"""
数据库模型定义

使用 SQLAlchemy ORM 定义 Record 模型
"""

from datetime import datetime
from typing import Optional
from sqlalchemy import Column, Integer, String, Text, DateTime, JSON
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

Base = declarative_base()


class RecordCategory:
    """记录分类常量"""
    TODO = "TODO"       # 待办事项
    NOTE = "NOTE"       # 笔记
    IDEA = "IDEA"       # 灵感
    REF = "REF"         # 参考资料
    FUNNY = "FUNNY"     # 搞笑文案
    TEXT = "TEXT"       # 纯文本

    @classmethod
    def all(cls):
        """获取所有分类类型"""
        return [cls.TODO, cls.NOTE, cls.IDEA, cls.REF, cls.FUNNY, cls.TEXT]

    @classmethod
    def is_valid(cls, category: str) -> bool:
        """验证分类是否有效"""
        return category in cls.all()


class Record(Base):
    """记录模型 - 存储图片识别和AI处理结果"""

    __tablename__ = 'records'

    # 主键
    id = Column(Integer, primary_key=True, autoincrement=True, comment='记录ID')

    # 图片路径
    image_path = Column(String(512), nullable=False, unique=True, index=True, comment='图片存储路径')

    # OCR识别结果
    ocr_text = Column(Text, nullable=True, comment='OCR识别的文本内容')

    # 分类类型
    category = Column(
        String(20),
        nullable=False,
        default=RecordCategory.NOTE,
        index=True,
        comment='记录分类'
    )

    # AI生成的Markdown内容
    ai_result = Column(Text, nullable=True, comment='AI处理生成的Markdown内容')

    # 标签（JSON格式存储）
    tags = Column(JSON, nullable=True, comment='标签列表')

    # 用户备注
    notes = Column(Text, nullable=True, comment='用户手动添加的备注')

    # 时间戳
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False, comment='创建时间')
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False, comment='更新时间')

    def __repr__(self):
        return f"<Record(id={self.id}, category='{self.category}', image_path='{self.image_path}')>"

    def to_dict(self):
        """转换为字典格式"""
        return {
            'id': self.id,
            'image_path': self.image_path,
            'ocr_text': self.ocr_text,
            'category': self.category,
            'ai_result': self.ai_result,
            'tags': self.tags or [],
            'notes': self.notes,
            'created_at': self.created_at.isoformat() if self.created_at else None,
            'updated_at': self.updated_at.isoformat() if self.updated_at else None,
        }

    def update_tags(self, tags: list):
        """更新标签"""
        self.tags = tags

    def add_tag(self, tag: str):
        """添加单个标签"""
        if self.tags is None:
            self.tags = []
        if tag not in self.tags:
            self.tags.append(tag)


# 数据库连接管理
class DatabaseManager:
    """数据库管理器 - 负责连接和会话管理"""

    def __init__(self, db_path: str = "sqlite:///cutnthink.db"):
        """
        初始化数据库管理器

        Args:
            db_path: 数据库连接路径，默认使用SQLite
        """
        self.db_path = db_path
        self.engine = None
        self.SessionLocal = None

    def init_db(self, db_path: Optional[str] = None):
        """
        初始化数据库连接和表结构

        Args:
            db_path: 可选的数据库路径，如果提供则覆盖初始化时的路径
        """
        if db_path:
            self.db_path = db_path

        # 创建数据库引擎
        self.engine = create_engine(
            self.db_path,
            echo=False,  # 不输出SQL日志
            connect_args={"check_same_thread": False}  # SQLite特定配置
        )

        # 创建会话工厂
        self.SessionLocal = sessionmaker(
            autocommit=False,
            autoflush=False,
            bind=self.engine
        )

        # 创建所有表
        Base.metadata.create_all(bind=self.engine)

    def get_session(self):
        """
        获取数据库会话

        Returns:
            SQLAlchemy Session对象
        """
        if self.SessionLocal is None:
            raise RuntimeError("数据库未初始化，请先调用 init_db() 方法")
        return self.SessionLocal()

    def close(self):
        """关闭数据库连接"""
        if self.engine:
            self.engine.dispose()
            self.engine = None
            self.SessionLocal = None


# 全局数据库管理器实例
db_manager = DatabaseManager()


def init_database(db_path: str = "sqlite:////home/congsh/CodeSpace/ClaudeSpace/CutThenThink/data/cutnthink.db"):
    """
    初始化数据库的便捷函数

    Args:
        db_path: 数据库文件路径

    Returns:
        DatabaseManager实例
    """
    db_manager.init_db(db_path)
    return db_manager


def get_db():
    """
    获取数据库会话的便捷函数

    Returns:
        SQLAlchemy Session对象

    Example:
        >>> session = get_db()
        >>> try:
        ...     # 使用session进行数据库操作
        ...     records = session.query(Record).all()
        ... finally:
        ...     session.close()
    """
    return db_manager.get_session()