"""
API route handlers
"""
from fastapi import APIRouter, HTTPException, Query, Depends
from typing import Optional, List
from uuid import UUID
from datetime import datetime

from src.schemas import (
    AlertResponse, AlertCreate, AlertUpdate,
    IncidentResponse, IncidentDetailResponse, IncidentCreate, IncidentUpdate,
    AnalysisRequest, AnalysisResponse,
    HealthResponse, StatsResponse,
    ErrorResponse
)

# Create routers
health_router = APIRouter()
alerts_router = APIRouter()
incidents_router = APIRouter()
analysis_router = APIRouter()


# Health Check Endpoints
@health_router.get("/health", response_model=HealthResponse)
async def health_check():
    """Health check endpoint"""
    return {
        "status": "healthy",
        "version": "0.1.0",
        "timestamp": datetime.utcnow(),
        "components": {
            "database": "up",
            "llm": "up",
            "cache": "up"
        }
    }


@health_router.get("/stats", response_model=StatsResponse)
async def get_stats():
    """Get system statistics"""
    return {
        "total_incidents": 0,
        "open_incidents": 0,
        "total_alerts": 0,
        "avg_mttr_minutes": None,
        "incident_stats": {}
    }


# Alert Endpoints
@alerts_router.post("/alerts", response_model=AlertResponse)
async def create_alert(alert: AlertCreate):
    """Create a new alert"""
    return {
        "id": "00000000-0000-0000-0000-000000000000",
        "source": alert.source,
        "title": alert.title,
        "description": alert.description,
        "severity": alert.severity,
        "status": "NEW",
        "category": alert.category,
        "affected_service": alert.affected_service,
        "tags": alert.tags,
        "created_at": datetime.utcnow(),
        "updated_at": datetime.utcnow()
    }


@alerts_router.get("/alerts", response_model=dict)
async def list_alerts(
    severity: Optional[str] = Query(None),
    status: Optional[str] = Query(None),
    source: Optional[str] = Query(None),
    limit: int = Query(100, ge=1, le=1000),
    offset: int = Query(0, ge=0)
):
    """List alerts with filters"""
    return {
        "items": [],
        "total": 0,
        "page": 1,
        "page_size": limit,
        "total_pages": 0
    }


@alerts_router.get("/alerts/{alert_id}", response_model=AlertResponse)
async def get_alert(alert_id: UUID):
    """Get alert by ID"""
    raise HTTPException(status_code=404, detail="Alert not found")


@alerts_router.put("/alerts/{alert_id}", response_model=AlertResponse)
async def update_alert(alert_id: UUID, alert_update: AlertUpdate):
    """Update an alert"""
    raise HTTPException(status_code=404, detail="Alert not found")


# Incident Endpoints
@incidents_router.post("/incidents", response_model=IncidentResponse)
async def create_incident(incident: IncidentCreate):
    """Create a new incident"""
    return {
        "id": "00000000-0000-0000-0000-000000000000",
        "title": incident.title,
        "description": incident.description,
        "severity": incident.severity,
        "status": "OPEN",
        "category": incident.category,
        "affected_services": incident.affected_services,
        "root_cause": None,
        "assigned_to": None,
        "created_at": datetime.utcnow(),
        "updated_at": datetime.utcnow(),
        "resolved_at": None
    }


@incidents_router.get("/incidents", response_model=dict)
async def list_incidents(
    severity: Optional[str] = Query(None),
    status: Optional[str] = Query(None),
    limit: int = Query(100, ge=1, le=1000),
    offset: int = Query(0, ge=0)
):
    """List incidents with filters"""
    return {
        "items": [],
        "total": 0,
        "page": 1,
        "page_size": limit,
        "total_pages": 0
    }


@incidents_router.get("/incidents/{incident_id}", response_model=IncidentDetailResponse)
async def get_incident(incident_id: UUID):
    """Get incident details"""
    raise HTTPException(status_code=404, detail="Incident not found")


@incidents_router.put("/incidents/{incident_id}", response_model=IncidentResponse)
async def update_incident(incident_id: UUID, incident_update: IncidentUpdate):
    """Update an incident"""
    raise HTTPException(status_code=404, detail="Incident not found")


@incidents_router.post("/incidents/{incident_id}/acknowledge")
async def acknowledge_incident(incident_id: UUID):
    """Acknowledge an incident"""
    return {"status": "acknowledged"}


@incidents_router.post("/incidents/{incident_id}/resolve")
async def resolve_incident(incident_id: UUID, resolution: str):
    """Resolve an incident"""
    return {"status": "resolved"}


@incidents_router.get("/incidents/{incident_id}/timeline")
async def get_incident_timeline(incident_id: UUID):
    """Get incident timeline"""
    return []


@incidents_router.post("/incidents/{incident_id}/comments")
async def add_incident_comment(incident_id: UUID, comment: str, user: str):
    """Add comment to incident"""
    return {"status": "added"}


# Analysis Endpoints
@analysis_router.post("/incidents/{incident_id}/analyze", response_model=AnalysisResponse)
async def analyze_incident(incident_id: UUID, request: AnalysisRequest):
    """Trigger analysis on an incident"""
    return {
        "analysis_id": "00000000-0000-0000-0000-000000000000",
        "analysis_type": request.analysis_type,
        "status": "processing",
        "confidence_score": None,
        "results": None
    }


@analysis_router.get("/incidents/{incident_id}/recommendations")
async def get_recommendations(incident_id: UUID):
    """Get recommendations for incident"""
    return []


@analysis_router.post("/alerts/correlate")
async def correlate_alerts(alert_ids: List[UUID], create_incident: bool = True):
    """Correlate alerts into incident"""
    return {
        "incident_id": "00000000-0000-0000-0000-000000000000",
        "correlated_alerts": alert_ids,
        "message": "Alerts correlated successfully"
    }


@analysis_router.post("/alerts/normalize")
async def normalize_alert(raw_alert: dict, source: str):
    """Normalize an alert"""
    return {
        "status": "normalized",
        "normalized_alert": {}
    }