/*
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
    blaconvert - Java program for converting units of measurement and currency using Google APIs
    by blatech
    
    Copyright 2011 Joe Robinson <joe@lc8n.com>
    based on code by Jamie Walters <jagw@jagw.co.uk>
    based on code by  Joe Robinson <joe@lc8n.com>
    
    Version 1.4
    
    CHANGELOG
    1.0 - First version
    1.1 - Allow units with more than one word eg "light year"
        - Added "same unit" error
        - Ensure standard imperial measurements are used for some units - google defaults to US
    1.2 - Replace crazy non unicode spaces with commas
    1.21 - Added quart to imperial measurements
    1.3 - Added support for currency symbols
    1.31 - Trying to add euro (probably won't work)
    1.32 - Changed currency to unicode
    1.33 - More euro fixing (maybe)
    1.34 - Fixed output of negative numbers
    1.4 - Added bitcoin conversion
    TODO
    - Raw output option - result only with no spaces/commas/units
*/


import java.net.URL;
import java.net.URLConnection;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class blaconvert {

	public static void main(String[] args) throws IOException
	{
        String sourceUnit = "";
        String targetUnit = "";
        String amount = "";
	String version = "1.4";
	
		/* Build query from query or arguments, depending on whether
		   arguments were given. */
		if (args.length == 0) {
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			String[] split = br.readLine().split(" ");
			int start = 0;
			int to = 0;
			int output = 0;
			if (split[0].startsWith("-"))
			{
				if (split[0].equals("-v") || split[0].equals("--version"))
				{
					System.out.println("v"+version);
					System.exit(0);
				} else if (split[0].charAt(1) == 'r')
				{
					//reserved for raw output option
					output = 1;
					start = 1;
				}
			}
			
			for(int i = 0; i < split.length; i++)
			{
				if (split[i].toLowerCase().equals("to") || split[i].toLowerCase().equals("in"))
				{
					to = i;
				}
			}
			amount = split[start];
			
			for (int i = start+1; i < to-1; i++)
			{
				sourceUnit += split[i]+"%20";
			}
            sourceUnit += split[to-1];
			for (int i = to+1; i < split.length-1; i++)
			{
				targetUnit += split[i]+"%20";
			}
            targetUnit += split[split.length-1];
			} catch (Exception e) {
				System.err.println("Error:" + e.getMessage());
				System.exit(1);
			}
		} else {
			
			if (args[0].equals("-v") || args[0].equals("--version"))
			{
				System.out.println("v"+version);
				System.exit(0);
			}
			amount = args[0];
			sourceUnit = args[1];
			targetUnit = args[2];
		}
		
		String[] imperial = {"pint", "gallon", "gal", "cup", "teaspoon", "tablespoon", "fl oz", "fluid ounce", "quart"};
		
		for(int i = 0; i < imperial.length; i++)
		{
			if (sourceUnit.startsWith(imperial[i]))
			{
				sourceUnit = "Imperial%20"+sourceUnit;
			}
			
			if (targetUnit.startsWith(imperial[i]))
			{
				targetUnit = "Imperial%20"+targetUnit;
			}
		}
        boolean currency = false;
		if(amount.contains("\u00A3") || amount.contains("\u0024") || amount.contains("\u20AC") || 
            amount.contains("\u00A5") || amount.contains("\u0080"))
        {
            amount.replaceAll("\u00A3","%A3");
            amount.replaceAll("\u0024","%24");
            amount.replaceAll("\u20AC","%80");
            amount.replaceAll("\u0080","%80");
            amount.replaceAll("\u00A5","%A5");
            
            currency = true;
        }

        //Bitcoin conversion
        if (sourceUnit.trim().toUpperCase().equals("BTC"))  {
            URL url = new URL("https://blockchain.info/tobtc?currency="+targetUnit.toUpperCase()+"&value=1");
            try {
    		    URLConnection urlc = url.openConnection();
	    	    BufferedReader br = new BufferedReader(new InputStreamReader(urlc.getInputStream()));
                String response = br.readLine();
                double result = Double.parseDouble(response);
                double value = Double.parseDouble(amount);
                result = ((1/result)*value);
                System.out.println(amount+" Bitcoins = "+result+" "+targetUnit);
                System.exit(0);
            } catch (Exception e) {
                if(e.toString().contains("500")) {
                    System.out.println("500 Error: Probably unknown currency");
                } else if (e.toString().contains("404")) {
                    System.out.println("404 Error: Bitcoin converter unavailable");
                }
                System.exit(1);
            }

        } else if (targetUnit.trim().toUpperCase().equals("BTC")) {
            URL url = new URL("https://blockchain.info/tobtc?currency="+sourceUnit.toUpperCase()+"&value="+amount);
    		URLConnection urlc = url.openConnection();
            try {
	    	    BufferedReader br = new BufferedReader(new InputStreamReader(urlc.getInputStream()));
                String response = br.readLine();
                System.out.println(amount+" "+sourceUnit+" = "+response+" Bitcoins");
                System.exit(0);
            } catch (Exception e) {
                if(e.toString().contains("500")) {
                    System.out.println("500 Error: Probably unknown currency");
                } else if (e.toString().contains("404")) {
                    System.out.println("404 Error: Bitcoin converter unavailable");
                }
                System.exit(1);
            }

        }

		//URL which provides XML response
		URL url = new URL("http://www.google.com/ig/calculator?hl=en&q="+amount+sourceUnit+"=?"+targetUnit);
		//System.out.println("http://www.google.com/ig/calculator?hl=en&q="+amount+sourceUnit+"=?"+targetUnit);
		URLConnection urlc = url.openConnection();

		BufferedReader br = new BufferedReader(new InputStreamReader(urlc.getInputStream()));
		String line;
		String[] lines;
		String tempString = "";
		String lhs = "";
		String rhs = "";
		String error = "";
		//Read every line
		while ((line = br.readLine()) != null)
		{
			// Splits the google output by the commas
			lines = line.split(",");
			
			for(int i=0; i<lines.length; i++){
				//System.out.println(lines[i]);
				// Get the useful information (the urls!)
				if(lines[i].trim().startsWith("{lhs")){
					tempString = lines[i];
					// Blat the non-url information
					lhs = tempString.substring(7, tempString.length()-1);
				}
               			else if(lines[i].trim().startsWith("rhs")){
					tempString = lines[i];
					// Blat the non-url information
					rhs = tempString.substring(6, tempString.length()-1);
				}
				else if(lines[i].trim().startsWith("error")){
					tempString = lines[i];
					// Blat the non-url information
					error = tempString.substring(8, tempString.length()-1);
				}

			}

		}
		
		String[] parts = rhs.split(" ");
		String result = fixCrazySpaces(parts[0]) + " ";
		//Convert weird output into something that makes sense
		for (int i = 1; i < parts.length; i++)
		{
			//System.out.println(parts[i]);
			if (parts[i].equals("\\x26#215;"))
			{
				parts[i] = "*";
			} else if (parts[i].startsWith("10\\"))
			{
				String[] exp = parts[i].split("\\\\");
				parts[i] = "10^"+exp[2].substring(3, exp[2].length());
			}
			
			result += parts[i] + " ";
		}
		
		parts = lhs.split(" ");
		lhs = "";
        if(!currency) {
            parts[0] = fixCrazySpaces(parts[0]);
        } else {
            parts[1] = fixCrazySpaces(parts[1]);
        }
		for (int i = 0; i < parts.length; i ++)
		{
			lhs += parts[i]+" ";
		}
		


		// Print results
		if(error.isEmpty()) {	
			System.out.println(lhs+"= "+result);

			System.exit(0);
			
		} else {
			if(error.equals("4"))
			{
				error = "Unknown unit";
			} else if (error.equals("0"))
			{
				error = "Both units are the same";
			}
			System.out.print("Error: "+error);
			System.out.println("\n");
			System.exit(1);
		}

	}
	
	private static String fixCrazySpaces(String string)
	{
		char[] chars = string.toCharArray();
		String fixed = "";
		for (int i = 0; i < chars.length; i++)
		{
			if (Character.getNumericValue(chars[i]) < 0 && chars[i] != '.' && chars[i] != '-')
			{
				fixed += ",";
			} else {
				fixed += chars[i];
			}
		}
		
		return fixed;
	}
	

}