from sqlalchemy import create_engine, Column, Integer, String, DateTime, Boolean, Text, cast
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from sqlalchemy.dialects.postgresql import ARRAY
from datetime import datetime
from config import settings


# 定义基类
Base = declarative_base()


class Note(Base):
    """Note数据表映射类"""

    __tablename__ = "note"

    id = Column(Integer, primary_key=True, autoincrement=True)
    content = Column(String, nullable=False)
    tags = Column(ARRAY(String))
    created_at = Column(DateTime, default=datetime.now)
    updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)
    is_deleted = Column(Boolean, default=False)
    name = Column(String)


class NoteManager:
    """Note表操作管理器"""

    def __init__(self, database_url=settings.DATABASE_URL):
        """
        初始化数据库连接

        Args:
            database_url: 数据库连接URL
        """
        self.engine = create_engine(
            database_url,
            echo=True,  # 设置为True可以看到生成的SQL语句
            pool_pre_ping=True,  # 连接池预检测
            pool_size=5,  # 连接池大小
            max_overflow=10,  # 连接池最大连接数
        )

        # 创建数据表（如果不存在）
        Base.metadata.create_all(self.engine)

        # 创建会话工厂
        self.Session = sessionmaker(bind=self.engine)

    def get_session(self):
        """获取新的数据库会话"""
        return self.Session()

    def create_note(self, name, content, tags=None):
        """
        创建新笔记

        Args:
            content: 笔记内容
            tags: 标签列表

        Returns:
            Note: 新创建的Note对象
        """
        with self.get_session() as session:
            try:
                if tags and len(tags) == 0:
                    tags = ["未分类"]
                note = Note(content=content, tags=tags, name=name)
                session.add(note)
                session.commit()
                # print(f"创建笔记成功，ID: {note.id}")
                return note.id
            except Exception as e:
                session.rollback()
                print(f"CREATE NOTE FAILED: {e}")
                return None

    def update_note(self, name, note_id, content=None, tags=None, created_at=None):
        """
        更新笔记

        Args:
            note_id: 笔记ID
            content: 新的内容（可选）
            tags: 新的标签列表（可选）

        Returns:
            bool: 更新成功返回True，失败返回False
        """
        with self.get_session() as session:
            try:
                note = session.query(Note).filter(Note.id == note_id, Note.is_deleted == False).first()
                if note.name != name:
                    session.rollback()
                    print(f"UPDATE NOTE FAILED, NAME NOT MATCH: {e}")
                    return False
                if not note:
                    print(f"NOTE ID NOT FOUND:  {note_id} ")
                    return False

                if content is None:
                    self.delete_note(note_id)
                    return
                else:
                    note.content = content

                if tags is None or len(tags) == 0:
                    note.tags = ["未分类"]
                elif "未分类" in tags and len(tags) > 1:
                    tags.remove("未分类")
                    note.tags = tags
                else:
                    note.tags = tags

                if created_at is None:
                    note.created_at = datetime.now()
                else:
                    note.created_at = created_at

                note.updated_at = datetime.now()
                session.commit()
                # print(f"更新笔记成功，ID: {note_id}")
                return True
            except Exception as e:
                session.rollback()
                return False

    def delete_note(self, name, note_id):
        """
        删除笔记

        Args:
            note_id: 笔记ID

        Returns:
            bool: 删除成功返回True，失败返回False
        """
        with self.get_session() as session:
            try:
                # 软删除
                note = session.query(Note).filter(Note.id == note_id, Note.is_deleted == False).first()
                if note.name != name:
                    session.rollback()
                    print(f"DELETE NOTE FAILED, NAME NOT MATCH: {e}")
                    return False
                if note:
                    note.is_deleted = True
                    note.updated_at = datetime.now()
                    session.commit()
                    # print(f"软删除笔记成功，ID: {note_id}")
                    return True
                else:
                    print(f"NOTE ID NOT FOUND: {note_id} ")
                    return False
            except Exception as e:
                session.rollback()
                print(f"DELETE NOTE FAILED: {e}")
                return False

    def get_note_by_page(self, name, page=1, page_size=10, note_filter="", tag_filter=[]):
        """
        分页查询笔记

        Args:
            page: 当前页码
            page_size: 每页显示的笔记数量
            note_filter: 笔记内容过滤条件（可选）
            tag_filter: 标签过滤条件（可选）

        Returns:
            list: 笔记列表
        """
        with self.get_session() as session:
            try:
                start_idx = (page - 1) * page_size
                query = session.query(Note).filter(Note.name == name, Note.is_deleted == False)
                if note_filter:
                    query = query.filter(Note.content.like(f"%{note_filter}%"))
                if tag_filter and len(tag_filter) > 0:
                    query = query.filter(Note.tags.op("@>")(cast(tag_filter, ARRAY(Text))))
                notes = query.order_by(Note.updated_at.desc()).limit(page_size).offset(start_idx).all()
                for note in notes:
                    note.created_at = note.created_at.strftime("%Y-%m-%d %H:%M:%S")
                    note.updated_at = note.updated_at.strftime("%Y-%m-%d %H:%M:%S")
                return notes
            except Exception as e:
                print(f"GET NOTE BY PAGE FAILED: {e}")
                return []

    def get_total_note_num(self, name, note_filter="", tag_filter=[]):
        """
        获取笔记总数

        Args:
            note_filter: 笔记内容过滤条件（可选）
            tag_filter: 标签过滤条件（可选）

        Returns:
            int: 笔记总数
        """
        with self.get_session() as session:
            try:
                query = session.query(Note).filter(Note.name == name, Note.is_deleted == False)
                if note_filter:
                    query = query.filter(Note.content.like(f"%{note_filter}%"))
                if tag_filter and len(tag_filter) > 0:
                    query = query.filter(Note.tags.op("@>")(cast(tag_filter, ARRAY(Text))))
                count = query.count()
                return count
            except Exception as e:
                print(f"GET TOTAL NOTE NUM FAILED: {e}")
                return 0

    def get_all_tags(self, name, note_filter="", tag_filter=[]):
        """
        获取所有标签

        Args:
            note_filter: 笔记内容过滤条件（可选）
            tag_filter: 标签过滤条件（可选）

        Returns:
            set: 标签集合
        """
        with self.get_session() as session:
            try:
                query = session.query(Note).filter(Note.name == name, Note.is_deleted == False)
                if note_filter:
                    query = query.filter(Note.content.like(f"%{note_filter}%"))
                if tag_filter and len(tag_filter) > 0:
                    query = query.filter(Note.tags.op("@>")(cast(tag_filter, ARRAY(Text))))
                notes = query.all()
                tags = set()
                for note in notes:
                    tags.update(note.tags)
                return tags
            except Exception as e:
                print(f"GET ALL TAGS FAILED: {e}")
                return set()