信任评分 Snap：用代码颜色简化交易

type ScoreResult = {
  score: number;
  description: string;
};

const onTransaction: OnTransactionHandler = async ({
  transaction,
  chainId,
}) => {
  // call all the insights criteria
  // they all return a ScoreResult
}
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/**
 * Gets a trust score for a contract based on the overall tx count
 * 3 -> the contract had overall >=100 txs
 * 2 -> the contract had overall 50 <= tx < 99
 * 1 -> the contract had overall tx < 50
 *
 *@param options0
 * @param options0.chainId - the chain id to call the api with
 * @param options0.contractAddress - the contract address to check
 * @returns the score and a description
 */
export async function getContractTransactionCountScore({
  chainId,
  contractAddress,
}: IContractTransactionCountScore): Promise<ScoreResult> {
  // get the api url asking for the 100th transaction
  // it will return undefined if there is none
  const url100 = getEtherscanContractTxsUrl({
    txNumber: 100,
    chainId,
    contractAddress,
  });
  const { result: result100 } = await fetchUrl<EtherscanResponse>(url100);

  // if there is a 100th tx it means the contract
  // has received at least 100 txs. We have all we need
  // we can return with the best score of 3
  if (result100.length === 1) {
    return {
      score: 3,
      description: 'more than 100 txs',
    };
  }

  // this will be call if there are less than 100 txs
  // we check if there is a 50th tx.
  const url50 = getEtherscanContractTxsUrl({
    txNumber: 50,
    chainId,
    contractAddress,
  });
  const { result: result50 } = await fetchUrl<EtherscanResponse>(url50);

  // if there is a 50th tx we can return with a score of 2
  if (result50.length === 1) {
    return {
      score: 2,
      description: 'more than 50 txs',
    };
  }

  // otherwise, return with the lowest score
  return {
    score: 1,
    description: 'fewer than 50 txs',
  };
}
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// arbitrary weight for each score
const Weights = {
  contractTransactionCountScore: 3,
  contractAgeScore: 2,
  contractVerificationScore: 1,
  contractUserTransactionScore: 1,
};

// calculate the overall trust score after applying the weights
const calculateOverallScoreWithWeight = ({
  contractTransactionCountScore,
  contractUserTransactionScore,
  contractAgeScore,
  contractVerificationScore,
}: CalculateOverallScoreWithWeightArgs) => {
  const totalWeitght = Object.values(Weights).reduce(
    (acc: number, curr: number) => acc + curr,
    0,
  );

  const overallScoreWithWeight =
    (contractUserTransactionScore.score * Weights.contractUserTransactionScore +
      contractTransactionCountScore.score *
        Weights.contractTransactionCountScore +
      contractAgeScore.score * Weights.contractAgeScore +
      contractVerificationScore.score * Weights.contractVerificationScore) /
    totalWeitght;

  return Math.floor(overallScoreWithWeight);
};
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const getColor = (result: number) => {
  switch (result) {
    case 3:
      return '🟩';
    case 2:
      return '🟧';
    default:
      return '🟥';
  }
};
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return {
    insights: {
      '': `Trust score: ${getColor(overallScore)}`,
      ' ': '-----------------------------',
      'Contract popularity': `${getColor(
        contractTransactionCountScore.score,
      )} ${contractTransactionCountScore.description}`,
      'Previous interactions': `${getColor(
        contractUserTransactionScore.score,
      )} ${contractUserTransactionScore.description}`,
      'Contract age': `${getColor(contractAgeScore.score)} ${
        contractAgeScore.description
      }`,
      'Contract verification': `${getColor(contractVerificationScore.score)} ${
        contractVerificationScore.description
      }`,
    },
  };
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