package de.mrbesen.telegram;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import de.mrbesen.telegram.objects.TReplyMarkup;

public class MessageBuilder {

	private String text;
	private Formatting format = Formatting.None;
	private boolean silent = false;
	private boolean no_web_view = false;
	private int reciver_id = 0;
	private int reply_to_message_id = 0;
	private TReplyMarkup markup = null;
	
	public MessageBuilder setReciver(int id) {
		reciver_id = id;
		return this;
	}
	
	public MessageBuilder setText(String txt) {
		txt = txt.trim();
		if(txt.isEmpty()) {
			throw new IllegalArgumentException("text is not allowed to be empty");
		}
		try {
			text =  URLEncoder.encode(txt, "UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return this;
	}
	
	public MessageBuilder setFormatting(Formatting form) {
		format = form;
		return this;
	}
	
	public MessageBuilder setSilent(boolean b) {
		silent = b;
		return this;
	}

	public MessageBuilder setNoWebView(boolean b) {
		no_web_view = b;
		return this;
	}

	public MessageBuilder setMarkup(TReplyMarkup markup) {
		this.markup = markup;
		return this;
	}

	public SendableMessage build() {
		if(reciver_id == 0) {
			throw new MissingException("Reciver");
		}
		if(text != null) {
			if(text.trim().isEmpty()) {
				throw new MissingException("Text");
			}
		} else {
			throw new MissingException("Text");
		}
		String optionals = "";
		if(format != Formatting.None) {
			optionals += "&parse_mode=" + format.getname().toLowerCase();
		}
		if(reply_to_message_id != 0) {
			optionals += "&reply_to_message_id=" + reply_to_message_id;
		}
		if(markup != null) {
			optionals += "&reply_markup=" + markup.toJSONString();
		}
		
		return new SendableMessage("chat_id=" + reciver_id + "&text=" + text.trim() + optionals + "&disable_web_page_preview=" + no_web_view + "&disable_notification=" + silent);
	}
	
	class SendableMessage {
		private String q;
		
		public SendableMessage(String q) {
			this.q = q;
		}
		String getQ() {
			return q;
		}
	}
	
	public enum Formatting {
		None(""),
		HTML("HTML"),
		MD("Markdown");
		
		private String apiname;
		
		private Formatting(String s) {
			apiname = s;
		}
		
		public String getname() {
			return apiname;
		}
	}
	
	public class MissingException extends RuntimeException {

		private static final long serialVersionUID = 2750912631502103642L;

		public MissingException(String missing_obj) {
			super("The Object " + missing_obj + " is missing or invalid.");
		}
	}
}