// 从MongoDB的short表同步数据到ClickHouse的links表
import { getVariable, setVariable } from "npm:windmill-client@1";
import { MongoClient, ObjectId } from "https://deno.land/x/mongo@v0.32.0/mod.ts";

interface MongoConfig {
  host: string;
  port: string;
  db: string;
  username: string;
  password: string;
}

interface ClickHouseConfig {
  clickhouse_host: string;
  clickhouse_port: number;
  clickhouse_user: string;
  clickhouse_password: string;
  clickhouse_database: string;
  clickhouse_url: string;
}

interface ShortRecord {
  _id: ObjectId;
  slug: string;          // 短链接的slug部分
  origin: string;        // 原始URL
  domain?: string;       // 域名
  createTime: number;    // 创建时间戳
  user?: string;         // 创建用户
  title?: string;        // 标题
  description?: string;  // 描述
  tags?: string[];       // 标签
  active?: boolean;      // 是否活跃
  expiresAt?: number;    // 过期时间戳
  teamId?: string;       // 团队ID
  projectId?: string;    // 项目ID
}

interface SyncState {
  last_sync_time: number;
  records_synced: number;
  last_sync_id?: string;
}

export async function main(
  batch_size = 100,
  initial_sync = false,
  max_records = 999999,
  timeout_minutes = 30,
  skip_clickhouse_check = false,
  force_insert = false
) {
  const logWithTimestamp = (message: string) => {
    const now = new Date();
    console.log(`[${now.toISOString()}] ${message}`);
  };

  logWithTimestamp("开始执行MongoDB到ClickHouse的短链接同步任务...");
  logWithTimestamp(`批处理大小: ${batch_size}, 最大记录数: ${max_records}, 超时时间: ${timeout_minutes}分钟`);
  if (skip_clickhouse_check) {
    logWithTimestamp("⚠️ 警告: 已启用跳过ClickHouse检查模式，不会检查记录是否已存在");
  }
  if (force_insert) {
    logWithTimestamp("⚠️ 警告: 已启用强制插入模式，将尝试插入所有记录");
  }

  // 设置超时
  const startTime = Date.now();
  const timeoutMs = timeout_minutes * 60 * 1000;
  
  // 检查是否超时
  const checkTimeout = () => {
    if (Date.now() - startTime > timeoutMs) {
      console.log(`运行时间超过${timeout_minutes}分钟，暂停执行`);
      return true;
    }
    return false;
  };

  // 获取MongoDB和ClickHouse的连接信息
  let mongoConfig: MongoConfig;
  let clickhouseConfig: ClickHouseConfig;
  
  try {
    const rawMongoConfig = await getVariable("f/shorturl_analytics/mongodb");
    console.log("原始MongoDB配置:", typeof rawMongoConfig === "string" ? rawMongoConfig : JSON.stringify(rawMongoConfig));
    
    // 尝试解析配置，如果是字符串形式
    if (typeof rawMongoConfig === "string") {
      try {
        mongoConfig = JSON.parse(rawMongoConfig);
      } catch (e) {
        console.error("MongoDB配置解析失败:", e);
        throw e;
      }
    } else {
      mongoConfig = rawMongoConfig as MongoConfig;
    }
    
    const rawClickhouseConfig = await getVariable("f/shorturl_analytics/clickhouse");
    console.log("原始ClickHouse配置:", typeof rawClickhouseConfig === "string" ? rawClickhouseConfig : JSON.stringify(rawClickhouseConfig));
    
    // 尝试解析配置，如果是字符串形式
    if (typeof rawClickhouseConfig === "string") {
      try {
        clickhouseConfig = JSON.parse(rawClickhouseConfig);
      } catch (e) {
        console.error("ClickHouse配置解析失败:", e);
        throw e;
      }
    } else {
      clickhouseConfig = rawClickhouseConfig as ClickHouseConfig;
    }
    
    console.log("MongoDB配置解析为:", JSON.stringify(mongoConfig));
    console.log("ClickHouse配置解析为:", JSON.stringify(clickhouseConfig));
  } catch (error) {
    console.error("获取配置失败:", error);
    throw error;
  }

  // 构建MongoDB连接URL
  let mongoUrl = "mongodb://";
  if (mongoConfig.username && mongoConfig.password) {
    mongoUrl += `${mongoConfig.username}:${mongoConfig.password}@`;
  }
  mongoUrl += `${mongoConfig.host}:${mongoConfig.port}/${mongoConfig.db}`;

  console.log(`MongoDB连接URL: ${mongoUrl.replace(/:[^:]*@/, ":****@")}`);

  // 获取上次同步的状态
  let syncState: SyncState;
  try {
    const rawSyncState = await getVariable<string>("f/shorturl_analytics/clickhouse/shorturl_links_sync_state");
    try {
      syncState = JSON.parse(rawSyncState);
      console.log(`获取同步状态成功: 上次同步时间 ${new Date(syncState.last_sync_time).toISOString()}`);
    } catch (parseError) {
      console.error("解析同步状态失败:", parseError);
      throw parseError;
    }
  } catch (_unused_error) {
    console.log("未找到同步状态，创建初始同步状态");
    syncState = {
      last_sync_time: 0,
      records_synced: 0,
    };
  }

  // 如果强制从头开始同步
  if (initial_sync) {
    console.log("强制从头开始同步");
    syncState = {
      last_sync_time: 0,
      records_synced: 0,
    };
  }

  // 连接MongoDB
  const client = new MongoClient();
  try {
    await client.connect(mongoUrl);
    console.log("MongoDB连接成功");

    const db = client.database(mongoConfig.db);
    const shortCollection = db.collection<ShortRecord>("short");
    
    // 构建查询条件，只查询新的记录
    const query: Record<string, unknown> = {};
    
    if (syncState.last_sync_time > 0) {
      query.createTime = { $gt: syncState.last_sync_time };
    }

    if (syncState.last_sync_id) {
      // 如果有上次同步的ID，则从该ID之后开始查询
      query._id = { $gt: new ObjectId(syncState.last_sync_id) };
    }

    // 计算总记录数
    const totalRecords = await shortCollection.countDocuments(query);
    console.log(`找到 ${totalRecords} 条新短链接记录需要同步`);

    // 限制此次处理的记录数量
    const recordsToProcess = Math.min(totalRecords, max_records);
    console.log(`本次将处理 ${recordsToProcess} 条记录`);

    if (totalRecords === 0) {
      console.log("没有新记录需要同步，任务完成");
      return {
        success: true,
        records_synced: 0,
        total_synced: syncState.records_synced,
        message: "没有新记录需要同步"
      };
    }

    // 分批处理记录
    let processedRecords = 0;
    let lastId: string | undefined;
    let lastCreateTime = syncState.last_sync_time;
    let totalBatchRecords = 0;

    // 检查ClickHouse连接状态
    const checkClickHouseConnection = async (): Promise<boolean> => {
      if (skip_clickhouse_check) {
        logWithTimestamp("已启用跳过ClickHouse检查，不测试连接");
        return true;
      }
      
      try {
        logWithTimestamp("测试ClickHouse连接...");
        const clickhouseUrl = `${clickhouseConfig.clickhouse_url}`;
        const response = await fetch(clickhouseUrl, {
          method: "POST",
          headers: {
            "Content-Type": "application/x-www-form-urlencoded",
            "Authorization": `Basic ${btoa(`${clickhouseConfig.clickhouse_user}:${clickhouseConfig.clickhouse_password}`)}`,
          },
          body: "SELECT 1 FORMAT JSON",
          signal: AbortSignal.timeout(5000)
        });
        
        if (response.ok) {
          logWithTimestamp("ClickHouse连接测试成功");
          return true;
        } else {
          const errorText = await response.text();
          logWithTimestamp(`ClickHouse连接测试失败: ${response.status} ${errorText}`);
          return false;
        }
      } catch (err) {
        const error = err as Error;
        logWithTimestamp(`ClickHouse连接测试失败: ${error.message}`);
        return false;
      }
    };

    // 检查记录是否已经存在于ClickHouse中
    const checkExistingRecords = async (records: ShortRecord[]): Promise<ShortRecord[]> => {
      if (records.length === 0) return [];
      
      // 如果跳过ClickHouse检查或强制插入，则直接返回所有记录
      if (skip_clickhouse_check || force_insert) {
        logWithTimestamp(`已跳过ClickHouse重复检查，准备处理所有 ${records.length} 条记录`);
        return records;
      }
      
      logWithTimestamp(`正在检查 ${records.length} 条短链接记录是否已存在于ClickHouse中...`);
      
      try {
        // 提取所有记录的ID
        const recordIds = records.map(record => record._id.toString());
        logWithTimestamp(`待检查的短链接ID: ${recordIds.join(', ')}`);
        
        // 构建查询SQL，检查记录是否已存在
        const query = `
          SELECT link_id 
          FROM ${clickhouseConfig.clickhouse_database}.links 
          WHERE link_id IN ('${recordIds.join("','")}')
          FORMAT JSON
        `;
        
        logWithTimestamp(`执行ClickHouse查询: ${query.replace(/\n\s*/g, ' ')}`);
        
        // 发送请求到ClickHouse
        const clickhouseUrl = `${clickhouseConfig.clickhouse_url}`;
        const response = await fetch(clickhouseUrl, {
          method: "POST",
          headers: {
            "Content-Type": "application/x-www-form-urlencoded",
            "Authorization": `Basic ${btoa(`${clickhouseConfig.clickhouse_user}:${clickhouseConfig.clickhouse_password}`)}`
          },
          body: query,
          signal: AbortSignal.timeout(10000)
        });
        
        if (!response.ok) {
          const errorText = await response.text();
          throw new Error(`ClickHouse查询错误: ${response.status} ${errorText}`);
        }
        
        // 获取响应文本
        const responseText = await response.text();
        logWithTimestamp(`ClickHouse查询响应: ${responseText.slice(0, 200)}${responseText.length > 200 ? '...' : ''}`);
        
        if (!responseText.trim()) {
          logWithTimestamp("ClickHouse返回空响应，假定没有记录存在");
          return records;
        }
        
        // 解析结果
        let result;
        try {
          result = JSON.parse(responseText);
        } catch (err) {
          logWithTimestamp(`ClickHouse响应不是有效的JSON: ${responseText}`);
          throw new Error(`解析ClickHouse响应失败: ${(err as Error).message}`);
        }
        
        // 确保result有正确的结构
        if (!result.data) {
          logWithTimestamp(`ClickHouse响应缺少data字段: ${JSON.stringify(result)}`);
          return records;
        }
        
        // 提取已存在的记录ID
        const existingIds = new Set(result.data.map((row: { link_id: string }) => row.link_id));
        
        logWithTimestamp(`检测到 ${existingIds.size} 条记录已存在于ClickHouse中`);
        if (existingIds.size > 0) {
          logWithTimestamp(`已存在的记录ID: ${Array.from(existingIds).join(', ')}`);
        }
        
        // 过滤出不存在的记录
        const newRecords = records.filter(record => !existingIds.has(record._id.toString()));
        logWithTimestamp(`过滤后剩余 ${newRecords.length} 条新记录需要插入`);
        
        return newRecords;
      } catch (err) {
        const error = err as Error;
        logWithTimestamp(`ClickHouse查询出错: ${error.message}`);
        if (skip_clickhouse_check) {
          logWithTimestamp("已启用跳过ClickHouse检查，将继续处理所有记录");
          return records;
        } else {
          throw error;
        }
      }
    };

    // 在处理记录前先检查ClickHouse连接
    const clickhouseConnected = await checkClickHouseConnection();
    if (!clickhouseConnected && !skip_clickhouse_check) {
      logWithTimestamp("⚠️ ClickHouse连接测试失败，请启用skip_clickhouse_check=true参数来跳过连接检查");
      throw new Error("ClickHouse连接失败，无法继续同步");
    }

    // 处理记录的函数
    const processRecords = async (records: ShortRecord[]) => {
      if (records.length === 0) return 0;
      
      logWithTimestamp(`开始处理批次数据，共 ${records.length} 条短链接记录...`);
      
      // 检查记录是否已存在
      let newRecords;
      try {
        newRecords = await checkExistingRecords(records);
      } catch (err) {
        const error = err as Error;
        logWithTimestamp(`检查记录是否存在时出错: ${error.message}`);
        if (!skip_clickhouse_check && !force_insert) {
          throw error;
        }
        // 如果跳过检查或强制插入，则使用所有记录
        logWithTimestamp("将使用所有记录进行处理");
        newRecords = records;
      }
      
      if (newRecords.length === 0) {
        logWithTimestamp("所有记录都已存在，跳过处理");
        // 更新同步状态，即使没有新增记录
        const lastRecord = records[records.length - 1];
        lastId = lastRecord._id.toString();
        lastCreateTime = lastRecord.createTime;
        return 0;
      }
      
      logWithTimestamp(`准备处理 ${newRecords.length} 条新短链接记录...`);
      
      // 准备ClickHouse插入数据
      const clickhouseData = newRecords.map(record => {
        // 转换MongoDB记录为ClickHouse格式，匹配ClickHouse表结构
        // 处理日期时间，移除ISO格式中的Z以使ClickHouse正确解析
        const createdAtStr = new Date(record.createTime).toISOString().replace('Z', '');
        const expiresAtStr = record.expiresAt ? new Date(record.expiresAt).toISOString().replace('Z', '') : null;
        
        return {
          link_id: record._id.toString(), // 使用MongoDB的_id作为link_id
          original_url: record.origin || "",
          created_at: createdAtStr,
          created_by: record.user || "unknown",
          title: record.slug, // 使用slug作为title
          description: record.description || "",
          tags: record.tags || [],
          is_active: record.active !== undefined ? record.active : true,
          expires_at: expiresAtStr,
          team_id: record.teamId || "",
          project_id: record.projectId || ""
        };
      });

      // 更新同步状态（使用原始records的最后一条，以确保进度正确）
      const lastRecord = records[records.length - 1];
      lastId = lastRecord._id.toString();
      lastCreateTime = lastRecord.createTime;
      logWithTimestamp(`更新同步位置到: ID=${lastId}, 时间=${new Date(lastCreateTime).toISOString()}`);

      // 生成ClickHouse插入SQL
      // 注意：Array类型需要特殊处理，这里将tags作为JSON字符串处理
      const insertSQL = `
        INSERT INTO ${clickhouseConfig.clickhouse_database}.links 
        (link_id, original_url, created_at, created_by, title, description, tags, is_active, expires_at, team_id, project_id)
        VALUES 
        ${clickhouseData.map(record => {
          // 处理tags数组
          const tagsStr = JSON.stringify(record.tags || []);
          
          // 处理expires_at可能为null的情况
          const expiresAt = record.expires_at ? `'${record.expires_at}'` : "NULL";
          
          // 确保所有字段在使用replace前都有默认值
          const safeOriginalUrl = (record.original_url || "").replace(/'/g, "''");
          const safeCreatedBy = (record.created_by || "unknown").replace(/'/g, "''");
          const safeTitle = (record.title || "无标题").replace(/'/g, "''");
          const safeDescription = (record.description || "").replace(/'/g, "''");
          const safeTeamId = record.team_id || "";
          const safeProjectId = record.project_id || "";
          
          return `('${record.link_id}', '${safeOriginalUrl}', '${record.created_at}', '${safeCreatedBy}', '${safeTitle}', '${safeDescription}', ${tagsStr}, ${record.is_active}, ${expiresAt}, '${safeTeamId}', '${safeProjectId}')`;
        }).join(", ")}
      `;

      if (clickhouseData.length === 0) {
        console.log("没有新记录需要插入");
        return 0;
      }

      // 发送请求到ClickHouse
      const clickhouseUrl = `${clickhouseConfig.clickhouse_url}`;
      try {
        logWithTimestamp("发送插入请求到ClickHouse...");
        const response = await fetch(clickhouseUrl, {
          method: "POST",
          headers: {
            "Content-Type": "application/x-www-form-urlencoded",
            "Authorization": `Basic ${btoa(`${clickhouseConfig.clickhouse_user}:${clickhouseConfig.clickhouse_password}`)}`
          },
          body: insertSQL,
          signal: AbortSignal.timeout(20000)
        });

        if (!response.ok) {
          const errorText = await response.text();
          throw new Error(`ClickHouse插入错误: ${response.status} ${errorText}`);
        }

        logWithTimestamp(`成功插入 ${newRecords.length} 条短链接记录到ClickHouse`);
        return newRecords.length;
      } catch (err) {
        const error = err as Error;
        logWithTimestamp(`向ClickHouse插入数据失败: ${error.message}`);
        throw error;
      }
    };

    // 批量处理记录
    for (let page = 0; processedRecords < recordsToProcess; page++) {
      // 检查超时
      if (checkTimeout()) {
        logWithTimestamp(`已处理 ${processedRecords}/${recordsToProcess} 条记录，因超时暂停执行`);
        break;
      }

      // 每批次都输出进度
      logWithTimestamp(`开始处理第 ${page+1} 批次，已完成 ${processedRecords}/${recordsToProcess} 条记录 (${Math.round(processedRecords/recordsToProcess*100)}%)`);
      
      logWithTimestamp(`正在从MongoDB获取第 ${page+1} 批次数据...`);
      const records = await shortCollection.find(query)
        .sort({ createTime: 1, _id: 1 })
        .skip(page * batch_size)
        .limit(batch_size)
        .toArray();

      if (records.length === 0) {
        logWithTimestamp(`第 ${page+1} 批次没有找到数据，结束处理`);
        break;
      }
      
      logWithTimestamp(`获取到 ${records.length} 条记录，开始处理...`);
      // 输出当前批次的部分数据信息
      if (records.length > 0) {
        logWithTimestamp(`批次 ${page+1} 第一条记录: ID=${records[0]._id}, Slug=${records[0].slug}, 时间=${new Date(records[0].createTime).toISOString()}`);
        if (records.length > 1) {
          logWithTimestamp(`批次 ${page+1} 最后一条记录: ID=${records[records.length-1]._id}, Slug=${records[records.length-1].slug}, 时间=${new Date(records[records.length-1].createTime).toISOString()}`);
        }
      }

      const batchSize = await processRecords(records);
      processedRecords += records.length; // 总是增加处理的记录数，即使有些记录已存在
      totalBatchRecords += batchSize; // 只增加实际插入的记录数

      logWithTimestamp(`第 ${page+1} 批次处理完成。已处理 ${processedRecords}/${recordsToProcess} 条记录，实际插入 ${totalBatchRecords} 条 (${Math.round(processedRecords/recordsToProcess*100)}%)`);

      // 更新查询条件，以便下一批次查询
      query.createTime = { $gt: lastCreateTime };
      if (lastId) {
        query._id = { $gt: new ObjectId(lastId) };
      }
      logWithTimestamp(`更新查询条件: 创建时间 > ${new Date(lastCreateTime).toISOString()}, ID > ${lastId || 'none'}`);
    }

    // 更新同步状态
    const newSyncState: SyncState = {
      last_sync_time: lastCreateTime,
      records_synced: syncState.records_synced + totalBatchRecords,
      last_sync_id: lastId
    };

    await setVariable("f/shorturl_analytics/clickhouse/shorturl_links_sync_state", JSON.stringify(newSyncState));
    console.log(`同步状态已更新: 最后同步时间 ${new Date(newSyncState.last_sync_time).toISOString()}, 总同步记录数 ${newSyncState.records_synced}`);

    return {
      success: true,
      records_processed: processedRecords,
      records_synced: totalBatchRecords,
      total_synced: newSyncState.records_synced,
      last_sync_time: new Date(newSyncState.last_sync_time).toISOString(),
      message: "短链接数据同步完成"
    };
  } catch (err) {
    console.error("同步过程中发生错误:", err);
    return {
      success: false,
      error: err instanceof Error ? err.message : String(err),
      stack: err instanceof Error ? err.stack : undefined
    };
  } finally {
    // 关闭MongoDB连接
    await client.close();
    console.log("MongoDB连接已关闭");
  }
}