const Action = require('./Action.js')

/** ****************** Public of instance ********************/

const DAD = module.exports = function ActionMultisig (prop) {
  this._class = this.constructor.name
  this.setProp(prop) // 没有定义 DAD.prototype._model，因此继承了上级Action.prototype._model，因此通过this.setProp，继承了上级Action定义的实例自有数据。另一个方案是，调用 Action.call(this, prop)
  this.type = this.constructor.name
}
DAD.__proto__ = Action
// DAD._table=DAD.name // 注释掉，从而继承父类Action的数据库表格名
const MOM = DAD.prototype
MOM.__proto__ = Action.prototype

MOM.signMe = function (seckey) { // 由前端调用，后台不该进行签名
  let json = this.getJson({ exclude: ['hash', 'blockHash', 'actorSignature', 'json'] }) // 是前端用户发起事务时签字，这时候还不知道进入哪个区块，所以不能计入blockHash
  this.actorSignature = wo.Crypto.sign(json, seckey)
  return this
}

MOM.verifySig = function () {
  let json = this.getJson(({ exclude: ['hash', 'blockHash', 'actorSignature', 'json'] }))
  let res = wo.Crypto.verify(json, this.actorSignature, this.actorPubkey)
  return res
}

MOM.verifyAddress = function () {
  return this.actorAddress === wo.Crypto.pubkey2address(this.actorPubkey)
}

MOM.hashMe = function () {
  this.hash = wo.Crypto.hash(this.getJson({ exclude: ['hash', 'blockHash', 'json'] })) // block.hash 受到所包含的actionList影响，所以action不能受blockHash影响，否则循环了
  return this
}

MOM.verifyHash = function () {
  return this.hash === wo.Crypto.hash(this.getJson({ exclude: ['hash', 'blockHash', 'json'] }))
}

MOM.packMe = function (keypair) { // 由前端调用，后台不创建
  this.actorPubkey = keypair.pubkey
  this.actorAddress = wo.Crypto.pubkey2address(keypair.pubkey)
  this.timestamp = new Date()

  this.signMe(keypair.seckey)
  this.hashMe()
  return this
}

MOM.checkMultiSig = function (account) {
  let json = this.getJson(({ exclude: ['hash', 'blockHash', 'actorSignature', 'json'] }))
  let sigers = Object.keys(this.json) // 公钥列表
  // 交易发起人的签名在prepare的verifySig里已经检查过合法性，
  if (account.multiSignatures.keysgroup.indexOf(this.actorPubkey) === -1) {
    let M = 1 // 如果不在keysgroup里，可以把交易发起人算一个有效的签名，因此M从1算起
  } else {
    let M = 0 // 如果发起人已经在keysgroup里则从0算起
  }
  for (let i of sigers) // 该交易内已签名的每一个公钥
  {
    if (account.multiSignatures.keysgroup.indexOf(i) !== -1 && wo.Crypto.verify(json, this.json[i], i)) {
      M++
    }
  }
  return M >= account.multiSignatures.min
}
/** ****************** Shared by instances ********************/

/*
1.创建多重签名账户
{
    "ActionMultisig":{
        "actorPubkey": "actorPubkey",
        "actorAddress": "actorAddress",
        "actorSignature":"actorSignature",
        "fee":1,
        "json":{
            act: "create",
            min: 2,
            lifetime: 10,   //暂时无用，因为每个交易的挂起时间需求可能不同
            keysgroup:[
                pubkey_a,
                pubkey_b,
                ...
                pubkey_n
            ]
        }
    }
}
2.多重签名账户交易
step1:发起一个多重签名账户的交易。该交易只是在缓存里，为了给多重签名账户的控制者们提供真正要写入区块链的源Action数据
{
    "ActionMultisig":{
        "amount": 100,
        "fee": 1,
        "actorPubkey": "actorPubkey",
        "actorAddress": "actorAddress",
        "actorSignature":"actorSignature",
        "toAddress": "toAddress",
        "json":{
            act: "createTransfer",
            lifetime: 10,
        }
    }
}
step2:所有人签名
{
    "ActionMultisig":{
        "amount": 100,
        "fee": 1,
        "actorPubkey": "actorPubkey",
        "actorAddress": "actorAddress",
        "actorSignature":"actorSignature",
        "toAddress": "toAddress",
        "json":{
            act: 'addSig',
            signature: 'signature',
        }
    }
}
step3:发起人申请执行
{
    "ActionMultisig":{
        "amount": 100,
        "fee": 1,
        "actorPubkey": "actorPubkey",
        "actorAddress": "actorAddress",
        "actorSignature":"actorSignature",
        "toAddress": "toAddress",
        "json":{
            act:'emitTransfer'
            'pubkey1':'sig1',
            'pubkey2':'sig2',
            ......
            'pubkeyn':'sign',
        }
    }
}
*/

MOM.validateMe = async function () {
  return wo.Crypto.isAddress(this.toAddress) &&
    this.fee >= wo.Config.MIN_FEE_ActionTransfer &&
    this.toAddress != this.actorAddress
}

MOM.executableMe = async function () {
  if (this.json.act === 'createTransfer') { // 创建挂起的多重签名事务
    DAD.pendingPool[this.hash] = this
    return false
  } else if (this.json.act === 'addSig') { // 签名者签名
    DAD.pendingPool[this.hash].json[this.actorPubkey] = this.json.signature
    return false
  }
  return true
}

MOM.executeMe = async function () {
  switch (this.json.act) {
    // 多重签名账户注册
    case 'sign': {
      let actor = await wo.Account.getOne({ Account: { address: this.actorAddress } })
      if (actor && actor.type !== 'multisig') {
        // 检查账户类型，只有不是多重签名账户的才可以执行
        // todo:类型检查，安全操作
        await actor.setMe({ Account: { multiSignatures: {
          min: this.json.min,
          ttl: this.json.ttl, // 该账户交易的最大挂起时间
          keysgroup: this.json.keysgroup
        } },
        cond: { address: actor.address } })
      }
      return this
    }
    // 多重签名账户执行转账
    case 'emitTransfer': {
      let sender = await wo.Account.getOne({ Account: { address: this.actorAddress } })
      if (sender && this.checkMultiSig(sender) && this.toAddress != this.actorAddress && sender.balance >= this.amount + this.fee) {
        await sender.setMe({ Account: { balance: sender.balance - this.amount - this.fee }, cond: { address: sender.address } })
        let getter = await wo.Account.getOne({ Account: { address: this.toAddress } })
        if (getter) {
          await getter.setMe({ Account: { balance: getter.balance + this.amount }, cond: { address: getter.address } })
        } else {
          await wo.Account.addOne({ Account: { address: this.toAddress } })
        }
        // mylog.info('Excecuted action='+JSON.stringify(this))
        delete DAD.pendingPool[this.hash]
        return this
      }

      // mylog.info('balance('+sender.address+')='+sender.balance+' is less than '+this.amount+', 无法转账')
      return null
    }
  }
}

DAD.pendingPool = {} // 存放所有待签名的多重签名账户交易

/* 为挂起状态的多重签名交易提供查询服务 */
DAD.api.pendingAction = function (option) {
  return DAD.pendingPool[option.id]
}