#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
数据操作层 - 全局分类库 V2

提供: CRUD、版本查询、回滚、冷启动、去重等功能。
所有分类操作基于时间版本标记方案 (stable_id + created/retired_at_execution_id)。
"""
import json
import os
from datetime import datetime
from typing import Optional

from sqlalchemy import func, text
from sqlalchemy.orm import Session

from .db_manager import DatabaseManager1
from .models1 import (
    Post,
    ClassifyExecution,
    GlobalCategory,
    GlobalElement,
    ElementClassificationMapping,
    ClassifyBatch,
    ClassifyExecutionLog,
    PostDecodeTopicPointElement,
    PostClassificationStatus,
)

db_manager = DatabaseManager1()


# ============================================================================
# ClassifyExecution 操作
# ============================================================================

def create_classify_execution(
        execution_type: str = 'classify',
        source_type: str = None,
        based_execution_id: int = 0,
        batch_info: dict = None,
        model_name: str = None,
        trigger_context: str = None,
) -> int:
    """创建执行记录，返回 execution_id"""
    session = db_manager.get_session()
    try:
        execution = ClassifyExecution(
            execution_type=execution_type,
            source_type=source_type,
            based_execution_id=based_execution_id or 0,
            status='running',
            batch_info=batch_info,
            model_name=model_name,
            trigger_context=trigger_context,
            start_time=datetime.now(),
        )
        session.add(execution)
        session.commit()
        execution_id = execution.id
        print(f"[data_operation] 创建执行记录 ID={execution_id}")
        return execution_id
    finally:
        session.close()


def update_classify_execution(
        execution_id: int,
        status: str = None,
        execution_summary: str = None,
        input_tokens: int = None,
        output_tokens: int = None,
        cost_usd: float = None,
        error_message: str = None,
):
    """更新执行记录"""
    session = db_manager.get_session()
    try:
        execution = session.query(ClassifyExecution).filter(
            ClassifyExecution.id == execution_id
        ).first()
        if not execution:
            return
        if status:
            execution.status = status
        if execution_summary:
            execution.execution_summary = execution_summary
        if input_tokens is not None:
            execution.input_tokens = input_tokens
        if output_tokens is not None:
            execution.output_tokens = output_tokens
        if cost_usd is not None:
            execution.cost_usd = cost_usd
        if error_message:
            execution.error_message = error_message
        if status in ('success', 'failed', 'rolled_back'):
            execution.end_time = datetime.now()
        session.commit()
    finally:
        session.close()


def get_latest_execution_id(source_type: str) -> Optional[int]:
    """获取指定 source_type 最近一次成功执行的ID"""
    session = db_manager.get_session()
    try:
        execution = session.query(ClassifyExecution).filter(
            ClassifyExecution.source_type == source_type,
            ClassifyExecution.status == 'success',
        ).order_by(ClassifyExecution.id.desc()).first()
        return execution.id if execution else None
    finally:
        session.close()


# ============================================================================
# GlobalCategory 操作 (时间版本标记)
# ============================================================================

def get_current_categories(source_type: str, session: Session = None) -> list[GlobalCategory]:
    """获取当前有效的所有分类（retired_at_execution_id IS NULL）"""
    own_session = session is None
    if own_session:
        session = db_manager.get_session()
    try:
        return session.query(GlobalCategory).filter(
            GlobalCategory.source_type == source_type,
            GlobalCategory.retired_at_execution_id.is_(None),
        ).all()
    finally:
        if own_session:
            session.close()


def get_category_by_stable_id(stable_id: int, session: Session = None) -> Optional[GlobalCategory]:
    """获取当前有效的某个分类"""
    own_session = session is None
    if own_session:
        session = db_manager.get_session()
    try:
        return session.query(GlobalCategory).filter(
            GlobalCategory.stable_id == stable_id,
            GlobalCategory.retired_at_execution_id.is_(None),
        ).first()
    finally:
        if own_session:
            session.close()


def build_category_tree(source_type: str) -> list[dict]:
    """构建当前分类树（嵌套结构），用于Agent查看"""
    categories = get_current_categories(source_type)

    # 按 stable_id 索引
    by_stable_id = {c.stable_id: c for c in categories}

    # 构建子节点映射
    children_map = {}
    roots = []
    for c in categories:
        node = {
            "stable_id": c.stable_id,
            "name": c.name,
            "description": c.description or "",
            "category_nature": c.category_nature,
            "level": c.level,
            "path": c.path,
            "children": [],
        }
        children_map[c.stable_id] = node

    for c in categories:
        node = children_map[c.stable_id]
        if c.parent_stable_id and c.parent_stable_id in children_map:
            children_map[c.parent_stable_id]["children"].append(node)
        else:
            roots.append(node)

    return roots


def build_category_tree_compact(source_type: str) -> str:
    """构建紧凑文本格式的分类树"""
    tree = build_category_tree(source_type)

    lines = []

    def _render(nodes, indent=0):
        for node in nodes:
            prefix = "  " * indent
            desc_preview = (node["description"][:30] + "...") if len(node["description"]) > 30 else node["description"]
            nature_tag = f"[{node['category_nature']}]" if node.get("category_nature") else ""
            lines.append(
                f"{prefix}[{node['stable_id']}] {node['name']} {nature_tag} — {desc_preview}"
            )
            if node["children"]:
                _render(node["children"], indent + 1)

    _render(tree)
    return "\n".join(lines) if lines else "(空库)"


def _compute_path(parent_stable_id: Optional[int], name: str, session: Session) -> str:
    """计算分类的完整路径"""
    if not parent_stable_id:
        return f"/{name}"
    parent = session.query(GlobalCategory).filter(
        GlobalCategory.stable_id == parent_stable_id,
        GlobalCategory.retired_at_execution_id.is_(None),
    ).first()
    if parent and parent.path:
        return f"{parent.path}/{name}"
    return f"/{name}"


def _compute_level(parent_stable_id: Optional[int], session: Session) -> int:
    """计算分类的层级深度"""
    if not parent_stable_id:
        return 1
    parent = session.query(GlobalCategory).filter(
        GlobalCategory.stable_id == parent_stable_id,
        GlobalCategory.retired_at_execution_id.is_(None),
    ).first()
    if parent:
        return parent.level + 1
    return 1


def create_category(
        name: str,
        description: str,
        source_type: str,
        execution_id: int,
        parent_stable_id: int = None,
        category_nature: str = None,
        create_reason: str = None,
) -> dict:
    """创建新分类，返回 {"stable_id": ..., "id": ...}"""
    session = db_manager.get_session()
    try:
        level = _compute_level(parent_stable_id, session)
        path = _compute_path(parent_stable_id, name, session)

        category = GlobalCategory(
            stable_id=0,  # 临时，commit后用id赋值
            name=name,
            description=description,
            parent_stable_id=parent_stable_id,
            source_type=source_type,
            category_nature=category_nature,
            level=level,
            path=path,
            created_at_execution_id=execution_id,
            retired_at_execution_id=None,
            create_reason=create_reason,
        )
        session.add(category)
        session.flush()
        # stable_id = id (首次创建)
        category.stable_id = category.id
        session.commit()

        return {"stable_id": category.stable_id, "id": category.id, "path": path}
    finally:
        session.close()


def update_category(
        stable_id: int,
        execution_id: int,
        new_name: str = None,
        new_description: str = None,
        new_parent_stable_id: object = "NOT_SET",
        new_category_nature: str = None,
        reason: str = None,
) -> dict:
    """更新分类：retire 旧行 + insert 新行 (同 stable_id)"""
    session = db_manager.get_session()
    try:
        old = session.query(GlobalCategory).filter(
            GlobalCategory.stable_id == stable_id,
            GlobalCategory.retired_at_execution_id.is_(None),
        ).first()
        if not old:
            return {"success": False, "error": f"未找到 stable_id={stable_id} 的当前有效分类"}

        # Retire 旧行
        old.retired_at_execution_id = execution_id
        session.flush()

        # 构建新行
        name = new_name if new_name else old.name
        description = new_description if new_description else old.description
        parent_sid = new_parent_stable_id if new_parent_stable_id != "NOT_SET" else old.parent_stable_id
        nature = new_category_nature if new_category_nature else old.category_nature

        level = _compute_level(parent_sid, session)
        path = _compute_path(parent_sid, name, session)

        new_row = GlobalCategory(
            stable_id=stable_id,
            name=name,
            description=description,
            parent_stable_id=parent_sid,
            source_type=old.source_type,
            category_nature=nature,
            level=level,
            path=path,
            created_at_execution_id=execution_id,
            retired_at_execution_id=None,
            create_reason=reason or f"更新自 id={old.id}",
        )
        session.add(new_row)
        session.commit()

        return {"success": True, "stable_id": stable_id, "new_id": new_row.id, "path": path}
    finally:
        session.close()


def delete_category(stable_id: int, execution_id: int, cascade: bool = False) -> dict:
    """删除分类：retire 当前行。cascade=True 时级联 retire 所有后代"""
    session = db_manager.get_session()
    try:
        current = session.query(GlobalCategory).filter(
            GlobalCategory.stable_id == stable_id,
            GlobalCategory.retired_at_execution_id.is_(None),
        ).first()
        if not current:
            return {"success": False, "error": f"未找到 stable_id={stable_id} 的当前有效分类"}

        retired_ids = [stable_id]
        current.retired_at_execution_id = execution_id

        if cascade:
            # 递归删除所有后代
            to_process = [stable_id]
            while to_process:
                parent_sid = to_process.pop()
                children = session.query(GlobalCategory).filter(
                    GlobalCategory.parent_stable_id == parent_sid,
                    GlobalCategory.retired_at_execution_id.is_(None),
                ).all()
                for child in children:
                    child.retired_at_execution_id = execution_id
                    retired_ids.append(child.stable_id)
                    to_process.append(child.stable_id)

        session.commit()
        return {"success": True, "retired_stable_ids": retired_ids}
    finally:
        session.close()


def move_category(
        stable_id: int,
        new_parent_stable_id: Optional[int],
        execution_id: int,
        reason: str = None,
) -> dict:
    """移动分类到新的父节点，并级联更新所有后代的 path/level。

    与 update_category 的区别：move_category 专注于移动操作，
    自动处理后代节点的路径刷新。
    """
    result = update_category(
        stable_id=stable_id,
        execution_id=execution_id,
        new_parent_stable_id=new_parent_stable_id,
        reason=reason,
    )
    if not result.get("success"):
        return result

    # 级联刷新所有后代的 path/level（原地更新，不产生版本行）
    refreshed = _refresh_descendant_paths(stable_id)
    result["refreshed_descendants"] = refreshed
    return result


def _refresh_descendant_paths(parent_stable_id: int) -> int:
    """递归刷新所有后代的 path/level（原地更新）。
    返回刷新的节点数量。
    """
    session = db_manager.get_session()
    try:
        children = session.query(GlobalCategory).filter(
            GlobalCategory.parent_stable_id == parent_stable_id,
            GlobalCategory.retired_at_execution_id.is_(None),
        ).all()

        count = 0
        child_stable_ids = []
        for child in children:
            new_level = _compute_level(child.parent_stable_id, session)
            new_path = _compute_path(child.parent_stable_id, child.name, session)
            if child.path != new_path or child.level != new_level:
                child.level = new_level
                child.path = new_path
                count += 1
            child_stable_ids.append(child.stable_id)

        session.commit()
    finally:
        session.close()

    # 递归处理每个子节点的后代
    for csid in child_stable_ids:
        count += _refresh_descendant_paths(csid)

    return count


def transfer_elements(
        element_ids: list[int],
        to_category_stable_id: int,
        execution_id: int,
) -> dict:
    """将元素转移到另一个分类。

    同时更新 GlobalElement.belong_category_stable_id 和
    ElementClassificationMapping 中的对应字段。
    """
    session = db_manager.get_session()
    try:
        target = session.query(GlobalCategory).filter(
            GlobalCategory.stable_id == to_category_stable_id,
            GlobalCategory.retired_at_execution_id.is_(None),
        ).first()
        if not target:
            return {"success": False, "error": f"目标分类 stable_id={to_category_stable_id} 不存在"}

        updated = 0
        for eid in element_ids:
            element = session.query(GlobalElement).filter(
                GlobalElement.id == eid,
                GlobalElement.retired_at_execution_id.is_(None),
            ).first()
            if not element:
                continue

            element.belong_category_stable_id = to_category_stable_id
            updated += 1

            # 更新相关映射
            session.query(ElementClassificationMapping).filter(
                ElementClassificationMapping.global_element_id == eid,
            ).update({
                ElementClassificationMapping.global_category_stable_id: to_category_stable_id,
                ElementClassificationMapping.classification_path: target.path or "",
            })

        session.commit()
        return {"success": True, "transferred": updated, "target_path": target.path}
    finally:
        session.close()


def get_orphan_elements(source_type: str) -> list[GlobalElement]:
    """获取孤儿元素：所属分类已被 retire 的有效元素"""
    session = db_manager.get_session()
    try:
        # 获取当前有效分类的 stable_id 集合
        valid_category_ids = set(
            r[0] for r in session.query(GlobalCategory.stable_id).filter(
                GlobalCategory.source_type == source_type,
                GlobalCategory.retired_at_execution_id.is_(None),
            ).all()
        )

        # 获取所有有效元素中，belong_category_stable_id 不在有效分类中的
        elements = session.query(GlobalElement).filter(
            GlobalElement.source_type == source_type,
            GlobalElement.retired_at_execution_id.is_(None),
        ).all()

        return [e for e in elements if e.belong_category_stable_id not in valid_category_ids]
    finally:
        session.close()


def search_categories(name_keyword: str, source_type: str) -> list[GlobalCategory]:
    """按名称模糊搜索当前有效的分类"""
    session = db_manager.get_session()
    try:
        return session.query(GlobalCategory).filter(
            GlobalCategory.name.like(f"%{name_keyword}%"),
            GlobalCategory.source_type == source_type,
            GlobalCategory.retired_at_execution_id.is_(None),
        ).limit(50).all()
    finally:
        session.close()


# ============================================================================
# GlobalElement 操作
# ============================================================================

def get_elements_by_category(
        category_stable_id: int, limit: int = 50, offset: int = 0,
) -> tuple[list[GlobalElement], int]:
    """获取某分类下的当前有效元素，按出现次数降序。返回 (elements, total_count)"""
    session = db_manager.get_session()
    try:
        base_query = session.query(GlobalElement).filter(
            GlobalElement.belong_category_stable_id == category_stable_id,
            GlobalElement.retired_at_execution_id.is_(None),
        )
        total = base_query.count()
        elements = base_query.order_by(
            GlobalElement.occurrence_count.desc()
        ).offset(offset).limit(limit).all()
        return elements, total
    finally:
        session.close()


def search_elements(name_keyword: str, source_type: str = None) -> list[GlobalElement]:
    """按名称搜索当前有效的全局元素"""
    session = db_manager.get_session()
    try:
        query = session.query(GlobalElement).filter(
            GlobalElement.name.like(f"%{name_keyword}%"),
            GlobalElement.retired_at_execution_id.is_(None),
        )
        if source_type:
            query = query.filter(GlobalElement.source_type == source_type)
        return query.limit(50).all()
    finally:
        session.close()


def create_element(
        name: str,
        description: str,
        belong_category_stable_id: int,
        source_type: str,
        execution_id: int,
        occurrence_count: int = 1,
) -> int:
    """创建全局元素，返回 element_id"""
    session = db_manager.get_session()
    try:
        element = GlobalElement(
            name=name,
            description=description,
            belong_category_stable_id=belong_category_stable_id,
            source_type=source_type,
            occurrence_count=occurrence_count,
            created_at_execution_id=execution_id,
            retired_at_execution_id=None,
        )
        session.add(element)
        session.commit()
        return element.id
    finally:
        session.close()


def find_or_create_element(
        name: str,
        description: str,
        belong_category_stable_id: int,
        source_type: str,
        execution_id: int,
) -> tuple[int, bool]:
    """查找已有元素或创建新元素。返回 (element_id, is_new)"""
    session = db_manager.get_session()
    try:
        existing = session.query(GlobalElement).filter(
            GlobalElement.name == name,
            GlobalElement.belong_category_stable_id == belong_category_stable_id,
            GlobalElement.source_type == source_type,
            GlobalElement.retired_at_execution_id.is_(None),
        ).first()

        if existing:
            # 更新出现次数
            existing.occurrence_count = (existing.occurrence_count or 1) + 1
            session.commit()
            return existing.id, False

        element = GlobalElement(
            name=name,
            description=description,
            belong_category_stable_id=belong_category_stable_id,
            source_type=source_type,
            occurrence_count=1,
            created_at_execution_id=execution_id,
            retired_at_execution_id=None,
        )
        session.add(element)
        session.commit()
        return element.id, True
    finally:
        session.close()


# ============================================================================
# ElementClassificationMapping 操作
# ============================================================================

def create_classification_mapping(
        post_element_id: int,
        post_id: str,
        element_name: str,
        element_type: str,
        element_sub_type: str,  # deprecated, 保留参数兼容但不再使用
        global_element_id: int,
        global_category_stable_id: int,
        classification_path: str,
        execution_id: int,
) -> int:
    """创建元素分类映射"""
    session = db_manager.get_session()
    try:
        mapping = ElementClassificationMapping(
            post_decode_topic_point_element_id=post_element_id,
            post_id=post_id,
            element_name=element_name,
            element_type=element_type,
            element_sub_type=None,
            global_element_id=global_element_id,
            global_category_stable_id=global_category_stable_id,
            classification_path=classification_path,
            classify_execution_id=execution_id,
            created_at=datetime.now(),
        )
        session.add(mapping)
        session.commit()
        return mapping.id
    finally:
        session.close()


def batch_create_classification_mappings(mappings_data: list[dict], execution_id: int) -> int:
    """批量创建分类映射，返回创建数量"""
    session = db_manager.get_session()
    try:
        count = 0
        for m in mappings_data:
            mapping = ElementClassificationMapping(
                post_decode_topic_point_element_id=m['post_element_id'],
                post_id=m['post_id'],
                element_name=m['element_name'],
                element_type=m['element_type'],
                element_sub_type=None,
                global_element_id=m['global_element_id'],
                global_category_stable_id=m['global_category_stable_id'],
                classification_path=m.get('classification_path', ''),
                classify_execution_id=execution_id,
                created_at=datetime.now(),
            )
            session.add(mapping)
            count += 1
        session.commit()
        return count
    finally:
        session.close()


# ============================================================================
# 去重与批次准备
# ============================================================================

def get_unclassified_elements(
        source_type: str, limit: int = None,
        offset: int = 0,
        merge_leve2: str = None, post_limit: int = None,
        platform: str = None,
) -> list[dict]:
    """
    获取未分类的元素，按 (element_name, element_type) 去重。

    Args:
        source_type: 实质/形式/意图
        limit: 返回的去重元素数量限制
        offset: 跳过前 N 个去重元素（用于分页取数据）
        merge_leve2: 按帖子二级品类过滤（Post.merge_leve2）
        post_limit: 指定 merge_leve2 下取前 N 个帖子（按默认排序）
        platform: 按平台过滤（Post.platform）

    返回: [{representative_id, element_name, element_type,
            element_description, post_id, all_ids, occurrence_count}, ...]
    """
    session = db_manager.get_session()
    try:
        # 子查询: 已分类的 element ids
        classified_ids_subq = session.query(
            ElementClassificationMapping.post_decode_topic_point_element_id
        ).subquery()

        # 查询未分类元素并去重
        query = session.query(
            func.min(PostDecodeTopicPointElement.id).label('representative_id'),
            PostDecodeTopicPointElement.element_name,
            PostDecodeTopicPointElement.element_type,
            func.min(PostDecodeTopicPointElement.element_description).label('element_description'),
            func.min(PostDecodeTopicPointElement.post_id).label('post_id'),
            func.group_concat(PostDecodeTopicPointElement.id).label('all_ids'),
            func.count(PostDecodeTopicPointElement.id).label('occurrence_count'),
        )

        # 需要 join Post 表的条件
        need_join = merge_leve2 or platform
        post_filters = []
        if merge_leve2:
            post_filters.append(Post.merge_leve2 == merge_leve2)
        if platform:
            post_filters.append(Post.platform == platform)

        if need_join:
            if merge_leve2 and post_limit:
                # 子查询：取该品类下前 N 个帖子的 post_id
                post_ids_query = session.query(Post.post_id).filter(*post_filters).order_by(
                    Post.id.desc()
                ).limit(post_limit).subquery()

                query = query.filter(
                    PostDecodeTopicPointElement.post_id.in_(
                        session.query(post_ids_query.c.post_id)
                    ),
                )
            else:
                query = query.join(
                    Post, PostDecodeTopicPointElement.post_id == Post.post_id
                ).filter(*post_filters)

        query = query.filter(
            PostDecodeTopicPointElement.element_type == source_type,
            PostDecodeTopicPointElement.id.notin_(classified_ids_subq),
        ).group_by(
            PostDecodeTopicPointElement.element_name,
            PostDecodeTopicPointElement.element_type,
        ).order_by(
            func.count(PostDecodeTopicPointElement.id).desc()
        )

        if offset:
            query = query.offset(offset)
        if limit:
            query = query.limit(limit)

        results = query.all()
        return [
            {
                "representative_id": r.representative_id,
                "element_name": r.element_name,
                "element_type": r.element_type,
                "element_description": r.element_description,
                "post_id": r.post_id,
                "all_ids": r.all_ids,
                "occurrence_count": r.occurrence_count,
            }
            for r in results
        ]
    finally:
        session.close()


def filter_auto_linkable_elements(
        unclassified: list[dict],
        source_type: str,
) -> tuple[list[dict], list[dict]]:
    """
    筛选可自动关联的元素（不写入 DB），将未分类元素分为两组。

    Args:
        unclassified: get_unclassified_elements 返回的元素列表
        source_type: 实质/形式/意图

    Returns:
        (remaining, auto_linkable):
            remaining - 需要 Agent 分类的元素列表
            auto_linkable - 可自动关联到已有 GlobalElement 的元素列表
    """
    session = db_manager.get_session()
    try:
        active_elements = session.query(GlobalElement).filter(
            GlobalElement.source_type == source_type,
            GlobalElement.retired_at_execution_id.is_(None),
        ).all()

        ge_map = {}
        for ge in active_elements:
            ge_map[ge.name] = ge

        remaining = []
        auto_linkable = []

        for elem in unclassified:
            if ge_map.get(elem['element_name']):
                auto_linkable.append(elem)
            else:
                remaining.append(elem)

        return remaining, auto_linkable
    finally:
        session.close()


def commit_auto_link_mappings(
        auto_linkable: list[dict],
        source_type: str,
        execution_id: int,
) -> int:
    """
    将可自动关联的元素写入映射关系。

    Args:
        auto_linkable: filter_auto_linkable_elements 返回的可关联元素列表
        source_type: 实质/形式/意图
        execution_id: 执行ID（复用 classify 的执行ID）

    Returns:
        linked_count: 创建的映射数量
    """
    if not auto_linkable:
        return 0

    session = db_manager.get_session()
    try:
        active_elements = session.query(GlobalElement).filter(
            GlobalElement.source_type == source_type,
            GlobalElement.retired_at_execution_id.is_(None),
        ).all()

        ge_map = {}
        for ge in active_elements:
            ge_map[ge.name] = ge

        ge_id_to_path = {}
        if ge_map:
            category_stable_ids = [ge.belong_category_stable_id for ge in ge_map.values()]
            categories = session.query(GlobalCategory).filter(
                GlobalCategory.stable_id.in_(category_stable_ids),
                GlobalCategory.retired_at_execution_id.is_(None),
            ).all()
            stable_id_to_cat = {c.stable_id: c for c in categories}

            for ge in ge_map.values():
                cat = stable_id_to_cat.get(ge.belong_category_stable_id)
                ge_id_to_path[ge.id] = cat.path if cat else None

        linked_count = 0

        for elem in auto_linkable:
            ge = ge_map.get(elem['element_name'])
            if not ge:
                continue

            all_ids = [int(x.strip()) for x in str(elem['all_ids']).split(',') if x.strip()]
            existing_mapped = set(
                r[0] for r in session.query(
                    ElementClassificationMapping.post_decode_topic_point_element_id
                ).filter(
                    ElementClassificationMapping.post_decode_topic_point_element_id.in_(all_ids)
                ).all()
            )
            to_link = [eid for eid in all_ids if eid not in existing_mapped]

            for element_id in to_link:
                original = session.query(PostDecodeTopicPointElement).filter(
                    PostDecodeTopicPointElement.id == element_id
                ).first()
                if not original:
                    continue

                mapping = ElementClassificationMapping(
                    post_decode_topic_point_element_id=element_id,
                    post_id=original.post_id,
                    element_name=elem['element_name'],
                    element_type=source_type,
                    element_sub_type=None,
                    global_element_id=ge.id,
                    global_category_stable_id=ge.belong_category_stable_id,
                    classification_path=ge_id_to_path.get(ge.id),
                    classify_execution_id=execution_id,
                    created_at=datetime.now(),
                )
                session.add(mapping)
                linked_count += 1

            if to_link:
                current_total = session.query(
                    func.count(ElementClassificationMapping.id)
                ).filter(
                    ElementClassificationMapping.global_element_id == ge.id,
                ).scalar() or 0
                ge.occurrence_count = current_total + len(to_link)

        session.commit()

        # 刷新帖子分类完成状态
        if linked_count > 0:
            affected_post_ids = set()
            for elem in auto_linkable:
                all_ids_str = str(elem.get('all_ids', ''))
                if all_ids_str:
                    all_ids = [int(x.strip()) for x in all_ids_str.split(',') if x.strip()]
                    post_ids_rows = session.query(PostDecodeTopicPointElement.post_id).filter(
                        PostDecodeTopicPointElement.id.in_(all_ids)
                    ).distinct().all()
                    affected_post_ids.update(r[0] for r in post_ids_rows)
            if affected_post_ids:
                refresh_post_classification_status(
                    post_ids=list(affected_post_ids),
                    source_type=source_type,
                    execution_id=execution_id,
                )

        return linked_count
    finally:
        session.close()


def backfill_classification_mappings(
        representative_id: int,
        all_ids_str: str,
        execution_id: int,
) -> int:
    """
    将代表元素的映射结果回填到所有相同 (name, type) 的原始元素。
    返回回填数量。
    """
    session = db_manager.get_session()
    try:
        # 获取代表元素的映射
        rep_mapping = session.query(ElementClassificationMapping).filter(
            ElementClassificationMapping.post_decode_topic_point_element_id == representative_id,
        ).first()

        if not rep_mapping:
            return 0

        # 解析 all_ids
        all_ids = [int(x.strip()) for x in str(all_ids_str).split(',') if x.strip()]
        # 排除代表元素自己和已有映射的
        existing_mapped = set(
            r[0] for r in session.query(
                ElementClassificationMapping.post_decode_topic_point_element_id
            ).filter(
                ElementClassificationMapping.post_decode_topic_point_element_id.in_(all_ids)
            ).all()
        )

        to_backfill = [eid for eid in all_ids if eid not in existing_mapped]
        count = 0
        for element_id in to_backfill:
            # 获取原始元素的 post_id
            original = session.query(PostDecodeTopicPointElement).filter(
                PostDecodeTopicPointElement.id == element_id
            ).first()
            if not original:
                continue

            mapping = ElementClassificationMapping(
                post_decode_topic_point_element_id=element_id,
                post_id=original.post_id,
                element_name=rep_mapping.element_name,
                element_type=rep_mapping.element_type,
                element_sub_type=None,
                global_element_id=rep_mapping.global_element_id,
                global_category_stable_id=rep_mapping.global_category_stable_id,
                classification_path=rep_mapping.classification_path,
                classify_execution_id=execution_id,
                created_at=datetime.now(),
            )
            session.add(mapping)
            count += 1

        # 更新 GlobalElement 的 occurrence_count 为实际总出现次数
        if count > 0 and rep_mapping.global_element_id:
            global_element = session.query(GlobalElement).filter(
                GlobalElement.id == rep_mapping.global_element_id,
                GlobalElement.retired_at_execution_id.is_(None),
            ).first()
            if global_element:
                global_element.occurrence_count = len(all_ids)

        session.commit()
        return count
    finally:
        session.close()


# ============================================================================
# ClassifyBatch 操作
# ============================================================================

def create_batch(
        batch_name: str,
        source_type: str,
        total_element_count: int,
        unique_element_count: int,
) -> int:
    """创建批次记录"""
    session = db_manager.get_session()
    try:
        batch = ClassifyBatch(
            batch_name=batch_name,
            source_type=source_type,
            total_element_count=total_element_count,
            unique_element_count=unique_element_count,
            status='pending',
            created_at=datetime.now(),
        )
        session.add(batch)
        session.commit()
        return batch.id
    finally:
        session.close()


def update_batch(batch_id: int, status: str = None, classify_execution_id: int = None):
    """更新批次状态"""
    session = db_manager.get_session()
    try:
        batch = session.query(ClassifyBatch).filter(ClassifyBatch.id == batch_id).first()
        if not batch:
            return
        if status:
            batch.status = status
        if classify_execution_id:
            batch.classify_execution_id = classify_execution_id
        if status in ('success', 'failed'):
            batch.completed_at = datetime.now()
        session.commit()
    finally:
        session.close()


# ============================================================================
# 版本查询与回滚
# ============================================================================

def get_categories_at_execution(execution_id: int, source_type: str) -> list[GlobalCategory]:
    """获取截止到某次执行时的分类状态"""
    session = db_manager.get_session()
    try:
        return session.query(GlobalCategory).filter(
            GlobalCategory.source_type == source_type,
            GlobalCategory.created_at_execution_id <= execution_id,
            (GlobalCategory.retired_at_execution_id.is_(None)) |
            (GlobalCategory.retired_at_execution_id > execution_id),
        ).all()
    finally:
        session.close()


def rollback_execution(execution_id: int) -> dict:
    """
    回滚指定执行ID的所有操作。
    只允许回滚该 source_type 下最新一次 success 的执行，否则拒绝。
    1. 删除该执行创建的所有新行
    2. 恢复该执行废弃的旧行
    3. 标记执行记录为 rolled_back
    """
    session = db_manager.get_session()
    try:
        # 0. 校验：只允许回滚最新一次成功执行
        execution = session.query(ClassifyExecution).filter(
            ClassifyExecution.id == execution_id
        ).first()
        if not execution:
            return {"success": False, "error": f"执行 {execution_id} 不存在"}
        if execution.status != 'success':
            return {"success": False, "error": f"执行 {execution_id} 状态为 {execution.status}，无法回滚"}

        latest = session.query(ClassifyExecution).filter(
            ClassifyExecution.source_type == execution.source_type,
            ClassifyExecution.status == 'success',
        ).order_by(ClassifyExecution.id.desc()).first()

        if not latest or latest.id != execution_id:
            return {
                "success": False,
                "error": f"只能回滚 {execution.source_type} 下最新的成功执行（当前最新为 #{latest.id if latest else 'N/A'}），"
                         f"请先回滚更新的执行后再操作",
            }

        # 0.5 收集受影响的帖子ID（在删除 mappings 前查询）
        affected_post_ids = set()
        affected_mappings = session.query(
            ElementClassificationMapping.post_id,
            ElementClassificationMapping.element_type,
        ).filter(
            ElementClassificationMapping.classify_execution_id == execution_id
        ).distinct().all()
        rollback_source_type = execution.source_type
        for row in affected_mappings:
            if row[0]:
                affected_post_ids.add(row[0])

        # 1. 删除该执行创建的新行
        deleted_categories = session.query(GlobalCategory).filter(
            GlobalCategory.created_at_execution_id == execution_id
        ).delete(synchronize_session='fetch')

        deleted_elements = session.query(GlobalElement).filter(
            GlobalElement.created_at_execution_id == execution_id
        ).delete(synchronize_session='fetch')

        deleted_mappings = session.query(ElementClassificationMapping).filter(
            ElementClassificationMapping.classify_execution_id == execution_id
        ).delete(synchronize_session='fetch')

        # 2. 恢复该执行废弃的旧行
        restored_categories = session.query(GlobalCategory).filter(
            GlobalCategory.retired_at_execution_id == execution_id
        ).update(
            {GlobalCategory.retired_at_execution_id: None},
            synchronize_session='fetch',
        )

        restored_elements = session.query(GlobalElement).filter(
            GlobalElement.retired_at_execution_id == execution_id
        ).update(
            {GlobalElement.retired_at_execution_id: None},
            synchronize_session='fetch',
        )

        # 3. 标记执行记录（execution 已在步骤0中查询）
        execution.status = 'rolled_back'
        execution.end_time = datetime.now()

        session.commit()

        # 4. 刷新受影响帖子的分类完成状态
        if affected_post_ids and rollback_source_type:
            refresh_post_classification_status(
                post_ids=list(affected_post_ids),
                source_type=rollback_source_type,
                execution_id=execution_id,
            )

        result = {
            "success": True,
            "execution_id": execution_id,
            "deleted_categories": deleted_categories,
            "deleted_elements": deleted_elements,
            "deleted_mappings": deleted_mappings,
            "restored_categories": restored_categories,
            "restored_elements": restored_elements,
        }
        print(f"[data_operation] 回滚执行 {execution_id}: {result}")
        return result
    except Exception as e:
        session.rollback()
        return {"success": False, "error": str(e)}
    finally:
        session.close()


# ============================================================================
# 冷启动
# ============================================================================

def cold_start_from_json(json_file_path: str, execution_id: int, source_type: str) -> dict:
    """从 JSON 文件冷启动分类库"""
    if not os.path.exists(json_file_path):
        return {"success": False, "message": f"文件不存在: {json_file_path}"}

    with open(json_file_path, 'r', encoding='utf-8') as f:
        data = json.load(f)

    categories_data = data.get("最终分类树", data.get("categories", []))
    if not categories_data:
        return {"success": False, "message": "JSON 中无分类数据"}

    created_count = 0

    def _import_node(node: dict, parent_stable_id: int = None):
        nonlocal created_count
        name = node.get("分类名称", node.get("name", ""))
        description = node.get("分类说明", node.get("description", ""))
        nature = node.get("分类性质", node.get("category_nature"))

        result = create_category(
            name=name,
            description=description,
            source_type=source_type,
            execution_id=execution_id,
            parent_stable_id=parent_stable_id,
            category_nature=nature,
            create_reason="冷启动导入",
        )
        created_count += 1

        # 递归导入子分类
        children = node.get("子分类", node.get("children", []))
        for child in children:
            _import_node(child, parent_stable_id=result["stable_id"])

    for node in categories_data:
        _import_node(node)

    return {
        "success": True,
        "message": f"冷启动完成，创建 {created_count} 个分类",
        "created_count": created_count,
    }


def cold_start_if_empty(source_type: str, execution_id: int) -> Optional[dict]:
    """检查是否为空库，如果是则执行冷启动"""
    categories = get_current_categories(source_type)
    if categories:
        return None  # 非空库，不需要冷启动

    # 查找冷启动 JSON 文件
    cold_start_files = {
        "实质": "实质元素_通用分类层级定义.json",
        "形式": "形式元素_通用分类层级定义.json",
        "意图": "意图元素_通用分类层级定义.json",
    }

    json_filename = cold_start_files.get(source_type)
    if not json_filename:
        print(f"⚠️ source_type='{source_type}' 的冷启动 JSON 未定义")
        return None

    # 先在 cold_start_data/ 下找，再在当前目录找
    current_dir = os.path.dirname(os.path.abspath(__file__))
    paths_to_try = [
        os.path.join(current_dir, "cold_start_data", json_filename),
        os.path.join(current_dir, json_filename),
        # 也尝试 pattern_global 目录下的文件
        os.path.join(os.path.dirname(current_dir), "pattern_global", json_filename),
    ]

    json_path = None
    for p in paths_to_try:
        if os.path.exists(p):
            json_path = p
            break

    if not json_path:
        print(f"⚠️ 冷启动 JSON 文件不存在，尝试过: {paths_to_try}")
        return None

    print(f"📦 检测到空库，开始冷启动 (source_type='{source_type}', 文件={json_path})")
    result = cold_start_from_json(json_path, execution_id, source_type)
    if result["success"]:
        print(f"✅ 冷启动完成: {result['message']}")
    else:
        print(f"❌ 冷启动失败: {result['message']}")
    return result


# ============================================================================
# 写执行总结
# ============================================================================

# ============================================================================
# 执行日志
# ============================================================================

def save_classify_execution_log(classify_execution_id: int, log_content: str, log_type: str = "classify") -> Optional[int]:
    """保存分类执行日志到数据库"""
    session = db_manager.get_session()
    try:
        log_record = ClassifyExecutionLog(
            classify_execution_id=classify_execution_id,
            log_content=log_content,
            log_type=log_type,
        )
        session.add(log_record)
        session.commit()
        print(f"[data_operation] 执行日志已保存 (execution_id={classify_execution_id}, size={len(log_content)})")
        return log_record.id
    except Exception as e:
        session.rollback()
        print(f"[save_classify_execution_log] 保存日志到数据库失败: {e}")
        return None
    finally:
        session.close()


def get_classify_execution_log(classify_execution_id: int) -> Optional[str]:
    """从数据库获取分类执行日志内容"""
    session = db_manager.get_session()
    try:
        log_record = session.query(ClassifyExecutionLog).filter(
            ClassifyExecutionLog.classify_execution_id == classify_execution_id
        ).first()
        return log_record.log_content if log_record else None
    finally:
        session.close()


def check_classify_execution_logs_exist(execution_ids: list[int]) -> dict[int, bool]:
    """批量检查执行日志是否存在"""
    if not execution_ids:
        return {}
    session = db_manager.get_session()
    try:
        existing_ids = session.query(ClassifyExecutionLog.classify_execution_id).filter(
            ClassifyExecutionLog.classify_execution_id.in_(execution_ids)
        ).all()
        existing_set = {row[0] for row in existing_ids}
        return {eid: (eid in existing_set) for eid in execution_ids}
    finally:
        session.close()


def write_execution_summary(execution_id: int, summary: str):
    """写入执行总结"""
    session = db_manager.get_session()
    try:
        execution = session.query(ClassifyExecution).filter(
            ClassifyExecution.id == execution_id
        ).first()
        if execution:
            execution.execution_summary = summary
            session.commit()
    finally:
        session.close()


# ============================================================================
# 帖子分类完成状态追踪
# ============================================================================

def refresh_post_classification_status(
        post_ids: list[str],
        source_type: str,
        execution_id: int,
):
    """
    刷新指定帖子在指定类型下的分类完成状态。
    幂等设计，可重复调用，结果由源表实时计算。
    """
    if not post_ids:
        return

    session = db_manager.get_session()
    try:
        for post_id in set(post_ids):
            # 统计该帖子该类型的元素总数
            total = session.query(func.count(PostDecodeTopicPointElement.id)).filter(
                PostDecodeTopicPointElement.post_id == post_id,
                PostDecodeTopicPointElement.element_type == source_type,
            ).scalar() or 0

            # 统计已分类的元素数
            classified_subq = session.query(
                ElementClassificationMapping.post_decode_topic_point_element_id
            ).subquery()

            classified = session.query(func.count(PostDecodeTopicPointElement.id)).filter(
                PostDecodeTopicPointElement.post_id == post_id,
                PostDecodeTopicPointElement.element_type == source_type,
                PostDecodeTopicPointElement.id.in_(classified_subq),
            ).scalar() or 0

            is_completed = (classified >= total) and (total > 0)

            # upsert
            existing = session.query(PostClassificationStatus).filter(
                PostClassificationStatus.post_id == post_id,
                PostClassificationStatus.source_type == source_type,
            ).first()

            if existing:
                existing.total_elements = total
                existing.classified_elements = classified
                existing.is_completed = is_completed
                existing.last_updated_execution_id = execution_id
                existing.updated_at = datetime.now()
            else:
                status = PostClassificationStatus(
                    post_id=post_id,
                    source_type=source_type,
                    total_elements=total,
                    classified_elements=classified,
                    is_completed=is_completed,
                    last_updated_execution_id=execution_id,
                    updated_at=datetime.now(),
                )
                session.add(status)

        session.commit()
        print(f"[data_operation] 刷新帖子分类状态: {len(set(post_ids))} 个帖子, source_type={source_type}")
    except Exception as e:
        session.rollback()
        print(f"[data_operation] 刷新帖子分类状态失败: {e}")
    finally:
        session.close()


def get_post_classification_summary(
        post_id: str = None,
        source_type: str = None,
        completed_only: bool = None,
) -> list[dict]:
    """查询帖子分类完成状态"""
    session = db_manager.get_session()
    try:
        query = session.query(PostClassificationStatus)
        if post_id:
            query = query.filter(PostClassificationStatus.post_id == post_id)
        if source_type:
            query = query.filter(PostClassificationStatus.source_type == source_type)
        if completed_only is not None:
            query = query.filter(PostClassificationStatus.is_completed == completed_only)

        results = query.all()
        return [
            {
                "post_id": r.post_id,
                "source_type": r.source_type,
                "total_elements": r.total_elements,
                "classified_elements": r.classified_elements,
                "is_completed": r.is_completed,
                "last_updated_execution_id": r.last_updated_execution_id,
                "updated_at": r.updated_at.isoformat() if r.updated_at else None,
            }
            for r in results
        ]
    finally:
        session.close()


def get_fully_classified_post_ids(
        required_types: list[str] = None,
        min_ratio: float = None,
) -> list[str]:
    """获取分类完成的帖子ID列表。

    Args:
        required_types: 需要检查的元素类型列表，默认 ['实质', '形式', '意图'] 全部检查。
                        如传 ['实质', '形式'] 则忽略意图。
        min_ratio: 完成比例阈值 (0~1)，默认 None 表示使用 is_completed 字段（即 100%）。
                   如传 0.8 则 classified_elements / total_elements >= 0.8 即视为完成。
    """
    if required_types is None:
        required_types = ['实质', '形式', '意图']

    session = db_manager.get_session()
    try:
        query = session.query(PostClassificationStatus.post_id).filter(
            PostClassificationStatus.source_type.in_(required_types),
            PostClassificationStatus.total_elements > 0,
        )

        if min_ratio is not None and min_ratio < 1.0:
            # 按比例判断完成
            query = query.filter(
                (PostClassificationStatus.classified_elements * 1.0 /
                 PostClassificationStatus.total_elements) >= min_ratio
            )
        else:
            # 100% 完成，走索引
            query = query.filter(PostClassificationStatus.is_completed == True)

        results = query.group_by(
            PostClassificationStatus.post_id,
        ).having(
            func.count(func.distinct(PostClassificationStatus.source_type)) == len(required_types)
        ).all()
        return [r[0] for r in results]
    finally:
        session.close()


# ============================================================================
# 建表
# ============================================================================

def create_all_tables():
    """创建所有新表"""
    from .models1 import Base
    Base.metadata.create_all(db_manager.engine)
    print("✅ 所有表已创建/更新")