import java.util.Vector;

import Mail.*;
public class NUSA
{
	public static void main(String []args){
		//System.out.println( deceived_DHT("aA") );
		if(login("a5","a2"))
			System.out.println("成功");
		else
			System.out.println("失敗");
		System.out.println("程式結束");
	}

	public static int deceived_DHT (String input){
		//把input.第二個字元的ASCII碼mod3 當作結果
		int output = input.charAt(1);
		System.out.println("*** in deceived_DHT ***");
		System.out.println("deceived_DHT(" + input + ")=" + output + ", mod 3 = " + output%3);
		output = output % 3;
		return output;
	}
	public static boolean register(String Wanted_Account , String Wanted_Passwd){
		/*檢查帳號有無重覆 ->把帳號拿去做DHT，得到一個account_server，
		 * 看該account_server有沒有Wanted_Account_dir.xml這個檔案
		 * 若已存在，傳回false
		 * 若不存在，建立xml檔。方式：寄信到account_server ,主旨：Wanted_Account_dir.xml
		 */
		System.out.println("*** in register ***");
		int account_server = deceived_DHT(Wanted_Account);
		if(account_server == 0){
			/*為dropbox
			 *檢查 nctunusa2011@gmail.com的dropbox空間，有沒有Wanted_Account_dir.xml這個檔案
			 */
		}
		else if(account_server == 1){
			/*為gmail
			 *收信，看信件標題有沒有Wanted_Account_dir.xml這個檔案
			 */
			int FoundMessage = -1;

			System.out.println("檢查有無主旨為\"" + Wanted_Account +"_dir.xml" +"\"的信件");
			FoundMessage = MailHandler.findSubject(
					MailHandler.Gmail_Imap_Server,
					MailHandler.Gmail_User_Account,
					MailHandler.Gmail_Password,
					Wanted_Account +"_dir.xml"
					);

			if(FoundMessage > -1){	//這個Wanted_Account有人用過了！
				System.out.println("有找到");
				return false;
			}
			System.out.println("沒找到。發送信件...");
			//建立空的dir.xml (寄一邽標題為Wanted_Account_dir.xml的信)
			String subject = Wanted_Account +"_dir.xml";
			String content = "";
			MailHandler.sendMail("nctunusa2011@gmail.com", subject, content);
		}
		else if(account_server == 2){
			/*為Hotmail
			*收信，看信件標題有沒有Wanted_Account_dir.xml這個檔案
			*/
			int FoundMessage = -1;
			System.out.println("檢查有無主旨為\"" + Wanted_Account +"_dir.xml" +"\"的信件");
			FoundMessage = MailHandler.findSubject(
					MailHandler.Hotmail_Pop3_Server,
					MailHandler.Hotmail_User_Account,
					MailHandler.Hotmail_Password,
					Wanted_Account +"_dir.xml"
					);

			if(FoundMessage > -1){	//這個Wanted_Account有人用過了！
				System.out.println("有找到");
				return false;
			}
			System.out.println("沒找到。發送信件...");
			//建立空的dir.xml (寄一邽標題為Wanted_Account_dir.xml的信)
			String subject = Wanted_Account +"_dir.xml";
			String content = "";
			MailHandler.sendMail("nctunusa2011@hotmail.com", subject, content);
		}
		else{
			System.out.println("***** in register *****");
			System.out.println("出現例外");
		}
		System.out.println("註冊成功");
		return true;
	}

	public static String [][] connect_seed_server (){
		/*傳回一個二維陣列，記錄現在有的account_server
		 * 直接用String [][]感覺有點弱弱的哈哈，有空再改吧！
		 */
		String [][]account_server_table={
				{"nctunusa2011@gmail.com","nctunusa"},	//dropbox
				{"nctunusa2011@gmail.com","nctunusa"},	//gmail
				{"nctunusa2011@hotmail.com","nctunusa"}	//hotmail
		};

		return account_server_table;
	}
	public static boolean login(String Account, String passwd){
		//把seed server的內容抓進來account_server_table
		String [][]account_table = connect_seed_server();

		//把Account拿去做DHT，算出該Account的dir.xml放在哪一個account_server
		//account_server_number= 0或1或2，目前只能處理1(gmail)或2(hotmail)
		int account_number = deceived_DHT(Account);

		String server = "";
		if(account_number == 1)
			server = "imap.gmail.com";	//getContentOfSubject需要適當的server，所以需要此if-else。
		else if(account_number == 2)
			server = "pop3.live.com";
		else	//account_server_number ==0
			server = "error";

		String dir_xml = MailHandler.getContentOfSubject(server,account_table[account_number][0],account_table[account_number][1],Account+"_dir.xml");

		if(dir_xml.equals("-1") ){
			System.out.println("帳號或密碼錯誤！");
			System.out.println("在account_server中找不到"+Account+"_dir.xml"+"的主旨");
			System.out.println("登入失敗");
			return false;
		}

		System.out.println("登入成功");
		System.out.println("使用者的目錄檔案內容如下：");
		System.out.println("***********************");
		System.out.println(dir_xml);
		System.out.println("***********************");
		return true;

	}
}