const Action = require('./Action.js')
const ticc = require('tic-crypto')

const Methods = ['create', 'transfer', 'exchange', 'mount']
async function actValidator (action) {
  switch (action.data.method) {
    case 'create':
      if (
        action.data.name &&
        action.data.symbol &&
        action.data.decimals &&
        Number.isSafeInteger(Number(action.data.decimals)) &&
        !(await wo.Tac.getOne({
          Tac: { name: action.data.name, symbol: action.data.symbol }
        }))
      ) {
        return true
      }
      return false
    case 'transfer':
      return (
        action.amount &&
        action.amount > 0 &&
        action.actorAddress &&
        action.toAddress &&
        action.actorAddress !== action.toAddress
      )
    case 'exchange':
      return true
    case 'mount':
      return true
    default:
      return null
  }
}

class ActionTac extends Action {
  constructor (prop) {
    super()
    Object.defineProperty(this, '_class', {
      value: 'ActionTac',
      enumerable: true,
      writable: false
    }),
      Object.defineProperty(this, 'type', {
        value: 'ActionTac',
        enumerable: true,
        writable: false
      }),
      Object.defineProperty(this, 'data', {
        value: prop,
        enumerable: true,
        writable: false
      })
  }
  static async validate (action) {
    // todo 20190409: MOM.validateMe
    return Methods.includes(action.data.method) && (await actValidator(action))
  }

  static async execute (action) {
    // todo 20190409: MOM.executeMe
    if (action && action.data.method) {
      switch (action.data.method) {
        case 'create':
          delete action._class
          let tac = new wo.Tac(
            Object.assign(
              action.data,
              action.actorAddress,
              action.actorPubkey,
              action.actorSignature
            )
          )
          tac.address = ticc.pubkey_to_address({
            pubkey: ticc.hash_easy(action.actorSignature, action.hash)
          })
          return await tac.addMe()
        case 'transfer':
          // 内部交易，转发到应用链进程来处理
          await wo.Store.decrease(
            action.actorAddress,
            0 - action.amount,
            action.address
          )
          await wo.Store.increase(
            action.toAddress,
            action.amount,
            action.address
          )
          return true
        case 'exchange':
          // Bancor类型
          return wo.Tac.exchange(action)
        case 'mount':
          return wo.Tac.mount(action)
        default:
          return 0
      }
    }
    return 0
  }
}

module.exports = ActionTac