import assert from 'assert'

import { ethers, utils } from 'ethers'

const { getAddress } = utils

type ProxyConfig = {
  targetImplAddress: string
  targetProxyOwnerAddress: string
  postUpgradeCallCalldata?: string
}

// Sets up the newly deployed proxy contract such that:
// 1. The proxy's implementation is set to the target implementation
// 2. The proxy's admin is set to the target proxy owner
//
// If the values are set correctly already, it makes no transactions.

const setupProxyContract = async (
  proxyContract: ethers.Contract,
  signer: ethers.Signer,
  {
    targetImplAddress,
    targetProxyOwnerAddress,
    postUpgradeCallCalldata,
  }: ProxyConfig
) => {
  const currentAdmin = await proxyContract
    .connect(ethers.constants.AddressZero)
    .callStatic.admin()

  const signerAddress = await signer.getAddress()

  // Gets the current implementation address the proxy is pointing to.
  // callStatic is used since the `Proxy.implementation()` is not a view function and ethers will
  // try to make a transaction if we don't use callStatic. Using the zero address as `from` lets us
  // call functions on the proxy and not trigger the delegatecall. See Proxy.sol proxyCallIfNotAdmin
  // modifier for more details.
  const currentImplementation = await proxyContract
    .connect(ethers.constants.AddressZero)
    .callStatic.implementation()
  console.log(`implementation currently set to ${currentImplementation}`)

  if (getAddress(currentImplementation) !== getAddress(targetImplAddress)) {
    // If the proxy isn't pointing to the correct implementation, we need to set it to the correct
    // one, then call initialize() in the proxy's context.

    console.log('implementation not set to correct contract')
    console.log(`Setting implementation to ${targetImplAddress}`)

    // The signer needs to be the current admin, otherwise we don't have permission
    // to update the implementation or admin
    assert(
      signerAddress === currentAdmin,
      'the passed signer is not the admin, cannot update implementation'
    )

    let tx: ethers.providers.TransactionResponse
    if (!postUpgradeCallCalldata) {
      console.log(
        'postUpgradeCallCalldata is not provided. Using Proxy.upgrade()'
      )
      // Point the proxy to the target implementation
      tx = await proxyContract.connect(signer).upgradeTo(targetImplAddress)
    } else {
      console.log(
        'postUpgradeCallCalldata is provided. Using Proxy.upgradeAndCall()'
      )
      // Point the proxy to the target implementation,
      // and call function in the proxy's context
      tx = await proxyContract
        .connect(signer)
        .upgradeToAndCall(targetImplAddress, postUpgradeCallCalldata)
    }

    const receipt = await tx.wait()

    console.log(`implementation set in ${receipt.transactionHash}`)
  } else {
    console.log(`implementation already set correctly to ${targetImplAddress}`)
  }

  console.log(`admin set to ${currentAdmin}`)
  if (getAddress(currentAdmin) !== getAddress(targetProxyOwnerAddress)) {
    // If the proxy admin isn't the l2ProxyOwnerAddress, we need to update it
    // We're assuming that the proxy admin is the ddd right now.

    console.log('detected admin is not set correctly')
    console.log(`Setting admin to ${targetProxyOwnerAddress}`)

    // The signer needs to be the current admin, otherwise we don't have permission
    // to update the implementation or admin
    assert(
      signerAddress === currentAdmin,
      'proxyOwnerSigner is not the admin, cannot update admin'
    )

    // change admin to the l2ProxyOwnerAddress
    const tx = await proxyContract
      .connect(signer)
      .changeAdmin(targetProxyOwnerAddress)

    const receipt = await tx.wait()

    console.log(`admin set in ${receipt.transactionHash}`)
  } else {
    console.log(`admin already set correctly to ${targetProxyOwnerAddress}`)
  }

  const updatedImplementation = await proxyContract
    .connect(ethers.constants.AddressZero)
    .callStatic.implementation()

  const updatedAdmin = await proxyContract
    .connect(ethers.constants.AddressZero)
    .callStatic.admin()

  assert(
    getAddress(updatedAdmin) === getAddress(targetProxyOwnerAddress),
    'Something went wrong - admin not set correctly after transaction'
  )
  assert(
    getAddress(updatedImplementation) === getAddress(targetImplAddress),
    'Something went wrong - implementation not set correctly after transaction'
  )

  console.log(
    `Proxy at ${proxyContract.address} is set up with implementation: ${updatedImplementation} and admin: ${updatedAdmin}`
  )
}

export { setupProxyContract }