"""
Zep检索工具服务
封装图谱搜索、节点读取、边查询等工具，供Report Agent使用
"""

import time
from typing import Dict, Any, List, Optional
from dataclasses import dataclass

from zep_cloud.client import Zep

from ..config import Config
from ..utils.logger import get_logger

logger = get_logger('mirofish.zep_tools')


@dataclass
class SearchResult:
    """搜索结果"""
    facts: List[str]
    edges: List[Dict[str, Any]]
    nodes: List[Dict[str, Any]]
    query: str
    total_count: int
    
    def to_dict(self) -> Dict[str, Any]:
        return {
            "facts": self.facts,
            "edges": self.edges,
            "nodes": self.nodes,
            "query": self.query,
            "total_count": self.total_count
        }
    
    def to_text(self) -> str:
        """转换为文本格式，供LLM理解"""
        text_parts = [f"搜索查询: {self.query}", f"找到 {self.total_count} 条相关信息"]
        
        if self.facts:
            text_parts.append("\n### 相关事实:")
            for i, fact in enumerate(self.facts, 1):
                text_parts.append(f"{i}. {fact}")
        
        return "\n".join(text_parts)


@dataclass
class NodeInfo:
    """节点信息"""
    uuid: str
    name: str
    labels: List[str]
    summary: str
    attributes: Dict[str, Any]
    
    def to_dict(self) -> Dict[str, Any]:
        return {
            "uuid": self.uuid,
            "name": self.name,
            "labels": self.labels,
            "summary": self.summary,
            "attributes": self.attributes
        }
    
    def to_text(self) -> str:
        """转换为文本格式"""
        entity_type = next((l for l in self.labels if l not in ["Entity", "Node"]), "未知类型")
        return f"实体: {self.name} (类型: {entity_type})\n摘要: {self.summary}"


@dataclass
class EdgeInfo:
    """边信息"""
    uuid: str
    name: str
    fact: str
    source_node_uuid: str
    target_node_uuid: str
    source_node_name: Optional[str] = None
    target_node_name: Optional[str] = None
    
    def to_dict(self) -> Dict[str, Any]:
        return {
            "uuid": self.uuid,
            "name": self.name,
            "fact": self.fact,
            "source_node_uuid": self.source_node_uuid,
            "target_node_uuid": self.target_node_uuid,
            "source_node_name": self.source_node_name,
            "target_node_name": self.target_node_name
        }
    
    def to_text(self) -> str:
        """转换为文本格式"""
        source = self.source_node_name or self.source_node_uuid[:8]
        target = self.target_node_name or self.target_node_uuid[:8]
        return f"关系: {source} --[{self.name}]--> {target}\n事实: {self.fact}"


class ZepToolsService:
    """
    Zep检索工具服务
    
    提供多种图谱检索工具，可以被Report Agent调用：
    1. search_graph - 图谱语义搜索
    2. get_all_nodes - 获取图谱所有节点
    3. get_all_edges - 获取图谱所有边
    4. get_node_detail - 获取节点详细信息
    5. get_node_edges - 获取节点相关的边
    6. get_entities_by_type - 按类型获取实体
    7. get_entity_summary - 获取实体的关系摘要
    """
    
    # 重试配置
    MAX_RETRIES = 3
    RETRY_DELAY = 2.0
    
    def __init__(self, api_key: Optional[str] = None):
        self.api_key = api_key or Config.ZEP_API_KEY
        if not self.api_key:
            raise ValueError("ZEP_API_KEY 未配置")
        
        self.client = Zep(api_key=self.api_key)
        logger.info("ZepToolsService 初始化完成")
    
    def _call_with_retry(self, func, operation_name: str, max_retries: int = None):
        """带重试机制的API调用"""
        max_retries = max_retries or self.MAX_RETRIES
        last_exception = None
        delay = self.RETRY_DELAY
        
        for attempt in range(max_retries):
            try:
                return func()
            except Exception as e:
                last_exception = e
                if attempt < max_retries - 1:
                    logger.warning(
                        f"Zep {operation_name} 第 {attempt + 1} 次尝试失败: {str(e)[:100]}, "
                        f"{delay:.1f}秒后重试..."
                    )
                    time.sleep(delay)
                    delay *= 2
                else:
                    logger.error(f"Zep {operation_name} 在 {max_retries} 次尝试后仍失败: {str(e)}")
        
        raise last_exception
    
    def search_graph(
        self, 
        graph_id: str, 
        query: str, 
        limit: int = 10,
        scope: str = "edges"
    ) -> SearchResult:
        """
        图谱语义搜索
        
        使用混合搜索（语义+BM25）在图谱中搜索相关信息。
        如果Zep Cloud的search API不可用，则降级为本地关键词匹配。
        
        Args:
            graph_id: 图谱ID (Standalone Graph)
            query: 搜索查询
            limit: 返回结果数量
            scope: 搜索范围，"edges" 或 "nodes"
            
        Returns:
            SearchResult: 搜索结果
        """
        logger.info(f"图谱搜索: graph_id={graph_id}, query={query[:50]}...")
        
        # 尝试使用Zep Cloud Search API
        try:
            search_results = self._call_with_retry(
                func=lambda: self.client.graph.search(
                    graph_id=graph_id,
                    query=query,
                    limit=limit,
                    scope=scope,
                    reranker="cross_encoder"
                ),
                operation_name=f"图谱搜索(graph={graph_id})"
            )
            
            facts = []
            edges = []
            nodes = []
            
            # 解析边搜索结果
            if hasattr(search_results, 'edges') and search_results.edges:
                for edge in search_results.edges:
                    if hasattr(edge, 'fact') and edge.fact:
                        facts.append(edge.fact)
                    edges.append({
                        "uuid": getattr(edge, 'uuid_', None) or getattr(edge, 'uuid', ''),
                        "name": getattr(edge, 'name', ''),
                        "fact": getattr(edge, 'fact', ''),
                        "source_node_uuid": getattr(edge, 'source_node_uuid', ''),
                        "target_node_uuid": getattr(edge, 'target_node_uuid', ''),
                    })
            
            # 解析节点搜索结果
            if hasattr(search_results, 'nodes') and search_results.nodes:
                for node in search_results.nodes:
                    nodes.append({
                        "uuid": getattr(node, 'uuid_', None) or getattr(node, 'uuid', ''),
                        "name": getattr(node, 'name', ''),
                        "labels": getattr(node, 'labels', []),
                        "summary": getattr(node, 'summary', ''),
                    })
                    # 节点摘要也算作事实
                    if hasattr(node, 'summary') and node.summary:
                        facts.append(f"[{node.name}]: {node.summary}")
            
            logger.info(f"搜索完成: 找到 {len(facts)} 条相关事实")
            
            return SearchResult(
                facts=facts,
                edges=edges,
                nodes=nodes,
                query=query,
                total_count=len(facts)
            )
            
        except Exception as e:
            logger.warning(f"Zep Search API失败，降级为本地搜索: {str(e)}")
            # 降级：使用本地关键词匹配搜索
            return self._local_search(graph_id, query, limit, scope)
    
    def _local_search(
        self, 
        graph_id: str, 
        query: str, 
        limit: int = 10,
        scope: str = "edges"
    ) -> SearchResult:
        """
        本地关键词匹配搜索（作为Zep Search API的降级方案）
        
        获取所有边/节点，然后在本地进行关键词匹配
        
        Args:
            graph_id: 图谱ID
            query: 搜索查询
            limit: 返回结果数量
            scope: 搜索范围
            
        Returns:
            SearchResult: 搜索结果
        """
        logger.info(f"使用本地搜索: query={query[:30]}...")
        
        facts = []
        edges_result = []
        nodes_result = []
        
        # 提取查询关键词（简单分词）
        query_lower = query.lower()
        keywords = [w.strip() for w in query_lower.replace(',', ' ').replace('，', ' ').split() if len(w.strip()) > 1]
        
        def match_score(text: str) -> int:
            """计算文本与查询的匹配分数"""
            if not text:
                return 0
            text_lower = text.lower()
            # 完全匹配查询
            if query_lower in text_lower:
                return 100
            # 关键词匹配
            score = 0
            for keyword in keywords:
                if keyword in text_lower:
                    score += 10
            return score
        
        try:
            if scope in ["edges", "both"]:
                # 获取所有边并匹配
                all_edges = self.get_all_edges(graph_id)
                scored_edges = []
                for edge in all_edges:
                    score = match_score(edge.fact) + match_score(edge.name)
                    if score > 0:
                        scored_edges.append((score, edge))
                
                # 按分数排序
                scored_edges.sort(key=lambda x: x[0], reverse=True)
                
                for score, edge in scored_edges[:limit]:
                    if edge.fact:
                        facts.append(edge.fact)
                    edges_result.append({
                        "uuid": edge.uuid,
                        "name": edge.name,
                        "fact": edge.fact,
                        "source_node_uuid": edge.source_node_uuid,
                        "target_node_uuid": edge.target_node_uuid,
                    })
            
            if scope in ["nodes", "both"]:
                # 获取所有节点并匹配
                all_nodes = self.get_all_nodes(graph_id)
                scored_nodes = []
                for node in all_nodes:
                    score = match_score(node.name) + match_score(node.summary)
                    if score > 0:
                        scored_nodes.append((score, node))
                
                scored_nodes.sort(key=lambda x: x[0], reverse=True)
                
                for score, node in scored_nodes[:limit]:
                    nodes_result.append({
                        "uuid": node.uuid,
                        "name": node.name,
                        "labels": node.labels,
                        "summary": node.summary,
                    })
                    if node.summary:
                        facts.append(f"[{node.name}]: {node.summary}")
            
            logger.info(f"本地搜索完成: 找到 {len(facts)} 条相关事实")
            
        except Exception as e:
            logger.error(f"本地搜索失败: {str(e)}")
        
        return SearchResult(
            facts=facts,
            edges=edges_result,
            nodes=nodes_result,
            query=query,
            total_count=len(facts)
        )
    
    def get_all_nodes(self, graph_id: str) -> List[NodeInfo]:
        """
        获取图谱的所有节点
        
        Args:
            graph_id: 图谱ID
            
        Returns:
            节点列表
        """
        logger.info(f"获取图谱 {graph_id} 的所有节点...")
        
        nodes = self._call_with_retry(
            func=lambda: self.client.graph.node.get_by_graph_id(graph_id=graph_id),
            operation_name=f"获取节点(graph={graph_id})"
        )
        
        result = []
        for node in nodes:
            result.append(NodeInfo(
                uuid=getattr(node, 'uuid_', None) or getattr(node, 'uuid', ''),
                name=node.name or "",
                labels=node.labels or [],
                summary=node.summary or "",
                attributes=node.attributes or {}
            ))
        
        logger.info(f"获取到 {len(result)} 个节点")
        return result
    
    def get_all_edges(self, graph_id: str) -> List[EdgeInfo]:
        """
        获取图谱的所有边
        
        Args:
            graph_id: 图谱ID
            
        Returns:
            边列表
        """
        logger.info(f"获取图谱 {graph_id} 的所有边...")
        
        edges = self._call_with_retry(
            func=lambda: self.client.graph.edge.get_by_graph_id(graph_id=graph_id),
            operation_name=f"获取边(graph={graph_id})"
        )
        
        result = []
        for edge in edges:
            result.append(EdgeInfo(
                uuid=getattr(edge, 'uuid_', None) or getattr(edge, 'uuid', ''),
                name=edge.name or "",
                fact=edge.fact or "",
                source_node_uuid=edge.source_node_uuid or "",
                target_node_uuid=edge.target_node_uuid or ""
            ))
        
        logger.info(f"获取到 {len(result)} 条边")
        return result
    
    def get_node_detail(self, node_uuid: str) -> Optional[NodeInfo]:
        """
        获取单个节点的详细信息
        
        Args:
            node_uuid: 节点UUID
            
        Returns:
            节点信息或None
        """
        logger.info(f"获取节点详情: {node_uuid[:8]}...")
        
        try:
            node = self._call_with_retry(
                func=lambda: self.client.graph.node.get(uuid_=node_uuid),
                operation_name=f"获取节点详情(uuid={node_uuid[:8]}...)"
            )
            
            if not node:
                return None
            
            return NodeInfo(
                uuid=getattr(node, 'uuid_', None) or getattr(node, 'uuid', ''),
                name=node.name or "",
                labels=node.labels or [],
                summary=node.summary or "",
                attributes=node.attributes or {}
            )
        except Exception as e:
            logger.error(f"获取节点详情失败: {str(e)}")
            return None
    
    def get_node_edges(self, graph_id: str, node_uuid: str) -> List[EdgeInfo]:
        """
        获取节点相关的所有边
        
        通过获取图谱所有边，然后过滤出与指定节点相关的边
        
        Args:
            graph_id: 图谱ID
            node_uuid: 节点UUID
            
        Returns:
            边列表
        """
        logger.info(f"获取节点 {node_uuid[:8]}... 的相关边")
        
        try:
            # 获取图谱所有边，然后过滤
            all_edges = self.get_all_edges(graph_id)
            
            result = []
            for edge in all_edges:
                # 检查边是否与指定节点相关（作为源或目标）
                if edge.source_node_uuid == node_uuid or edge.target_node_uuid == node_uuid:
                    result.append(edge)
            
            logger.info(f"找到 {len(result)} 条与节点相关的边")
            return result
            
        except Exception as e:
            logger.warning(f"获取节点边失败: {str(e)}")
            return []
    
    def get_entities_by_type(
        self, 
        graph_id: str, 
        entity_type: str
    ) -> List[NodeInfo]:
        """
        按类型获取实体
        
        Args:
            graph_id: 图谱ID
            entity_type: 实体类型（如 Student, PublicFigure 等）
            
        Returns:
            符合类型的实体列表
        """
        logger.info(f"获取类型为 {entity_type} 的实体...")
        
        all_nodes = self.get_all_nodes(graph_id)
        
        filtered = []
        for node in all_nodes:
            # 检查labels是否包含指定类型
            if entity_type in node.labels:
                filtered.append(node)
        
        logger.info(f"找到 {len(filtered)} 个 {entity_type} 类型的实体")
        return filtered
    
    def get_entity_summary(
        self, 
        graph_id: str, 
        entity_name: str
    ) -> Dict[str, Any]:
        """
        获取指定实体的关系摘要
        
        搜索与该实体相关的所有信息，并生成摘要
        
        Args:
            graph_id: 图谱ID
            entity_name: 实体名称
            
        Returns:
            实体摘要信息
        """
        logger.info(f"获取实体 {entity_name} 的关系摘要...")
        
        # 先搜索该实体相关的信息
        search_result = self.search_graph(
            graph_id=graph_id,
            query=entity_name,
            limit=20
        )
        
        # 尝试在所有节点中找到该实体
        all_nodes = self.get_all_nodes(graph_id)
        entity_node = None
        for node in all_nodes:
            if node.name.lower() == entity_name.lower():
                entity_node = node
                break
        
        related_edges = []
        if entity_node:
            # 传入graph_id参数
            related_edges = self.get_node_edges(graph_id, entity_node.uuid)
        
        return {
            "entity_name": entity_name,
            "entity_info": entity_node.to_dict() if entity_node else None,
            "related_facts": search_result.facts,
            "related_edges": [e.to_dict() for e in related_edges],
            "total_relations": len(related_edges)
        }
    
    def get_graph_statistics(self, graph_id: str) -> Dict[str, Any]:
        """
        获取图谱的统计信息
        
        Args:
            graph_id: 图谱ID
            
        Returns:
            统计信息
        """
        logger.info(f"获取图谱 {graph_id} 的统计信息...")
        
        nodes = self.get_all_nodes(graph_id)
        edges = self.get_all_edges(graph_id)
        
        # 统计实体类型分布
        entity_types = {}
        for node in nodes:
            for label in node.labels:
                if label not in ["Entity", "Node"]:
                    entity_types[label] = entity_types.get(label, 0) + 1
        
        # 统计关系类型分布
        relation_types = {}
        for edge in edges:
            relation_types[edge.name] = relation_types.get(edge.name, 0) + 1
        
        return {
            "graph_id": graph_id,
            "total_nodes": len(nodes),
            "total_edges": len(edges),
            "entity_types": entity_types,
            "relation_types": relation_types
        }
    
    def get_simulation_context(
        self, 
        graph_id: str,
        simulation_requirement: str,
        limit: int = 30
    ) -> Dict[str, Any]:
        """
        获取模拟相关的上下文信息
        
        综合搜索与模拟需求相关的所有信息
        
        Args:
            graph_id: 图谱ID
            simulation_requirement: 模拟需求描述
            limit: 每类信息的数量限制
            
        Returns:
            模拟上下文信息
        """
        logger.info(f"获取模拟上下文: {simulation_requirement[:50]}...")
        
        # 搜索与模拟需求相关的信息
        search_result = self.search_graph(
            graph_id=graph_id,
            query=simulation_requirement,
            limit=limit
        )
        
        # 获取图谱统计
        stats = self.get_graph_statistics(graph_id)
        
        # 获取所有实体节点
        all_nodes = self.get_all_nodes(graph_id)
        
        # 筛选有实际类型的实体（非纯Entity节点）
        entities = []
        for node in all_nodes:
            custom_labels = [l for l in node.labels if l not in ["Entity", "Node"]]
            if custom_labels:
                entities.append({
                    "name": node.name,
                    "type": custom_labels[0],
                    "summary": node.summary
                })
        
        return {
            "simulation_requirement": simulation_requirement,
            "related_facts": search_result.facts,
            "graph_statistics": stats,
            "entities": entities[:limit],  # 限制数量
            "total_entities": len(entities)
        }