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const merge = require('lodash.merge')
const mapObject = require('lodash.map')

const out = value => ({ type: 'RETURN', value })
const update = state => ({ type: 'UPDATE', state })

const mapEffect = effects => {
}

class Bank {
  owner = 0x0,
  balances = {},

  constructor(state, { sender }) {
    return merge(state, {
      owner: sender
    })
  },

  deposit(state, { sender, value }) {
    return merge(state, {
      balances: mapObject(state.balances, (balance, address) => {
        return address === sender
          ? balance + value
          : balance
      })
    })
  },

  withdraw(state, msg: { sender, value, send }, args: { value }) {
    return merge(state, {
      balances: mapObject(state.balances, (balance, address) => {
        return address === sender ? 
          balance >= value : balance - value
          : new Error('Insufficient funds')
        : balance
      }
    })
  }
}

export default Bank