"""
定义前后端之间传输的数据格式
"""
from __future__ import annotations
from datetime import datetime
from typing import Optional
from uuid import UUID
from pydantic import BaseModel
from app.models import UserRole

#认证模块（auth）
class TokenResponse(BaseModel):
    access_token: str
    token_type: str = "bearer"

class RegisterRequest(BaseModel):
    username: str
    password: str
    role: UserRole

#用户模块（users）
class UserPublic(BaseModel):
    id: UUID
    username: str
    role: UserRole
    created_at: datetime

#知识图谱模块（knowledge_graph）
class KnowledgeQueryResponse(BaseModel):
    knowledge_code: str
    name: Optional[str] = None
    grade: Optional[str] = None
    category: Optional[str] = None
    definition: Optional[str] = None
    related: list[str] = []
    # 递进：(前置)-[:PREREQUISITE]->(后置)
    prerequisites: list[str] = []  # 必须先掌握的前置（指向当前知识点）
    next_steps: list[str] = []  # 以当前知识点为前置的后续知识点

class PrerequisiteLinkRequest(BaseModel):  # 创建/删除递进关系
    prerequisite_code: str
    dependent_code: str

class KnowledgePointInGraph(BaseModel):  # 图中知识点列表项
    code: str
    name: Optional[str] = None
    grade: Optional[str] = None

class GraphBackfillResponse(BaseModel):
    total: int
    updated: int
    skipped: int

class GraphSeedResponse(BaseModel):
    upserted: int


#习题/测评模块（assessment）
class ExerciseImportSummary(BaseModel): 
    total: int
    created: int
    skipped: int
    errors: list[str] = []

class ExerciseImportPreviewItem(BaseModel):
    title: str
    body: str
    knowledge_code: Optional[str] = None
    difficulty: Optional[int] = None
    question_type: Optional[str] = None
    correct_answer: Optional[str] = None
    resolution: Optional[str] = None

class ExerciseImportPreviewResponse(BaseModel):
    total: int
    valid: int
    invalid: int
    sample: list[ExerciseImportPreviewItem]
    errors: list[str] = []

class ExerciseCreateRequest(BaseModel): #创建/查询题目
    title: str
    body: str
    knowledge_code: Optional[str] = None
    difficulty: Optional[int] = None
    question_type: Optional[str] = None
    correct_answer: Optional[str] = None
    resolution: Optional[str] = None
    weight: int = 0 

class ExerciseBatchRequest(BaseModel):
    ids: list[UUID]

class ExercisePublic(BaseModel): #前端创建题目时传的数据
    id: UUID
    title: str
    body: str
    knowledge_code: Optional[str] = None
    difficulty: Optional[int] = None
    question_type: Optional[str] = None
    correct_answer: Optional[str] = None
    resolution: Optional[str] = None
    knowledge_grade: Optional[str] = None
    knowledge_category: Optional[str] = None
    knowledge_point_name: Optional[str] = None
    weight: Optional[int] = None

class AttemptSubmitRequest(BaseModel): #返回给前端的完整题目信息
    answer: str

class AttemptPublic(BaseModel):
    id: UUID
    user_id: UUID
    exercise_id: UUID
    answer: str
    is_correct: Optional[bool] = None
    score: Optional[float] = None
    created_at: datetime


#AI数字人模块（digital_human）
class AskRequest(BaseModel):
    session_id: Optional[UUID] = None
    question: str
    knowledge_code: Optional[str] = None
    model_name: Optional[str] = None
    model_provider: Optional[str] = None
    model_id: Optional[str] = None

class AskResponse(BaseModel):
    session_id: UUID
    answer: str
    sources: list[str] = []
    tts_status: Optional[str] = None
    audio_base64: Optional[str] = None
    audio_mime: Optional[str] = None

class VoiceAssetItem(BaseModel):
    name: str
    size: int
    url: str


#推荐系统模块（recommendation）
class RecommendRequest(BaseModel):
    knowledge_code: Optional[str] = None
    limit: int = 10
    # topic_weight=开始组卷（按勾选知识点 + 权重）；personalized=个性推荐（错题优先，忽略知识点）
    mode: Optional[str] = None
    # 组卷题量补足时限定范围，避免从全库随机混入其他类别（如代数组卷出现几何题）
    knowledge_grade: Optional[str] = None
    knowledge_category: Optional[str] = None

class RecommendItem(BaseModel):
    item_type: str
    item_ref: str
    reason: Optional[str] = None

class RecommendResponse(BaseModel):
    items: list[RecommendItem]


#学习分析模块（learning_analytics）
class LearningStatsResponse(BaseModel):
    user_id: UUID
    attempts_total: int
    correct_total: int
    accuracy: float

class LearningBreakdownResponse(BaseModel):
    by_grade: list[GradeBreakdownItem]
    by_category: list[CategoryBreakdownItem]
    by_topic: list[TopicBreakdownItem]

class GradeBreakdownItem(BaseModel): #按年级统计做题情况
    grade: str
    attempts: int
    correct: int
    wrong: int
    accuracy: float

class CategoryBreakdownItem(BaseModel): #按知识分类统计
    grade: str
    category: str
    attempts: int
    correct: int
    wrong: int
    accuracy: float

class TopicBreakdownItem(BaseModel): #按知识点统计
    knowledge_code: str
    knowledge_point_name: Optional[str] = None
    knowledge_grade: Optional[str] = None
    knowledge_category: Optional[str] = None
    attempts: int
    correct: int
    wrong: int
    accuracy: float

class StudentLearningStatsItem(BaseModel):
    user_id: UUID
    username: str
    attempts_total: int
    correct_total: int
    accuracy: float


#错题本模块（assessment）
class WrongBookItemPublic(BaseModel):
    id: UUID
    user_id: UUID
    exercise_id: UUID
    knowledge_code: str
    wrong_answer: str
    correct_answer: Optional[str] = None
    created_at: datetime
    # 关联习题展示（与习题测评一致）
    title: Optional[str] = None
    body: Optional[str] = None
    question_type: Optional[str] = None
    resolution: Optional[str] = None
    knowledge_grade: Optional[str] = None
    knowledge_category: Optional[str] = None
    knowledge_point_name: Optional[str] = None

class WrongBookSummaryItem(BaseModel):
    knowledge_code: str
    wrong_count: int

#模块管理模块（modules）
class ModuleRegisterRequest(BaseModel):
    name: str
    base_url: str
    is_enabled: bool = True


class ModulePublic(BaseModel):
    id: UUID
    name: str
    base_url: str
    is_enabled: bool
    updated_at: datetime