import json
import os
import re
import uuid
from datetime import datetime
from typing import Any

from yuxi import config
from yuxi.knowledge import knowledge_base
from yuxi.models import select_model
from yuxi.repositories.evaluation_repository import EvaluationRepository
from yuxi.repositories.knowledge_base_repository import KnowledgeBaseRepository
from yuxi.services.task_service import TaskContext, tasker
from yuxi.utils import logger
from yuxi.utils.evaluation_metrics import EvaluationMetricsCalculator


class EvaluationService:
    """RAG评估服务"""

    def __init__(self):
        self.eval_repo = EvaluationRepository()
        self.kb_repo = KnowledgeBaseRepository()

    async def _get_benchmark_dir(self, db_id: str) -> str:
        """获取评估基准目录"""
        kb_instance = await knowledge_base.aget_kb(db_id)
        base_dir = os.path.join(kb_instance.work_dir, db_id)
        path = os.path.join(base_dir, "benchmarks")
        os.makedirs(path, exist_ok=True)
        return path

    async def _get_result_dir(self, db_id: str) -> str:
        """获取评估结果目录"""
        kb_instance = await knowledge_base.aget_kb(db_id)
        base_dir = os.path.join(kb_instance.work_dir, db_id)
        path = os.path.join(base_dir, "results")
        os.makedirs(path, exist_ok=True)
        return path

    # 已移除基准回退逻辑，统一使用集中元数据

    # 已移除结果回退逻辑，统一通过 db_id 定位

    async def upload_benchmark(
        self, db_id: str, file_content: bytes, filename: str, name: str, description: str, created_by: str
    ) -> dict[str, Any]:
        """上传评估基准文件"""
        try:
            content_str = file_content.decode("utf-8")
            questions = []
            has_gold_chunks = False
            has_gold_answers = False

            # 解析 JSONL
            for line_num, line in enumerate(content_str.strip().split("\n"), 1):
                if not line.strip():
                    continue
                try:
                    item = json.loads(line)
                    if "query" not in item:
                        raise ValueError(f"第{line_num}行缺少必需的'query'字段")
                    if item.get("gold_chunk_ids"):
                        has_gold_chunks = True
                    if item.get("gold_answer"):
                        has_gold_answers = True
                    questions.append(item)
                except json.JSONDecodeError as e:
                    raise ValueError(f"第{line_num}行JSON格式错误: {str(e)}")

            if not questions:
                raise ValueError("文件中没有有效的问题数据")

            benchmark_id = f"benchmark_{uuid.uuid4().hex[:8]}"
            benchmark_dir = await self._get_benchmark_dir(db_id)

            # 保存数据文件 (.jsonl)
            data_file_path = os.path.join(benchmark_dir, f"{benchmark_id}.jsonl")
            with open(data_file_path, "w", encoding="utf-8") as f:
                f.write(content_str)

            meta = {
                "id": benchmark_id,
                "benchmark_id": benchmark_id,
                "name": name,
                "description": description,
                "db_id": db_id,
                "question_count": len(questions),
                "has_gold_chunks": has_gold_chunks,
                "has_gold_answers": has_gold_answers,
                "benchmark_file": data_file_path,
                "created_by": created_by,
                "created_at": datetime.utcnow().isoformat(),
                "updated_at": datetime.utcnow().isoformat(),
            }
            await self.eval_repo.create_benchmark(
                {
                    "benchmark_id": benchmark_id,
                    "db_id": db_id,
                    "name": name,
                    "description": description,
                    "question_count": len(questions),
                    "has_gold_chunks": has_gold_chunks,
                    "has_gold_answers": has_gold_answers,
                    "data_file_path": data_file_path,
                    "created_by": created_by,
                }
            )
            return meta

        except Exception as e:
            logger.error(f"上传评估基准失败: {e}")
            raise

    async def get_benchmarks(self, db_id: str) -> list[dict[str, Any]]:
        """获取知识库的评估基准列表"""
        try:
            rows = await self.eval_repo.list_benchmarks(db_id)
            return [
                {
                    "id": row.benchmark_id,
                    "benchmark_id": row.benchmark_id,
                    "name": row.name,
                    "description": row.description,
                    "db_id": row.db_id,
                    "question_count": row.question_count,
                    "has_gold_chunks": row.has_gold_chunks,
                    "has_gold_answers": row.has_gold_answers,
                    "benchmark_file": row.data_file_path,
                    "created_by": row.created_by,
                    "created_at": row.created_at.isoformat() if row.created_at else None,
                    "updated_at": row.updated_at.isoformat() if row.updated_at else None,
                }
                for row in rows
            ]

        except Exception as e:
            logger.error(f"获取评估基准列表失败: {e}")
            raise

    async def get_benchmark_detail(self, benchmark_id: str) -> dict[str, Any]:
        """获取评估基准详情 (包含问题列表)"""
        try:
            row = await self.eval_repo.get_benchmark(benchmark_id)
            if row is None:
                raise ValueError("Benchmark not found")
            questions = []
            if row.data_file_path and os.path.exists(row.data_file_path):
                with open(row.data_file_path, encoding="utf-8") as f:
                    for line in f:
                        if line.strip():
                            questions.append(json.loads(line))
            return {
                "id": row.benchmark_id,
                "benchmark_id": row.benchmark_id,
                "name": row.name,
                "description": row.description,
                "db_id": row.db_id,
                "question_count": row.question_count,
                "has_gold_chunks": row.has_gold_chunks,
                "has_gold_answers": row.has_gold_answers,
                "benchmark_file": row.data_file_path,
                "created_by": row.created_by,
                "created_at": row.created_at.isoformat() if row.created_at else None,
                "updated_at": row.updated_at.isoformat() if row.updated_at else None,
                "questions": questions,
            }

        except Exception as e:
            logger.error(f"获取评估基准详情失败: {e}")
            raise

    async def get_benchmark_detail_by_db(
        self, db_id: str, benchmark_id: str, page: int = 1, page_size: int = 10
    ) -> dict[str, Any]:
        """根据 db_id 获取评估基准详情（支持分页）"""
        try:
            row = await self.eval_repo.get_benchmark(benchmark_id)
            if row is None or row.db_id != db_id:
                raise ValueError("Benchmark not found")
            data_file_path = row.data_file_path
            total_questions = row.question_count or 0
            questions = []

            if data_file_path and os.path.exists(data_file_path):
                # 计算分页范围
                start_index = (page - 1) * page_size
                end_index = start_index + page_size

                # 读取指定范围的问题
                with open(data_file_path, encoding="utf-8") as f:
                    current_index = 0
                    for line in f:
                        if not line.strip():
                            continue

                        # 只处理指定范围内的问题
                        if current_index >= start_index and current_index < end_index:
                            questions.append(json.loads(line))
                        elif current_index >= end_index:
                            break  # 已经读取到足够的问题，停止读取

                        current_index += 1

            # 计算分页信息
            total_pages = (total_questions + page_size - 1) // page_size

            return {
                "id": row.benchmark_id,
                "benchmark_id": row.benchmark_id,
                "name": row.name,
                "description": row.description,
                "db_id": row.db_id,
                "question_count": row.question_count,
                "has_gold_chunks": row.has_gold_chunks,
                "has_gold_answers": row.has_gold_answers,
                "benchmark_file": data_file_path,
                "created_by": row.created_by,
                "created_at": row.created_at.isoformat() if row.created_at else None,
                "updated_at": row.updated_at.isoformat() if row.updated_at else None,
                "questions": questions,
                "pagination": {
                    "current_page": page,
                    "page_size": page_size,
                    "total_questions": total_questions,
                    "total_pages": total_pages,
                    "has_next": page < total_pages,
                    "has_prev": page > 1,
                },
            }
        except Exception as e:
            logger.error(f"获取评估基准详情失败: {e}")
            raise

    async def get_benchmark_download_info(self, benchmark_id: str) -> dict[str, str]:
        """获取评估基准下载信息"""
        row = await self.eval_repo.get_benchmark(benchmark_id)
        if row is None:
            raise ValueError("Benchmark not found")

        data_file_path = row.data_file_path or ""
        if not data_file_path or not os.path.exists(data_file_path):
            raise ValueError("Benchmark file not found")

        filename_base = (row.name or "").strip()
        if not filename_base:
            filename_base = row.benchmark_id

        filename_base = re.sub(r"[\\/:*?\"<>|]+", "_", filename_base).strip()
        if not filename_base or filename_base in {".", ".."}:
            filename_base = row.benchmark_id

        if not filename_base.endswith(".jsonl"):
            filename_base = f"{filename_base}.jsonl"

        return {"file_path": data_file_path, "filename": filename_base}

    async def delete_benchmark(self, benchmark_id: str) -> None:
        """删除评估基准"""
        try:
            row = await self.eval_repo.get_benchmark(benchmark_id)
            if row is None:
                raise ValueError("Benchmark not found")
            if row.data_file_path and os.path.exists(row.data_file_path):
                os.remove(row.data_file_path)
            await self.eval_repo.delete_benchmark(benchmark_id)
            logger.info(f"成功删除评估基准: {benchmark_id}")
            return

        except Exception as e:
            logger.error(f"删除评估基准失败: {e}")
            raise

    async def delete_evaluation_result(self, task_id: str, db_id: str) -> None:
        """删除评估结果"""
        if not task_id:
            raise ValueError("task_id is required")
        await self.delete_evaluation_result_by_db(db_id, task_id)

    async def generate_benchmark(self, db_id: str, params: dict[str, Any], created_by: str) -> dict[str, Any]:
        task_id = f"gen_benchmark_{uuid.uuid4().hex[:8]}"
        await tasker.enqueue(
            name="生成评估基准",
            task_type="benchmark_generation",
            payload={"task_id": task_id, "db_id": db_id, "created_by": created_by, **params},
            coroutine=self._generate_benchmark_task,
        )
        return {"task_id": task_id, "message": "基准生成任务已提交"}

    async def _generate_benchmark_task(self, context: TaskContext):
        import math
        import random

        await context.set_progress(0, "初始化")

        task = context._tasker._tasks.get(context.task_id)
        payload = task.payload if task else {}

        db_id = payload.get("db_id")
        name = payload.get("name", "自动生成评估基准")
        description = payload.get("description", "")
        count = int(payload.get("count", 10))
        neighbors_count = int(payload.get("neighbors_count", 0))
        embedding_model_id = payload.get("embedding_model_id")
        llm_model_spec = payload.get("llm_model_spec") or (payload.get("llm_config") or {}).get("model_spec")

        if neighbors_count < 0:
            neighbors_count = 0
        if neighbors_count > 10:
            neighbors_count = 10

        kb_instance = await knowledge_base.aget_kb(db_id)
        if not kb_instance:
            await context.set_message("知识库不存在")
            raise ValueError("Knowledge Base not found")
        if kb_instance.kb_type == "lightrag":
            await context.set_message("暂不支持该类型知识库生成评估基准")
            raise ValueError("Unsupported KB type for benchmark generation")

        await context.set_progress(5, "加载chunks")

        all_chunks = []
        for fid, finfo in kb_instance.files_meta.items():
            if finfo.get("database_id") != db_id:
                continue
            try:
                content_info = await kb_instance.get_file_content(db_id, fid)
                lines = content_info.get("lines", [])
                for line in lines:
                    all_chunks.append(
                        {
                            "id": line.get("id"),
                            "content": line.get("content", ""),
                            "file_id": fid,
                            "chunk_index": line.get("chunk_order_index"),
                        }
                    )
            except Exception:
                continue

        if not all_chunks:
            await context.set_message("知识库为空或未解析到chunks")
            raise ValueError("No chunks found in knowledge base")

        contents = [c["content"] for c in all_chunks]

        await context.set_progress(15, "向量化")

        db_meta = kb_instance.databases_meta.get(db_id, {})
        embed_info = db_meta.get("embed_info", {})
        if not embedding_model_id:
            embedding_model_id = embed_info.get("name") or embed_info.get("model") or ""
        if not embedding_model_id:
            raise ValueError("Embedding model not specified")

        from yuxi.models import select_embedding_model, select_model

        embed_model = select_embedding_model(embedding_model_id)
        batch_size = int(getattr(embed_model, "batch_size", 40) or 40)
        if embedding_model_id in config.embed_model_names:
            batch_size = config.embed_model_names[embedding_model_id].batch_size
        # TODO: Performance Optimization
        # Currently, we re-calculate embeddings for ALL chunks in the KB for every benchmark generation.
        # This is inefficient for large KBs (O(N) embedding calls).
        # Optimization: Reuse existing embeddings from Vector DB if embedding_model_id matches the KB's embedding model.
        embeddings = await embed_model.abatch_encode(contents, batch_size=batch_size)
        norms = [math.sqrt(sum(x * x for x in vec)) or 1.0 for vec in embeddings]

        def cosine(a, b, na, nb):
            s = 0.0
            for i in range(len(a)):
                s += a[i] * b[i]
            return s / (na * nb)

        llm = select_model(model_spec=llm_model_spec)

        benchmark_id = f"benchmark_{uuid.uuid4().hex[:8]}"
        bench_dir = await self._get_benchmark_dir(db_id)
        data_file_path = os.path.join(bench_dir, f"{benchmark_id}.jsonl")

        generated = 0
        attempts = 0

        await context.set_progress(0, "准备生成样本")

        with open(data_file_path, "w", encoding="utf-8") as f:
            # Allow more attempts to generate enough questions
            max_attempts = max(count * 5, 50)
            while generated < count and attempts < max_attempts:
                attempts += 1
                i0 = random.randrange(len(all_chunks))
                e0 = embeddings[i0]
                n0 = norms[i0]

                sims = []
                for j in range(len(all_chunks)):
                    if j == i0:
                        continue
                    s = cosine(e0, embeddings[j], n0, norms[j])
                    sims.append((j, s))
                sims.sort(key=lambda x: x[1], reverse=True)
                top_js = [j for j, _ in sims[:neighbors_count]]

                ctx_items = []
                ctx_items.append((all_chunks[i0]["id"], all_chunks[i0]["content"]))
                for j in top_js:
                    ctx_items.append((all_chunks[j]["id"], all_chunks[j]["content"]))
                allowed_ids = {cid for cid, _ in ctx_items}
                context_text = "\n\n".join([f"片段ID={cid}\n{content}" for cid, content in ctx_items])

                prompt = (
                    "你将基于以下上下文生成一个可由上下文准确回答的问题与标准答案。"
                    "仅返回一个JSON对象，不要包含其他文字。"
                    "键为 query、gold_answer、gold_chunk_ids。gold_chunk_ids 必须是上述上下文片段的ID子集。\n\n"
                    "上下文：\n" + context_text + "\n"
                )

                try:
                    resp = await llm.call(prompt, False)
                    content = resp.content if resp else ""

                    import json_repair

                    obj = json_repair.loads(content)
                    q = obj.get("query")
                    a = obj.get("gold_answer")
                    gids = obj.get("gold_chunk_ids")
                    if not q or not a or not isinstance(gids, list):
                        logger.warning(f"Generated JSON missing fields or invalid format: {obj}")
                        continue

                    gids = [str(x) for x in gids if str(x) in allowed_ids]
                    if not gids:
                        logger.warning("Generated gold_chunk_ids not found in allowed context")
                        continue

                    line = {"query": q, "gold_chunk_ids": gids, "gold_answer": a}
                    f.write(json.dumps(line, ensure_ascii=False) + "\n")
                    generated += 1
                    await context.set_progress(0 + int(99 * generated / max(count, 1)), f"已生成 {generated}/{count}")
                except Exception as e:
                    logger.warning(f"Benchmark generation failed for one item: {e}")
                    continue

        await self.eval_repo.create_benchmark(
            {
                "benchmark_id": benchmark_id,
                "db_id": db_id,
                "name": name,
                "description": description,
                "question_count": generated,
                "has_gold_chunks": True,
                "has_gold_answers": True,
                "data_file_path": data_file_path,
                "created_by": payload.get("created_by"),
            }
        )

        await context.set_progress(100, "完成")

    async def run_evaluation(
        self, db_id: str, benchmark_id: str, model_config: dict[str, Any] = None, created_by: str = "system"
    ) -> str:
        """运行RAG评估"""
        try:
            task_id = f"eval_{uuid.uuid4().hex[:8]}"

            benchmark_row = await self.eval_repo.get_benchmark(benchmark_id)
            if benchmark_row is None or benchmark_row.db_id != db_id:
                raise ValueError("Benchmark not found")

            # 从知识库元数据中获取检索配置
            retrieval_config = {}
            try:
                kb_row = await self.kb_repo.get_by_id(db_id)
                query_params = (kb_row.query_params if kb_row else None) or {}
                retrieval_config = query_params.get("options", {}) if isinstance(query_params, dict) else {}
                logger.info(f"从知识库 {db_id} 加载检索配置: {list(retrieval_config.keys())}")
            except Exception as e:
                logger.error(f"获取知识库检索配置失败: {e}")
                # 使用空配置作为默认值

            # 合并前端传递的模型配置
            if model_config:
                retrieval_config.update(model_config)

            await self.eval_repo.create_result(
                {
                    "task_id": task_id,
                    "db_id": db_id,
                    "benchmark_id": benchmark_id,
                    "status": "running",
                    "retrieval_config": retrieval_config,
                    "metrics": {},
                    "overall_score": None,
                    "total_questions": benchmark_row.question_count or 0,
                    "completed_questions": 0,
                    "started_at": datetime.utcnow(),
                    "completed_at": None,
                    "created_by": created_by,
                }
            )

            await tasker.enqueue(
                name=f"RAG评估({benchmark_row.name})",
                task_type="rag_evaluation",
                payload={
                    "task_id": task_id,
                    "db_id": db_id,
                    "benchmark_id": benchmark_id,
                    "retrieval_config": retrieval_config,
                    "created_by": created_by,
                },
                coroutine=self._run_evaluation_task,
            )

            return task_id

        except Exception as e:
            logger.error(f"启动评估失败: {e}")
            raise

    async def _run_evaluation_task(self, context: TaskContext):
        """运行评估任务"""
        try:
            task = context._tasker._tasks.get(context.task_id)
            if not task:
                raise ValueError("Task not found")
            payload = task.payload

            task_id = payload["task_id"]
            db_id = payload["db_id"]
            benchmark_id = payload["benchmark_id"]
            retrieval_config = payload["retrieval_config"]

            # 加载基准数据
            await context.set_progress(5, "加载基准数据")
            benchmark_row = await self.eval_repo.get_benchmark(benchmark_id)
            if benchmark_row is None or benchmark_row.db_id != db_id:
                raise ValueError("Benchmark not found")
            data_path = benchmark_row.data_file_path
            if not data_path or not os.path.exists(data_path):
                raise ValueError("Benchmark file not found")

            benchmark_data = []
            with open(data_path, encoding="utf-8") as f:
                for line in f:
                    if line.strip():
                        benchmark_data.append(json.loads(line))

            # 开始评估
            kb_instance = await knowledge_base.aget_kb(db_id)
            if not kb_instance:
                raise ValueError(f"Knowledge Base {db_id} not found")

            if kb_instance.kb_type == "lightrag":
                raise ValueError("暂不支持对 LightRAG 类型的知识库进行 RAG 评估")

            # 初始化 Judge LLM
            judge_llm = None
            if benchmark_row.has_gold_answers:
                # 优先使用配置中的 judge_llm，否则回退到 answer_llm，或者默认
                judge_model_spec = retrieval_config.get("judge_llm") or retrieval_config.get("answer_llm")
                if judge_model_spec:
                    try:
                        logger.debug(f"Initializing Judge LLM: {judge_model_spec}")
                        judge_llm = select_model(model_spec=judge_model_spec)
                    except Exception as e:
                        logger.error(f"Failed to load judge LLM: {e}")

            total_questions = len(benchmark_data)
            all_retrieval_metrics = []
            all_answer_metrics = []

            async def update_result_db(
                status: str | None = None, completed: int | None = None, metrics=None, final_score=None
            ):
                payload = {}
                if status is not None:
                    payload["status"] = status
                    if status in ["completed", "failed"]:
                        payload["completed_at"] = datetime.utcnow()
                if completed is not None:
                    payload["completed_questions"] = completed
                if metrics is not None:
                    payload["metrics"] = metrics
                if final_score is not None:
                    payload["overall_score"] = final_score
                if payload:
                    await self.eval_repo.update_result(task_id, payload)

            for i, question_data in enumerate(benchmark_data):
                # 检查任务是否被取消
                await context.raise_if_cancelled()
                progress = 10 + (i / total_questions) * 80
                await context.set_progress(progress, f"评估 {i + 1}/{total_questions}")

                # 执行查询
                query_result = await kb_instance.aquery(question_data["query"], db_id, **retrieval_config)

                # 处理结果
                if isinstance(query_result, dict):
                    generated_answer = query_result.get("answer", "")
                    retrieved_chunks = query_result.get("retrieved_chunks", [])
                else:
                    retrieved_chunks = query_result if isinstance(query_result, list) else []
                    generated_answer = ""

                # 如果没有生成的答案，但有检索结果且配置了 LLM，则生成答案
                if not generated_answer and retrieved_chunks and retrieval_config.get("answer_llm"):
                    logger.debug(f"使用 LLM {retrieval_config.get('answer_llm')} 生成答案...")
                    try:
                        # 从配置中获取 LLM
                        model_spec = retrieval_config["answer_llm"]
                        llm = select_model(model_spec=model_spec)

                        # 构建上下文
                        context_docs = []
                        for idx, chunk in enumerate(retrieved_chunks[:5]):  # 使用前5个最相关的文档
                            content = chunk.get("content", "")
                            if content:
                                context_docs.append(f"文档 {idx + 1}:\n{content}")

                        context_text = "\\n\\n".join(context_docs)

                        # 构建提示词
                        prompt = (
                            f"基于以下上下文信息，请回答用户的问题。\n\n"
                            f"上下文信息：{context_text}\n\n"
                            f"用户问题：{question_data['query']}\n\n"
                            "请根据上下文信息准确回答问题。\n\n"
                            "如果上下文中缺少相关信息，请回答“信息不足，无法回答”。\n\n"
                        )

                        # 生成答案
                        response = await llm.call(prompt, stream=False)
                        generated_answer = response.content if response else ""
                        logger.debug(f"LLM 生成的答案长度: {len(generated_answer) if generated_answer else 0}")

                    except Exception as e:
                        logger.error(f"LLM 生成答案失败: {e}")
                        generated_answer = ""

                # 计算指标
                current_metrics = {}
                retrieval_scores = {}
                answer_scores = {}

                if benchmark_row.has_gold_chunks and question_data.get("gold_chunk_ids"):
                    retrieval_scores = EvaluationMetricsCalculator.calculate_retrieval_metrics(
                        retrieved_chunks, question_data["gold_chunk_ids"]
                    )
                    current_metrics.update(retrieval_scores)
                    all_retrieval_metrics.append(retrieval_scores)

                if benchmark_row.has_gold_answers and question_data.get("gold_answer"):
                    if judge_llm:
                        # 评判过程包含 LLM 调用
                        answer_scores = await EvaluationMetricsCalculator.calculate_answer_metrics(
                            query=question_data["query"],
                            generated_answer=generated_answer,
                            gold_answer=question_data["gold_answer"],
                            judge_llm=judge_llm,
                        )
                        current_metrics.update(answer_scores)
                        all_answer_metrics.append(answer_scores)
                    else:
                        logger.warning("需要计算答案指标但未配置 Judge LLM")

                await self.eval_repo.upsert_result_detail(
                    task_id=task_id,
                    query_index=i,
                    data={
                        "query_text": question_data["query"],
                        "gold_chunk_ids": question_data.get("gold_chunk_ids"),
                        "gold_answer": question_data.get("gold_answer"),
                        "generated_answer": generated_answer,
                        "retrieved_chunks": retrieved_chunks,
                        "metrics": current_metrics,
                    },
                )

                # 计算当前累计指标
                current_overall_metrics = {}
                if all_retrieval_metrics:
                    keys = all_retrieval_metrics[0].keys()
                    for k in keys:
                        current_overall_metrics[k] = sum(m.get(k, 0) for m in all_retrieval_metrics) / len(
                            all_retrieval_metrics
                        )
                if all_answer_metrics:
                    scores = [m.get("score", 0) for m in all_answer_metrics]
                    current_overall_metrics["answer_correctness"] = sum(scores) / len(scores) if scores else 0.0

                # 更新 Tasker 的 result 以便实时获取当前指标
                await context.set_result(
                    {
                        "current_metrics": current_overall_metrics,
                        "completed_questions": i + 1,
                        "total_questions": total_questions,
                    }
                )

                # 定期更新文件 (每5个或最后一个)
                if (i + 1) % 5 == 0 or (i + 1) == total_questions:
                    await update_result_db(completed=i + 1)

            # 最终计算
            await context.set_progress(95, "计算最终指标")

            # 汇总指标
            overall_metrics = {}

            # 检索指标平均值
            if all_retrieval_metrics:
                keys = all_retrieval_metrics[0].keys()
                for k in keys:
                    overall_metrics[k] = sum(m.get(k, 0) for m in all_retrieval_metrics) / len(all_retrieval_metrics)

            # 答案指标平均值
            if all_answer_metrics:
                scores = [m.get("score", 0) for m in all_answer_metrics]
                overall_metrics["answer_correctness"] = sum(scores) / len(scores) if scores else 0.0

            overall_score = EvaluationMetricsCalculator.calculate_overall_score(
                all_retrieval_metrics, all_answer_metrics
            )
            overall_metrics["overall_score"] = overall_score

            await update_result_db(
                status="completed",
                completed=total_questions,
                metrics=overall_metrics,
                final_score=overall_score,
            )
            await context.set_progress(100, "完成")

        except Exception as e:
            logger.error(f"Task failed: {e}")
            try:
                if "payload" in locals():
                    await self.eval_repo.update_result(
                        payload["task_id"],
                        {"status": "failed", "metrics": {"error": str(e)}, "completed_at": datetime.utcnow()},
                    )
            except Exception as exc:
                logger.error(f"Error updating result record: {exc}")

            await context.set_message(f"Error: {str(e)}")
            raise

    async def get_evaluation_results(self, task_id: str, db_id: str) -> dict[str, Any]:
        """获取评估结果"""
        if not task_id:
            raise ValueError("task_id is required")
        return await self.get_evaluation_results_by_db(db_id, task_id)

    async def get_evaluation_history(self, db_id: str) -> list[dict[str, Any]]:
        """获取知识库的评估历史记录"""
        try:
            rows = await self.eval_repo.list_results(db_id)
            return [
                {
                    "task_id": row.task_id,
                    "benchmark_id": row.benchmark_id,
                    "status": row.status,
                    "started_at": row.started_at.isoformat() if row.started_at else None,
                    "completed_at": row.completed_at.isoformat() if row.completed_at else None,
                    "total_questions": row.total_questions,
                    "completed_questions": row.completed_questions,
                    "overall_score": row.overall_score,
                    "retrieval_config": row.retrieval_config or {},
                    "metrics": row.metrics or {},
                }
                for row in rows
            ]

        except Exception as e:
            logger.error(f"获取评估历史失败: {e}")
            raise
        # 索引与回退逻辑已移除，统一通过 db_id 定位

    async def get_evaluation_results_by_db(
        self, db_id: str, task_id: str, page: int = 1, page_size: int = 20, error_only: bool = False
    ) -> dict[str, Any]:
        if not re.match(r"^eval_[a-f0-9]{8}$", task_id):
            raise ValueError("Invalid task_id format")
        row = await self.eval_repo.get_result(task_id)
        if row is None or row.db_id != db_id:
            task = await tasker.get_task(task_id)
            if task:
                return {"task_id": task_id, "status": task.status, "progress": task.progress, "message": task.message}
            raise ValueError(f"Result not found for task {task_id}")

        details = await self.eval_repo.list_result_details(task_id)
        all_results = [
            {
                "query": d.query_text,
                "gold_chunk_ids": d.gold_chunk_ids,
                "gold_answer": d.gold_answer,
                "generated_answer": d.generated_answer,
                "retrieved_chunks": d.retrieved_chunks,
                "metrics": d.metrics or {},
            }
            for d in details
        ]

        if error_only:
            filtered_results = []
            for item in all_results:
                if item.get("metrics", {}).get("score", 1.0) <= 0.5:
                    filtered_results.append(item)
                    continue
                metrics = item.get("metrics", {})
                has_low_recall = any(metrics.get(k, 1.0) < 0.3 for k in metrics if k.startswith("recall@"))
                if has_low_recall:
                    filtered_results.append(item)
            all_results = filtered_results

        total = len(all_results)
        start_idx = (page - 1) * page_size
        end_idx = start_idx + page_size
        paged_results = all_results[start_idx:end_idx]

        return {
            "task_id": row.task_id,
            "status": row.status,
            "started_at": row.started_at.isoformat() if row.started_at else None,
            "completed_at": row.completed_at.isoformat() if row.completed_at else None,
            "total_questions": row.total_questions or 0,
            "completed_questions": row.completed_questions or 0,
            "overall_score": row.overall_score,
            "retrieval_config": row.retrieval_config or {},
            "interim_results": paged_results,
            "pagination": {
                "current_page": page,
                "page_size": page_size,
                "total": total,
                "total_pages": (total + page_size - 1) // page_size,
                "error_only": error_only,
            },
        }

    async def delete_evaluation_result_by_db(self, db_id: str, task_id: str) -> None:
        if not re.match(r"^eval_[a-f0-9]{8}$", task_id):
            raise ValueError("Invalid task_id format")
        row = await self.eval_repo.get_result(task_id)
        if row is None or row.db_id != db_id:
            raise ValueError("Result not found")
        await self.eval_repo.delete_result(task_id)
        logger.info(f"成功删除评估结果: {task_id}")
        return
