// Nik Johnson
// 2-24-2024
// TA: Andy Ruan

import java.util.*;
import java.io.*;

// file-based linting object, linting based on checks defined in a list
public class Linter {

    private List<Check> checks;

    // constructor, takes list of checks to perform
    public Linter(List<Check> checks) {
        this.checks = checks;
    }

    // compile list of errors based on output of check classes
    // takes filename to perform checks on
    // return list of errors present in that file
    public List<Error> lint(String fileName) throws FileNotFoundException {
        File toBeChecked = new File(fileName);
        Scanner fileScanner = new Scanner(toBeChecked);
        List<Error> errors = new ArrayList<>();
        int lineNumber = 1;
        while (fileScanner.hasNext()) {
            String line = fileScanner.nextLine();
            for (Check check : checks) {
                Optional<Error> error = check.lint(line, lineNumber);
                if (error.isPresent()) {
                    errors.add(error.get());
                }
            }
            lineNumber++;
        }
        fileScanner.close();
        return errors;
    }
}