from pydantic import BaseModel
from typing import Optional
from datetime import date, datetime
from enum import Enum


class LocationType(str, Enum):
    ulke     = "ulke"
    bolge    = "bolge"
    il       = "il"
    ilce     = "ilce"
    bucak    = "bucak"
    belde    = "belde"
    koy      = "koy"
    mahalle  = "mahalle"
    diger    = "diger"


class Location(BaseModel):
    id:         int
    parent_id:  Optional[int]
    name:       str
    slug:       str
    type:       LocationType
    latitude:   Optional[float]
    longitude:  Optional[float]
    is_active:  bool
    created_at: datetime
    updated_at: datetime


class LocationCreate(BaseModel):
    parent_id:  Optional[int] = None
    name:       str
    slug:       str
    type:       LocationType
    latitude:   Optional[float] = None
    longitude:  Optional[float] = None


class LocationRetype(BaseModel):
    new_type:      LocationType
    change_reason: str
    changed_by:    Optional[int] = None  # user_id


class LocationReparent(BaseModel):
    new_parent_id: int
    change_reason: str
    changed_by:    Optional[int] = None


class LocationSplitFrom(BaseModel):
    source_id:    int
    effective_at: date
    notes:        Optional[str] = None


class LocationMerge(BaseModel):
    source_ids:   list[int]   # birleşen lokasyonlar
    target_id:    int         # hedef (varsa) veya yeni oluşturulacak
    effective_at: date
    notes:        Optional[str] = None
    change_reason: str
    changed_by:   Optional[int] = None