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


class TagBase(BaseModel):
    name: str = Field(..., min_length=1, max_length=50, description="Tag name")
    color: str = Field(
        default="#3B82F6", pattern=r"^#[0-9A-Fa-f]{6}$", description="Hex color code"
    )


class TagCreate(TagBase):
    pass


class TagUpdate(BaseModel):
    name: Optional[str] = Field(
        None, min_length=1, max_length=50, description="Tag name"
    )
    color: Optional[str] = Field(
        None, pattern=r"^#[0-9A-Fa-f]{6}$", description="Hex color code"
    )


class Tag(TagBase):
    id: int
    created_at: datetime

    class Config:
        from_attributes = True


class TagListResponse(BaseModel):
    items: list[Tag]
    total: int