/***
 * Abstract Strategy
 */
Ext.ux.form.Spinner.Strategy = function(config){
	Ext.apply(this, config);
};

Ext.extend(Ext.ux.form.Spinner.Strategy, Ext.util.Observable, {
	defaultValue : 0,
	minValue : undefined,
	maxValue : undefined,
	incrementValue : 1,
	alternateIncrementValue : 5,
	
	onSpinUp : function(field){
		this.spin(field, false, false);
	},

	onSpinDown : function(field){
		this.spin(field, true, false);
	},

	onSpinUpAlternate : function(field){
		this.spin(field, false, true);
	},

	onSpinDownAlternate : function(field){
		this.spin(field, true, true);
	},

	spin : function(field, down, alternate){
		//extend
	},

	fixBoundries : function(value){
		return value;
		//overwrite
	}
	
});

/***
 * Concrete Strategy: Numbers
 */
Ext.ux.form.Spinner.NumberStrategy = function(config){
	Ext.ux.form.Spinner.NumberStrategy.superclass.constructor.call(this, config);
};

Ext.extend(Ext.ux.form.Spinner.NumberStrategy, Ext.ux.form.Spinner.Strategy, {

	spin : function(field, down, alternate){
		Ext.ux.form.Spinner.NumberStrategy.superclass.spin.call(this, field, down, alternate);

		var v = parseFloat(field.getValue());
		var incr = (alternate == true) ? this.alternateIncrementValue : this.incrementValue;

		(down == true) ? v -= incr : v += incr ;
		v = (isNaN(v)) ? this.defaultValue : v;
		v = this.fixBoundries(v);
		field.setRawValue(v);
	},

	fixBoundries : function(value){
		var v = value;

		if(this.minValue != undefined && v < this.minValue){
			v = this.minValue;
		}
		if(this.maxValue != undefined && v > this.maxValue){
			v = this.maxValue;
		}

		return v;
	}
});


/***
 * Concrete Strategy: Date
 */
Ext.ux.form.Spinner.DateStrategy = function(config){
	Ext.ux.form.Spinner.DateStrategy.superclass.constructor.call(this, config);
};

Ext.extend(Ext.ux.form.Spinner.DateStrategy, Ext.ux.form.Spinner.Strategy, {
	defaultValue : new Date(),
	format : "Y-m-d",
	incrementValue : 1,
	incrementConstant : Date.DAY,
	alternateIncrementValue : 1,
	alternateIncrementConstant : Date.MONTH,

	spin : function(field, down, alternate){
		Ext.ux.form.Spinner.DateStrategy.superclass.spin.call(this);

		var v = field.getValue();
		v = Date.parseDate(v, this.format);
		var dir = (down == true) ? -1 : 1 ;
		var incr = (alternate == true) ? this.alternateIncrementValue : this.incrementValue;
		var dtconst = (alternate == true) ? this.alternateIncrementConstant : this.incrementConstant;

		if(typeof this.defaultValue == 'string'){
			this.defaultValue = Date.parseDate(this.defaultValue, this.format);
		}

		v = (v) ? v.add(dtconst, dir*incr) : this.defaultValue;

		v = this.fixBoundries(v);
		field.setRawValue(v.format(this.format));
	},

	//private
	fixBoundries : function(date){
		var dt = date;
		var min = (typeof this.minValue == 'string') ? Date.parseDate(this.minValue, this.format) : this.minValue ;
		var max = (typeof this.maxValue == 'string') ? Date.parseDate(this.maxValue, this.format) : this.maxValue ;

		if(this.minValue != undefined && dt < min){
			dt = min;
		}
		if(this.maxValue != undefined && dt > max){
			dt = max;
		}

		return dt;
	}
});


/***
 * Concrete Strategy: Time
 */
Ext.ux.form.Spinner.TimeStrategy = function(config){
	Ext.ux.form.Spinner.TimeStrategy.superclass.constructor.call(this, config);
};

Ext.extend(Ext.ux.form.Spinner.TimeStrategy, Ext.ux.form.Spinner.DateStrategy, {
	format : "H:i",
	incrementValue : 1,
	incrementConstant : Date.MINUTE,
	alternateIncrementValue : 1,
	alternateIncrementConstant : Date.HOUR
});