#!/usr/bin/env python
"""
知识库迁移脚本: SQLite -> Milvus
从旧的 SQLite 数据库迁移知识数据到新的 Milvus 向量数据库
"""

import sys
import json
import sqlite3
import asyncio
from pathlib import Path
from datetime import datetime

# 添加项目路径
sys.path.insert(0, str(Path(__file__).parent))

from knowhub.vector_store import MilvusStore
from knowhub.embeddings import get_embeddings_batch


async def migrate_knowledge():
    """迁移知识数据"""

    # 源数据库路径
    source_db = Path("/root/knowhub_backup_20260309_204451.db")
    if not source_db.exists():
        print(f"❌ 源数据库不存在: {source_db}")
        return

    # 目标 Milvus 存储
    milvus_data_dir = Path(__file__).parent / "knowhub/milvus_data"
    target_store = MilvusStore(str(milvus_data_dir))

    print(f"📂 源数据库: {source_db}")
    print(f"📂 目标 Milvus: {milvus_data_dir}")
    print(f"📊 当前 Milvus 中的知识数量: {target_store.count()}")

    # 读取源数据
    print("\n📖 正在读取源数据...")
    conn = sqlite3.connect(str(source_db))
    conn.row_factory = sqlite3.Row
    cursor = conn.cursor()

    cursor.execute("SELECT * FROM knowledge ORDER BY created_at")
    rows = cursor.fetchall()
    conn.close()

    print(f"✅ 读取到 {len(rows)} 条知识数据")

    if len(rows) == 0:
        print("⚠️  没有数据需要迁移")
        return

    # 显示迁移信息
    print(f"\n⚠️  即将迁移 {len(rows)} 条知识到 Milvus")
    print(f"   当前 Milvus 中已有 {target_store.count()} 条知识")
    print("   开始迁移...")

    # 转换数据格式
    print("\n🔄 正在转换数据格式...")
    knowledge_list = []
    tasks = []  # 用于批量生成 embedding

    for row in rows:
        try:
            # 解析 JSON 字段
            types = json.loads(row['types']) if row['types'] else ["strategy"]
            tags = json.loads(row['tags']) if row['tags'] else {}
            scopes = json.loads(row['scopes']) if row['scopes'] else ["org:cybertogether"]
            source = json.loads(row['source']) if row['source'] else {}
            eval_data = json.loads(row['eval']) if row['eval'] else {
                "score": 3, "helpful": 1, "harmful": 0, "confidence": 0.5,
                "helpful_history": [], "harmful_history": []
            }
            resource_ids = json.loads(row['resource_ids']) if row['resource_ids'] else []

            # 解析时间戳
            created_at = row['created_at']
            updated_at = row['updated_at'] if row['updated_at'] else created_at

            # 转换为时间戳（如果是 ISO 格式字符串）
            if isinstance(created_at, str):
                try:
                    created_at = int(datetime.fromisoformat(created_at.replace('Z', '+00:00')).timestamp())
                except:
                    created_at = int(datetime.now().timestamp())

            if isinstance(updated_at, str):
                try:
                    updated_at = int(datetime.fromisoformat(updated_at.replace('Z', '+00:00')).timestamp())
                except:
                    updated_at = created_at

            knowledge_list.append({
                "id": row['id'],
                "message_id": row['message_id'] or "",
                "task": row['task'],
                "content": row['content'],
                "types": types,
                "tags": tags,
                "scopes": scopes,
                "owner": row['owner'] or "agent:unknown",
                "resource_ids": resource_ids,
                "source": source,
                "eval": eval_data,
                "created_at": created_at,
                "updated_at": updated_at,
            })

            # 收集 task 用于生成 embedding（只基于 task）
            tasks.append(row['task'])

        except Exception as e:
            print(f"⚠️  跳过无效数据 {row['id']}: {e}")
            continue

    print(f"✅ 成功转换 {len(knowledge_list)} 条知识")

    # 批量生成 embeddings
    print(f"\n🧮 正在生成 embeddings (只基于 task 字段)...")
    batch_size = 100
    all_embeddings = []

    for i in range(0, len(tasks), batch_size):
        batch_tasks = tasks[i:i+batch_size]
        print(f"   处理 {i+1}-{min(i+batch_size, len(tasks))}/{len(tasks)}...")

        try:
            embeddings = await get_embeddings_batch(batch_tasks)
            all_embeddings.extend(embeddings)
        except Exception as e:
            print(f"❌ 生成 embeddings 失败: {e}")
            return

    print(f"✅ 成功生成 {len(all_embeddings)} 个 embeddings")

    # 添加 embeddings 到知识数据
    for knowledge, embedding in zip(knowledge_list, all_embeddings):
        knowledge["embedding"] = embedding

    # 批量插入到 Milvus
    print(f"\n💾 正在插入数据到 Milvus...")
    batch_size = 100

    for i in range(0, len(knowledge_list), batch_size):
        batch = knowledge_list[i:i+batch_size]
        try:
            target_store.insert_batch(batch)
            print(f"   已插入 {min(i+batch_size, len(knowledge_list))}/{len(knowledge_list)}")
        except Exception as e:
            print(f"❌ 插入失败: {e}")
            print(f"   失败的批次: {i}-{i+batch_size}")
            # 尝试逐条插入
            for j, item in enumerate(batch):
                try:
                    target_store.insert(item)
                except Exception as e2:
                    print(f"   ⚠️  跳过 {item['id']}: {e2}")

    # 验证
    final_count = target_store.count()
    print(f"\n✅ 迁移完成!")
    print(f"   Milvus 中的知识总数: {final_count}")
    print(f"   新增: {final_count - target_store.count() + len(knowledge_list)}")


if __name__ == "__main__":
    asyncio.run(migrate_knowledge())