from datetime import date, datetime
from enum import Enum
from uuid import UUID

from pydantic import BaseModel, Field, field_validator


class ExamTypeEnum(str, Enum):
    weekly = "weekly"
    monthly = "monthly"
    final = "final"


class WrongQuestionStatusEnum(str, Enum):
    pending = "pending"
    ocr_done = "ocr_done"
    solved = "solved"
    failed = "failed"


class SchoolLevelEnum(str, Enum):
    junior_high = "junior_high"
    senior_high = "senior_high"


class TokenResponse(BaseModel):
    access_token: str
    refresh_token: str
    token_type: str = "bearer"


class UserRegister(BaseModel):
    username: str = Field(min_length=3, max_length=64)
    password: str = Field(min_length=6, max_length=128)


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


class RefreshRequest(BaseModel):
    refresh_token: str


class UserOut(BaseModel):
    id: UUID
    username: str
    created_at: datetime

    model_config = {"from_attributes": True}


class StudentCreate(BaseModel):
    name: str = Field(min_length=1, max_length=64)
    school_level: SchoolLevelEnum = SchoolLevelEnum.junior_high
    grade: str | None = None
    class_name: str | None = None


class StudentUpdate(BaseModel):
    name: str | None = None
    school_level: SchoolLevelEnum | None = None
    grade: str | None = None
    class_name: str | None = None


class StudentOut(BaseModel):
    id: UUID
    name: str
    school_level: SchoolLevelEnum
    grade: str | None
    class_name: str | None
    created_at: datetime

    model_config = {"from_attributes": True}


class SubjectOut(BaseModel):
    id: int
    name: str

    model_config = {"from_attributes": True}


class ScoreInput(BaseModel):
    subject_id: int
    total_score: float
    obtained_score: float

    @field_validator("total_score")
    @classmethod
    def validate_total(cls, v: float) -> float:
        if v <= 0:
            raise ValueError("总分必须大于0")
        return v

    @field_validator("obtained_score")
    @classmethod
    def validate_obtained(cls, v: float, info) -> float:
        total = info.data.get("total_score")
        if total is not None and v > total:
            raise ValueError("得分不能大于总分")
        if v < 0:
            raise ValueError("得分不能为负")
        return v


class ScoreOut(BaseModel):
    id: UUID
    subject_id: int
    subject_name: str | None = None
    total_score: float
    obtained_score: float
    ratio: float

    model_config = {"from_attributes": True}


class ExamCreate(BaseModel):
    exam_type: ExamTypeEnum
    exam_date: date
    title: str | None = None
    scores: list[ScoreInput] = []


class ExamUpdate(BaseModel):
    exam_type: ExamTypeEnum | None = None
    exam_date: date | None = None
    title: str | None = None
    scores: list[ScoreInput] | None = None


class ExamOut(BaseModel):
    id: UUID
    exam_type: ExamTypeEnum
    exam_date: date
    title: str | None
    created_at: datetime
    scores: list[ScoreOut] = []

    model_config = {"from_attributes": True}


class TrendPoint(BaseModel):
    exam_id: UUID
    exam_type: ExamTypeEnum
    exam_date: date
    title: str | None
    ratio: float
    ratio_percent: float
    delta: float | None = None
    delta_percent: float | None = None
    is_volatile: bool = False
    direction: str | None = None


class TrendResponse(BaseModel):
    subject_id: int
    subject_name: str
    threshold: float
    points: list[TrendPoint]


class WrongQuestionOut(BaseModel):
    id: UUID
    student_id: UUID
    subject_id: int
    subject_name: str | None = None
    image_path: str
    ocr_raw_text: str | None
    question_text: str | None
    solution_text: str | None
    status: WrongQuestionStatusEnum
    created_at: datetime

    model_config = {"from_attributes": True}


class WrongQuestionUpdate(BaseModel):
    question_text: str | None = None
    solution_text: str | None = None
    subject_id: int | None = None