# All files / src/tx/applyTx utils.js

98.61% Statements 71/72
98.36% Branches 60/61
100% Functions 9/9
98.55% Lines 68/69

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     /**
     * Copyright (c) 2018-present, Leap DAO (leapdao.org)
     *
     * This source code is licensed under the Mozilla Public License Version 2.0
     * found in the LICENSE file in the root directory of this source tree.
     */

    const { Outpoint, Type } = require('leap-core');
    const {
      BigInt,
      add,
      subtract,
      divide,
      lessThan,
      greaterThan,
    } = require('jsbi-utils');
    const { isNFT, isNST } = require('../../utils');
    const { uniq, isEqual } = require('lodash');

    const groupValuesByColor = (values, { color, value }) => {
      Iif (!isNFT(color) && !isNST(color) && lessThan(BigInt(value), BigInt(1))) {
        throw new Error('One of the outs has value < 1');
      }
      return Object.assign({}, values, {
        [color]:
          isNFT(color) || isNST(color)
            ? (values[color] || new Set()).add(BigInt(value))
            : add(values[color] || BigInt(0), BigInt(value)),
      });
    };

    const checkInsAndOuts = (tx, state, bridgeState, unspentFilter) => {
      const inputTransactions = tx.inputs
        .map(input => state.unspent[input.prevout.hex()])
        .filter(unspentFilter);
      if (tx.inputs.length !== inputTransactions.length) {
        throw new Error('Wrong inputs');
      }

      const insValues = inputTransactions.reduce(groupValuesByColor, {});
      const outsValues = tx.outputs.reduce(groupValuesByColor, {});
      const colors = uniq([
        ...Object.keys(insValues),
        ...Object.keys(outsValues),
      ]).map(Number);
      const minGasPrice = BigInt(state.gas.minPrice);
      const gas = Math.max(0, tx.outputs.length * 20000 - tx.inputs.length * 10000);
      for (const color of colors) {
        const inputValue = insValues[color] || BigInt(0);
        const outputValue = outsValues[color] || BigInt(0);
        if (
          color === 0 &&
          gas > 0 &&
          greaterThan(minGasPrice, 0) &&
          tx.type === Type.TRANSFER
        ) {
          const txGasPrice = divide(subtract(inputValue, outputValue), BigInt(gas));
          if (lessThan(txGasPrice, minGasPrice)) {
            throw new Error(`Tx underpriced`);
          }
        }
        const isNFTByColor = isNFT(color) || isNST(color);
        if (
          (isNFTByColor && !isEqual(inputValue, outputValue)) ||
          (!isNFTByColor && greaterThan(outputValue, inputValue))
        ) {
          throw new Error(`Ins and outs values are mismatch for color ${color}`);
        }
      }
    };

    const checkOutpoints = (state, tx) => {
      if (tx.type === Type.PERIOD_VOTE) return;
      tx.inputs.forEach(input => {
        const outpointId = input.prevout.hex();
        if (!state.unspent[outpointId]) {
          throw new Error('Trying to spend non-existing output');
        }
      });
    };

    const addOutputs = ({ balances, owners, unspent }, tx) => {
      if (tx.type === Type.PERIOD_VOTE) return;
      tx.outputs.forEach((out, outPos) => {
        const outpoint = new Outpoint(tx.hash(), outPos);
        if (unspent[outpoint.hex()] !== undefined) {
          throw new Error('Attempt to create existing output');
        }
        const cBalances = balances[out.color] || {};
        const cOwners = owners[out.color] || {};
        const tokenIsNFT = isNFT(out.color);
        const tokenIsNST = isNST(out.color);

        balances[out.color] = cBalances;
        owners[out.color] = cOwners;

        if (tokenIsNFT || tokenIsNST) {
          cBalances[out.address] = cBalances[out.address] || [];
          cBalances[out.address].push(out.value);
          cOwners[out.value] = out.address;
        } else {
          cBalances[out.address] = BigInt(cBalances[out.address] || 0);
          cBalances[out.address] = add(
            cBalances[out.address],
            out.value
          ).toString();
        }
        unspent[outpoint.hex()] = out.toJSON();
      });
    };

    const removeInputs = ({ unspent, balances, owners }, tx) => {
      if (tx.type === Type.PERIOD_VOTE) return;
      tx.inputs.forEach(input => {
        const outpointId = input.prevout.hex();
        const { address, value, color } = unspent[outpointId];

        if (isNFT(color) || isNST(color)) {
          const index = balances[color][address].indexOf(value);
          balances[color][address].splice(index, 1);
          delete owners[color][BigInt(value).toString()];
        } else {
          balances[color][address] = subtract(
            BigInt(balances[color][address]),
            BigInt(value)
          ).toString();
        }
        delete unspent[outpointId];
      });
    };

    exports.checkInsAndOuts = checkInsAndOuts;
    exports.checkOutpoints = checkOutpoints;
    exports.groupValuesByColor = groupValuesByColor;
    exports.addOutputs = addOutputs;
    exports.removeInputs = removeInputs;