// Copyright (c) 2008 ichi (http://ichi.fool.jp/memo/)

// 

// Permission is hereby granted, free of charge, to any person obtaining

// a copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to

// permit persons to whom the Software is furnished to do so, subject to

// the following conditions:

// 

// The above copyright notice and this permission notice shall be

// included in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

(function($){

	

	$.fn.autoKana = function(target, config){

		config = $.extend({

			katakana: true

		}, config);

		

		var $this = this,

		    $target = $(target),

		    timer;

		

		var kana_extraction_pattern = new RegExp('[^ 　ぁあ-んー]', 'g'),

		    kana_compacting_pattern = new RegExp('[ぁぃぅぇぉっゃゅょ]', 'g');

		

		var baseKana     = '',

		    flagConvert  = false,

		    ignoreString = '',

		    input        = '',

		    values       = [];

		

		

		var _stateClear = function(){

			baseKana     = '';

			flagConvert  = false;

			ignoreString = '';

			input        = '';

			values       = [];

		};

		var _stateInput = function() {

			baseKana     = $target.val();

			flagConvert  = false;

			ignoreString = $this.val();

		};

		var _stateConvert = function() {

			baseKana     = baseKana + values.join('');

			flagConvert  = true;

			values       = [];

		};

		

		var _setInterval = function() {

			timer = setInterval(_checkValue, 30);

		};

		var _clearInterval = function() {

			clearInterval(timer);

		};

		

		var _checkConvert = function(new_values) {

			if(!flagConvert) {

				if(Math.abs(values.length - new_values.length) > 1) {

					var tmp_values = new_values.join('').replace(kana_compacting_pattern, '').split('');

					if(Math.abs(values.length - tmp_values.length) > 1) {

						_stateConvert();

					}

				} else {

					if(values.length == input.length && values.join('') != input) {

						_stateConvert();

					}

				}

			}

		};

		var _checkValue = function() {

			var new_input = $this.val(),

			    new_values;

			

			if(new_input == '') {

				_stateClear();

				_setKana();

			}else{

				new_input = _removeString(new_input);

				if(input == new_input) {

					return;

				}else{

					input = new_input;

					if(!flagConvert) {

						new_values = new_input.replace(kana_extraction_pattern, '').split('');

						_checkConvert(new_values);

						_setKana(new_values);

					}

				}

			}

		};

		

		var _setKana = function(new_values) {

			if(!flagConvert) {

				if(new_values) {

					values = new_values;

				}

				$target.val(_toKatakana(baseKana + values.join('')));

			}

		};

		

		var _removeString = function(new_input) {

			if(new_input.match(ignoreString)) {

				return new_input.replace(ignoreString, '');

			}else{

				var ignoreArray = ignoreString.split(''),

				    inputArray = new_input.split('');

				for(var i = 0, iL = ignoreArray.length; i <iL; i++){

					if(ignoreArray[i] == inputArray[i]) {

						inputArray[i] = '';

					}

				}

				return inputArray.join('');

			}

		};

		

		var _isHiragana = function(c) {

			return ((c >= 12353 && c <= 12435) || c == 12445 || c == 12446);

		};

		

		var _toKatakana = function(src) {

			if(config.katakana){

				var c,

				    str = new String;

				for(var i = 0, iL = src.length; i < iL; i++) {

					c = src.charCodeAt(i);

					if(_isHiragana(c)) {

						str += String.fromCharCode(c + 96);

					}else{

						str += src.charAt(i);

					}

				}

				return str;

			}else{

				return src;

			}

		};

		

		

		return $this

			.blur(function(e){

				_clearInterval();

			})

			.focus(function(e){

				_stateInput();

				_setInterval();

			})

			.keyup(function(e){

				if(flagConvert) {

					_stateInput();

				}

			});

	};

	

})(jQuery);