/*global ethereum, MetamaskOnboarding, web3 */

/*
The `piggybankContract` is compiled from:

  pragma solidity ^0.4.0;
  contract PiggyBank {

      uint private balance;
      address public owner;

      function PiggyBank() public {
          owner = msg.sender;
          balance = 0;
      }

      function deposit() public payable returns (uint) {
          balance += msg.value;
          return balance;
      }

      function withdraw(uint withdrawAmount) public returns (uint remainingBal) {
          require(msg.sender == owner);
          balance -= withdrawAmount;

          msg.sender.transfer(withdrawAmount);

          return balance;
      }
  }
*/

const forwarderOrigin = 'http://localhost:9010'

const isMetaMaskInstalled = () => {
  return Boolean(window.ethereum && window.ethereum.isMetaMask)
}

const initialize = () => {
  const onboardButton = document.getElementById('connectButton')
  const deployButton = document.getElementById('deployButton')
  const depositButton = document.getElementById('depositButton')
  const withdrawButton = document.getElementById('withdrawButton')
  const sendButton = document.getElementById('sendButton')
  const createToken = document.getElementById('createToken')
  const transferTokens = document.getElementById('transferTokens')
  const approveTokens = document.getElementById('approveTokens')
  const transferTokensWithoutGas = document.getElementById('transferTokensWithoutGas')
  const approveTokensWithoutGas = document.getElementById('approveTokensWithoutGas')
  const signTypedData = document.getElementById('signTypedData')
  const signTypedDataResults = document.getElementById('signTypedDataResult')
  const getAccountsButton = document.getElementById('getAccounts')
  const getAccountsResults = document.getElementById('getAccountsResult')

  const contractStatus = document.getElementById('contractStatus')
  const tokenAddress = document.getElementById('tokenAddress')
  const networkDiv = document.getElementById('network')
  const chainIdDiv = document.getElementById('chainId')
  const accountsDiv = document.getElementById('accounts')

  let onboarding
  try {
    onboarding = new MetamaskOnboarding({ forwarderOrigin })
  } catch (error) {
    console.error(error)
  }
  let accounts
  let piggybankContract

  const accountButtons = [
    deployButton,
    depositButton,
    withdrawButton,
    sendButton,
    createToken,
    transferTokens,
    approveTokens,
    transferTokensWithoutGas,
    approveTokensWithoutGas,
    signTypedData,
  ]

  const isMetaMaskConnected = () => accounts && accounts.length > 0

  const onClickInstall = () => {
    onboardButton.innerText = 'Onboarding in progress'
    onboardButton.disabled = true
    onboarding.startOnboarding()
  }

  const onClickConnect = async () => {
    await window.ethereum.enable()
  }

  const updateButtons = () => {
    const accountButtonsDisabled = !isMetaMaskInstalled() || !isMetaMaskConnected()
    if (accountButtonsDisabled) {
      for (const button of accountButtons) {
        button.disabled = true
      }
    } else {
      deployButton.disabled = false
      sendButton.disabled = false
      createToken.disabled = false
      signTypedData.disabled = false
    }

    if (!isMetaMaskInstalled()) {
      onboardButton.innerText = 'Click here to install MetaMask!'
      onboardButton.onclick = onClickInstall
      onboardButton.disabled = false
    } else if (isMetaMaskConnected()) {
      onboardButton.innerText = 'Connected'
      onboardButton.disabled = true
      if (onboarding) {
        onboarding.stopOnboarding()
      }
    } else {
      onboardButton.innerText = 'Connect'
      onboardButton.onclick = onClickConnect
      onboardButton.disabled = false
    }
  }

  const initializeAccountButtons = () => {
    piggybankContract = web3.eth.contract([{ 'constant': false, 'inputs': [{ 'name': 'withdrawAmount', 'type': 'uint256' }], 'name': 'withdraw', 'outputs': [{ 'name': 'remainingBal', 'type': 'uint256' }], 'payable': false, 'stateMutability': 'nonpayable', 'type': 'function' }, { 'constant': true, 'inputs': [], 'name': 'owner', 'outputs': [{ 'name': '', 'type': 'address' }], 'payable': false, 'stateMutability': 'view', 'type': 'function' }, { 'constant': false, 'inputs': [], 'name': 'deposit', 'outputs': [{ 'name': '', 'type': 'uint256' }], 'payable': true, 'stateMutability': 'payable', 'type': 'function' }, { 'inputs': [], 'payable': false, 'stateMutability': 'nonpayable', 'type': 'constructor' }])
    deployButton.onclick = async () => {
      contractStatus.innerHTML = 'Deploying'

      const piggybank = await piggybankContract.new(
        {
          from: accounts[0],
          data: '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',
          gas: '4700000',
        }, (error, contract) => {
          if (error) {
            contractStatus.innerHTML = 'Deployment Failed'
            throw error
          } else if (contract.address === undefined) {
            return
          }

          console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash)
          contractStatus.innerHTML = 'Deployed'
          depositButton.disabled = false
          withdrawButton.disabled = false

          depositButton.onclick = () => {
            contractStatus.innerHTML = 'Deposit initiated'
            contract.deposit(
              {
                from: accounts[0],
                value: '0x3782dace9d900000',
              },
              (result) => {
                console.log(result)
                contractStatus.innerHTML = 'Deposit completed'
              }
            )
          }
          withdrawButton.onclick = () => {
            contract.withdraw(
              '0xde0b6b3a7640000',
              { from: accounts[0] },
              (result) => {
                console.log(result)
                contractStatus.innerHTML = 'Withdrawn'
              }
            )
          }
        }
      )
      console.log(piggybank)
    }

    sendButton.onclick = () => {
      web3.eth.sendTransaction({
        from: accounts[0],
        to: '0x2f318C334780961FB129D2a6c30D0763d9a5C970',
        value: '0x29a2241af62c0000',
        gas: 21000,
        gasPrice: 20000000000,
      }, (result) => {
        console.log(result)
      })
    }

    createToken.onclick = async () => {
      const _initialAmount = 100
      const _tokenName = 'TST'
      const _decimalUnits = 0
      const _tokenSymbol = 'TST'
      const humanstandardtokenContract = web3.eth.contract([{ 'constant': true, 'inputs': [], 'name': 'name', 'outputs': [{ 'name': '', 'type': 'string' }], 'payable': false, 'stateMutability': 'view', 'type': 'function' }, { 'constant': false, 'inputs': [{ 'name': '_spender', 'type': 'address' }, { 'name': '_value', 'type': 'uint256' }], 'name': 'approve', 'outputs': [{ 'name': 'success', 'type': 'bool' }], 'payable': false, 'stateMutability': 'nonpayable', 'type': 'function' }, { 'constant': true, 'inputs': [], 'name': 'totalSupply', 'outputs': [{ 'name': '', 'type': 'uint256' }], 'payable': false, 'stateMutability': 'view', 'type': 'function' }, { 'constant': false, 'inputs': [{ 'name': '_from', 'type': 'address' }, { 'name': '_to', 'type': 'address' }, { 'name': '_value', 'type': 'uint256' }], 'name': 'transferFrom', 'outputs': [{ 'name': 'success', 'type': 'bool' }], 'payable': false, 'stateMutability': 'nonpayable', 'type': 'function' }, { 'constant': true, 'inputs': [], 'name': 'decimals', 'outputs': [{ 'name': '', 'type': 'uint8' }], 'payable': false, 'stateMutability': 'view', 'type': 'function' }, { 'constant': true, 'inputs': [], 'name': 'version', 'outputs': [{ 'name': '', 'type': 'string' }], 'payable': false, 'stateMutability': 'view', 'type': 'function' }, { 'constant': true, 'inputs': [{ 'name': '_owner', 'type': 'address' }], 'name': 'balanceOf', 'outputs': [{ 'name': 'balance', 'type': 'uint256' }], 'payable': false, 'stateMutability': 'view', 'type': 'function' }, { 'constant': true, 'inputs': [], 'name': 'symbol', 'outputs': [{ 'name': '', 'type': 'string' }], 'payable': false, 'stateMutability': 'view', 'type': 'function' }, { 'constant': false, 'inputs': [{ 'name': '_to', 'type': 'address' }, { 'name': '_value', 'type': 'uint256' }], 'name': 'transfer', 'outputs': [{ 'name': 'success', 'type': 'bool' }], 'payable': false, 'stateMutability': 'nonpayable', 'type': 'function' }, { 'constant': false, 'inputs': [{ 'name': '_spender', 'type': 'address' }, { 'name': '_value', 'type': 'uint256' }, { 'name': '_extraData', 'type': 'bytes' }], 'name': 'approveAndCall', 'outputs': [{ 'name': 'success', 'type': 'bool' }], 'payable': false, 'stateMutability': 'nonpayable', 'type': 'function' }, { 'constant': true, 'inputs': [{ 'name': '_owner', 'type': 'address' }, { 'name': '_spender', 'type': 'address' }], 'name': 'allowance', 'outputs': [{ 'name': 'remaining', 'type': 'uint256' }], 'payable': false, 'stateMutability': 'view', 'type': 'function' }, { 'inputs': [{ 'name': '_initialAmount', 'type': 'uint256' }, { 'name': '_tokenName', 'type': 'string' }, { 'name': '_decimalUnits', 'type': 'uint8' }, { 'name': '_tokenSymbol', 'type': 'string' }], 'payable': false, 'stateMutability': 'nonpayable', 'type': 'constructor' }, { 'payable': false, 'stateMutability': 'nonpayable', 'type': 'fallback' }, { 'anonymous': false, 'inputs': [{ 'indexed': true, 'name': '_from', 'type': 'address' }, { 'indexed': true, 'name': '_to', 'type': 'address' }, { 'indexed': false, 'name': '_value', 'type': 'uint256' }], 'name': 'Transfer', 'type': 'event' }, { 'anonymous': false, 'inputs': [{ 'indexed': true, 'name': '_owner', 'type': 'address' }, { 'indexed': true, 'name': '_spender', 'type': 'address' }, { 'indexed': false, 'name': '_value', 'type': 'uint256' }], 'name': 'Approval', 'type': 'event' }])

      return humanstandardtokenContract.new(
        _initialAmount,
        _tokenName,
        _decimalUnits,
        _tokenSymbol,
        {
          from: accounts[0],
          data: '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',
          gas: '4700000',
          gasPrice: '20000000000',
        }, (error, contract) => {
          if (error) {
            tokenAddress.innerHTML = 'Creation Failed'
            throw error
          } else if (contract.address === undefined) {
            return
          }

          console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash)
          tokenAddress.innerHTML = contract.address
          transferTokens.disabled = false
          approveTokens.disabled = false
          transferTokensWithoutGas.disabled = false
          approveTokensWithoutGas.disabled = false

          transferTokens.onclick = (event) => {
            console.log(`event`, event)
            contract.transfer('0x2f318C334780961FB129D2a6c30D0763d9a5C970', '15000', {
              from: accounts[0],
              to: contract.address,
              data: '0xa9059cbb0000000000000000000000002f318c334780961fb129d2a6c30d0763d9a5c9700000000000000000000000000000000000000000000000000000000000003a98',
              gas: 60000,
              gasPrice: '20000000000',
            }, (result) => {
              console.log('result', result)
            })
          }

          approveTokens.onclick = () => {
            contract.approve('0x9bc5baF874d2DA8D216aE9f137804184EE5AfEF4', '70000', {
              from: accounts[0],
              to: contract.address,
              data: '0x095ea7b30000000000000000000000009bc5baF874d2DA8D216aE9f137804184EE5AfEF40000000000000000000000000000000000000000000000000000000000000005',
              gas: 60000,
              gasPrice: '20000000000',
            }, (result) => {
              console.log(result)
            })
          }

          transferTokensWithoutGas.onclick = (event) => {
            console.log(`event`, event)
            contract.transfer('0x2f318C334780961FB129D2a6c30D0763d9a5C970', '15000', {
              from: accounts[0],
              to: contract.address,
              data: '0xa9059cbb0000000000000000000000002f318c334780961fb129d2a6c30d0763d9a5c9700000000000000000000000000000000000000000000000000000000000003a98',
              gasPrice: '20000000000',
            }, (result) => {
              console.log('result', result)
            })
          }

          approveTokensWithoutGas.onclick = () => {
            contract.approve('0x2f318C334780961FB129D2a6c30D0763d9a5C970', '70000', {
              from: accounts[0],
              to: contract.address,
              data: '0x095ea7b30000000000000000000000002f318C334780961FB129D2a6c30D0763d9a5C9700000000000000000000000000000000000000000000000000000000000000005',
              gasPrice: '20000000000',
            }, (result) => {
              console.log(result)
            })
          }
        }
      )
    }

    signTypedData.addEventListener('click', () => {
      const networkId = parseInt(networkDiv.innerHTML)
      const chainId = parseInt(chainIdDiv.innerHTML) || networkId

      const typedData = {
        types: {
          EIP712Domain: [
            { name: 'name', type: 'string' },
            { name: 'version', type: 'string' },
            { name: 'chainId', type: 'uint256' },
            { name: 'verifyingContract', type: 'address' },
          ],
          Person: [
            { name: 'name', type: 'string' },
            { name: 'wallet', type: 'address' },
          ],
          Mail: [
            { name: 'from', type: 'Person' },
            { name: 'to', type: 'Person' },
            { name: 'contents', type: 'string' },
          ],
        },
        primaryType: 'Mail',
        domain: {
          name: 'Ether Mail',
          version: '1',
          chainId,
          verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
        },
        message: {
          sender: {
            name: 'Cow',
            wallet: '0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826',
          },
          recipient: {
            name: 'Bob',
            wallet: '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
          },
          contents: 'Hello, Bob!',
        },
      }
      web3.currentProvider.sendAsync({
        method: 'eth_signTypedData_v3',
        params: [ethereum.selectedAddress, JSON.stringify(typedData)],
        from: ethereum.selectedAddress,
      }, (err, result) => {
        if (err) {
          console.log(err)
        } else {
          signTypedDataResults.innerHTML = JSON.stringify(result)
        }
      })
    })

    getAccountsButton.addEventListener('click', async () => {
      try {
        const accounts = await ethereum.send({ method: 'eth_accounts' })
        getAccountsResults.innerHTML = accounts[0] || 'Not able to get accounts'
      } catch (error) {
        console.error(error)
        getAccountsResults.innerHTML = `Error: ${error}`
      }
    })

  }

  updateButtons()
  if (isMetaMaskInstalled()) {
    ethereum.autoRefreshOnNetworkChange = false
    ethereum.on('networkChanged', (networkId) => {
      networkDiv.innerHTML = networkId
    })
    ethereum.on('chainIdChanged', (chainId) => {
      chainIdDiv.innerHTML = chainId
    })
    ethereum.on('accountsChanged', (newAccounts) => {
      const connecting = Boolean((!accounts || !accounts.length) && newAccounts && newAccounts.length)
      accounts = newAccounts
      accountsDiv.innerHTML = accounts
      if (connecting) {
        initializeAccountButtons()
      }
      updateButtons()
    })
  }
}
window.addEventListener('DOMContentLoaded', initialize)