const app = require("../app");
const abiDecoder = require("abi-decoder");
const Web3 = require("web3");
const axios = require("axios");

class ETH {
    #key = "2KKTKZ8MSG6DNUPQ4K9JVWPQ4H33DSUQA3"
    constructor(){
        const apiUrl = app.ethNodeUrl
        const usdt_abi = app.abis.usdterc20_abi;
        const usdc_abi = app.abis.usdcerc20_abi;
        this.web3 = new Web3(new Web3.providers.HttpProvider(apiUrl));
        abiDecoder.addABI(usdt_abi);
        abiDecoder.addABI(usdc_abi);
        this.decoder = abiDecoder;
    }

    decodeInput(input){
        try{
            return this.decoder.decodeMethod(input);
        } catch (error) {
            console.error("Error decoding input data:", error);
            return null;
        }
    }

    async decodeTxInput(txHash) {
        try{
            const tx = await this.web3.eth.getTransaction(txHash);
            if (!tx || !tx.input) {
                console.error("Transaction not found or has no input data.");
                return null;
            }
            return this.decodeInput(tx.input);
        } catch (error) {
            console.error("Error decoding transaction input:", error);
            return null;
        }
    }

    decodeUSDT(input){
        const decoded = this.decodeInput(input)
        const result = []
        if (decoded && decoded.name === "transfer") {
            for (let item of decoded.params) {
                const obj = {}
                if (item.name === "_to") {
                    obj.toAddress = item.value;
                }
                if (item.name === "_value") {
                    obj.amount = this.web3.utils.fromWei(item.value, "ether");
                }
                if (Object.keys(obj).length > 0) {
                    result.push(obj);
                }
            }
        }
        return result;
    }

    decodeUSDC(input){
        const decoded = this.decodeInput(input)
        const result = []
        if (decoded && decoded.name === "transfer") {
            for (let item of decoded.params) {
                const obj = {}
                if (item.name === "to") {
                    obj.toAddress = item.value;
                }
                if (item.name === "value") {
                    obj.amount = this.web3.utils.fromWei(item.value, "mwei");
                }
                if (Object.keys(obj).length > 0) {
                    result.push(obj);
                }
            }
        }
        return result;
    }

    async checkUSDTPaymentStatus(address, amount, ts){
        const url = `${app.ethNodeUrl}
        ?chainid=1
        &module=account
        &action=tokentx
        &contractaddress=0xdAC17F958D2ee523a2206206994597C13D831ec7
        &address=${address}
        &page=1
        &offset=100
        &startblock=0
        &endblock=27025780
        &sort=asc
        &apikey=${this.#key}`
        try {
            const response = await axios.get(url);
            const transactions = response.data.result;

            if (!Array.isArray(transactions) || transactions.length === 0) {
                return { code: -1, result: false, data: [] };
            }

            // 筛选时间戳 >= ts 的交易
            const afterTimestampTxs = transactions.filter(tx => parseInt(tx.timeStamp) >= ts);

            if (afterTimestampTxs.length === 0) {
                return { code: -1, result: false, data: [] };
            }

            // 筛选出金额等于指定值的交易（USDT 最小单位是 6 位）
            const matchedTxs = afterTimestampTxs.filter(tx => parseFloat(tx.value) / 1_000_000 === amount && tx.functionName === "transfer(address _to, uint256 _value)");

            if (matchedTxs.length === 0) {
                return { code: -1, result: false, data: [] };
            }

            return {
                code: 0,
                result: true,
                data: matchedTxs.length === 1 ? matchedTxs[0] : matchedTxs,
            };
        } catch (error) {
            console.error("Error fetching transactions:", error);
            return {code:-1, result: false, data:[]};
        }
    }

    async checkUSDCPaymentStatus(address, amount, ts) {
        const url = `${app.ethNodeUrl}
        ?chainid=1
        &module=account
        &action=tokentx
        &contractaddress=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
        &address=${address}
        &page=1
        &offset=100
        &startblock=0
        &endblock=27025780
        &sort=asc
        &apikey=${this.#key}`
        try{
            const response = await axios.get(url);
            const transactions = response.data.result;

            if (!Array.isArray(transactions) || transactions.length === 0) {
                return { code: -1, result: false, data: [] };
            }

            // 筛选时间戳 >= ts 的交易
            const afterTimestampTxs = transactions.filter(tx => parseInt(tx.timeStamp) >= ts);

            if (afterTimestampTxs.length === 0) {
                return { code: -1, result: false, data: [] };
            }

            // 筛选出金额等于指定值的交易（USDT 最小单位是 6 位）
            const matchedTxs = afterTimestampTxs.filter(tx => parseFloat(tx.value) / 1_000_000 === amount && tx.functionName === "transfer(address _to, uint256 _value)");

            if (matchedTxs.length === 0) {
                return { code: -1, result: false, data: [] };
            }

            return {
                code: 0,
                result: true,
                data: matchedTxs.length === 1 ? matchedTxs[0] : matchedTxs,
            };
        } catch (error) {
            console.error("Error fetching transactions:", error);
            return {code:-1, result: false, data:[]};
        }
    }
}

module.exports = ETH