from typing import Optional
from pydantic import BaseModel, Field, field_validator

class ClassroomBaseDTO(BaseModel):
    code: str = Field(..., min_length=1, max_length=50, description="Código o nombre del aula (ej: Aula 101, VIRTUAL-A)")
    floor: str = Field(default="PB", max_length=50, description="Piso o nivel (PB, Piso 1, etc.)")
    capacity: int = Field(default=30, ge=1, le=10000, description="Capacidad máxima de estudiantes")
    description: Optional[str] = Field(default=None, max_length=500, description="Detalles o equipamiento")
    is_active: bool = Field(default=True, description="Estado operativo del aula")

    @field_validator('code')
    @classmethod
    def clean_code(cls, v: str) -> str:
        v = v.strip()
        if not v:
            raise ValueError("El código del aula no puede estar vacío.")
        return v

    @field_validator('floor')
    @classmethod
    def clean_floor(cls, v: str) -> str:
        return str(v).strip() or "PB"

class ClassroomCreateDTO(ClassroomBaseDTO):
    building_id: Optional[int] = Field(default=None, description="ID del edificio asignado")
    building_name: Optional[str] = Field(default=None, description="Nombre de edificio (para creación dinámica)")

class ClassroomUpdateDTO(BaseModel):
    building_id: Optional[int] = None
    code: Optional[str] = None
    floor: Optional[str] = None
    capacity: Optional[int] = None
    description: Optional[str] = None
    is_active: Optional[bool] = None

class ClassroomResponseDTO(ClassroomBaseDTO):
    id: int
    building_id: Optional[int] = None
    building_name: str
    is_virtual: bool
    location_display: str

    class Config:
        from_attributes = True