# =============================================================================
# 企微IT智能服务台 — 答题与积分模型
# =============================================================================
# 说明：包含3张表，支撑排队等待期间的答题+积分系统：
#   1. quiz_questions:   IT知识题库（7类×10题=70题起步）
#   2. quiz_answers:     答题记录（每次答题一条记录）
#   3. employee_points:  员工积分账户（跨会话累积，5级等级体系）
#
# 答题双模式：
#   模式A（info_locked=false）— 诊断题：与当前问题相关的选择题，答案附加到会话上下文
#   模式B（info_locked=true）  — IT知识题：纯教育性质，提升IT素养
#
# 插队规则：
#   queue_priority = min(quiz_answered_count // 3, 2)  # 每答3题前移1位，上限2位
# 积分规则：
#   答对 +10分，答错不扣分，跨会话累积
#   0-99 IT小白 → 100-299 IT入门 → 300-599 IT达人 → 600-999 IT专家 → 1000+ IT大师
# =============================================================================

import uuid
from datetime import datetime
from typing import Any, Dict, List, Optional

from sqlalchemy import Boolean, DateTime, Index, Integer, JSON, String, Text
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base


class QuizQuestion(Base):
    """IT知识题库 — 排队等待期间向员工推送的选择题。

    分为两类（通过 type 字段区分）：
    - knowledge: IT知识题（模式B，info_locked=true时推送）
    - diagnostic: 诊断题（模式A，info_locked=false时推送，答案附加到会话上下文）

    诊断题按 problem_category 组织，每类3-5题。
    知识题按 category 组织，每类10题。

    Attributes:
        id: 题目唯一标识（UUID）
        type: 题目类型（knowledge=IT知识题 / diagnostic=诊断题）
        category: 题目类别（network/vpn/email/system/printer/security/office）
        problem_category: 诊断题对应的问题类别（仅diagnostic类型有效，如"vpn_disconnect"）
        difficulty: 难度（easy/medium/hard）
        question: 题目文本
        options: 选项数组（JSON，["选项A", "选项B", "选项C", "选项D"]）
        correct_index: 正确答案索引（0-3）
        explanation: 答案解析
        is_active: 是否启用
        created_at: 创建时间
    """

    __tablename__ = "quiz_questions"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid.uuid4())
    )
    type: Mapped[str] = mapped_column(
        String(20), nullable=False, default="knowledge",
        comment="题目类型: knowledge(IT知识题) / diagnostic(诊断题)"
    )
    category: Mapped[str] = mapped_column(
        String(50), nullable=False,
        comment="题目类别: network/vpn/email/system/printer/security/office"
    )
    problem_category: Mapped[Optional[str]] = mapped_column(
        String(100), nullable=True,
        comment="诊断题对应的问题类别（仅diagnostic类型有效）"
    )
    difficulty: Mapped[str] = mapped_column(
        String(20), nullable=False, default="medium",
        comment="难度: easy/medium/hard"
    )
    question: Mapped[str] = mapped_column(
        Text, nullable=False, comment="题目文本"
    )
    options: Mapped[list] = mapped_column(
        JSON, nullable=False, comment="选项数组: ['选项A', '选项B', ...]"
    )
    correct_index: Mapped[int] = mapped_column(
        Integer, nullable=False, comment="正确答案索引(0-based)"
    )
    explanation: Mapped[Optional[str]] = mapped_column(
        Text, nullable=True, comment="答案解析"
    )
    is_active: Mapped[bool] = mapped_column(
        Boolean, nullable=False, default=True, comment="是否启用"
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=datetime.now,
        comment="创建时间"
    )

    __table_args__ = (
        Index("idx_quiz_q_type", "type"),
        Index("idx_quiz_q_category", "category"),
        Index("idx_quiz_q_active", "is_active"),
    )

    def __repr__(self) -> str:
        return f"<QuizQuestion(id={self.id}, type={self.type}, category={self.category})>"


class QuizAnswer(Base):
    """答题记录 — 每次答题一条记录。

    Attributes:
        id: 记录ID
        employee_id: 员工ID
        conversation_id: 关联会话ID（可空，非排队时答题无会话）
        question_id: 题目ID
        selected_index: 员工选择的答案索引
        is_correct: 是否答对
        points_earned: 获得积分（答对=10，答错=0）
        created_at: 答题时间
    """

    __tablename__ = "quiz_answers"

    id: Mapped[str] = mapped_column(
        String(36), primary_key=True, default=lambda: str(uuid.uuid4())
    )
    employee_id: Mapped[str] = mapped_column(
        String(64), nullable=False, comment="员工ID"
    )
    conversation_id: Mapped[Optional[str]] = mapped_column(
        String(36), nullable=True, comment="关联会话ID"
    )
    question_id: Mapped[str] = mapped_column(
        String(36), nullable=False, comment="题目ID"
    )
    selected_index: Mapped[int] = mapped_column(
        Integer, nullable=False, comment="选择的答案索引"
    )
    is_correct: Mapped[bool] = mapped_column(
        Boolean, nullable=False, comment="是否答对"
    )
    points_earned: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0, comment="获得积分"
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=datetime.now,
        comment="答题时间"
    )

    __table_args__ = (
        Index("idx_quiz_a_employee", "employee_id"),
        Index("idx_quiz_a_conversation", "conversation_id"),
        Index("idx_quiz_a_created", "created_at"),
    )

    def __repr__(self) -> str:
        return f"<QuizAnswer(id={self.id}, employee={self.employee_id}, correct={self.is_correct})>"


class EmployeePoints(Base):
    """员工积分账户 — 跨会话累积，5级等级体系。

    积分规则：答对一题 +10分，答错不扣分。
    等级体系：
      0-99    IT小白    (灰色)
      100-299 IT入门    (蓝色)
      300-599 IT达人    (绿色)
      600-999 IT专家    (琥珀)
      1000+   IT大师    (珊瑚红)

    Attributes:
        employee_id: 员工ID（主键）
        total_points: 累计积分
        answered_count: 答题总数
        correct_count: 答对总数
        level: 当前等级名称
        updated_at: 最后更新时间
    """

    __tablename__ = "employee_points"

    employee_id: Mapped[str] = mapped_column(
        String(64), primary_key=True, comment="员工ID"
    )
    total_points: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0, comment="累计积分"
    )
    answered_count: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0, comment="答题总数"
    )
    correct_count: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0, comment="答对总数"
    )
    level: Mapped[str] = mapped_column(
        String(20), nullable=False, default="IT小白", comment="当前等级"
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, default=datetime.now,
        onupdate=datetime.now, comment="最后更新时间"
    )

    def __repr__(self) -> str:
        return f"<EmployeePoints(employee={self.employee_id}, points={self.total_points}, level={self.level})>"

    @staticmethod
    def calculate_level(points: int) -> str:
        """根据积分计算等级名称。

        Args:
            points: 当前累计积分

        Returns:
            等级名称字符串
        """
        if points >= 1000:
            return "IT大师"
        elif points >= 600:
            return "IT专家"
        elif points >= 300:
            return "IT达人"
        elif points >= 100:
            return "IT入门"
        else:
            return "IT小白"