"""Health check and system status endpoints."""

import logging
import asyncio
from datetime import datetime
from typing import Dict, Any

from sanic import Blueprint, Request, response
from sanic.response import JSONResponse

from app.core.config import get_settings
from app.core.database import get_async_session
from app.core.metrics import get_metrics, get_metrics_content_type, metrics_collector
from app.core.background.indexer_service import indexer_service  
from app.core.background.convert_service import convert_service
from app.core.background.ton_service import ton_service

logger = logging.getLogger(__name__)

health_bp = Blueprint("health", version=1)


@health_bp.route("/health", methods=["GET"])
async def health_check(request: Request) -> JSONResponse:
    """Basic health check endpoint."""
    return response.json({
        "status": "healthy",
        "timestamp": datetime.utcnow().isoformat(),
        "service": "my-uploader-bot",
        "version": "2.0.0"
    })


@health_bp.route("/health/detailed", methods=["GET"])
async def detailed_health_check(request: Request) -> JSONResponse:
    """Detailed health check with component status."""
    health_status = {
        "status": "healthy",
        "timestamp": datetime.utcnow().isoformat(),
        "service": "my-uploader-bot",
        "version": "2.0.0",
        "components": {}
    }
    
    overall_healthy = True
    
    # Database health
    try:
        async with get_async_session() as session:
            await session.execute("SELECT 1")
        health_status["components"]["database"] = {
            "status": "healthy",
            "message": "Database connection successful"
        }
    except Exception as e:
        health_status["components"]["database"] = {
            "status": "unhealthy",
            "message": f"Database error: {str(e)}"
        }
        overall_healthy = False
    
    # Redis health
    try:
        import redis.asyncio as redis
        settings = get_settings()
        redis_client = redis.from_url(settings.redis_url)
        await redis_client.ping()
        await redis_client.close()
        
        health_status["components"]["cache"] = {
            "status": "healthy",
            "message": "Redis connection successful"
        }
    except Exception as e:
        health_status["components"]["cache"] = {
            "status": "unhealthy", 
            "message": f"Redis error: {str(e)}"
        }
        overall_healthy = False
    
    # TON service health
    try:
        # Check if TON service is responsive
        test_result = await ton_service.ping()
        health_status["components"]["blockchain"] = {
            "status": "healthy" if test_result else "degraded",
            "message": "TON service available" if test_result else "TON service degraded"
        }
        if not test_result:
            overall_healthy = False
    except Exception as e:
        health_status["components"]["blockchain"] = {
            "status": "unhealthy",
            "message": f"TON service error: {str(e)}"
        }
        overall_healthy = False
    
    # Background services health
    health_status["components"]["background_services"] = {
        "indexer": {
            "status": "healthy" if indexer_service.is_running else "stopped",
            "active_tasks": len([t for t in indexer_service.tasks if not t.done()])
        },
        "converter": {
            "status": "healthy" if convert_service.is_running else "stopped", 
            "active_tasks": len([t for t in convert_service.tasks if not t.done()])
        }
    }
    
    # Update overall status
    if not overall_healthy:
        health_status["status"] = "unhealthy"
    
    status_code = 200 if overall_healthy else 503
    return response.json(health_status, status=status_code)


@health_bp.route("/health/ready", methods=["GET"])
async def readiness_check(request: Request) -> JSONResponse:
    """Kubernetes readiness probe endpoint."""
    try:
        # Quick database check
        async with get_async_session() as session:
            await session.execute("SELECT 1")
        
        return response.json({
            "status": "ready",
            "timestamp": datetime.utcnow().isoformat()
        })
    except Exception as e:
        return response.json({
            "status": "not_ready",
            "error": str(e),
            "timestamp": datetime.utcnow().isoformat()
        }, status=503)


@health_bp.route("/health/live", methods=["GET"])
async def liveness_check(request: Request) -> JSONResponse:
    """Kubernetes liveness probe endpoint."""
    return response.json({
        "status": "alive",
        "timestamp": datetime.utcnow().isoformat()
    })


@health_bp.route("/metrics", methods=["GET"])
async def prometheus_metrics(request: Request):
    """Prometheus metrics endpoint."""
    try:
        metrics_data = await get_metrics()
        return response.raw(
            metrics_data,
            content_type=get_metrics_content_type()
        )
    except Exception as e:
        logger.error(f"Error generating metrics: {e}")
        return response.json({
            "error": "Failed to generate metrics"
        }, status=500)


@health_bp.route("/stats", methods=["GET"])
async def system_stats(request: Request) -> JSONResponse:
    """System statistics endpoint."""
    try:
        stats = {
            "timestamp": datetime.utcnow().isoformat(),
            "uptime": metrics_collector.start_time,
            "services": {}
        }
        
        # Get indexer stats
        try:
            indexer_stats = await indexer_service.get_indexing_stats()
            stats["services"]["indexer"] = indexer_stats
        except Exception as e:
            stats["services"]["indexer"] = {"error": str(e)}
        
        # Get converter stats
        try:
            converter_stats = await convert_service.get_processing_stats()
            stats["services"]["converter"] = converter_stats
        except Exception as e:
            stats["services"]["converter"] = {"error": str(e)}
        
        return response.json(stats)
        
    except Exception as e:
        logger.error(f"Error getting system stats: {e}")
        return response.json({
            "error": "Failed to get system stats"
        }, status=500)


@health_bp.route("/debug/info", methods=["GET"])
async def debug_info(request: Request) -> JSONResponse:
    """Debug information endpoint (development only)."""
    settings = get_settings()
    
    if settings.environment != "development":
        return response.json({
            "error": "Debug endpoint only available in development"
        }, status=403)
    
    debug_data = {
        "timestamp": datetime.utcnow().isoformat(),
        "environment": settings.environment,
        "debug_mode": settings.debug,
        "database_url": settings.database_url.replace(
            settings.database_url.split('@')[0].split('//')[1],
            "***:***"
        ) if '@' in settings.database_url else "***",
        "redis_url": settings.redis_url.replace(
            settings.redis_url.split('@')[0].split('//')[1],
            "***:***"
        ) if '@' in settings.redis_url else "***",
        "storage_backend": settings.storage_backend,
        "ton_network": settings.ton_network,
        "active_tasks": {
            "indexer": len([t for t in indexer_service.tasks if not t.done()]),
            "converter": len([t for t in convert_service.tasks if not t.done()])
        }
    }
    
    return response.json(debug_data)