import json
from datetime import datetime

from pydantic import BaseModel, EmailStr, field_validator


class UserOut(BaseModel):
    id: int
    email: str
    name: str
    student_id: str | None
    role: str
    status: str
    class_id: int | None
    industry: str | None
    company: str | None
    position: str | None
    skills_tags: list[str] | None
    wechat_id: str | None
    phone: str | None
    avatar_url: str | None
    bio: str | None
    created_at: datetime

    model_config = {"from_attributes": True}

    @field_validator("skills_tags", mode="before")
    @classmethod
    def parse_skills_tags(cls, v):
        if isinstance(v, str):
            try:
                return json.loads(v)
            except (json.JSONDecodeError, TypeError):
                return []
        return v


class UserPublic(BaseModel):
    """Shown to same-class approved members (includes contact info)."""
    id: int
    name: str
    student_id: str | None
    industry: str | None
    company: str | None
    position: str | None
    wechat_id: str | None
    phone: str | None
    avatar_url: str | None
    bio: str | None


class UserListItem(BaseModel):
    """For admin user management list."""
    id: int
    email: str
    name: str
    student_id: str | None
    role: str
    status: str
    class_id: int | None
    industry: str | None
    company: str | None
    created_at: datetime

    model_config = {"from_attributes": True}


class UserUpdate(BaseModel):
    email: EmailStr | None = None
    name: str | None = None
    industry: str | None = None
    company: str | None = None
    position: str | None = None
    wechat_id: str | None = None
    phone: str | None = None
    bio: str | None = None


class UserStatusUpdate(BaseModel):
    status: str  # approved | rejected | disabled
    role: str | None = None


class TokenResponse(BaseModel):
    token: str
    user: UserOut