"""
alerts.py
    Contiene endpoint para administrar el CRUD y la lógica de las alertas.
"""

from fastapi import APIRouter, Depends, HTTPException, Request, status
from sqlalchemy.orm import Session
from database import get_db
import models
import schemas
from typing import List, Optional
from datetime import datetime
from auth import get_current_user
from audit import log_action

router = APIRouter()
 
@router.post("/alerts/", response_model=schemas.AlertResponse, tags=['Alerts'])
def create_alert(
    alert:        schemas.AlertCreate,
    request:      Request,
    db:           Session = Depends(get_db),
    current_user: int = Depends(get_current_user)
):
    db_message = db.query(models.Message).filter(
        models.Message.id_mess_g == alert.message_id,
        models.Message.group_id == alert.group_id
    ).first()
    if not db_message:
        raise HTTPException(status_code=404, detail="Message not found")
 
    db_rule = db.query(models.Rule).filter(models.Rule.id == alert.rule_id).first()
    if not db_rule:
        raise HTTPException(status_code=404, detail="Rule not found")
 
    db_alert = models.Alert(
        message_id=alert.message_id,
        group_id=alert.group_id,
        rule_id=alert.rule_id,
        status=alert.status,
        notes=alert.notes,
        created_at=datetime.utcnow()
    )
    db.add(db_alert)
    db.flush()
 
    log_action(
        db=db, entity_type='alert',
        entity_id=db_alert.id,
        action='create', user_id=current_user,
        after=db_alert, ip_address=request.client.host
    )
 
    db.commit()
    db.refresh(db_alert)
    return db_alert
 
@router.get("/alerts/", response_model=List[schemas.AlertResponse], tags=['Alerts'])
def read_alerts(
    skip:         int = 0,
    limit:        int = 100,
    status:       Optional[str] = None,
    severity:     Optional[str] = None,
    date_from:    Optional[datetime] = None,
    date_to:      Optional[datetime] = None,
    db:           Session = Depends(get_db),
    current_user: int = Depends(get_current_user)
):
    query = db.query(models.Alert)
    if status:
        query = query.filter(models.Alert.status == status)
    if severity:
        query = query.filter(models.Alert.rule.has(models.Rule.severity == severity))
    if date_from:
        query = query.filter(models.Alert.created_at >= date_from)
    if date_to:
        query = query.filter(models.Alert.created_at <= date_to)
    return query.offset(skip).limit(limit).all()
 
@router.get("/alerts/{alert_id}", response_model=schemas.AlertResponse, tags=['Alerts'])
def read_alert(
    alert_id:     int,
    db:           Session = Depends(get_db),
    current_user: int = Depends(get_current_user)
):
    db_alert = db.query(models.Alert).filter(models.Alert.id == alert_id).first()
    if not db_alert:
        raise HTTPException(status_code=404, detail="Alert not found")
    return db_alert
 
@router.put("/alerts/{alert_id}", response_model=schemas.AlertResponse, tags=['Alerts'])
def update_alert(
    alert_id:     int,
    alert:        schemas.AlertCreate,
    request:      Request,
    db:           Session = Depends(get_db),
    current_user: int = Depends(get_current_user)
):
    db_alert = db.query(models.Alert).filter(models.Alert.id == alert_id).first()
    if not db_alert:
        raise HTTPException(status_code=404, detail="Alert not found")
 
    before_snapshot = {
        'id': db_alert.id,
        'message_id': db_alert.message_id,
        'group_id': db_alert.group_id,
        'rule_id': db_alert.rule_id,
        'status': db_alert.status,
        'notes': db_alert.notes,
    }
 
    for field, value in alert.model_dump().items():
        setattr(db_alert, field, value)
 
    log_action(
        db=db, entity_type='alert', entity_id=alert_id,
        action='update', user_id=current_user,
        before=before_snapshot, after=db_alert,
        ip_address=request.client.host
    )
 
    db.commit()
    db.refresh(db_alert)
    return db_alert
 
@router.delete("/alerts/{alert_id}", tags=['Alerts'])
def delete_alert(
    alert_id:     int,
    request:      Request,
    db:           Session = Depends(get_db),
    current_user: int = Depends(get_current_user)
):
    db_alert = db.query(models.Alert).filter(models.Alert.id == alert_id).first()
    if not db_alert:
        raise HTTPException(status_code=404, detail="Alert not found")
 
    log_action(
        db=db, entity_type='alert', entity_id=alert_id,
        action='delete', user_id=current_user,
        before=db_alert, ip_address=request.client.host
    )
 
    db.delete(db_alert)
    db.commit()
    return {"message": "Alert deleted successfully"}
 
@router.post("/alerts/{alert_id}/resolve", tags=['Alerts'])
def resolve_alert(
    alert_id:     int,
    request:      Request,
    db:           Session = Depends(get_db),
    current_user: int = Depends(get_current_user)
):
    db_alert = db.query(models.Alert).filter(models.Alert.id == alert_id).first()
    if not db_alert:
        raise HTTPException(status_code=404, detail="Alert not found")
 
    log_action(
        db=db, entity_type='alert', entity_id=alert_id,
        action='status_change', user_id=current_user,
        before={'status': db_alert.status},
        after={'status': 'close'},
        ip_address=request.client.host
    )
 
    db_alert.status = "close"
    db.commit()
    db.refresh(db_alert)
    return db_alert
 
@router.post("/alerts/{alert_id}/reopen", tags=['Alerts'])
def open_alert(
    alert_id:     int,
    request:      Request,
    db:           Session = Depends(get_db),
    current_user: int = Depends(get_current_user)
):
    db_alert = db.query(models.Alert).filter(models.Alert.id == alert_id).first()
    if not db_alert:
        raise HTTPException(status_code=404, detail="Alert not found")
 
    log_action(
        db=db, entity_type='alert', entity_id=alert_id,
        action='status_change', user_id=current_user,
        before={'status': db_alert.status},
        after={'status': 'open'},
        ip_address=request.client.host
    )
    db_alert.status = "open"
    db.commit()
    db.refresh(db_alert)
    return db_alert

@router.post("/alerts/{alert_id}/in-progress", tags=['Alerts'])
def set_alert_in_progress(
    alert_id:     int,
    request:      Request,
    db:           Session = Depends(get_db),
    current_user: int = Depends(get_current_user)
):
    db_alert = db.query(models.Alert).filter(models.Alert.id == alert_id).first()
    if not db_alert:
        raise HTTPException(status_code=404, detail="Alert not found")

    # Solo cambiar si está abierta, no sobreescribir estados más avanzados
    if db_alert.status != "open":
        return db_alert

    log_action(
        db=db, entity_type='alert', entity_id=alert_id,
        action='status_change', user_id=current_user,
        before={'status': db_alert.status},
        after={'status': 'in_progress'},
        ip_address=request.client.host
    )

    db_alert.status = "in_progress"
    db.commit()
    db.refresh(db_alert)
    return db_alert