package xyz.thastertyn.Jecna;

import java.io.File;
import java.io.IOException;
import java.net.UnknownHostException;

import org.jsoup.Connection;
import org.jsoup.Jsoup;
import org.jsoup.Connection.Method;

public class Login {

	private String Jsessionid = null;

	// Check for session expiration
	private long start;
	private long lastCheck;

	/**
	 * Zkontroluje zda jiz neexistuji ulozene udaje na systemu
	 * @return <ul>
	 * <li> {@code true} soubor existuje a neni prazdny </li>
	 * <li> {@code false} neexistuje, nebo jsou prazdne </li>
	 * </ul>
	 */
	public boolean getCredentials()
	{
		File credentials = null;

		if(System.getProperty("os.name").equals("Linux"))
		{
			credentials = new File("~/.local/share/jecnak/credentials.json");

		}else if(System.getProperty("os.name").contains("Windows"))
		{
			credentials = new File(System.getenv("APPDATA\\jecnak\\"));
		}

		if(!credentials.exists() || credentials.length() == 0) 
		{
			return false;
		}
		return true;
	}

	public void saveCredentials(String user, String pass)
	{
		File credentials = null;

		if(System.getProperty("os.name").equals("Linux"))
		{
			credentials = new File("~/.local/share/jecnak/credentials.json");

		}else if(System.getProperty("os.name").contains("Windows"))
		{
			credentials = new File(System.getenv("APPDATA\\jecnak\\"));
		}

		if(!credentials.exists())
		{

		}
	}

	public String getJSESSIONID()
	{
		return Jsessionid;
	}

	public byte login(String user, String pass)
	{
		try {
			//#region JSESSIONID
			Connection.Response response = Jsoup.connect("https://www.spsejecna.cz")
			.header("Connection", "keep-alive")
			.method(Method.HEAD)
			.execute();

			Jsessionid = response.cookie("JSESSIONID");
			//#endregion

			//#region Token3
			String token3 = Jsoup.connect("https://www.spsejecna.cz/user/role?role=student")
			.header("Connection", "keep-alive")
			.cookie("JSESSIONID", Jsessionid)
			.get()
			.select("input[name=token3]")
			.attr("value");
			//#endregion

			//#region Login
			Connection.Response login = Jsoup.connect("https://www.spsejecna.cz/user/login")
			.method(Connection.Method.POST)
			.header("Content-Type", "application/x-www-form-urlencoded")
			//.header("Content-Length", "71") Adds 10 seconds to total request time
			.header("Origin", "https://www.spsejecna.cz")
			.header("Connection", "keep-alive")
			.cookie("JSESSIONID", Jsessionid)
			.cookie("role", "student")
			.data("token3", token3)
			.data("user", user)
			.data("pass", pass)
			.data("submit", "P%C5%99ihl%C3%A1sit+se")
			.followRedirects(true)
			.execute();
			//#endregion

			start = System.currentTimeMillis() / 1000L;
			lastCheck = start;

			return 0;
		} catch(UnknownHostException e)
		{
			// Not connected to internet
			return 127;
		} catch(IOException e)
		{
			return 126;
		}
	}
}