const Web3 = require('web3')
const ethJSUtil = require('ethereumjs-util')
const processTx = require('./txProcess.js')
const BN = ethJSUtil.BN

class Transactions{
  
  constructor(executionContext) {
    this.executionContext = executionContext
  }

  init (accounts) {
    this.accounts = accounts
  }

  methods () {
    return {
      eth_sendTransaction: this.eth_sendTransaction.bind(this),
      eth_getTransactionReceipt: this.eth_getTransactionReceipt.bind(this),
      eth_getCode: this.eth_getCode.bind(this),
      eth_call: this.eth_call.bind(this),
      eth_estimateGas: this.eth_estimateGas.bind(this),
      eth_getTransactionCount: this.eth_getTransactionCount.bind(this),
      eth_getTransactionByHash: this.eth_getTransactionByHash.bind(this),
      eth_getTransactionByBlockHashAndIndex: this.eth_getTransactionByBlockHashAndIndex.bind(this),
      eth_getTransactionByBlockNumberAndIndex: this.eth_getTransactionByBlockNumberAndIndex.bind(this)
    }
  }

  eth_sendTransaction (payload, cb) {
    // from might be lowercased address (web3)
    if (payload.params && payload.params.length > 0 && payload.params[0].from) {
      payload.params[0].from = ethJSUtil.toChecksumAddress(payload.params[0].from)
    }
    processTx(this.executionContext, this.accounts, payload, false, cb)
  }

  eth_getTransactionReceipt (payload, cb) {
    this.executionContext.web3().eth.getTransactionReceipt(payload.params[0], (error, receipt) => {
      if (error) {
        return cb(error)
      }

      const txBlock = this.executionContext.txs[receipt.hash]

      const r = {
        'transactionHash': receipt.hash,
        'transactionIndex': '0x00',
        'blockHash': '0x' + txBlock.hash().toString('hex'),
        'blockNumber': '0x' + txBlock.header.number.toString('hex'),
        'gasUsed': Web3.utils.toHex(receipt.gas),
        'cumulativeGasUsed': Web3.utils.toHex(receipt.gas),
        'contractAddress': receipt.contractAddress,
        'logs': receipt.logs,
        'status': receipt.status
      }

      if (r.blockNumber === '0x') {
        r.blockNumber = '0x0'
      }

      cb(null, r)
    })
  }

  eth_estimateGas (payload, cb) {
    cb(null, 3000000)
  }

  eth_getCode (payload, cb) {
    let address = payload.params[0]

    this.executionContext.web3().eth.getCode(address, (error, result) => {
      if (error) {
        console.dir('error getting code')
        console.dir(error)
      }
      cb(error, result)
    })
  }

  eth_call (payload, cb) {
    // from might be lowercased address (web3)
    if (payload.params && payload.params.length > 0 && payload.params[0].from) {
      payload.params[0].from = ethJSUtil.toChecksumAddress(payload.params[0].from)
    }
    if (payload.params && payload.params.length > 0 && payload.params[0].to) {
      payload.params[0].to = ethJSUtil.toChecksumAddress(payload.params[0].to)
    }

    payload.params[0].value = undefined

    processTx(this.executionContext, this.accounts, payload, true, cb)
  }

  eth_getTransactionCount (payload, cb) {
    let address = payload.params[0]

    this.executionContext.vm().stateManager.getAccount(address, (err, account) => {
      if (err) {
        return cb(err)
      }
      let nonce = new BN(account.nonce).toString(10)
      cb(null, nonce)
    })
  }

  eth_getTransactionByHash (payload, cb) {
    const address = payload.params[0]

    this.executionContext.web3().eth.getTransactionReceipt(address, (error, receipt) => {
      if (error) {
        return cb(error)
      }

      const txBlock = this.executionContext.txs[receipt.transactionHash]

      // TODO: params to add later
      const r = {
        'blockHash': '0x' + txBlock.hash().toString('hex'),
        'blockNumber': '0x' + txBlock.header.number.toString('hex'),
        'from': receipt.from,
        'gas': Web3.utils.toHex(receipt.gas),
        // 'gasPrice': '2000000000000', // 0x123
        'gasPrice': '0x4a817c800', // 20000000000
        'hash': receipt.transactionHash,
        'input': receipt.input,
        // "nonce": 2, // 0x15
        // "transactionIndex": 0,
        'value': receipt.value
        // "value":"0xf3dbb76162000" // 4290000000000000
        // "v": "0x25", // 37
        // "r": "0x1b5e176d927f8e9ab405058b2d2457392da3e20f328b16ddabcebc33eaac5fea",
        // "s": "0x4ba69724e8f69de52f0125ad8b3c5c2cef33019bac3249e2c0a2192766d1721c"
      }

      if (receipt.to) {
        r.to = receipt.to
      }

      if (r.value === '0x') {
        r.value = '0x0'
      }

      if (r.blockNumber === '0x') {
        r.blockNumber = '0x0'
      }

      cb(null, r)
    })
  }

  eth_getTransactionByBlockHashAndIndex (payload, cb) {
    const txIndex = payload.params[1]

    const txBlock = this.executionContext.blocks[payload.params[0]]
    const txHash = '0x' + txBlock.transactions[Web3.utils.toDecimal(txIndex)].hash().toString('hex')

    this.executionContext.web3().eth.getTransactionReceipt(txHash, (error, receipt) => {
      if (error) {
        return cb(error)
      }

      // TODO: params to add later
      let r = {
        'blockHash': '0x' + txBlock.hash().toString('hex'),
        'blockNumber': '0x' + txBlock.header.number.toString('hex'),
        'from': receipt.from,
        'gas': Web3.utils.toHex(receipt.gas),
        // 'gasPrice': '2000000000000', // 0x123
        'gasPrice': '0x4a817c800', // 20000000000
        'hash': receipt.transactionHash,
        'input': receipt.input,
        // "nonce": 2, // 0x15
        // "transactionIndex": 0,
        'value': receipt.value
        // "value":"0xf3dbb76162000" // 4290000000000000
        // "v": "0x25", // 37
        // "r": "0x1b5e176d927f8e9ab405058b2d2457392da3e20f328b16ddabcebc33eaac5fea",
        // "s": "0x4ba69724e8f69de52f0125ad8b3c5c2cef33019bac3249e2c0a2192766d1721c"
      }

      if (receipt.to) {
        r.to = receipt.to
      }

      if (r.value === '0x') {
        r.value = '0x0'
      }

      cb(null, r)
    })
  }

  eth_getTransactionByBlockNumberAndIndex (payload, cb) {
    const txIndex = payload.params[1]

    const txBlock = this.executionContext.blocks[payload.params[0]]
    const txHash = '0x' + txBlock.transactions[Web3.utils.toDecimal(txIndex)].hash().toString('hex')

    this.executionContext.web3().eth.getTransactionReceipt(txHash, (error, receipt) => {
      if (error) {
        return cb(error)
      }

      // TODO: params to add later
      const r = {
        'blockHash': '0x' + txBlock.hash().toString('hex'),
        'blockNumber': '0x' + txBlock.header.number.toString('hex'),
        'from': receipt.from,
        'gas': Web3.utils.toHex(receipt.gas),
        // 'gasPrice': '2000000000000', // 0x123
        'gasPrice': '0x4a817c800', // 20000000000
        'hash': receipt.transactionHash,
        'input': receipt.input,
        // "nonce": 2, // 0x15
        // "transactionIndex": 0,
        'value': receipt.value
        // "value":"0xf3dbb76162000" // 4290000000000000
        // "v": "0x25", // 37
        // "r": "0x1b5e176d927f8e9ab405058b2d2457392da3e20f328b16ddabcebc33eaac5fea",
        // "s": "0x4ba69724e8f69de52f0125ad8b3c5c2cef33019bac3249e2c0a2192766d1721c"
      }

      if (receipt.to) {
        r.to = receipt.to
      }

      if (r.value === '0x') {
        r.value = '0x0'
      }

      cb(null, r)
    })
  }
}

module.exports = Transactions