import java.util.regex.Pattern;
import javax.swing.JOptionPane;
import java.io.File;

public class pmValidData
{

	public static String removeAllHTMLTags (String str)
	{

		String strReturn = "";

		for (int i = 0; i < str.length(); i++)
		{

			char c = str.charAt(i);

			if (!(c == '<' || c == '>'))
			{
				strReturn += c;
			}

		}

		return strReturn;

	}

	public static String getFileExt (String strFile)
	{

		int lastDot = strFile.lastIndexOf('.');

		if (lastDot != -1)
		{
			return strFile.substring(lastDot + 1);
		}

		return "";

	}

	public static int getValidAge (String strAge, int youngest, int oldest)
	{

		try
		{

			int age = Integer.parseInt(strAge);
			//If youngest/oldest has been specified (not -1) then make sure it is in the range
			if (age < 0 || (youngest != -1 && age < youngest) || (oldest != -1 && age > oldest))
			{
				return -1;
			}

			return age;

		}
		catch (NumberFormatException ex)
		{
			return -1;
		}

	}

	public static boolean containsValidChars (String str, boolean allLetters, boolean allDigits, String strOthers)
	{

		String strValid = strOthers;

		if (allLetters)
		{
			strValid += "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
		}

		if (allDigits)
		{
			strValid += "0123456789";
		}

		for (int i = 0; i < str.length(); i++)
		{
			//Tests each char of str can be found in the collection of valid chars
			if (strValid.indexOf(str.charAt(i)) == -1)
			{
				return false;
			}

		}

		return true;

	}

	public static boolean isValidStandardPassword (String strPass)
	{
		return containsValidChars(strPass, true, true, "");
	}

	public static boolean isValidAge (String strAge, int youngest, int oldest)
	{
		return getValidAge(strAge, youngest, oldest) != -1;
	}

	public static boolean isValidEmail (String strEmail)
	{
		//All credits for this e-mail pattern goes to
		//http://gregs.tcias.co.uk/javascript/checking_for_a_valid_e-mail_address.cfm
		String strPattern = "^[-._&0-9a-zA-Z]+[@][-._&0-9a-zA-Z]+[.][._0-9a-zA-Z]+[a-zA-Z]$";
		return Pattern.matches(strPattern, strEmail);

	}

	public static boolean isValidName (String strName)
	{
		return ((strName.length() >= 2 && strName.length() <= 20) && containsValidChars(strName, true, false, " "));
	}

	public static byte[] getValidImageBytes (File file, long fileSizeLimit) throws dialogueException
	{

		try
		{

			if (!file.exists())
			{
				throw new dialogueException("Could not open the file because it does not exist\n" + file.getAbsolutePath(), "File does not exist", JOptionPane.WARNING_MESSAGE);
			}
			else if (file.isDirectory())
			{
				throw new dialogueException("The selected item is a directory. Only can upload files\n" + file.getAbsolutePath(), "Not a file", JOptionPane.WARNING_MESSAGE);
			}
			else if (!file.canRead())
			{
				throw new dialogueException("The file can not be read, check file permissions\n" + file.getAbsolutePath(), "Read access error", JOptionPane.WARNING_MESSAGE);
			}

		}
		catch (SecurityException ex)
		{
			throw new dialogueException("The O/S is blocking this application from accessing the file\n" + file.getAbsolutePath(), "Security policy exception", JOptionPane.WARNING_MESSAGE);
		}

		String strExt = getFileExt(file.getName());

		if (!(strExt.equalsIgnoreCase("jpg") || strExt.equalsIgnoreCase("jpeg") || strExt.equalsIgnoreCase("gif")))
		{
			throw new dialogueException("Can only upload image files\n" + file.getAbsolutePath(), "Invalid file format", JOptionPane.WARNING_MESSAGE);
		}

		byte[] imageData = null;

		try
		{
			imageData = dataManager.getFileByteArray(file);
		}
		catch (Exception ex)
		{
			throw new dialogueException(ex.getMessage());
		}

		if ((fileSizeLimit != -1) && (imageData.length >= fileSizeLimit))
		{
			throw new dialogueException("The file is too big, the upload limit is " + fileSizeLimit + " bytes\n" + file.getAbsolutePath(), "Too big", JOptionPane.WARNING_MESSAGE);
		}

		return imageData;

	}

}