import java.io.IOException;

import java.nio.file.*;

import java.nio.file.attribute.BasicFileAttributes;

/**

* Validates that the input file exists and is readable.

*

* Usage: java step_1_validate_input.java [input_file]

*/

void main(String[] args) throws IOException {

var inputPath = args.length > 0 ? Path.of(args[0]) : Path.of(Constants.CONTRIBUTE_README_FILE);

System.out.println("Step 1: Validating input file...");

System.out.printf("Input file: %s%n", inputPath.toAbsolutePath());

if (!Files.exists(inputPath) || !Files.isReadable(inputPath)) {

System.err.printf("ERROR: File '%s' does not exist or is not readable.%n", inputPath);

System.exit(1);

}

System.out.println("SUCCESS: Input file validation passed!");

var attrs = Files.readAttributes(inputPath, BasicFileAttributes.class);

System.out.printf(

"File size: %d bytes, Last modified: %s%n",

attrs.size(),

attrs.lastModifiedTime()

);

}