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package com.github.jackpanz.spring.initialization;

import org.apache.commons.lang3.BooleanUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;

public class ConstantsInstantiation {

    private static final Logger logger = LoggerFactory.getLogger(ConstantsInstantiation.class);

    public static void readConstant(Class clazz,String propertiePath) {

        List numbers = Arrays.asList(new Class[]{
                byte.class, short.class, int.class, long.class, float.class, double.class
        });

        try (InputStreamReader inputStream = new InputStreamReader(ConstantsInstantiation.class.getResourceAsStream(propertiePath), "UTF-8")) {
            Properties properties = new Properties();
            properties.load(inputStream);
            properties.keys();

            Object constantsConfigurer = clazz.newInstance();
            Field[] fields = clazz.getDeclaredFields();
            for (int i = 0; i < fields.length; i++) {
                String name = fields[i].getName();
                try {
                    String value = (String) properties.get(name);
                    if (value != null) {
                        if (fields[i].getType() == String.class) {
                            fields[i].set(constantsConfigurer, value);
                        } else if (fields[i].getType() == boolean.class) {
                            fields[i].set(constantsConfigurer, BooleanUtils.toBoolean(value));
                        } else if (numbers.contains(fields[i].getType())) {
                            String methodName = "to" + fields[i].getType().getName().substring(0, 1).toUpperCase() + fields[i].getType().getName().substring(1);
                            Class threadClazz = Class.forName("org.apache.commons.lang3.math.NumberUtils");
                            Method method = threadClazz.getMethod(methodName, String.class);
                            Object object = method.invoke(null, value);
                            fields[i].set(constantsConfigurer, object);
                        }
                        logger.info(clazz.getCanonicalName() + " " + name + " = " + fields[i].get(constantsConfigurer));
                    }
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}