// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
/* global SELECTOR */

/**
 * Provides an in browser PDF editor.
 *
 * @module moodle-assignfeedback_editpdf-editor
 */

/**
 * Class representing a stamp.
 *
 * @namespace M.assignfeedback_editpdf
 * @class annotationstamp
 * @extends M.assignfeedback_editpdf.annotation
 */
var ANNOTATIONSTAMP = function(config) {
    ANNOTATIONSTAMP.superclass.constructor.apply(this, [config]);
};

ANNOTATIONSTAMP.NAME = "annotationstamp";
ANNOTATIONSTAMP.ATTRS = {};

Y.extend(ANNOTATIONSTAMP, M.assignfeedback_editpdf.annotation, {
    /**
     * Draw a stamp annotation
     * @protected
     * @method draw
     * @return M.assignfeedback_editpdf.drawable
     */
    draw: function() {
        var drawable = new M.assignfeedback_editpdf.drawable(this.editor),
            drawingcanvas = this.editor.get_dialogue_element(SELECTOR.DRAWINGCANVAS),
            node,
            position;

        position = this.editor.get_window_coordinates(new M.assignfeedback_editpdf.point(this.x, this.y));
        node = Y.Node.create('<div/>');
        node.addClass('annotation');
        node.addClass('stamp');
        node.setStyles({
            'position': 'absolute',
            'display': 'inline-block',
            'backgroundImage': 'url(' + this.editor.get_stamp_image_url(this.path) + ')',
            'width': (this.endx - this.x),
            'height': (this.endy - this.y),
            'backgroundSize': '100% 100%'
        });

        drawingcanvas.append(node);
        node.setX(position.x);
        node.setY(position.y);
        drawable.store_position(node, position.x, position.y);

        // Bind events only when editing.
        if (!this.editor.get('readonly')) {
            // Pass through the event handlers on the div.
            node.on('gesturemovestart', this.editor.edit_start, null, this.editor);
            node.on('gesturemove', this.editor.edit_move, null, this.editor);
            node.on('gesturemoveend', this.editor.edit_end, null, this.editor);
        }

        drawable.nodes.push(node);

        this.drawable = drawable;
        return ANNOTATIONSTAMP.superclass.draw.apply(this);
    },

    /**
     * Draw the in progress edit.
     *
     * @public
     * @method draw_current_edit
     * @param M.assignfeedback_editpdf.edit edit
     */
    draw_current_edit: function(edit) {
        var bounds = new M.assignfeedback_editpdf.rect(),
            drawable = new M.assignfeedback_editpdf.drawable(this.editor),
            drawingregion = this.editor.get_dialogue_element(SELECTOR.DRAWINGREGION),
            node,
            position;

        bounds.bound([edit.start, edit.end]);
        position = this.editor.get_window_coordinates(new M.assignfeedback_editpdf.point(bounds.x, bounds.y));

        node = Y.Node.create('<div/>');
        node.addClass('annotation');
        node.addClass('stamp');
        node.setStyles({
            'position': 'absolute',
            'display': 'inline-block',
            'backgroundImage': 'url(' + this.editor.get_stamp_image_url(edit.stamp) + ')',
            'width': bounds.width,
            'height': bounds.height,
            'backgroundSize': '100% 100%'
        });

        drawingregion.append(node);
        node.setX(position.x);
        node.setY(position.y);
        drawable.store_position(node, position.x, position.y);

        drawable.nodes.push(node);

        return drawable;
    },

    /**
     * Promote the current edit to a real annotation.
     *
     * @public
     * @method init_from_edit
     * @param M.assignfeedback_editpdf.edit edit
     * @return bool if width/height is more than min. required.
     */
    init_from_edit: function(edit) {
        var bounds = new M.assignfeedback_editpdf.rect();
        bounds.bound([edit.start, edit.end]);

        if (bounds.width < 40) {
            bounds.width = 40;
        }
        if (bounds.height < 40) {
            bounds.height = 40;
        }
        this.gradeid = this.editor.get('gradeid');
        this.pageno = this.editor.currentpage;
        this.x = bounds.x;
        this.y = bounds.y;
        this.endx = bounds.x + bounds.width;
        this.endy = bounds.y + bounds.height;
        this.colour = edit.annotationcolour;
        this.path = edit.stamp;

        // Min width and height is always more than 40px.
        return true;
    },

    /**
     * Move an annotation to a new location.
     * @public
     * @param int newx
     * @param int newy
     * @method move_annotation
     */
    move: function(newx, newy) {
        var diffx = newx - this.x,
            diffy = newy - this.y;

        this.x += diffx;
        this.y += diffy;
        this.endx += diffx;
        this.endy += diffy;

        if (this.drawable) {
            this.drawable.erase();
        }
        this.editor.drawables.push(this.draw());
    }

});

M.assignfeedback_editpdf = M.assignfeedback_editpdf || {};
M.assignfeedback_editpdf.annotationstamp = ANNOTATIONSTAMP;
