """Handle client joining a room/topic"""
    room = data.get('room', 'general')
    await sio.enter_room(sid, room)
    print(f"🔌 Client {sid} joined room: {room}")
    
    await sio.emit('room_joined', {
        'room': room,
        'timestamp': datetime.now().isoformat(),
        'message': f'Successfully joined {room} room'
    }, room=sid)

@sio.event
async def leave_room(sid, data):
    """Handle client leaving a room/topic"""
    room = data.get('room', 'general')
    await sio.leave_room(sid, room)
    print(f"🔌 Client {sid} left room: {room}")
    
    await sio.emit('room_left', {
        'room': room,
        'timestamp': datetime.now().isoformat(),
        'message': f'Successfully left {room} room'
    }, room=sid)

@sio.event
async def subscribe(sid, data):
    """Handle event subscription"""
    events = data.get('events', [])
    room = data.get('room', 'general')
    
    # Join the room if not already joined
    await sio.enter_room(sid, room)
    
    print(f"🔌 Client {sid} subscribed to events: {events} in room: {room}")
    
    await sio.emit('subscription_confirmed', {
        'events': events,
        'room': room,
        'timestamp': datetime.now().isoformat(),
        'message': f'Subscribed to {len(events)} events in {room} room'
    }, room=sid)

@sio.event
async def ping(sid):
    """Handle ping from client"""
    await sio.emit('pong', {
        'timestamp': datetime.now().isoformat()
    }, room=sid)

# Socket.IO connection manager
class SocketIOManager:
    def __init__(self, socketio_server):
        self.sio = socketio_server
    
    async def send_to_room(self, room: str, event: str, data: dict):
        """Send event to all clients in a room"""
        try:
            await self.sio.emit(event, data, room=room)
        except Exception as e:
            print(f"Error sending to room {room}: {e}")
    
    async def broadcast(self, event: str, data: dict):
        """Broadcast event to all connected clients"""
        try:
            await self.sio.emit(event, data)
        except Exception as e:
            print(f"Error broadcasting event {event}: {e}")
    
    async def send_to_client(self, sid: str, event: str, data: dict):
        """Send event to a specific client"""
        try:
            await self.sio.emit(event, data, room=sid)
        except Exception as e:
            print(f"Error sending to client {sid}: {e}")

manager = SocketIOManager(sio)

# Socket.IO integration with FastAPI
# The socket.io server is integrated below in the app creation

@app.get("/")
async def root():
    """Root endpoint"""
    return {
        "message": "🐝 Welcome to Hive - Distributed AI Orchestration Platform",
        "status": "operational",
        "version": "1.0.0",
        "api_docs": "/docs",
        "timestamp": datetime.now().isoformat()
    }

# Removed duplicate /health endpoint - using the enhanced one above

@app.get("/api/status")
async def get_system_status():
    """Get comprehensive system status"""
    return await unified_coordinator.get_comprehensive_status()

@app.get("/api/metrics")
async def get_metrics():
    """Prometheus metrics endpoint"""
    return await unified_coordinator.get_prometheus_metrics()

# Make manager and coordinator available to other modules
app.state.socketio_manager = manager
app.state.unified_coordinator = unified_coordinator
# Backward compatibility aliases
app.state.hive_coordinator = unified_coordinator
app.state.distributed_coordinator = unified_coordinator

# Create Socket.IO ASGI app
socket_app = socketio.ASGIApp(sio, other_asgi_app=app, socketio_path='/socket.io')

if __name__ == "__main__":
    uvicorn.run(
        "app.main:socket_app",
        host="0.0.0.0",
        port=8000,
        reload=True,
        log_level="info"
    )