from __future__ import annotations

from typing import ClassVar

from pydantic import (
    AnyHttpUrl,
    BaseModel,
    ConfigDict,
    Field,
    field_validator,
    model_validator,
)


class UserResponse(BaseModel):
    id: str
    username: str
    avatar_url: str | None = None
    bio: str | None = None


class UserSearchRequest(BaseModel):
    query: str = Field(min_length=1, max_length=100)


class UserSearchResult(BaseModel):
    id: str
    username: str
    avatar_url: str | None = None
    bio: str | None = None


class UserUpdateRequest(BaseModel):
    model_config: ClassVar[ConfigDict] = ConfigDict(extra="forbid")

    username: str | None = Field(default=None, min_length=3, max_length=30)
    avatar_url: str | None = Field(default=None)
    bio: str | None = Field(default=None, max_length=200)

    @field_validator("avatar_url", mode="before")
    @classmethod
    def validate_avatar_url(cls, v: str | None) -> str | None:
        if v is None:
            return None
        parsed = AnyHttpUrl(v)
        if parsed.scheme not in ("http", "https"):
            raise ValueError("avatar_url must use http or https scheme")
        return str(parsed)

    @model_validator(mode="after")
    def require_one_field(self) -> "UserUpdateRequest":
        if self.username is None and self.avatar_url is None and self.bio is None:
            raise ValueError("At least one field must be provided")
        return self