/*
 * Copyright 2025 Google. This software is provided as-is, without warranty or representation for any use or purpose.
 * Your use of it is subject to your agreement with Google.
 */
package com.example.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.function.Supplier;

/**
 * A utility class to measure and log the execution time of a given operation.
 * It uses the Supplier functional interface to wrap the code block to be timed.
 */
public class PerformanceTimer {
    private static final Logger logger = LoggerFactory.getLogger(PerformanceTimer.class);


    public static <T> T timeExecution(String operationName, Supplier<T> operation) {
        long startTime = System.nanoTime();
        try {
            T result = operation.get();
            long endTime = System.nanoTime();
            long durationNanos = endTime - startTime;
            double durationMillis = durationNanos / 1_000_000.0;
            logger.info("Operation '{}' completed in {} ms.", operationName, String.format("%.2f", durationMillis));
            return result;
        } catch (Exception e) {
            long endTime = System.nanoTime();
            long durationNanos = endTime - startTime;
            double durationMillis = durationNanos / 1_000_000.0;
            logger.error("Operation '{}' failed in {} ms: {}", operationName, String.format("%.2f", durationMillis), e.getMessage(), e);
            throw new RuntimeException("Error during timed operation: " + operationName, e);
        }
    }
}