import re
from pydantic import BaseModel, ConfigDict, model_validator, field_validator
from datetime import datetime, date
from typing import Optional

_EMAIL_RE = re.compile(r'^[^@\s]+@[^@\s]+\.[^@\s]+$')


class PersonCreate(BaseModel):
    name: Optional[str] = None          # legacy fallback — auto-split into first/last if provided alone
    first_name: Optional[str] = None
    last_name: Optional[str] = None
    nickname: Optional[str] = None
    email: Optional[str] = None
    phone: Optional[str] = None
    mobile: Optional[str] = None
    address: Optional[str] = None
    birthday: Optional[date] = None
    category: Optional[str] = None
    is_favourite: bool = False
    company: Optional[str] = None
    job_title: Optional[str] = None
    notes: Optional[str] = None

    @model_validator(mode='after')
    def require_some_name(self) -> 'PersonCreate':
        if not any([self.name, self.first_name, self.last_name, self.nickname]):
            raise ValueError('At least one name field is required')
        return self

    @field_validator('email')
    @classmethod
    def validate_email(cls, v: str | None) -> str | None:
        if v and not _EMAIL_RE.match(v):
            raise ValueError('Invalid email address')
        return v


class PersonUpdate(BaseModel):
    # name is intentionally omitted — always computed from first/last/nickname
    first_name: Optional[str] = None
    last_name: Optional[str] = None
    nickname: Optional[str] = None
    email: Optional[str] = None
    phone: Optional[str] = None
    mobile: Optional[str] = None
    address: Optional[str] = None
    birthday: Optional[date] = None
    category: Optional[str] = None
    is_favourite: Optional[bool] = None
    company: Optional[str] = None
    job_title: Optional[str] = None
    notes: Optional[str] = None

    @field_validator('email')
    @classmethod
    def validate_email(cls, v: str | None) -> str | None:
        if v and not _EMAIL_RE.match(v):
            raise ValueError('Invalid email address')
        return v


class PersonResponse(BaseModel):
    id: int
    name: str
    first_name: Optional[str]
    last_name: Optional[str]
    nickname: Optional[str]
    email: Optional[str]
    phone: Optional[str]
    mobile: Optional[str]
    address: Optional[str]
    birthday: Optional[date]
    category: Optional[str]
    relationship: Optional[str]         # deprecated — kept for legacy calendar/birthday compat, will be removed
    is_favourite: bool
    company: Optional[str]
    job_title: Optional[str]
    notes: Optional[str]
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)