package com.company;

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

public class FileCriteria {

    interface Criteria {
        boolean isValid(File file, String value, String op);
    }
    class SizeCheck implements Criteria{
        public boolean isValid(File file, String value, String op){
            switch(op){
                case ">":
                    return file.length() > Integer.valueOf(value) * 1024 * 1024;
                case "<":
                    return file.length() < Integer.valueOf(value) * 1024 * 1024;
                case "=":
                    return file.length() < Integer.valueOf(value) * 1024 * 1024;
            }
            return true;
        }
    }
    class ExtensionCheck implements Criteria{
        public boolean isValid(File file, String value, String op){
            return file.getName().endsWith(value);
        }
    }
    class Factory{
        private Map<String, Criteria> criteria = new HashMap<>();
        public Factory(){
            criteria.put("size", new SizeCheck());
            criteria.put("extension", new ExtensionCheck());
        }
        public Criteria create(String s){
            return criteria.get(s);
        }
    }
    public void listFiles(String path, List<OperationClass> ops){
        Factory factory = new Factory();
        File folder = new File(path);
        File[] files = folder.listFiles();
        for(File file : files){
            if(file.isFile()){
                boolean isValid = true;
                for(OperationClass op : ops){
                    if(!factory.create(op.criteria).isValid(file, op.value, op.op)){
                        isValid = false;
                    }
                }
                if(isValid) System.out.println(file.getName());
            } else if(file.isDirectory()){
                listFiles(file.getAbsolutePath(), ops);
            }
        }
    }

    public class OperationClass {
        String criteria;
        String value;
        String op;
    }
}