"""
Health check handler
Provides service health status checking
"""

from datetime import datetime
from typing import Dict, Any
from fastapi import APIRouter, Depends
from pydantic import BaseModel
from sqlalchemy.orm import Session

from app.database import get_db
from app.services.jenkins_service import get_jenkins_service
from app.services.queue_service import get_queue_service
from app.config import get_settings

router = APIRouter(prefix="/health", tags=["health"])


class JenkinsStatus(BaseModel):
    status: str
    message: str = None


class WorkerPoolStatus(BaseModel):
    active_workers: int
    queue_size: int
    total_processed: int
    total_failed: int


class HealthResponse(BaseModel):
    status: str
    service: str
    version: str
    timestamp: datetime
    jenkins: JenkinsStatus
    worker_pool: WorkerPoolStatus
    database: Dict[str, Any]


@router.get("/", response_model=HealthResponse)
async def health_check(db: Session = Depends(get_db)):
    """
    Health check endpoint
    Check the status of each service component
    """
    settings = get_settings()
    
    # Check Jenkins connection
    jenkins_service = get_jenkins_service()
    jenkins_status = JenkinsStatus(status="disconnected", message="Unable to connect to Jenkins server")
    
    try:
        if await jenkins_service.test_connection():
            jenkins_status = JenkinsStatus(status="connected")
    except Exception as e:
        jenkins_status.message = f"Connection failed: {str(e)}"
    
    # Get worker pool stats
    queue_service = get_queue_service()
    try:
        stats = await queue_service.get_stats()
        worker_pool_status = WorkerPoolStatus(
            active_workers=stats.get("active_workers", 0),
            queue_size=stats.get("queue_size", 0),
            total_processed=stats.get("total_processed", 0),
            total_failed=stats.get("total_failed", 0)
        )
    except Exception as e:
        worker_pool_status = WorkerPoolStatus(
            active_workers=0,
            queue_size=0,
            total_processed=0,
            total_failed=0
        )
    
    # Check database connection
    database_status = {"status": "disconnected", "message": "Database connection failed"}
    try:
        # 尝试执行简单查询
        db.execute("SELECT 1")
        database_status = {"status": "connected"}
    except Exception as e:
        database_status["message"] = f"Database error: {str(e)}"
    
    # Determine overall status
    overall_status = "healthy"
    if jenkins_status.status != "connected":
        overall_status = "unhealthy"
    
    return HealthResponse(
        status=overall_status,
        service="Gitea Webhook Ambassador",
        version=settings.version,
        timestamp=datetime.utcnow(),
        jenkins=jenkins_status,
        worker_pool=worker_pool_status,
        database=database_status
    )


@router.get("/simple")
async def simple_health_check():
    """
    Simple health check endpoint
    For load balancers and monitoring systems
    """
    return {
        "status": "healthy",
        "service": "Gitea Webhook Ambassador",
        "version": "1.0.0"
    }


@router.get("/ready")
async def readiness_check(db: Session = Depends(get_db)):
    """
    Readiness check endpoint
    Check if the service is ready to receive requests
    """
    try:
        # Check database connection
        db.execute("SELECT 1")
        
        # Check Jenkins connection
        jenkins_service = get_jenkins_service()
        jenkins_ready = await jenkins_service.test_connection()
        
        if jenkins_ready:
            return {"status": "ready"}
        else:
            return {"status": "not_ready", "reason": "Jenkins connection failed"}
            
    except Exception as e:
        return {"status": "not_ready", "reason": f"Database connection failed: {str(e)}"}


@router.get("/live")
async def liveness_check():
    """
    Liveness check endpoint
    Check if the service process is running normally
    """
    return {"status": "alive"}