import DB from '../../database';
import logger from '../../logger';
import lightningApi from '../../api/lightning/lightning-api-factory';
import channelsApi from '../../api/explorer/channels.api';
import * as net from 'net';

class LightningStatsUpdater {
  constructor() {}

  public async $startService() {
    logger.info('Starting Lightning Stats service');
    let isInSync = false;
    let error: any;
    try {
      error = null;
      isInSync = await this.$lightningIsSynced();
    } catch (e) {
      error = e;
    }
    if (!isInSync) {
      if (error) {
        logger.warn('Was not able to fetch Lightning Node status: ' + (error instanceof Error ? error.message : error) + '. Retrying in 1 minute...');
      } else {
        logger.notice('The Lightning graph is not yet in sync. Retrying in 1 minute...');
      }
      setTimeout(() => this.$startService(), 60 * 1000);
      return;
    }

    const now = new Date();
    const nextHourInterval = new Date(now.getFullYear(), now.getMonth(), now.getDate(), Math.floor(now.getHours() / 1) + 1, 0, 0, 0);
    const difference = nextHourInterval.getTime() - now.getTime();

    setTimeout(() => {
      setInterval(async () => {
        await this.$runTasks();
      }, 1000 * 60 * 60);
    }, difference);

    await this.$runTasks();
  }

  private async $lightningIsSynced(): Promise<boolean> {
    const nodeInfo = await lightningApi.$getInfo();
    return nodeInfo.is_synced_to_chain && nodeInfo.is_synced_to_graph;
  }

  private async $runTasks() {
    await this.$populateHistoricalData();
    await this.$logLightningStatsDaily();
    await this.$logNodeStatsDaily();
  }

  private async $logNodeStatsDaily() {
    const currentDate = new Date().toISOString().split('T')[0];
    try {
      const [state]: any = await DB.query(`SELECT string FROM state WHERE name = 'last_node_stats'`);
      // Only store once per day
      if (state[0].string === currentDate) {
        return;
      }

      logger.info(`Running daily node stats update...`);

      const query = `SELECT nodes.public_key, c1.channels_count_left, c2.channels_count_right, c1.channels_capacity_left, c2.channels_capacity_right FROM nodes LEFT JOIN (SELECT node1_public_key, COUNT(id) AS channels_count_left, SUM(capacity) AS channels_capacity_left FROM channels WHERE channels.status < 2 GROUP BY node1_public_key) c1 ON c1.node1_public_key = nodes.public_key LEFT JOIN (SELECT node2_public_key, COUNT(id) AS channels_count_right, SUM(capacity) AS channels_capacity_right FROM channels WHERE channels.status < 2 GROUP BY node2_public_key) c2 ON c2.node2_public_key = nodes.public_key`;
      const [nodes]: any = await DB.query(query);

      // First run we won't have any nodes yet
      if (nodes.length < 10) {
        return;
      }

      for (const node of nodes) {
        await DB.query(
          `INSERT INTO node_stats(public_key, added, capacity, channels) VALUES (?, NOW(), ?, ?)`,
          [node.public_key, (parseInt(node.channels_capacity_left || 0, 10)) + (parseInt(node.channels_capacity_right || 0, 10)),
            node.channels_count_left + node.channels_count_right]);
      }
      await DB.query(`UPDATE state SET string = ? WHERE name = 'last_node_stats'`, [currentDate]);
      logger.info('Daily node stats has updated.');
    } catch (e) {
      logger.err('$logNodeStatsDaily() error: ' + (e instanceof Error ? e.message : e));
    }
  }

  // We only run this on first launch
  private async $populateHistoricalData() {
    const startTime = '2018-01-13';
    try {
      const [rows]: any = await DB.query(`SELECT COUNT(*) FROM lightning_stats`);
      // Only store once per day
      if (rows[0]['COUNT(*)'] > 0) {
        return;
      }
      logger.info(`Running historical stats population...`);

      const [channels]: any = await DB.query(`SELECT capacity, created, closing_date FROM channels ORDER BY created ASC`);

      let date: Date = new Date(startTime);
      const currentDate = new Date();

      while (date < currentDate) {
        let totalCapacity = 0;
        let channelsCount = 0;
        for (const channel of channels) {
          if (new Date(channel.created) > date) {
            break;
          }
          if (channel.closing_date !== null && new Date(channel.closing_date) < date) {
            continue;
          }
          totalCapacity += channel.capacity;
          channelsCount++;
        }

        const query = `INSERT INTO lightning_stats(
          added,
          channel_count,
          node_count,
          total_capacity,
          tor_nodes,
          clearnet_nodes,
          unannounced_nodes
        )
        VALUES (FROM_UNIXTIME(?), ?, ?, ?, ?, ?, ?)`;

        await DB.query(query, [
          date.getTime() / 1000,
          channelsCount,
          0,
          totalCapacity,
          0,
          0,
          0
        ]);

        // Add one day and continue
        date.setDate(date.getDate() + 1);
      }

      const [nodes]: any = await DB.query(`SELECT first_seen, sockets FROM nodes ORDER BY first_seen ASC`);
      date = new Date(startTime);

      while (date < currentDate) {
        let nodeCount = 0;
        let clearnetNodes = 0;
        let torNodes = 0;
        let unannouncedNodes = 0;
        for (const node of nodes) {
          if (new Date(node.first_seen) > date) {
            break;
          }
          nodeCount++;

          const sockets = node.sockets.split(',');
          let isUnnanounced = true;
          for (const socket of sockets) {
            const hasOnion = socket.indexOf('.onion') !== -1;
            if (hasOnion) {
              torNodes++;
              isUnnanounced = false;
            }
            const hasClearnet = [4, 6].includes(net.isIP(socket.split(':')[0]));
            if (hasClearnet) {
              clearnetNodes++;
              isUnnanounced = false;
            }
          }
          if (isUnnanounced) {
            unannouncedNodes++;
          }
        }

        const query = `UPDATE lightning_stats SET node_count = ?, tor_nodes = ?, clearnet_nodes = ?, unannounced_nodes = ? WHERE added = FROM_UNIXTIME(?)`;

        await DB.query(query, [
          nodeCount,
          torNodes,
          clearnetNodes,
          unannouncedNodes,
          date.getTime() / 1000,
        ]);

        // Add one day and continue
        date.setDate(date.getDate() + 1);
      }

      logger.info('Historical stats populated.');
    } catch (e) {
      logger.err('$populateHistoricalData() error: ' + (e instanceof Error ? e.message : e));
    }
  }

  private async $logLightningStatsDaily() {
    const currentDate = new Date().toISOString().split('T')[0];
    try {
      const [state]: any = await DB.query(`SELECT string FROM state WHERE name = 'last_node_stats'`);
      // Only store once per day
      if (state[0].string === currentDate) {
        return;
      }

      logger.info(`Running lightning daily stats log...`);  

      const networkGraph = await lightningApi.$getNetworkGraph();
      let total_capacity = 0;
      for (const channel of networkGraph.channels) {
        if (channel.capacity) {
          total_capacity += channel.capacity;
        }
      }

      let clearnetNodes = 0;
      let torNodes = 0;
      let unannouncedNodes = 0;
      for (const node of networkGraph.nodes) {
        let isUnnanounced = true;
        for (const socket of node.sockets) {
          const hasOnion = socket.indexOf('.onion') !== -1;
          if (hasOnion) {
            torNodes++;
            isUnnanounced = false;
          }
          const hasClearnet = [4, 6].includes(net.isIP(socket.split(':')[0]));
          if (hasClearnet) {
            clearnetNodes++;
            isUnnanounced = false;
          }
        }
        if (isUnnanounced) {
          unannouncedNodes++;
        }
      }

      const channelStats = await channelsApi.$getChannelsStats();

      const query = `INSERT INTO lightning_stats(
          added,
          channel_count,
          node_count,
          total_capacity,
          tor_nodes,
          clearnet_nodes,
          unannounced_nodes,
          avg_capacity,
          avg_fee_rate,
          avg_base_fee_mtokens,
          med_capacity,
          med_fee_rate,
          med_base_fee_mtokens
        )
        VALUES (NOW(), ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`;

      await DB.query(query, [
        networkGraph.channels.length,
        networkGraph.nodes.length,
        total_capacity,
        torNodes,
        clearnetNodes,
        unannouncedNodes,
        channelStats.avgCapacity,
        channelStats.avgFeeRate,
        channelStats.avgBaseFee,
        channelStats.medianCapacity,
        channelStats.medianFeeRate,
        channelStats.medianBaseFee,
      ]);
      logger.info(`Lightning daily stats done.`);
    } catch (e) {
      logger.err('$logLightningStatsDaily() error: ' + (e instanceof Error ? e.message : e));
    }
  }
}

export default new LightningStatsUpdater();