import { singleton } from '@/decorators/singleton.decorator'
import { Blockchain } from '@/chain/blockchain'
import { getNonce } from '@/api/User'
import { AppModule } from '@/store/modules/app'
import { UserModule } from '@/store/modules/user'
import { Message } from 'element-ui'
import { Chain } from '@/chain/Chain'
import { AVAILABLE_CHAINS, IChainData } from '@/configs/config_chain'
import { AllChains } from '@/configs/allchain'

@singleton
export default class ChainManager {
  bc: Blockchain
  instanceMap: Map<string, any>
  public chainMap: Map<number, IChainData> = new Map()
  private _availableChains: Map<number, IChainData> = new Map()

  constructor() {
    this.bc = new Blockchain()
    this.instanceMap = new Map()
    for (const data of AllChains) {
      this.chainMap.set(data.id, data)
    }
  }

  get availableChains() {
    if (this._availableChains.size === 0) {
      for (const id of AVAILABLE_CHAINS) {
        const d = this.chainMap.get(id)
        if (d) {
          this._availableChains.set(id, d)
        }
      }
    }
    return this._availableChains
  }

  public async init() {
    if (this.bc.isWalletConnect) {
      try {
        await this.bc.connect()
        await this.getNance()
      } catch (err) {
        console.log('connect chain error: ', err)
      }
    }
  }

  get isLogined() {
    return !!UserModule.token && !!AppModule.step
  }

  public async logout() {
    await this.bc.disconnect()
  }

  public async login() {
    if (!AppModule.step) {
      try {
        await this.bc.connect(true)
        await this.checkNance()
      } catch (err) {
        Message({
          message: err.message,
          type: 'error',
          duration: 5 * 1000
        })
        await Promise.reject(err)
      }
    }
  }

  public async checkNance() {
    try {
      let nonce = AppModule.nonce
      if (!nonce) {
        const preRequest: any = await getNonce({
          account: AppModule.accountId,
          net_id: AppModule.chainId
        })
        nonce = preRequest.nonce + ''
      }

      await UserModule.Login({
        bcInstance: this.bc,
        account: AppModule.accountId,
        chainId: AppModule.chainId,
        nonce
      })
      AppModule.updateStep(1)
    } catch (err) {
      console.log(err)
      await Promise.reject(err)
    }
  }

  public async getNance() {
    console.log('need get nance')
    try {
      const preRequest: any = await getNonce({
        account: AppModule.accountId,
        net_id: AppModule.chainId
      })
      console.log('success get nonce: ', preRequest)
      // if need check sign and has nonce val, store it
      if (preRequest.state) {
        AppModule.updateStep(1)
      } else if (!preRequest.state && preRequest.nonce) {
        if (UserModule.token) {
          await UserModule.LogOut()
        }
        AppModule.updateStep(0)
        AppModule.updateNonce(preRequest.nonce + '')
      }
    } catch (err) {
      Message({
        message: 'Error get login nonce',
        type: 'error',
        duration: 5 * 1000
      })
    }
  }

  public async getInstance(address: string, chainId: number) {
    const key = `${chainId}_${address}`
    if (!this.instanceMap.has(key)) {
      const chain = new Chain(this.chainMap.get(chainId)!.rpc)
      const coinInstance = await chain.getCoinInstance(address)
      this.instanceMap.set(key, coinInstance)
    }
    return this.instanceMap.get(key)
  }

  public async getBalance(address: string, chainId: number) {
    const coinInstance = await this.getInstance(address, chainId)
    const balance = await coinInstance.methods.balanceOf(AppModule.accountId).call()
    console.log('balance: ', balance)
    return balance
  }

  // 转账
  public async transferToAccount({ to, amount, chainId, address } : {
    to: string
    amount: number
    chainId: number
    address: string}) {
    const self = this
    if (chainId !== this.bc.currentChain) {
      return new Promise((resolve, reject) => {
        this.bc.switchEthereumChain(chainId, function() {
          self.bc.transferToAccount(to, amount, address)
            .then(res => {
              resolve && resolve(res)
            })
            .catch(err => {
              reject && reject(err)
            })
        })
      })
    } else {
      return this.bc.transferToAccount(to, amount, address)
    }
  }
}