using System;
using System.Collections.Generic;
using System.IO;
using System.Xml;
using M17N;
using M17N.Core;
using M17N.Input;
using Xex = System.Xml.Xexpression;

public class Test
{
  private static void print (char key, MText head, MText preedit, MText tail)
  {
    Console.Write ("{0} -> \"{1}|{2}|{3}\" (", key, head, preedit, tail);
    for (int j = 0; j < head.Length; j++)
      Console.Write ("{0}U+{1:X4}", j == 0 ? "(" : " ", head[j]);
    Console.Write ("|");
    if (preedit != null)
      for (int j = 0; j < preedit.Length; j++)
	Console.Write ("{0}U+{1:X4}", j == 0 ? "" : " ", preedit[j]);
    Console.Write ("|");
    for (int j = 0; j < tail.Length; j++)
      Console.Write ("{0}U+{1:X4}", j == 0 ? "" : " ", tail[j]);
    Console.WriteLine (")");
  }

  public static void Main(string[] args)
  {
    // M17n.debug = true;
    int argc = 0;
    string appdir = "/usr/local/share/m17n";
    int trace_depth = 0;

    while (argc < args.Length && args[argc][0] == '-')
      {
	if (args[argc] == "-trace")
	  trace_depth = 10;
	else if (args[argc] == "-xml")
	  appdir = "/usr/local/share/m17n-xml";
	argc++;
      }
    if (argc + 2 >= args.Length)
      {
	Console.WriteLine ("Usage: mono [--debug] input.exe"
			   + " [-trace] [-xml] LANG NAME KEY-SEQUECE");
	return;
      }

    Xex.TraceDepth = trace_depth;
    MDatabase.ApplicationDir = appdir;
    MInputMethod im = MInputMethod.Find (args[argc], args[argc + 1]);
    MText mt = new MText ();
    MInputMethod.Session session = new MInputMethod.Session (im, mt, 0);

    MText str = args[argc + 2];
    MInputMethod.Key left = new MInputMethod.Key ("left");
    MInputMethod.Key right = new MInputMethod.Key ("right");

    for (int i = 0; i < str.Length; i++)
      {
	MInputMethod.Key key
	  = (str[i] == '<' ? left
	     : str[i] == '>' ? right
	     : new MInputMethod.Key (str[i]));
	bool result = session.HandleKey (ref key);
	int pos = session.CurrentPos;
	if (! result)
	  {
	    if (key == left)
	      {
		if (pos > 0)
		  session.CurrentPos = --pos;
	      }
	    else if (key == right)
	      {
		if (pos < mt.Length)
		  session.CurrentPos = ++pos;
	      }
	    else
	      {
		mt.Ins (pos, str[i]);
		session.CurrentPos = ++pos;
	      }
	  }
	print ((char) str[i], mt[0, pos], session.Preedit, mt[pos, mt.Length]);
      }
    if (! session.Close ())
      {
	int pos = session.CurrentPos;
	print (' ', mt[0, pos], null, mt[pos, mt.Length]);
      }
  }
}