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package net.israfil.service.mail.api.smtp;

import java.util.Collection;

import net.israfil.service.mail.api.MailHeader;


public abstract class SMTPUtils {
	
	/**
	 * Takes a string and asserts that all characters are ASCII.
	 */
	public static String assertASCII(final String string) {
		int length;
		if (string == null || (length = string.length()) == 0) return string;
		char[] chars = new char[length];
		string.getChars(0, length-1, chars,0);
		for (int i = 0; i < length; i++) {
			if (chars[i] > 127)
				throw new IllegalArgumentException("String contains non-ASCII characters: " + string);
		}
		return string;
	}

	public static String getLocal(String address) {
		if (address == null) throw new IllegalArgumentException("SMTP must be constructed with at least a local address.");
		if (!address.contains("@")) return address;
		else {
			String local = address.split("@")[0];
			return (local == null || local.equals("")) ? null : local;
		}
	}

	public static String getDomain(String address) {
		if (address == null) throw new IllegalArgumentException("SMTP must be constructed with at least a local address.");
		if (!address.contains("@")) return null;
		else {
			String[] parts = address.split("@");
			return (parts.length > 1) ? parts[1] : null;
		}
	}

	
	@SuppressWarnings("unchecked")
	public static void validateSpecialHeader(SMTPHeaderTypes type,MailHeader header) {
		if (type == null) return;
		if (header == null) throw new IllegalArgumentException("Error attempting to set a null value as a header object.");
		switch(type) {
			case Bcc:
			case To:
			case Cc:
				try {
					Collection contents = (Collection)header.getContent();
					for (@SuppressWarnings("unused") SMTPAddress address : contents);
				} catch (ClassCastException cce) {
					throw new IllegalArgumentException("Header " + type + " does not contain a valid collection of SMTPAddress instances");
				}
				break;
			case Subject:
				try {
					@SuppressWarnings("unused")
					String contents = (String)header.getContent();
				} catch (ClassCastException cce) {
					throw new IllegalArgumentException("Header " + type + " does not contain a valid collection of SMTPAddress instances");
				}
				break;
			case From:
				try {
					@SuppressWarnings("unused")
					SMTPAddress contents = (SMTPAddress)header.getContent();
				} catch (ClassCastException cce) {
					throw new IllegalArgumentException("Header " + type + " does not contain a valid collection of SMTPAddress instances");
				}
				break;
		}
	}

}