var semver = require('semver');

function update (compilerVersion, abi) {
  var hasConstructor = false;
  var hasFallback = false;

  for (var i = 0; i < abi.length; i++) {
    var item = abi[i];

    if (item.type === 'constructor') {
      hasConstructor = true;

      // <0.4.5 assumed every constructor to be payable
      if (semver.lt(compilerVersion, '0.4.5')) {
        item.payable = true;
      }
    } else if (item.type === 'fallback') {
      hasFallback = true;
    }

    // add 'payable' to everything
    if (semver.lt(compilerVersion, '0.4.0')) {
      item.payable = true;
    }
  }

  // 0.1.2 from Aug 2015 had it. The code has it since May 2015 (e7931ade)
  if (!hasConstructor && semver.lt(compilerVersion, '0.1.2')) {
    abi.push({
      type: 'constructor',
      payable: true,
      inputs: []
    });
  }

  if (!hasFallback && semver.lt(compilerVersion, '0.4.0')) {
    abi.push({
      type: 'fallback',
      payable: true
    });
  }

  return abi;
}

module.exports = {
  update: update
};