ditcraft/demo/demo.go

package demo

import (
	"context"
	"errors"
	"fmt"
	"math/big"
	"os"
	"strconv"
	"strings"
	"time"

	"github.com/ditcraft/client/config"
	"github.com/ditcraft/client/git"
	"github.com/ditcraft/client/helpers"
	"github.com/ditcraft/client/smartcontracts/KNWToken"
	"github.com/ditcraft/client/smartcontracts/KNWVoting"
	"github.com/ditcraft/client/smartcontracts/ditDemoCoordinator"
	"github.com/ditcraft/client/smartcontracts/ditToken"
	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/ethclient"
)

const correctETHAddressLength = 42

var demoVoterAddresses = []string{
	"0x0000000000000000000000000000000000000000",
	"0x0000000000000000000000000000000000000000",
	"0x0000000000000000000000000000000000000000",
}
var demoVoterPrivateKeys = []string{
	"0000000000000000000000000000000000000000000000000000000000000000",
	"0000000000000000000000000000000000000000000000000000000000000000",
	"0000000000000000000000000000000000000000000000000000000000000000",
}

// ProposeCommit will start a new proposal on the ditContract of this repository
func ProposeCommit(_commitMessage string) (string, int, error) {
	if !config.DitConfig.PassedKYC {
		passedKYC, err := CheckForKYC()
		if err != nil {
			return "", 0, err
		} else if !passedKYC {
			return "", 0, errors.New("You didn't pass the KYC yet")
		}
	}

	// Searching for this repositories object in the config
	repoIndex, err := searchForRepoInConfig()
	if err != nil {
		return "", 0, err
	}

	repoHash := getHashOfString(config.DitConfig.DemoRepositories[repoIndex].Name)

	// Gathering the the knowledge-labels from the config
	knowledgeLabels := config.DitConfig.DemoRepositories[repoIndex].KnowledgeLabels

	connection, err := getConnection()
	if err != nil {
		return "", 0, err
	}

	// Create a new instance of the ditContract to access it
	ditCoordinatorInstance, err := getDitDemoCoordinatorInstance(connection)
	if err != nil {
		return "", 0, err
	}

	// Create a new instance of the ditToken to access it
	ditTokenInstance, err := getDitTokenInstance(connection)
	if err != nil {
		return "", 0, err
	}

	// Convertig the hex-string-formatted address into address object
	myAddress := common.HexToAddress(config.DitConfig.EthereumKeys.Address)

	// Prompting the user which knowledge-label he wants to use for this proposal
	answerKnowledgeLabel := 0
	userInputString := "Which Knowledge-Label suits this commit most?"
	for i := range knowledgeLabels {
		userInputString += " (" + strconv.Itoa(i+1) + ") " + knowledgeLabels[i]
	}
	for answerKnowledgeLabel < 1 || answerKnowledgeLabel > len(knowledgeLabels) {
		answerKnowledgeLabel, _ = strconv.Atoi(helpers.GetUserInput(userInputString))
	}

	// Retrieving the xDit balance of the user
	xDitBalance, err := ditTokenInstance.BalanceOf(nil, myAddress)
	if err != nil {
		return "", 0, errors.New("Failed to retrieve " + config.DitConfig.Currency + " balance")
	}

	// Formatting the xDit balance to a human-readable format
	floatBalance := new(big.Float).Quo((new(big.Float).SetInt(xDitBalance)), big.NewFloat(1000000000000000000))

	// Prompting the user how much stake he wants to set for this proposal
	answerStake := "0"
	floatStakeParsed, _ := strconv.ParseFloat(answerStake, 64)
	floatStake := big.NewFloat(floatStakeParsed)

	helpers.PrintLine(fmt.Sprintf("You have a balance of %.2f xDit", floatBalance), 0)
	userInputString = fmt.Sprintf("How much do you want to stake?")
	for floatStake.Cmp(big.NewFloat(0)) == 0 || floatStake.Cmp(floatBalance) != -1 {
		answerStake = helpers.GetUserInput(userInputString)
		floatStakeParsed, _ = strconv.ParseFloat(answerStake, 64)
		floatStake = big.NewFloat(floatStakeParsed)
	}

	// Prompting the user whether he is sure of this proposal and its details
	floatStakeString := fmt.Sprintf("%.2f", floatStakeParsed)
	helpers.PrintLine("  Proposing the commit with the following settings:", 0)
	helpers.PrintLine("  Commit Message: "+_commitMessage+"", 0)
	helpers.PrintLine("  Knowledge Label: "+knowledgeLabels[answerKnowledgeLabel-1], 0)
	helpers.PrintLine("  The following stake with automatically be deducted: "+floatStakeString+" xDit", 0)
	userIsSure := helpers.GetUserInputChoice("Is that correct?", "y", "n")
	if userIsSure == "n" {
		return "", 0, errors.New("Canceled proposal of commit due to users choice")
	}
	fmt.Println()

	// Setting the value of the transaction to be the selected stake
	weiFloatStake, _ := (new(big.Float).Mul(floatStake, big.NewFloat(1000000000000000000))).Int64()
	intStake := big.NewInt(weiFloatStake)

	approvedBalance, err := ditTokenInstance.Allowance(nil, myAddress, common.HexToAddress(config.DitConfig.DitCoordinator))
	if err != nil {
		return "", 0, errors.New("Failed to retrieve xDit allowance")
	}

	if approvedBalance.Cmp(intStake) == -1 {
		helpers.PrintLine("Since xDit is a token, we need to set an allowance first", 0)
		// Crerating the transaction (basic values)
		auth, err := populateTx(connection)
		if err != nil {
			return "", 0, err
		}

		_, err = ditTokenInstance.Approve(auth, common.HexToAddress(config.DitConfig.DitCoordinator), xDitBalance)
		if err != nil {
			return "", 0, err
		}

		newAllowance := approvedBalance
		for newAllowance.Cmp(approvedBalance) == 0 {
			newAllowance, err = ditTokenInstance.Allowance(nil, myAddress, common.HexToAddress(config.DitConfig.DitCoordinator))
			if err != nil {
				return "", 0, errors.New("Failed to retrieve xDit allowance")
			}
			time.Sleep(2 * time.Second)
		}
		fmt.Println()
	}

	// Crerating the transaction (basic values)
	auth, err := populateTx(connection)
	if err != nil {
		return "", 0, err
	}

	// Retrieving the last/current proposalID of the ditContract
	// (This will increment after a proposal, so we can see when the proposal is live)
	lastProposalID, err := ditCoordinatorInstance.GetCurrentProposalID(nil, repoHash)
	if err != nil {
		return "", 0, errors.New("Failed to retrieve the current proposal id")
	}

	helpers.PrintLine("Now the actual commit proposal will be executed", 0)

	// Proposing the commit
	transaction, err := ditCoordinatorInstance.ProposeCommit(auth, repoHash, big.NewInt(int64(answerKnowledgeLabel-1)), big.NewInt(int64(120)), big.NewInt(int64(120)), intStake)
	if err != nil {
		if strings.Contains(err.Error(), "insufficient funds") {
			return "", 0, errors.New("Your account doesn't have enough xDai to pay for the transaction")
		}
		return "", 0, err
	}

	// Waiting for the proposals transaction to be mined
	helpers.Printf("Waiting for commit proposal transaction to be mined", 0)
	newProposalID := lastProposalID
	waitingFor := 0
	for newProposalID.Cmp(lastProposalID) == 0 {
		waitingFor += 5
		time.Sleep(5 * time.Second)
		fmt.Printf(".")
		// Checking the current proposal ID every 5 seconds
		newProposalID, err = ditCoordinatorInstance.GetCurrentProposalID(nil, repoHash)
		if err != nil {
			return "", 0, errors.New("Failed to retrieve the current proposal id")
		}
		// If we are waiting for more than 2 minutes, the transaction might have failed
		if waitingFor > 180 {
			fmt.Printf("\n")
			helpers.PrintLine("Waiting for over 3 minutes, maybe the transaction or the network failed?", 1)
			helpers.PrintLine("Check at: https://blockscout.com/poa/dai/tx/"+transaction.Hash().Hex(), 1)
			os.Exit(0)
		}
	}
	fmt.Printf("\n")

	// Gathering the information of the new proposal from the ditContract (including the times to commit and reveal)
	newVote, err := gatherProposalInfo(connection, ditCoordinatorInstance, repoHash, newProposalID.Int64())
	if err != nil {
		return "", 0, err
	}

	// Adding the new vote to the config object
	config.DitConfig.DemoRepositories[repoIndex].ActiveVotes = append(config.DitConfig.DemoRepositories[repoIndex].ActiveVotes, newVote)

	// Saving the config back to the file
	err = config.Save()
	if err != nil {
		return "", 0, err
	}

	// Conwerting the stake and used KNW count into a float so that it's human-readable
	floatETH := new(big.Float).Quo((new(big.Float).SetInt(big.NewInt(int64(newVote.NumTokens)))), big.NewFloat(1000000000000000000))
	floatKNW := new(big.Float).Quo((new(big.Float).SetInt(big.NewInt(int64(newVote.NumKNW)))), big.NewFloat(1000000000000000000))

	// Formatting the time of the commit and reveal phase into a readable format
	timeReveal := time.Unix(int64(newVote.RevealEnd), 0)
	timeRevealString := timeReveal.Format("15:04:05 on 2006/01/02")

	timeCommit := time.Unix(int64(newVote.CommitEnd), 0)
	timeCommitString := timeCommit.Format("15:04:05 on 2006/01/02")

	// Returning the response to the user, we don't want to print this right here and now
	// since we are not sure whether the actual git commands will succeed.
	// So it will be printed afterwards in the main routine
	var responseString string
	responseString += "---------------------------"
	responseString += "\nSuccessfully proposed commit. Vote on proposal started with ID " + strconv.Itoa(int(newVote.ID)) + ""
	responseString += fmt.Sprintf("\nYou staked %.2f %s and used %f KNW", floatETH, config.DitConfig.Currency, floatKNW)
	responseString += "\nThe vote will end at " + timeRevealString
	if config.DitConfig.DemoRepositories[repoIndex].Provider == "github" {
		responseString += "\nYour commit is at https://github.com/" + config.DitConfig.DemoRepositories[repoIndex].Name + "/tree/dit_proposal_" + strconv.Itoa(int(newVote.ID))
	}
	responseString += "\n---------------------------"

	if config.DitConfig.DemoModeActive {
		fmt.Println()
		helpers.PrintLine("Since this is the demo mode, five auto-validators will automatically vote on your proposed commit. You will see the outcome after the vote ended.", 3)
		helpers.PrintLine("All validators now have time to vote on your proposed commit until "+timeCommitString, 3)
		helpers.PrintLine("To finalize the vote, execute '"+helpers.ColorizeCommand("finalize "+strconv.Itoa(int(newVote.ID)))+"' after "+timeRevealString, 3)
		fmt.Println()
	}
	return responseString, int(newProposalID.Int64()), nil
}

// // Vote will cast the demo accounts' votes on a proposal
// func Vote(_proposalID string) error {
// 	if !config.DitConfig.PassedKYC {
// 		passedKYC, err := CheckForKYC()
// 		if err != nil {
// 			return err
// 		} else if !passedKYC {
// 			return errors.New("You didn't pass the KYC yet")
// 		}
// 	}

// 	helpers.PrintLine("Starting demo voters to simulate participants", 3)
// 	for i := 0; i < 3; i++ {
// 		rand.Seed(time.Now().UnixNano())
// 		randomSelection := rand.Intn(2)
// 		randomSalt := rand.Intn(123456789)
// 		err := _executeVote(_proposalID, strconv.Itoa(randomSelection), strconv.Itoa(randomSalt), i)
// 		if err != nil {
// 			helpers.PrintLine("Error during vote commiting of demo voter "+strconv.Itoa(i), 2)
// 		}
// 	}
// 	return nil
// }

// func _executeVote(_proposalID string, _choice string, _salt string, _demoVoter int) error {
// 	// Converting the stdin string input of the user into Ints
// 	proposalID, _ := strconv.Atoi(_proposalID)
// 	choice, _ := strconv.Atoi(_choice)
// 	salt, _ := strconv.Atoi(_salt)

// 	// Searching for this repositories object in the config
// 	ditContractIndex, err := searchForRepoInConfig()
// 	if err != nil {
// 		return err
// 	}

// 	repoHash := getHashOfString(config.DitConfig.DemoRepositories[ditContractIndex].Name)

// 	connection, err := getConnection()
// 	if err != nil {
// 		return err
// 	}

// 	// Convertig the hex-string-formatted address into address object
// 	myAddress := common.HexToAddress(demoVoterAddresses[_demoVoter])

// 	// Create a new instance of the ditContract to access it
// 	ditCoordingatorInstance, err := getDitDemoCoordinatorInstance(connection)
// 	if err != nil {
// 		return err
// 	}

// 	// Create a new instance of the KNWVoting contract to access it
// 	KNWVotingInstance, err := getKNWVotingInstance(connection)
// 	if err != nil {
// 		return err
// 	}

// 	// Searching for the corresponding vote in the votes stored in the config
// 	var voteIndex int
// 	for i := range config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes {
// 		if config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[i].ID == proposalID {
// 			voteIndex = i
// 			break
// 		}
// 	}

// 	// Retrieving the proposal object from the ditContract

// 	proposal, err := ditCoordingatorInstance.ProposalsOfRepository(nil, repoHash, big.NewInt(int64(proposalID)))
// 	if err != nil {
// 		return errors.New("Failed to retrieve proposal")
// 	}

// 	// Verifiying whether the proposal is valid (if KNWVoteID is zero its not valid or non existent)
// 	if proposal.KNWVoteID.Int64() == 0 {
// 		return errors.New("Invalid proposalID")
// 	}

// 	if proposal.Proposer == myAddress {
// 		return errors.New("The demo voter can't vote on his own proposal")
// 	}

// 	// Retrieving the default stake from the ditContract
// 	requiredStake, err := KNWVotingInstance.GetGrossStake(nil, proposal.KNWVoteID)
// 	if err != nil {
// 		return errors.New("Failed to retrieve the required stake of the vote")
// 	}

// 	// In order to create a valid abi-encoded hash of the vote choice and salt
// 	// we need to create an abi object
// 	uint256Type, _ := abi.NewType("uint256")
// 	arguments := abi.Arguments{
// 		{
// 			Type: uint256Type,
// 		},
// 		{
// 			Type: uint256Type,
// 		},
// 	}

// 	// We will now put pack this abi object into a bytearray
// 	bytes, _ := arguments.Pack(
// 		big.NewInt(int64(choice)),
// 		big.NewInt(int64(salt)),
// 	)

// 	// And finally hash this bytearray with keccak256, resulting in the votehash
// 	voteHash := crypto.Keccak256Hash(bytes)

// 	// Verifying whether the commit period of this vote is active
// 	commitPeriodActive, err := KNWVotingInstance.CommitPeriodActive(nil, proposal.KNWVoteID)
// 	if err != nil {
// 		return errors.New("Failed to retrieve opening status")
// 	}

// 	// If it is now active it's probably over
// 	if !commitPeriodActive {
// 		return errors.New("The commit phase of this vote has ended")
// 	}

// 	// Verifying whether the user has already commited a vote on this proposal
// 	oldDidCommit, err := KNWVotingInstance.DidCommit(nil, myAddress, proposal.KNWVoteID)
// 	if err != nil {
// 		return errors.New("Failed to retrieve commit status")
// 	}

// 	// If this is the case, the user can not vote again
// 	if oldDidCommit {
// 		return errors.New("The demo voter already voted on this proposal")
// 	}

// 	var auth *bind.TransactOpts
// 	// Crerating the transaction (basic values)
// 	auth, err = populateTx(connection, demoVoterPrivateKeys[_demoVoter], demoVoterAddresses[_demoVoter])
// 	if err != nil {
// 		return err
// 	}

// 	// Setting the value of the transaction to be the default stake
// 	auth.Value = requiredStake

// 	// Voting on the proposal
// 	_, err = ditCoordingatorInstance.VoteOnProposal(auth, repoHash, big.NewInt(int64(proposalID)), voteHash)
// 	if err != nil {
// 		if strings.Contains(err.Error(), "insufficient funds") {
// 			return errors.New("The demo voters account doesn't have enough ETH to pay for the transaction")
// 		}
// 		return errors.New("Failed to commit the vote: " + err.Error())
// 	}

// 	// We will also store the users choice and salt, so that the user doesn't need to remember the salt
// 	// when he will reveal the vote later on
// 	if _demoVoter == 0 {
// 		config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoChoices = make([]int, 3)
// 		config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoSalts = make([]int, 3)
// 	}
// 	config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoChoices[_demoVoter] = choice
// 	config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoSalts[_demoVoter] = salt

// 	// Saving the config back to the file
// 	err = config.Save()
// 	if err != nil {
// 		return err
// 	}

// 	// Formatting the time of the commit and reveal phase into a readable format
// 	timeCommit := time.Unix(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].CommitEnd), 0)
// 	timeCommitString := timeCommit.Format("15:04:05 on 2006/01/02")
// 	timeReveal := time.Unix(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].RevealEnd), 0)
// 	timeRevealString := timeReveal.Format("15:04:05 on 2006/01/02")

// 	helpers.PrintLine("Demo-Voter "+strconv.Itoa(_demoVoter)+" casted a vote on the proposed commit", 3)
// 	if _demoVoter == 2 {
// 		fmt.Println()
// 		helpers.PrintLine("With dit, votes are casted in a concealed manner through a commitment scheme.", 3)
// 		helpers.PrintLine("This means that votes have to be opened and thus revealed to the public once the commit-phase is over.", 3)
// 		helpers.PrintLine("Please open the concealed demo votes with '"+helpers.ColorizeCommand("demo_open "+strconv.Itoa(int(proposalID)))+"' between "+timeCommitString+" and "+timeRevealString, 3)
// 	}

// 	return nil
// }

// // Open will reveal the demo voters' conceal votes
// func Open(_proposalID string, _demoVoter int) error {
// 	if !config.DitConfig.PassedKYC {
// 		passedKYC, err := CheckForKYC()
// 		if err != nil {
// 			return err
// 		} else if !passedKYC {
// 			return errors.New("You didn't pass the KYC yet")
// 		}
// 	}

// 	// Converting the stdin string input of the user into an int
// 	proposalID, _ := strconv.Atoi(_proposalID)

// 	// Searching for this repositories object in the config
// 	ditContractIndex, err := searchForRepoInConfig()
// 	if err != nil {
// 		return err
// 	}

// 	repoHash := getHashOfString(config.DitConfig.DemoRepositories[ditContractIndex].Name)

// 	connection, err := getConnection()
// 	if err != nil {
// 		return err
// 	}

// 	// Convertig the hex-string-formatted address into an address object
// 	myAddress := common.HexToAddress(demoVoterAddresses[_demoVoter])

// 	// Create a new instance of the ditContract to access it
// 	ditCoordinatorInstance, err := getDitDemoCoordinatorInstance(connection)
// 	if err != nil {
// 		return err
// 	}

// 	// Create a new instance of the KNWVoting contract to access it
// 	KNWVotingInstance, err := getKNWVotingInstance(connection)
// 	if err != nil {
// 		return err
// 	}

// 	// Searching for the corresponding vote in the votes stored in the config
// 	var voteIndex int
// 	for i := range config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes {
// 		if config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[i].ID == proposalID {
// 			voteIndex = i
// 			break
// 		}
// 	}

// 	if len(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoChoices) != 3 || len(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoSalts) != 3 {
// 		return errors.New("No demo voters voted on this vote")
// 	}

// 	// Verifying whether the reveal period of this vote is active
// 	revealPeriodActive, err := KNWVotingInstance.RevealPeriodActive(nil, big.NewInt(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].KNWVoteID)))
// 	if err != nil {
// 		return errors.New("Failed to retrieve opening status")
// 	}

// 	// If it is now active it hasn't started yet or it's over
// 	if !revealPeriodActive {
// 		return errors.New("The opening phase of this vote is not active")
// 	}

// 	// Verifying whether the user has commited a vote on this proposal
// 	didCommit, err := KNWVotingInstance.DidCommit(nil, myAddress, big.NewInt(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].KNWVoteID)))
// 	if err != nil {
// 		return errors.New("Failed to retrieve commit status")
// 	}

// 	// If this is not the case the user never participated in this proposal through a vote
// 	if !didCommit {
// 		return errors.New("The demo voter didn't vote on this proposal")
// 	}

// 	// Verifying whether the user has revealed his vote on this proposal
// 	oldDidReveal, err := KNWVotingInstance.DidReveal(nil, myAddress, big.NewInt(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].KNWVoteID)))
// 	if err != nil {
// 		return errors.New("Failed to retrieve opening status")
// 	}

// 	// If this is the case, the user already revealed his vote
// 	if oldDidReveal {
// 		return errors.New("The demo voter already opened the vote on this proposal")
// 	}

// 	// Crerating the transaction (basic values)
// 	auth, err := populateTx(connection, demoVoterPrivateKeys[_demoVoter], demoVoterAddresses[_demoVoter])
// 	if err != nil {
// 		return err
// 	}

// 	// Gathering the original choice and the salt from the config
// 	choice := big.NewInt(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoChoices[_demoVoter]))
// 	salt := big.NewInt(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoSalts[_demoVoter]))

// 	// Revealing the vote on the proposal
// 	_, err = ditCoordinatorInstance.OpenVoteOnProposal(auth, repoHash, big.NewInt(int64(proposalID)), choice, salt)
// 	if err != nil {
// 		if strings.Contains(err.Error(), "insufficient funds") {
// 			return errors.New("The demo voters account doesn't have enough ETH to pay for the transaction")
// 		}
// 		return errors.New("Failed to open the vote: " + err.Error())
// 	}

// 	var stringChoice string
// 	if config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoChoices[_demoVoter] == 1 {
// 		stringChoice = "for"
// 	} else {
// 		stringChoice = "against"
// 	}
// 	helpers.PrintLine("Demo-Voter "+strconv.Itoa(_demoVoter)+" opened his vote commitment (voted "+stringChoice+" the proposal) ", 3)

// 	if _demoVoter == 2 {
// 		// Formatting the time of the reveal phase into a readable format
// 		timeReveal := time.Unix(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].RevealEnd), 0)
// 		timeRevealString := timeReveal.Format("15:04:05 on 2006/01/02")

// 		helpers.PrintLine("Successfully opened all the concealed demo votes.", 3)
// 		fmt.Println("")
// 		helpers.PrintLine("After the vote ended, the vote has to be finalized. This includes", 3)
// 		helpers.PrintLine("calculating the outcome and distributing KNW tokens and ETH stakes.", 3)
// 		helpers.PrintLine("To do so when the vote is over, execute '"+helpers.ColorizeCommand("finalize "+_proposalID)+"' after "+timeRevealString, 3)
// 	}
// 	return nil
// }

// // Finalize will finalize a demo voters' vote as it will trigger the calculation of the reward
// // of this user including the ETH and KNW reward in case of a voting for the winning decision
// // or the losing of ETH and KNW in case of a voting for the losing decision
// // The first caller who executes this will also trigger the calculation whether the vote passed or not
// func Finalize(_proposalID string) (bool, error) {
// 	if !config.DitConfig.PassedKYC {
// 		passedKYC, err := CheckForKYC()
// 		if err != nil {
// 			return false, err
// 		} else if !passedKYC {
// 			return false, errors.New("You didn't pass the KYC yet")
// 		}
// 	}

// 	// Converting the stdin string input of the user into an int
// 	proposalID, _ := strconv.Atoi(_proposalID)

// 	// Searching for this repositories object in the config
// 	ditContractIndex, err := searchForRepoInConfig()
// 	if err != nil {
// 		return false, err
// 	}

// 	repoHash := getHashOfString(config.DitConfig.DemoRepositories[ditContractIndex].Name)

// 	connection, err := getConnection()
// 	if err != nil {
// 		return false, err
// 	}

// 	// Convertig the hex-string-formatted address into an address object
// 	myAddress := common.HexToAddress(demoVoterAddresses[_demoVoter])

// 	// Create a new instance of the ditContract to access it
// 	ditCoordinatorInstance, err := getDitDemoCoordinatorInstance(connection)
// 	if err != nil {
// 		return false, err
// 	}

// 	// Create a new instance of the KNWVoting contract to access it
// 	KNWVotingInstance, err := getKNWVotingInstance(connection)
// 	if err != nil {
// 		return false, err
// 	}

// 	// Searching for the corresponding vote in the votes stored in the config
// 	var voteIndex int
// 	for i := range config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes {
// 		if config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[i].ID == proposalID {
// 			voteIndex = i
// 			break
// 		}
// 	}

// 	if len(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoChoices) != 3 || len(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].DemoSalts) != 3 {
// 		return false, errors.New("No demo voters voted on this vote")
// 	}

// 	// Verifying whether the vote has already ended
// 	pollEnded, err := KNWVotingInstance.PollEnded(nil, big.NewInt(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].KNWVoteID)))
// 	if err != nil {
// 		return false, errors.New("Failed to retrieve vote status")
// 	}

// 	// If not, we can't resolve it
// 	if !pollEnded {
// 		return false, errors.New("The vote hasn't ended yet")
// 	}

// 	// Verifying whether the user is a participant of this vote
// 	didCommit, err := KNWVotingInstance.DidCommit(nil, myAddress, big.NewInt(int64(config.DitConfig.DemoRepositories[ditContractIndex].ActiveVotes[voteIndex].KNWVoteID)))
// 	if err != nil {
// 		return false, errors.New("Failed to retrieve commit status")
// 	}

// 	// Retrieve the selected proposal obkect
// 	proposal, err := ditCoordinatorInstance.ProposalsOfRepository(nil, repoHash, big.NewInt(int64(proposalID)))
// 	if err != nil {
// 		return false, errors.New("Failed to retrieve the new proposal")
// 	}

// 	// If not, we are not allowed to call this function (it would fail)
// 	if !didCommit && myAddress != proposal.Proposer {
// 		return false, errors.New("The demo voter didn't participate in this vote")
// 	}

// 	// Crerating the transaction (basic values)
// 	auth, err := populateTx(connection, demoVoterPrivateKeys[_demoVoter], demoVoterAddresses[_demoVoter])
// 	if err != nil {
// 		return false, err
// 	}

// 	// Resolving the vote
// 	_, err = ditCoordinatorInstance.FinalizeVote(auth, repoHash, big.NewInt(int64(proposalID)))
// 	if err != nil {
// 		if strings.Contains(err.Error(), "insufficient funds") {
// 			return false, errors.New("The demo voters account doesn't have enough ETH to pay for the transaction")
// 		}
// 		return false, errors.New("Failed to finalize the vote: " + err.Error())
// 	}

// 	helpers.PrintLine("Finalized vote for demo voter "+strconv.Itoa(_demoVoter), 3)

// 	return true, nil
// }

// CheckForKYC will return whether a user has already passed the KYC
func CheckForKYC() (bool, error) {
	connection, err := getConnection()
	if err != nil {
		return false, err
	}

	// Convertig the hex-string-formatted address into an address object
	myAddress := common.HexToAddress(config.DitConfig.EthereumKeys.Address)

	// Create a new instance of the KNWToken to access it
	ditCoordinatorInstance, err := getDitDemoCoordinatorInstance(connection)
	if err != nil {
		return false, err
	}

	passedKYC, err := ditCoordinatorInstance.PassedKYC(nil, myAddress)
	if err != nil {
		return false, err
	}

	if !passedKYC {
		return false, nil
	}

	config.DitConfig.PassedKYC = true

	err = config.Save()
	if err != nil {
		return false, err
	}

	return true, nil
}

// populateTX will set the necessary values for a ethereum transaction
// amount of gas, gasprice, nonce, sign this with the private key
func populateTx(_connection *ethclient.Client) (*bind.TransactOpts, error) {
	// Retrieve the decrypted private key through a password prompt
	var err error
	privateKeyString, err := config.GetPrivateKey()
	if err != nil {
		return nil, err
	}

	// Converting the private key string into a private key object
	privateKey, err := crypto.HexToECDSA(privateKeyString)
	if err != nil {
		return nil, errors.New("Failed to convert ethereum private-key")
	}

	// Retrieving the current pending nonce of our address
	pendingNonce, err := _connection.PendingNonceAt(context.Background(), common.HexToAddress(config.DitConfig.EthereumKeys.Address))
	if err != nil {
		return nil, errors.New("Failed to retrieve nonce for ethereum transaction")
	}
	// Retrieving the current non-pending nonce of our address
	nonpendingNonce, err := _connection.NonceAt(context.Background(), common.HexToAddress(config.DitConfig.EthereumKeys.Address), nil)
	if err != nil {
		return nil, errors.New("Failed to retrieve nonce for ethereum transaction")
	}

	// Edge-Case for slow nodes
	nonce := pendingNonce
	if nonpendingNonce > pendingNonce {
		nonce = nonpendingNonce
	}

	// Retrieving the suggested gasprice by the network
	gasPrice, err := _connection.SuggestGasPrice(context.Background())
	if err != nil {
		return nil, errors.New("Failed to retrieve the gas-price for ethereum transaction")
	}

	// Minimum gas price is 10 gwei for now, which works best for rinkeby
	// Will be changed later on
	defaultGasPrice := big.NewInt(1000000000)
	if gasPrice.Cmp(defaultGasPrice) != 1 {
		gasPrice = defaultGasPrice
	}
	// Setting the values into the transaction-options object
	auth := bind.NewKeyedTransactor(privateKey)
	auth.Nonce = big.NewInt(int64(nonce))

	auth.Value = big.NewInt(0)
	auth.GasLimit = uint64(1000000)
	auth.GasPrice = gasPrice

	return auth, nil
}

func getDitDemoCoordinatorInstance(_connection *ethclient.Client, _ditDemoCoordinatorAddress ...string) (*ditDemoCoordinator.DitDemoCoordinator, error) {
	var ditDemoCoordinatorAddressString string

	if len(_ditDemoCoordinatorAddress) > 0 {
		ditDemoCoordinatorAddressString = _ditDemoCoordinatorAddress[0]
	} else {
		if len(config.DitConfig.DitCoordinator) != correctETHAddressLength {
			return nil, errors.New("Invalid ditDemoCoordinator address, please do '" + helpers.ColorizeCommand("set_coordinator") + "' first")
		}
		ditDemoCoordinatorAddressString = config.DitConfig.DitCoordinator
	}

	// Convertig the hex-string-formatted address into an address object
	ditDemoCoordinatorAddress := common.HexToAddress(ditDemoCoordinatorAddressString)

	// Create a new instance of the ditDemoCoordinator to access it
	ditDemoCoordinatorInstance, err := ditDemoCoordinator.NewDitDemoCoordinator(ditDemoCoordinatorAddress, _connection)
	if err != nil {
		return nil, errors.New("Failed to find ditDemoCoordinator at provided address")
	}

	return ditDemoCoordinatorInstance, nil
}

func getKNWTokenInstance(_connection *ethclient.Client) (*KNWToken.KNWToken, error) {
	KNWTokenAddress := common.HexToAddress(config.DitConfig.KNWToken)

	// Create a new instance of the KNWToken contract to access it
	KNWTokenInstance, err := KNWToken.NewKNWToken(KNWTokenAddress, _connection)
	if err != nil {
		return nil, errors.New("Failed to find KNWToken at provided address")
	}

	return KNWTokenInstance, nil
}

func getKNWVotingInstance(_connection *ethclient.Client) (*KNWVoting.KNWVoting, error) {
	KNWVotingAddress := common.HexToAddress(config.DitConfig.KNWVoting)

	// Create a new instance of the KNWVoting contract to access it
	KNWVotingInstance, err := KNWVoting.NewKNWVoting(KNWVotingAddress, _connection)
	if err != nil {
		return nil, errors.New("Failed to find KNWVoting at provided address")
	}

	return KNWVotingInstance, nil
}

// getConnection will return a connection to the ethereum blockchain
func getConnection() (*ethclient.Client, error) {
	// Connecting to rinkeby via infura
	connection, err := ethclient.Dial("https://sokol.poa.network")
	if err != nil {
		return nil, errors.New("Failed to connect to the ethereum network")
	}

	return connection, nil
}

// searchForRepoInConfig will search for the current repo in the config
func searchForRepoInConfig() (int64, error) {
	// Retrieve the name of the repo we are in from git
	repository, err := git.GetRepository()
	if err != nil {
		return 0, err
	}

	// Search for the repo in our config
	for i := range config.DitConfig.DemoRepositories {
		if config.DitConfig.DemoRepositories[i].Name == repository {
			// Return the index of this repository if it was found
			return int64(i), nil
		}
	}

	// Return an error if nothing was found
	return 0, errors.New("Repository hasn't been initialized")
}

func getHashOfString(_string string) [32]byte {
	repoHash32 := [32]byte{}
	copy(repoHash32[:], crypto.Keccak256([]byte(_string))[:])

	return repoHash32
}

// gatherProposalInfo will retrieve necessary information about a proposal from the ditContract
func gatherProposalInfo(_connection *ethclient.Client, _ditCoordinatorInstance *ditDemoCoordinator.DitDemoCoordinator, _repoHash [32]byte, _proposalID int64) (config.ActiveVote, error) {
	// Retrieve the proposal object from the ditContract
	var newVote config.ActiveVote
	proposal, err := _ditCoordinatorInstance.ProposalsOfRepository(nil, _repoHash, big.NewInt(_proposalID))
	if err != nil {
		return newVote, errors.New("Failed to retrieve the new proposal")
	}

	// Store the information about this vote in an object
	newVote.ID = int(_proposalID)
	newVote.KNWVoteID = int(proposal.KNWVoteID.Int64())
	newVote.KnowledgeLabel = proposal.KnowledgeLabel

	// Create a new instance of the KNWVoting contract to access it
	KNWVotingInstance, err := getKNWVotingInstance(_connection)
	if err != nil {
		return newVote, err
	}

	// Retrieving the information about this vote from the KNWVOting contract itself
	KNWPoll, err := KNWVotingInstance.PollMap(nil, big.NewInt(int64(newVote.KNWVoteID)))
	if err != nil {
		return newVote, errors.New("Failed to retrieve vote information")
	}

	ethereumAddress := config.DitConfig.EthereumKeys.Address

	newVote.CommitEnd = int(KNWPoll.CommitEndDate.Int64())
	newVote.RevealEnd = int(KNWPoll.RevealEndDate.Int64())

	// Retrieving the amount of xDit a user has staked for this vote
	numTokens, err := KNWVotingInstance.GetGrossStake(nil, big.NewInt(int64(newVote.KNWVoteID)))
	if err != nil {
		return newVote, errors.New("Failed to retrieve grossStake")
	}

	// Retrieving the number of votes a user has for this vote
	numVotes, err := KNWVotingInstance.GetNumVotes(nil, common.HexToAddress(ethereumAddress), big.NewInt(int64(newVote.KNWVoteID)))
	if err != nil {
		return newVote, errors.New("Failed to retrieve numVotes")
	}

	// Retrieving the number of KNW tokens a user has staked for this vote
	numKNW, err := KNWVotingInstance.GetNumKNW(nil, common.HexToAddress(ethereumAddress), big.NewInt(int64(newVote.KNWVoteID)))
	if err != nil {
		return newVote, errors.New("Failed to retrieve numKNW")
	}

	newVote.NumTokens = int(numTokens.Int64())
	newVote.NumVotes = int(numVotes.Int64())
	newVote.NumKNW = int(numKNW.Int64())

	return newVote, nil
}

func getDitTokenInstance(_connection *ethclient.Client) (*ditToken.MintableERC20, error) {
	ditTokenAddress := common.HexToAddress(config.DitConfig.DitToken)

	// Create a new instance of the KNWToken contract to access it
	ditTokenInstance, err := ditToken.NewMintableERC20(ditTokenAddress, _connection)
	if err != nil {
		return nil, errors.New("Failed to find ditToken at provided address")
	}

	return ditTokenInstance, nil
}