Add Cardano chain

README.md

@@ -16,6 +16,7 @@ we simply calculate:
 nakamoto-coefficient: no of validators controlling 33% of the total network stake
 ```
 
+Note that the threshold may be different for some blockchains, for example, 50%.
 So, I would suggest users to understand the context, cross-verify and examine the results. For any feedback, please join this [discord](https://discord.gg/Una8qmFg).
 
 ### Programming Languages
@@ -61,6 +62,7 @@ NOTE: You can get your API Key by signing up [here](https://www.validators.app/u
 20. [MultiversX](https://multiversx.com/)
 21. [Polkadot](https://polkadot.network/)
 22. [Aptos](https://aptosfoundation.org/)
+23. [Cardano](https://cardano.org/)
 
 ### Notes
 

core/chains/cardano.go

@@ -0,0 +1,75 @@
+package chains
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"math/big"
+	"net/http"
+	"sort"
+
+	utils "github.com/xenowits/nakamoto-coefficient-calculator/core/utils"
+)
+
+type CardanoResponse struct {
+	Label string  `json:"label"`
+	Class string  `json:"class"`
+	Epoch int     `json:"epoch"`
+	Stake float64 `json:"stake"`
+}
+
+func Cardano() (int, error) {
+	url := "https://www.balanceanalytics.io/api/mavdata.json"
+
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		log.Println("Error creating request:", err)
+		return 0, err
+	}
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		log.Println("Error making request:", err)
+		return 0, err
+	}
+	defer resp.Body.Close()
+
+	var responseData []struct {
+		CardanoResponse []CardanoResponse `json:"mav_data"`
+	}
+	err = json.NewDecoder(resp.Body).Decode(&responseData)
+	if err != nil {
+		log.Println("Error decoding JSON:", err)
+		return 0, err
+	}
+
+	var votingPowers []big.Int
+	for _, data := range responseData {
+		for _, mavData := range data.CardanoResponse {
+			stakeInt := big.NewInt(int64(mavData.Stake))
+			votingPowers = append(votingPowers, *stakeInt)
+		}
+	}
+
+	// need to sort the powers in descending order since they are in random order
+	sort.Slice(votingPowers, func(i, j int) bool {
+		res := (&votingPowers[i]).Cmp(&votingPowers[j])
+		if res == 1 {
+			return true
+		}
+		return false
+	})
+
+	// Calculate total voting power
+	totalVotingPower := utils.CalculateTotalVotingPowerBigNums(votingPowers)
+
+	// Calculate Nakamoto coefficient
+	nakamotoCoefficient := utils.CalcNakamotoCoefficientBigNums51(totalVotingPower, votingPowers)
+
+	fmt.Println("Total voting power:", totalVotingPower)
+	fmt.Println("The Nakamoto coefficient for Cardano is", nakamotoCoefficient)
+
+	// Return Nakamoto coefficient
+	return nakamotoCoefficient, nil
+}

core/chains/chain.go

@@ -21,6 +21,7 @@ type ChainState map[Token]Chain
 
 // Append new chains in alphabetical order only.
 const (
+	ADA   Token = "ADA"
 	ALGO  Token = "ALGO"
 	APT   Token = "APT"
 	ATOM  Token = "ATOM"
@@ -48,6 +49,8 @@ const (
 // ChainName returns the name of the chain given the token name.
 func (t Token) ChainName() string {
 	switch t {
+	case ADA:
+		return "Cardano"
 	case ALGO:
 		return "Algo"
 	case APT:
@@ -97,7 +100,7 @@ func (t Token) ChainName() string {
 	}
 }
 
-var Tokens = []Token{ALGO, APT, ATOM, AVAX, BLD, BNB, DOT, EGLD, GRT, HBAR, JUNO, MATIC, MINA, NEAR, OSMO, PLS, REGEN, RUNE, SOL, STARS, SUI, TIA}
+var Tokens = []Token{ADA, ALGO, APT, ATOM, AVAX, BLD, BNB, DOT, EGLD, GRT, HBAR, JUNO, MATIC, MINA, NEAR, OSMO, PLS, REGEN, RUNE, SOL, STARS, SUI, TIA}
 
 // NewState returns a new fresh state.
 func NewState() ChainState {
@@ -131,6 +134,8 @@ func newValues(token Token) (int, error) {
 	)
 
 	switch token {
+	case ADA:
+		currVal, err = Cardano()
 	case ALGO:
 		currVal, err = Algorand()
 	case APT:

core/utils/calc_nakamoto_coefficient_big_nums.go

@@ -26,3 +26,21 @@ func CalcNakamotoCoefficientBigNums(totalVotingPower *big.Int, votingPowers []bi
 
 	return nakamotoCoefficient
 }
+
+func CalcNakamotoCoefficientBigNums51(totalVotingPower *big.Int, votingPowers []big.Int) int {
+	thresholdPercent := big.NewFloat(0.50)
+	thresholdVal := new(big.Float).Mul(new(big.Float).SetInt(totalVotingPower), thresholdPercent)
+	cumulativeVal := big.NewFloat(0.00)
+	nakamotoCoefficient := 0
+
+	for _, vp := range votingPowers {
+		z := new(big.Float).Add(cumulativeVal, new(big.Float).SetInt(&vp))
+		cumulativeVal = z
+		nakamotoCoefficient += 1
+		if cumulativeVal.Cmp(thresholdVal) == +1 {
+			break
+		}
+	}
+
+	return nakamotoCoefficient
+}