from datetime import datetime
from typing import Optional

from pydantic import BaseModel, Field


class Token(BaseModel):
    access_token: str
    token_type: str = "bearer"


class LoginRequest(BaseModel):
    username: str
    password: str


class QuestionBase(BaseModel):
    chapter: str = ""
    primary_knowledge: str = ""
    secondary_knowledge: str = ""
    question_type: str = ""
    difficulty: str = ""
    stem: str = Field(..., min_length=1)
    option_a: str = ""
    option_b: str = ""
    option_c: str = ""
    option_d: str = ""
    answer: str = ""
    explanation: str = ""
    notes: str = ""
    source_file: str = ""


class QuestionCreate(QuestionBase):
    pass


class QuestionUpdate(BaseModel):
    chapter: Optional[str] = None
    primary_knowledge: Optional[str] = None
    secondary_knowledge: Optional[str] = None
    question_type: Optional[str] = None
    difficulty: Optional[str] = None
    stem: Optional[str] = None
    option_a: Optional[str] = None
    option_b: Optional[str] = None
    option_c: Optional[str] = None
    option_d: Optional[str] = None
    answer: Optional[str] = None
    explanation: Optional[str] = None
    notes: Optional[str] = None
    source_file: Optional[str] = None


class QuestionOut(QuestionBase):
    id: int
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


class BatchDeleteRequest(BaseModel):
    ids: list[int]


class BatchUpdateRequest(BaseModel):
    ids: list[int]
    chapter: Optional[str] = None
    primary_knowledge: Optional[str] = None
    secondary_knowledge: Optional[str] = None
    question_type: Optional[str] = None
    difficulty: Optional[str] = None


class CategoryBase(BaseModel):
    name: str
    parent_id: Optional[int] = None
    level: int = 1


class CategoryCreate(CategoryBase):
    pass


class CategoryOut(CategoryBase):
    id: int

    class Config:
        from_attributes = True


class ImportHistoryOut(BaseModel):
    id: int
    filename: str
    method: str
    question_count: int
    status: str
    created_at: datetime

    class Config:
        from_attributes = True


class ImportJobItemOut(BaseModel):
    id: int
    job_id: int
    seq: int
    filename: str
    stored_path: str
    status: str
    attempt: int
    error: str
    question_count: int
    started_at: datetime | None
    ended_at: datetime | None

    class Config:
        from_attributes = True


class ImportJobOut(BaseModel):
    id: int
    status: str
    method: str
    total: int
    processed: int
    success_count: int
    failed_count: int
    current_index: int
    current_file: str
    error: str
    attempt: int
    created_at: datetime
    started_at: datetime | None
    ended_at: datetime | None
    updated_at: datetime
    items: list[ImportJobItemOut] = []

    class Config:
        from_attributes = True


class PracticeStartRequest(BaseModel):
    chapter: Optional[str] = None
    secondary_knowledge: Optional[str] = None
    question_type: Optional[str] = None
    difficulty: Optional[str] = None
    random_mode: bool = False
    limit: int = 20


class PracticeCheckRequest(BaseModel):
    question_id: int
    user_answer: str