from datetime import datetime
from typing import Optional
from uuid import UUID
from pydantic import BaseModel, Field
import re


def slugify(name: str) -> str:
    """Convert a name to a URL-safe slug."""
    # Remove non-alphanumeric chars except spaces, convert to lowercase
    slug = re.sub(r'[^a-zA-Z0-9 ]', '', name.lower())
    # Replace spaces with hyphens
    slug = re.sub(r' +', '-', slug.strip())
    return slug


class StepCategoryBase(BaseModel):
    name: str = Field(..., min_length=1, max_length=100)
    description: Optional[str] = None


class StepCategoryCreate(StepCategoryBase):
    account_id: Optional[UUID] = Field(None, description="Account ID for account-specific category. NULL for global.")


class StepCategoryUpdate(BaseModel):
    name: Optional[str] = Field(None, min_length=1, max_length=100)
    description: Optional[str] = None
    display_order: Optional[int] = None
    is_active: Optional[bool] = None


class StepCategoryResponse(StepCategoryBase):
    id: UUID
    slug: str
    account_id: Optional[UUID] = None
    display_order: int
    is_active: bool
    created_at: datetime
    updated_at: datetime
    step_count: int = 0  # Computed field - count of steps in this category

    class Config:
        from_attributes = True


class StepCategoryListResponse(BaseModel):
    id: UUID
    name: str
    slug: str
    description: Optional[str] = None
    account_id: Optional[UUID] = None
    display_order: int
    is_active: bool
    step_count: int = 0

    class Config:
        from_attributes = True