var SelectorCellFormatter = function(row, cell, value, columnDef, dataContext) {
    return (!dataContext ? "" : row);
};

var PercentCompleteCellFormatter = function(row, cell, value, columnDef, dataContext) {
    if (value == null || value === "") 
        return "-";
    else if (value < 50) 
        return "<span style='color:red;font-weight:bold;'>" + value + "%</span>";
    else 
        return "<span style='color:green'>" + value + "%</span>";
};

var GraphicalPercentCompleteCellFormatter = function(row, cell, value, columnDef, dataContext) {
    if (value == null || value === "") 
        return "";
    
	var color;
	
	if (value < 30)
		color = "red";
	else if (value < 70)
		color = "silver";
	else 
		color = "green";
	
    return "<span style='display:inline-block;background:" + color + ";height:6px;width:" + value + "%'></span>";
};

var YesNoCellFormatter = function(row, cell, value, columnDef, dataContext) {
    return value ? "Yes" : "No";
};

var BoolCellFormatter = function(row, cell, value, columnDef, dataContext) {
    return value ? "<img src='../images/tick.png'>" : "";
};			
	
var TaskNameFormatter = function(row, cell, value, columnDef, dataContext) {
    // todo:  html encode
    var spacer = "<span style='display:inline-block;height:1px;width:" + (2 + 15 * dataContext["indent"]) + "px'></span>";
    return spacer + " <img src='../images/expand.gif'>&nbsp;" + value;
};

var ResourcesFormatter = function(row, cell, value, columnDef, dataContext) {
    var resources = dataContext["resources"];
    
    if (!resources || resources.length == 0) 
        return "";

	if (columnDef.width < 50)
		return (resources.length > 1 ? "<center><img src='../images/user_identity_plus.gif' " : "<center><img src='../images/user_identity.gif' ") + 
				" title='" + resources.join(", ") + "'></center>";
	else
		return resources.join(", ");
};

var StarFormatter = function(row, cell, value, columnDef, dataContext) {
    return (value) ? "<img src='../images/bullet_star.png' align='absmiddle'>" : "";
};






var TextCellEditor = function($container, columnDef, value, dataContext) {
    var $input;
    var defaultValue = value;
    var scope = this;
    
    this.init = function() {
        $input = $("<INPUT type=text class='editor-text' />");
        
        if (value != null) 
        {
            $input[0].defaultValue = value;
            $input.val(defaultValue);
        }
        
        $input.appendTo($container);
        $input.focus().select();
    }
    
    this.destroy = function() {
        $input.remove();
    }
    
    this.focus = function() {
        $input.focus();
    }
    
    this.setValue = function(value) {
        $input.val(value);
        defaultValue = value;
    }
    
    this.getValue = function() {
        return $input.val();
    }
    
    this.isValueChanged = function() {
        return (!($input.val() == "" && defaultValue == null)) && ($input.val() != defaultValue);
    }
    
    this.validate = function() {
        if (columnDef.validator) 
        {
            var validationResults = columnDef.validator(scope.getValue());
            if (!validationResults.valid) 
                return validationResults;
        }
        
        return {
            valid: true,
            msg: null
        };
    }
    
    this.init();
}

var DateCellEditor = function($container, columnDef, value, dataContext) {
    var $input;
    var defaultValue = value;
    var scope = this;
    
    this.init = function() {
        $input = $("<INPUT type=text class='editor-text' />");
        
        if (value != null) 
        {
            $input[0].defaultValue = value;
            $input.val(defaultValue);
        }
        
        $input.appendTo($container);
        $input.focus().select();
        $input.datepicker({
            showOn: "button",
            buttonImageOnly: true,
            buttonImage: "../images/calendar.gif"
        });
        $input.width($input.width() - 18);
    }
    
    
    this.destroy = function() {
		$input.datepicker("hide");
        $input.datepicker("destroy");
        $input.remove();
    }
    
    
    this.focus = function() {
        $input.focus();
    }
    
    this.setValue = function(value) {
        $input.val(value);
        defaultValue = value;
    }
    
    this.getValue = function() {
        return $input.val();
    }
    
    this.isValueChanged = function() {
        return (!($input.val() == "" && defaultValue == null)) && ($input.val() != defaultValue);
    }
    
    this.validate = function() {
        return {
            valid: true,
            msg: null
        };
    }
    
    this.init();
}

var YesNoSelectCellEditor = function($container, columnDef, value, dataContext) {
    var $select;
    var defaultValue = value;
    var scope = this;
    
    this.init = function() {
        $select = $("<SELECT tabIndex='0' class='editor-yesno'><OPTION value='yes'>Yes</OPTION><OPTION value='no'>No</OPTION></SELECT>");
        
        if (defaultValue) 
            $select.val('yes');
        else 
            $select.val('no');
        
        $select.appendTo($container);
        
        $select.focus();
    }
    
    
    this.destroy = function() {
        $select.remove();
    }
    
    
    this.focus = function() {
        $select.focus();
    }
    
    this.setValue = function(value) {
        $select.val(value);
        defaultValue = value;
    }
    
    this.getValue = function() {
        return ($select.val() == 'yes');
    }
    
    this.isValueChanged = function() {
        return ($select.val() != defaultValue);
    }
    
    this.validate = function() {
        return {
            valid: true,
            msg: null
        };
    }
    
    this.init();
}

var YesNoCheckboxCellEditor = function($container, columnDef, value, dataContext) {
    var $select;
    var defaultValue = value;
    var scope = this;
    
    this.init = function() {
        $select = $("<INPUT type=checkbox value='true' class='editor-checkbox' hideFocus>");
        
        if (defaultValue) 
            $select.attr("checked", "checked");
        
        $select.appendTo($container);
        $select.focus();
    }
    
    
    this.destroy = function() {
        $select.remove();
    }
    
    
    this.focus = function() {
        $select.focus();
    }
    
    this.setValue = function(value) {
        if (value) 
            $select.attr("checked", "checked");
        else 
            $select.removeAttr("checked");
        
        defaultValue = value;
    }
    
    this.getValue = function() {
        return $select.attr("checked");
    }
    
    this.isValueChanged = function() {
        return (scope.getValue() != defaultValue);
    }
    
    this.validate = function() {
        return {
            valid: true,
            msg: null
        };
    }
    
    this.init();
}

var PercentCompleteCellEditor = function($container, columnDef, value, dataContext) {
    var $input, $picker;
    var defaultValue = value;
    var scope = this;
    
    this.init = function() {
        $input = $("<INPUT type=text class='editor-percentcomplete' />");
        
        if (value != null) 
        {
            $input[0].defaultValue = value;
            $input.val(defaultValue);
        }
        
        $input.width(columnDef.width - 20);
        $input.appendTo($container);
        
        $picker = $("<div class='editor-percentcomplete-picker' />").appendTo($container);
        
        $picker.append("<div class='editor-percentcomplete-helper'><div class='editor-percentcomplete-wrapper'><div class='editor-percentcomplete-slider' /><div class='editor-percentcomplete-buttons' /></div></div>");
        
        $picker.find(".editor-percentcomplete-buttons").append("<button val=0>Not started</button><br/><button val=50>In Progress</button><br/><button val=100>Complete</button>");
        
        $input.focus().select();
        
        $picker.find(".editor-percentcomplete-slider").slider({
			orientation: "vertical",
			range: "min",
            value: defaultValue,
            slide: function(event, ui) {
                $input.val(ui.value)
            }
        });
        
        $picker.find(".editor-percentcomplete-buttons button").bind("click", function(e) {
            $input.val($(this).attr("val"));
            $picker.find(".editor-percentcomplete-slider").slider("value", $(this).attr("val"));
        })
    }
    
    
    this.destroy = function() {
        $input.remove();
        $picker.remove();
    }
    
    
    this.focus = function() {
        $input.focus();
    }
    
    this.setValue = function(value) {
        $input.val(value);
        defaultValue = value;
    }
    
    this.getValue = function() {
		var val = $.trim($input.val());
        return (val == "") ? 0 : parseInt($input.val(), 10);
    }
    
    this.isValueChanged = function() {
        return (!($input.val() == "" && defaultValue == null)) && ($input.val() != defaultValue);
    }
    
    this.validate = function() {
        if (isNaN($input.val())) 
            return {
                valid: false,
                msg: "Please enter a valid positive number"
            };
        
        return {
            valid: true,
            msg: null
        };
    }
    
    this.init();
}

var TaskNameCellEditor = function($container, columnDef, value, dataContext) {
    var $input;
    var defaultValue = value;
    var scope = this;
    
    this.init = function() {
        $input = $("<INPUT type=text class='editor-text' />");
        
        if (value != null) 
        {
            $input[0].defaultValue = value;
            $input.val(defaultValue);
        }
        
        $input.appendTo($container);
        $input.focus().select();
    }
    
    this.destroy = function() {
        $input.remove();
    }
    
    this.focus = function() {
        $input.focus();
    }
    
    this.setValue = function(value) {
        $input.val(value);
        defaultValue = value;
    }
    
    this.getValue = function() {
        return $input.val();
    }
    
    this.isValueChanged = function() {
        return (!($input.val() == "" && defaultValue == null)) && ($input.val() != defaultValue);
    }
    
    this.validate = function() {
        if (columnDef.validator) 
        {
            var validationResults = columnDef.validator(scope.getValue());
            if (!validationResults.valid) 
                return validationResults;
        }
        
        if ($input.val() == "") 
            return {
                valid: false,
                msg: "This field cannot be empty"
            };
        
        return {
            valid: true,
            msg: null
        };
    }
    
    this.init();
}

var ResourcesCellEditor = function($container, columnDef, value, dataContext) {
	var $input;
    var defaultValue = [];
    var scope = this;
    
    this.init = function() {
        $input = $("<INPUT type=text class='editor-text' />");
        
        var resources = dataContext ? dataContext["resources"] : null;
        
        defaultValue = resources ? resources.concat() : [];
        
        if (resources != null) 
        {
            $input[0].defaultValue = defaultValue.join(", ");
            $input.val(defaultValue.join(", "));
        }
        
        $input.appendTo($container);
        $input.focus().select();
    }
    
    this.destroy = function() {
        $input.remove();
    }
    
    this.focus = function() {
        $input.focus();
    }
    
    this.setValue = function(value) {
        defaultValue = value ? value : [];
        $input.val(defaultValue.join(", "));
    }
    
    this.getValue = function() {
        if ($input.val() == "") 
            return [];
        
        var names = $input.val().split(",");
        
        for (var i = 0; i < names.length; i++) 
            names[i] = $.trim(names[i]);
        
        return names;
    }
    
    this.isValueChanged = function() {
        // todo:  implement
        return true;
    }
    
    this.validate = function() {
        if (columnDef.validator) 
        {
            var validationResults = columnDef.validator(scope.getValue());
            if (!validationResults.valid) 
                return validationResults;
        }
        
        // todo:  implement
        
        return {
            valid: true,
            msg: null
        };
    }
    
    this.init();
}

var StarCellEditor = function($container, columnDef, value, dataContext) {
    var $input;
    var defaultValue = value;
    var scope = this;
    
	function toggle(e) {
		if (e.type == "keydown" && e.which != 32) return;
		
		if ($input.css("opacity") == "1")
			$input.css("opacity", 0.5);
		else
			$input.css("opacity", 1);
		
		e.preventDefault();
		e.stopPropagation();
		return false;
	}
	
    this.init = function() {
        $input = $("<IMG src='../images/bullet_star.png' align=absmiddle tabIndex=0 title='Click or press Space to toggle' />");
        
        if (defaultValue) 
            $input.css("opacity", 1);
		else
            $input.css("opacity", 0.5);

		$input.bind("click keydown", toggle);
        
        $input.appendTo($container);
        $input.focus();
    }
    
    this.destroy = function() {
		$input.unbind("click keydown", toggle);
        $input.remove();
    }
    
    this.focus = function() {
        $input.focus();
    }
    
    this.setValue = function(value) {
        defaultValue = value;
		
        if (defaultValue) 
            $input.css("opacity", 1);
		else
            $input.css("opacity", 0.2);		
    }
    
    this.getValue = function() {
        return $input.css("opacity") == "1";
    }
    
    this.isValueChanged = function() {
        return (defaultValue == true) != scope.getValue();
    }
    
    this.validate = function() {
        return {
            valid: true,
            msg: null
        };
    }
    
    this.init();
}