//============================================================================
// Cell
//============================================================================

var IPython = (function (IPython) {

    var utils = IPython.utils;

    var Cell = function (notebook) {
        this.notebook = notebook;
        this.selected = false;
        this.element;
        this.create_element();
        if (this.element !== undefined) {
            this.element.data("cell", this);
            this.bind_events();
        }
        this.cell_id = utils.uuid();
    };


    Cell.prototype.select = function () {
        this.element.addClass('ui-widget-content ui-corner-all');
        this.selected = true;
        // TODO: we need t test across browsers to see if both of these are needed.
        // In the meantime, there should not be any harm in having them both.
        this.element.find('textarea').trigger('focusin');
        this.element.find('textarea').trigger('focus');
    };


    Cell.prototype.unselect = function () {
        this.element.removeClass('ui-widget-content ui-corner-all');
        this.selected = false;
    };


    Cell.prototype.bind_events = function () {
        var that = this;
        var nb = that.notebook
        that.element.click(function (event) {
            if (that.selected === false) {
                nb.select(nb.find_cell_index(that));
            };
        });
        that.element.focusin(function (event) {
            if (that.selected === false) {
                nb.select(nb.find_cell_index(that));
            };
        });
    };

    Cell.prototype.grow = function(element) {
        // Grow the cell by hand. This is used upon reloading from JSON, when the
        // autogrow handler is not called.
        var dom = element.get(0);
        var lines_count = 0;
        // modified split rule from
        // http://stackoverflow.com/questions/2035910/how-to-get-the-number-of-lines-in-a-textarea/2036424#2036424
        var lines = dom.value.split(/\r|\r\n|\n/);
        lines_count = lines.length;
        if (lines_count >= 1) {
            dom.rows = lines_count;
        } else {
            dom.rows = 1;
        }
    };


    // Subclasses must implement create_element.
    Cell.prototype.create_element = function () {};

    IPython.Cell = Cell;

    return IPython;

}(IPython));