from datetime import datetime
from typing import Optional

from pydantic import BaseModel, Field, field_validator


class AnswerCreate(BaseModel):
    text: str = Field(min_length=1)
    is_correct: bool


class AnswerOut(BaseModel):
    id: int
    text: str
    is_correct: bool

    model_config = {"from_attributes": True}


class QuestionCreate(BaseModel):
    text: str = Field(min_length=1)
    answers: list[AnswerCreate]

    @field_validator("answers")
    @classmethod
    def validate_answers(cls, v: list[AnswerCreate]) -> list[AnswerCreate]:
        if len(v) < 3:
            raise ValueError("Минимум 3 варианта ответа на вопрос")
        if not any(a.is_correct for a in v):
            raise ValueError("Хотя бы один ответ должен быть правильным")
        return v


class QuestionOut(BaseModel):
    id: int
    text: str
    order: int
    answers: list[AnswerOut]

    model_config = {"from_attributes": True}


class TestCreate(BaseModel):
    title: str = Field(min_length=1, max_length=255)
    description: Optional[str] = None
    passing_score: int = Field(ge=0, le=100)
    time_limit: Optional[int] = Field(None, ge=1)
    allow_navigation_back: bool = True
    questions: list[QuestionCreate]

    @field_validator("questions")
    @classmethod
    def validate_questions(cls, v: list[QuestionCreate]) -> list[QuestionCreate]:
        if len(v) < 7:
            raise ValueError("Минимум 7 вопросов в тесте")
        return v


class TestOut(BaseModel):
    id: int
    title: str
    description: Optional[str]
    passing_score: int
    time_limit: Optional[int]
    allow_navigation_back: bool
    is_active: bool
    version: int
    parent_id: Optional[int]
    created_at: datetime
    questions: list[QuestionOut] = []

    model_config = {"from_attributes": True}


class TestUpdateResponse(BaseModel):
    test: TestOut
    is_new_version: bool


class TestListItem(BaseModel):
    id: int
    title: str
    description: Optional[str]
    passing_score: int
    time_limit: Optional[int]
    is_active: bool
    version: int
    created_at: datetime
    questions_count: int = 0

    model_config = {"from_attributes": True}