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package org.fisco.bcos.sdk.v3.codec;

import java.util.List;
import java.util.stream.Collectors;
import org.fisco.bcos.sdk.v3.codec.datatypes.Event;
import org.fisco.bcos.sdk.v3.codec.datatypes.Type;
import org.fisco.bcos.sdk.v3.codec.datatypes.TypeReference;
import org.fisco.bcos.sdk.v3.crypto.CryptoSuite;
import org.fisco.bcos.sdk.v3.crypto.hash.Hash;
import org.fisco.bcos.sdk.v3.utils.Numeric;

/**
 * Ethereum filter encoding. Further limited details are available here.
 */
public class EventEncoder {
    @Deprecated private CryptoSuite cryptoSuite;
    private final Hash hashImpl;

    @Deprecated
    public EventEncoder(CryptoSuite cryptoSuite) {
        this.cryptoSuite = cryptoSuite;
        this.hashImpl = cryptoSuite.getHashImpl();
    }

    public EventEncoder(Hash hashImpl) {
        this.hashImpl = hashImpl;
    }

    public String encode(Event event) {
        String methodSignature = buildMethodSignature(event.getName(), event.getParameters());

        return buildEventSignature(methodSignature);
    }

    public  String buildMethodSignature(
            String methodName, List> parameters) {
        StringBuilder result = new StringBuilder();
        result.append(methodName);
        result.append("(");
        String params =
                parameters.stream().map(Utils::getMethodSign).collect(Collectors.joining(","));
        result.append(params);
        result.append(")");
        return result.toString();
    }

    public String buildEventSignature(String methodSignature) {
        byte[] input = methodSignature.getBytes();
        byte[] hash = this.hashImpl.hash(input);
        return Numeric.toHexString(hash);
    }
}