<?php
/**
 * This program 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; under version 2
 * of the License (non-upgradable).
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2013 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
 *
 */

/**
 * This helper aims at providing utility methods to render
 * reports into HTML.
 *
 * @author Jérôme Bogaerts <jerome@taotesting.com>
 *
 */
class tao_helpers_report_Rendering
{
    
    /**
     * Render a common_report_Report object into an HTML string output.
     *
     * @param common_report_Report $report A report to be rendered
     * @return string The HTML rendering.
     */
    public static function render(common_report_Report $report)
    {
        
        $stack = new SplStack();
        $renderingStack = new SplStack();
        $traversed = [];
        
        $stack->push($report);
        $nesting = 0;
        
        while ($stack->count() > 0) {
            $current = $stack->pop();
            
            if (in_array($current, $traversed, true) === false && $current->hasChildren() === true) {
                $nesting++;
                // -- Hierarchical report, 1st pass (descending).
                
                // Repush report for a 2ndpass.
                $stack->push($current);
                
                // Tag as already traversed.
                $traversed[] = $current;
                
                // Push the children for a 1st pass.
                foreach ($current as $child) {
                    $stack->push($child);
                }
            } elseif (in_array($current, $traversed, true) === true && $current->hasChildren() === true) {
                $nesting--;
                // -- Hierachical report, 2nd pass (ascending).
                
                // Get the nested renderings of the current report.
                $children = [];
                foreach ($current as $child) {
                    $children[] = $renderingStack->pop();
                }
                
                $renderingStack->push(self::renderReport($current, $children, $nesting));
            } else {
                // -- Leaf report, 1st & single pass.
                $renderingStack->push(self::renderReport($current, [], $nesting, true));
            }
        }
        
        return $renderingStack->pop();
    }
    
    /**
     * Contains the logic to render a report and its children.
     *
     * @param common_report_Report $report A report to be rendered.
     * @param array $childRenderedReports An array of strings containing the separate rendering of $report's child reports.
     * @param integer $nesting The current nesting level (root = 0).
     * @return string The HTML output of $report.
     */
    private static function renderReport(common_report_Report $report, array $childRenderedReports = [], $nesting = 0, $leaf = false)
    {
        
        switch ($report->getType()) {
            case common_report_Report::TYPE_SUCCESS:
                $typeClass = 'success';
                break;
            
            case common_report_Report::TYPE_WARNING:
                $typeClass = 'warning';
                break;
            
            case common_report_Report::TYPE_ERROR:
                $typeClass = 'error';
                break;
            
            default:
                $typeClass = 'info';
                break;
        }
        
        $openingTag = '<div class="feedback-' . $typeClass . ' feedback-nesting-' . $nesting . ' ' . (($leaf === true) ? 'leaf' : 'hierarchical') . ' tao-scope">';
        $leafIcon = ($leaf === true) ? ' leaf-icon' : ' hierarchical-icon';
        $icon = '<span class="icon-' . $typeClass . $leafIcon . '"></span>';
        $message = nl2br(_dh($report->__toString()));
        $endingTag = '</div>';
        $okButton = '<p><button id="import-continue" class="btn-info"><span class="icon-right"></span>' . __("Continue") . '</button></p>';
        
        // Put all the children renderings together.
        $content = implode('', $childRenderedReports);
        return $openingTag . $icon . $message . $content . (($nesting != 0) ? '' : $okButton) . $endingTag;
    }
    
    /**
     * Contains the logic to render a report and its children to the command line
     *
     * @deprecated
     * @param common_report_Report $report A report to be rendered.
     * @param integer $intend the intend of the message.
     * @return string The command line output of $report.
     */
    public static function renderToCommandline(common_report_Report $report, $intend = 0)
    {
        return helpers_Report::renderToCommandLine($report, helpers_Report::AUTOSENSE, $intend);
    }
}