from typing import Any, Dict

from core.database import get_core_db
from core.security import get_current_user, has_role
from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy import or_
from sqlalchemy.orm import Session

from .dto import IdentifierDTO
from .models import IdentifierCatalog

router = APIRouter(prefix="/identifiers")


@router.get("/", response_model=Dict[str, Any])
async def list_identifiers(
    page: int = Query(1, ge=1, description="Número de página"),
    page_size: int = Query(50, ge=1, le=1000, description="Tamaño de página"),
    level: str = Query(None, description="Filtrar por nivel (G o P)"),
    q: str = Query(None, description="Búsqueda general"),
    db: Session = Depends(get_core_db),
    current_user: dict = Depends(get_current_user),
):
    skip = (page - 1) * page_size
    query = db.query(IdentifierCatalog)
    
    if level:
        query = query.filter(IdentifierCatalog.nivel == level)
        
    if q:
        search_term = f"%{q}%"
        query = query.filter(
            or_(
                IdentifierCatalog.key.ilike(search_term),
                IdentifierCatalog.description.ilike(search_term),
                IdentifierCatalog.complement.ilike(search_term)
            )
        )
    
    items = query.offset(skip).limit(page_size).all()
    total = query.count()
    return {
        "items": [IdentifierDTO.model_validate(obj) for obj in items],
        "total": total,
        "page": page,
        "page_size": page_size,
    }


@router.get("/{key}", response_model=IdentifierDTO)
async def get_identifier(
    key: str,
    db: Session = Depends(get_core_db),
    current_user: dict = Depends(get_current_user),
):
    obj = db.query(IdentifierCatalog).filter(IdentifierCatalog.key == key).first()
    if not obj:
        raise HTTPException(status_code=404, detail="Not found")
    return obj


@router.post("/", response_model=IdentifierDTO, status_code=201)
async def create_identifier(
    data: IdentifierDTO,
    db: Session = Depends(get_core_db),
    current_user: dict = Depends(has_role("admin")),
):
    # Check if already exists
    existing = db.query(IdentifierCatalog).filter(IdentifierCatalog.key == data.key).first()
    if existing:
        raise HTTPException(status_code=400, detail="Identifier with this key already exists")
        
    obj = IdentifierCatalog(**data.dict())
    db.add(obj)
    db.commit()
    db.refresh(obj)
    return obj


@router.put("/{key}", response_model=IdentifierDTO)
async def update_identifier(
    key: str,
    data: IdentifierDTO,
    db: Session = Depends(get_core_db),
    current_user: dict = Depends(has_role("admin")),
):
    obj = db.query(IdentifierCatalog).filter(IdentifierCatalog.key == key).first()
    if not obj:
        raise HTTPException(status_code=404, detail="Not found")
    for field, value in data.dict().items():
        setattr(obj, field, value)
    db.commit()
    db.refresh(obj)
    return obj


@router.delete("/{key}", status_code=204)
async def delete_identifier(
    key: str,
    db: Session = Depends(get_core_db),
    current_user: dict = Depends(has_role("admin")),
):
    obj = db.query(IdentifierCatalog).filter(IdentifierCatalog.key == key).first()
    if not obj:
        raise HTTPException(status_code=404, detail="Not found")
    db.delete(obj)
    db.commit()
    return None