const bitcoindService = require('services/bitcoind.js');
const BitcoindError = require('models/errors.js').BitcoindError;

async function getBlockCount() {
  const blockCount = await bitcoindService.getBlockCount();

  return { blockCount: blockCount.result };
}

async function getConnectionsCount() {
  const peerInfo = await bitcoindService.getPeerInfo();

  var outBoundConnections = 0;
  var inBoundConnections = 0;

  peerInfo.result.forEach(function (peer) {
    if (peer.inbound === false) {
      outBoundConnections++;

      return;
    }
    inBoundConnections++;
  });

  const connections = {
    total: inBoundConnections + outBoundConnections,
    inbound: inBoundConnections,
    outbound: outBoundConnections
  };

  return connections;
}

async function getStatus() {
  try {
    await bitcoindService.help();

    return { operational: true };
  } catch (error) {
    if (error instanceof BitcoindError) {
      return { operational: false };
    }

    throw error;
  }
}

// Return the max synced header for all connected peers or -1 if no data is available.
async function getMaxSyncHeader() {
  const peerInfo = (await bitcoindService.getPeerInfo()).result;

  if (peerInfo.length === 0) {
    return -1;
  }

  const maxPeer = peerInfo.reduce(function (prev, current) {
    return prev.syncedHeaders > current.syncedHeaders ? prev : current;
  });

  return maxPeer.syncedHeaders;
}

async function getMempoolInfo() {
  return await bitcoindService.getMempoolInfo();
}

async function getLocalSyncInfo() {
  const info = await bitcoindService.getBlockChainInfo();

  var blockChainInfo = info.result;
  var chain = blockChainInfo.chain;
  var blockCount = blockChainInfo.blocks;
  var headerCount = blockChainInfo.headers;

  const percentSynced = (Math.trunc(blockCount / headerCount * 10000) / 10000).toFixed(4); // eslint-disable-line no-magic-numbers, max-len

  return {
    chain: chain,
    percent: percentSynced,
    currentBlock: blockCount,
    headerCount: headerCount // eslint-disable-line object-shorthand,
  };
}

async function getSyncStatus() {
  const maxPeerHeader = await getMaxSyncHeader();
  const localSyncInfo = await getLocalSyncInfo();

  if (maxPeerHeader > localSyncInfo.headerCount) {
    localSyncInfo.headerCount = maxPeerHeader;
  }

  return localSyncInfo;
}

async function getVersion() {
  const networkInfo = await bitcoindService.getNetworkInfo();
  const unformattedVersion = networkInfo.result.subversion;

  // Remove all non-digits or decimals.
  const version = unformattedVersion.replace(/[^\d.]/g, '');

  return { version: version }; // eslint-disable-line object-shorthand
}

async function getBlock(hash) {
  const blockObj = await bitcoindService.getBlock(hash);
  return {
    block: hash,
    confirmations: blockObj.result.confirmations,
    size: blockObj.result.size,
    height: blockObj.result.height,
    blocktime: blockObj.result.time,
    prevblock: blockObj.result.previousblockhash,
    nextblock: blockObj.result.nextblockhash,
    transactions: blockObj.result.tx
  }
}

async function getTransaction(txid) {
  const transactionObj = await bitcoindService.getTransaction(txid);
  return {
    txid: txid,
    timestamp: transactionObj.result.time,
    confirmations: transactionObj.result.confirmations,
    blockhash: transactionObj.result.blockhash,
    size: transactionObj.result.size,
    input: transactionObj.result.vin.txid,
    utxo: transactionObj.result.vout,
    rawtx: transactionObj.result.hex
  }
}

async function getNetworkInfo() {
  const networkInfo = await bitcoindService.getNetworkInfo();

  return networkInfo.result; // eslint-disable-line object-shorthand
}

async function getBlockHash(height) {
  const getBlockHashObj = await bitcoindService.getBlockHash(height);

  return {
    hash: getBlockHashObj.result
  }
}

async function nodeStatusDump() {
  const blockchainInfo = await bitcoindService.getBlockChainInfo();
  const networkInfo = await bitcoindService.getNetworkInfo();
  const mempoolInfo = await bitcoindService.getMempoolInfo();
  const miningInfo = await bitcoindService.getMiningInfo();

  return {
    blockchain_info: blockchainInfo.result,
    network_info: networkInfo.result,
    mempool: mempoolInfo.result,
    mining_info: miningInfo.result
  }
}

async function nodeStatusSummary() {
  const blockchainInfo = await bitcoindService.getBlockChainInfo();
  const networkInfo = await bitcoindService.getNetworkInfo();
  const mempoolInfo = await bitcoindService.getMempoolInfo();
  const miningInfo = await bitcoindService.getMiningInfo();

  return {
    difficulty: blockchainInfo.result.difficulty,
    size: blockchainInfo.result.sizeOnDisk,
    mempool: mempoolInfo.result.bytes,
    connections: networkInfo.result.connections,
    networkhashps: miningInfo.result.networkhashps
  }
}

module.exports = {
  getBlockHash,
  getTransaction,
  getBlock,
  getBlockCount,
  getConnectionsCount,
  getNetworkInfo,
  getMempoolInfo,
  getStatus,
  getSyncStatus,
  getVersion,
  nodeStatusDump,
  nodeStatusSummary
};