const Block  = require('../../models/block.js');
const Transaction = require('../../models/transaction');
const logger = require('../logger');
const request = require('request');

const MAX_TXS = 20;
const MAX_BLOCKS = 1;

// Shoe horned in. Not dry, also in blocks. Make db api later
function getBlock(params, options, limit, cb) {
  const defaultOptions = { _id: 0 };

  if (!Number.isInteger(limit)) {
    limit = MAX_BLOCKS;
  }

  Object.assign(defaultOptions, options);

  Block.find(
    params,
    defaultOptions,
    cb)
    .sort({ height: -1 })
    .limit(limit);
}


function getTransactions(params, options, cb) {
  const defaultOptions = { _id: 0 };

  Object.assign(defaultOptions, options);

  Transaction.find(
    params,
    defaultOptions,
    cb)
    .sort({ height: 1 })
    .limit(MAX_TXS);
}

module.exports = function transactionAPI(router) {
  router.get('/tx/:txid', (req, res) => {
    request(`http://localhost:8332/tx/${req.params.txid}`, (err, localRes, body) => {
      if (err) {
        logger.log('error',
          `${err}`);
      }
      try {
        body = JSON.parse(body);
      } catch (e) {
        logger.log('error',
          `${err}`);
      }
      res.send({
        txid: body.hash,
        version: body.version,
        time: body.ps,
        blocktime: body.ps,
        locktime: body.locktime,
        blockhash: body.block,
        fees: body.fee,
        valueOut: body.outputs.reduce((sum, output) => sum + output.value, 0) / 1e8,
        vin: body.inputs.map(input => ({
          addr: input.coin ? input.coin.address : '',
          value: input.coin ? input.coin.value / 1e8 : 0,
        })),
        vout: body.outputs.map(output => ({
          scriptPubKey: {
            addresses: [output.address],
          },
          value: output.value / 1e8,
        })),
        isCoinbase: body.inputs[0].prevout.hash === '0000000000000000000000000000000000000000000000000000000000000000',
      });
    });
  });

  router.get('/txs', (req, res) => {
    if (req.query.block) {
      request(`http://localhost:8332/block/${req.query.block}`, (err, localRes, body) => {
        if (err) {
          logger.log('error',
            `${err}`);
        }
        try {
          body = JSON.parse(body);
        } catch (e) {
          logger.log('error',
            `${err}`);
        }
        res.send({
          pagesTotal: 1,
          txs: body.txs.map(tx => ({
            txid: tx.hash,
            fees: tx.fee,
            valueOut: tx.outputs.reduce((sum, output) => sum + output.value, 0) / 1e8,
            vin: tx.inputs.map(input => ({
              addr: input.coin ? input.coin.address : '',
              value: input.coin ? input.coin.value / 1e8 : 0,
            })),
            vout: tx.outputs.map(output => ({
              scriptPubKey: {
                addresses: [output.address],
              },
              value: output.value / 1e8,
            })),
            output: tx.outputs,
          })),
        });
      });
    } else if (req.query.address) {
      request(`http://localhost:8332/tx/address/${req.query.address}`, (err, localRes, body) => {
        if (err) {
          logger.log('error',
            `${err}`);
        }
        try {
          body = JSON.parse(body);
        } catch (e) {
          logger.log('error',
            `${err}`);
        }
          console.log(body);
        res.send({
          pagesTotal: 1,
          txs: body.map(tx => ({
            txid: tx.hash,
            fees: tx.fee,
            valueOut: tx.outputs.reduce((sum, output) => sum + output.value, 0) / 1e8,
            vin: tx.inputs.map(input => ({
              addr: input.coin ? input.coin.address : '',
              value: input.coin ? input.coin.value / 1e8 : 0,
            })),
            vout: tx.outputs.map(output => ({
              scriptPubKey: {
                addresses: [output.address],
              },
              value: output.value / 1e8,
            })),
            output: tx.outputs,
          })),
        });
      });
    } else {
      getTransactions(
        {},
        {},
        (err, txs) => {
          if (err) {
            res.status(501).send();
          }
          res.json({
            pagesTotal: 1,
            txs: txs.map(tx => ({
              txid: tx.hash,
              version: tx.version,
              locktime: tx.locktime,
              vin: tx.inputs.map(input => ({
                coinbase: input.script,
                sequence: input.sequence,
                n: 0,
              })),
              vout: tx.outputs.map(output => ({
                value: output.value,
                n: 0,
                scriptPubKey: {
                  hex: '',
                  asm: '',
                  addresses: [output.address],
                  type: output.type,
                },
                spentTxid: '',
                spentIndex: 0,
                spentHeight: 0,
              })),
            })),
          });
        },
      );
    }
  });

  router.get('/rawtx/:txid', (req, res) => {
    res.send(req.params.txid);
  });

  router.post('/tx/send', (req, res) => {
    res.send('tx send stub');
  });
};