/*
 * Copyright (c) 2015 EMC Corporation
 * All Rights Reserved
 */
package com.emc.storageos.imageservercontroller.impl;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.UUID;

import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

import com.emc.storageos.imageservercontroller.exceptions.ImageServerControllerException;

public class ImageServerUtils {

    public static InputStream getResourceAsStream(String pathToResource) {
        Resource resource = new ClassPathResource(pathToResource);
        try {
            return resource.getInputStream();
        } catch (IOException e) {
            throw ImageServerControllerException.exceptions.unableToOpenResourceAsStream(pathToResource, e);
        }
    }

    public static String getResourceAsString(String pathToResource) {
        InputStream in = getResourceAsStream(pathToResource);
        byte[] b;
        try {
            b = new byte[in.available()];
            in.read(b);
            in.close();
        } catch (IOException e) {
            throw ImageServerControllerException.exceptions.unableToReadResource(pathToResource, e);
        }
        return new String(b);
    }

    public static StringBuilder replaceAll(StringBuilder sb, String oldValue, String newValue) {
        int start = sb.indexOf(oldValue);
        while (start != -1) {
            sb.replace(start, start + oldValue.length(), newValue);
            start = sb.indexOf(oldValue, start + newValue.length());
        }
        return sb;
    }

    /**
     * Expect strings in following 2 formats:
     * 422f1dfd-ce07-2820-494e-bf3b9d5e74d8
     * 422f1dfdce072820494ebf3b9d5e74d8
     * 
     * @param str
     * @return
     */
    public static UUID uuidFromString(String str) {
        if (str == null) {
            return null;
        }
        if (str.length() == 32) {
            // looks like dashes are missing, insert dashes
            StringBuilder sb = new StringBuilder(str);
            sb.insert(8, '-');
            sb.insert(13, '-');
            sb.insert(18, '-');
            sb.insert(23, '-');
            return UUID.fromString(sb.toString());
        } else {
            return UUID.fromString(str);
        }
    }

    /**
     * Expect strings in following 2 formats:
     * 422f1dfd-ce07-2820-494e-bf3b9d5e74d8
     * 422f1dfdce072820494ebf3b9d5e74d8
     * 
     * @param str
     * @return
     */
    public static boolean isUuid(String str) {
        try {
            uuidFromString(str);
        } catch (IllegalArgumentException e) {
            return false;
        }
        return true;
    }

    /**
     * Expects key/value pairs delimited by new line like this:
     * abc=123
     * xyz=505
     * 
     * @param str
     * @return
     */
    public static Properties stringToProperties(String str) {
        Properties result = new Properties();
        String[] arr = str.split("\n");
        for (String pair : arr) {
            String[] pairArr = pair.trim().split("=");
            if (pairArr.length == 2 && !pairArr[0].trim().startsWith("#")) {
                result.put(pairArr[0].trim(), pairArr[1].trim());
            }
        }
        return result;
    }
}