<?php
/**
 * Base "abstract" class creating reports on your data.
 * 
 * Creating reports
 * ================
 * 
 * Creating a new report is a matter overloading a few key methods
 * 
 *  {@link title()}: Return the title - i18n is your responsibility
 *  {@link description()}: Return the description - i18n is your responsibility
 *  {@link sourceQuery()}: Return a SS_List of the search results
 *  {@link columns()}: Return information about the columns in this report.
 *  {@link parameterFields()}: Return a FieldList of the fields that can be used to filter this
 *  report.
 * 
 * If you wish to modify the report in more extreme ways, you could overload these methods instead.
 * 
 * {@link getReportField()}: Return a FormField in the place where your report's TableListField
 * usually appears.
 * {@link getCMSFields()}: Return the FieldList representing the complete right-hand area of the 
 * report, including the title, description, parameter fields, and results.
 * 
 * Showing reports to the user
 * ===========================
 * 
 * Right now, all subclasses of SS_Report will be shown in the ReportAdmin. In SS3 there is only
 * one place where reports can go, so this class is greatly simplifed from its version in SS2.
 * 
 * @package reports
 */
class SS_Report extends ViewableData
{
    /**
     * This is the title of the report,
     * used by the ReportAdmin templates.
     *
     * @var string
     */
    protected $title = '';

    /**
     * This is a description about what this
     * report does. Used by the ReportAdmin
     * templates.
     *
     * @var string
     */
    protected $description = '';
    
    /**
     * The class of object being managed by this report.
     * Set by overriding in your subclass.
     */
    protected $dataClass = 'SiteTree';

    /**
     * A field that specifies the sort order of this report
     * @var int
     */
    protected $sort = 0;

    /**
     * Reports which should not be collected and returned in get_reports
     * @var array
     */
    public static $excluded_reports = array(
        'SS_Report',
        'SS_ReportWrapper',
        'SideReportWrapper'
    );
    
    /**
     * Return the title of this report.
     * 
     * You have two ways of specifying the description:
     *  - overriding description(), which lets you support i18n 
     *  - defining the $description property
     */
    public function title()
    {
        return $this->title;
    }
    
    /**
     * Allows access to title as a property
     * 
     * @return string
     */
    public function getTitle()
    {
        return $this->title();
    }
    
    /**
     * Return the description of this report.
     * 
     * You have two ways of specifying the description:
     *  - overriding description(), which lets you support i18n 
     *  - defining the $description property
     */
    public function description()
    {
        return $this->description;
    }
    
    /**
     * Return the {@link SQLQuery} that provides your report data.
     */
    public function sourceQuery($params)
    {
        if ($this->hasMethod('sourceRecords')) {
            return $this->sourceRecords()->dataQuery();
        } else {
            user_error("Please override sourceQuery()/sourceRecords() and columns() or, if necessary, override getReportField()", E_USER_ERROR);
        }
    }
    
    /**
     * Return a SS_List records for this report.
     */
    public function records($params)
    {
        if ($this->hasMethod('sourceRecords')) {
            return $this->sourceRecords($params, null, null);
        } else {
            $query = $this->sourceQuery();
            $results = new ArrayList();
            foreach ($query->execute() as $data) {
                $class = $this->dataClass();
                $result = new $class($data);
                $results->push($result);
            }
            return $results;
        }
    }

    /**
     * Return the data class for this report
     */
    public function dataClass()
    {
        return $this->dataClass;
    }


    public function getLink($action = null)
    {
        return Controller::join_links(
            'admin/reports/',
            "$this->class",
            '/', // trailing slash needed if $action is null!
            "$action"
        );
    }


    /**
     * counts the number of objects returned
     * @param Array $params - any parameters for the sourceRecords
     * @return Int
     */
    public function getCount($params = array())
    {
        $sourceRecords = $this->sourceRecords($params, null, null);
        if (!$sourceRecords instanceof SS_List) {
            user_error($this->class."::sourceRecords does not return an SS_List", E_USER_NOTICE);
            return "-1";
        }
        return $sourceRecords->count();
    }

    /**
     * Exclude certain reports classes from the list of Reports in the CMS
     * @param $reportClass Can be either a string with the report classname or an array of reports classnames
     */
    public static function add_excluded_reports($reportClass)
    {
        if (is_array($reportClass)) {
            self::$excluded_reports = array_merge(self::$excluded_reports, $reportClass);
        } else {
            if (is_string($reportClass)) {
                //add to the excluded reports, so this report doesn't get used
                self::$excluded_reports[] = $reportClass;
            }
        }
    }

    /**
     * Return an array of excluded reports. That is, reports that will not be included in
     * the list of reports in report admin in the CMS.
     * @return array
     */
    public static function get_excluded_reports()
    {
        return self::$excluded_reports;
    }

    /**
     * Return the SS_Report objects making up the given list.
     * @return Array of SS_Report objects
     */
    public static function get_reports()
    {
        $reports = ClassInfo::subclassesFor(get_called_class());

        $reportsArray = array();
        if ($reports && count($reports) > 0) {
            //collect reports into array with an attribute for 'sort'
            foreach ($reports as $report) {
                if (in_array($report, self::$excluded_reports)) {
                    continue;
                }   //don't use the SS_Report superclass
                $reflectionClass = new ReflectionClass($report);
                if ($reflectionClass->isAbstract()) {
                    continue;
                }   //don't use abstract classes

                $reportObj = new $report;
                if (method_exists($reportObj, 'sort')) {
                    $reportObj->sort = $reportObj->sort();
                }  //use the sort method to specify the sort field
                $reportsArray[$report] = $reportObj;
            }
        }

        uasort($reportsArray, function ($a, $b) {
            if ($a->sort == $b->sort) {
                return 0;
            } else {
                return ($a->sort < $b->sort) ? -1 : 1;
            }
        });

        return $reportsArray;
    }

    /////////////////////// UI METHODS ///////////////////////


    /**
     * Returns a FieldList with which to create the CMS editing form.
     * You can use the extend() method of FieldList to create customised forms for your other
     * data objects.
     *
     * @uses getReportField() to render a table, or similar field for the report. This
     * method should be defined on the SS_Report subclasses.
     *
     * @return FieldList
     */
    public function getCMSFields()
    {
        $fields = new FieldList();

        if ($title = $this->title()) {
            $fields->push(new LiteralField('ReportTitle', "<h3>{$title}</h3>"));
        }
        
        if ($description = $this->description()) {
            $fields->push(new LiteralField('ReportDescription', "<p>" . $description . "</p>"));
        }
            
        // Add search fields is available
        if ($this->hasMethod('parameterFields') && $parameterFields = $this->parameterFields()) {
            foreach ($parameterFields as $field) {
                // Namespace fields for easier handling in form submissions
                $field->setName(sprintf('filters[%s]', $field->getName()));
                $field->addExtraClass('no-change-track'); // ignore in changetracker
                $fields->push($field);
            }

            // Add a search button
            $fields->push(new FormAction('updatereport', _t('GridField.Filter')));
        }
        
        $fields->push($this->getReportField());

        $this->extend('updateCMSFields', $fields);
        
        return $fields;
    }
    
    public function getCMSActions()
    {
        // getCMSActions() can be extended with updateCMSActions() on a extension
        $actions = new FieldList();
        $this->extend('updateCMSActions', $actions);
        return $actions;
    }
    
    /**
     * Return a field, such as a {@link GridField} that is
     * used to show and manipulate data relating to this report.
     * 
     * Generally, you should override {@link columns()} and {@link records()} to make your report,
     * but if they aren't sufficiently flexible, then you can override this method.
     *
     * @return FormField subclass
     */
    public function getReportField()
    {
        // TODO Remove coupling with global state
        $params = isset($_REQUEST['filters']) ? $_REQUEST['filters'] : array();
        $items = $this->sourceRecords($params, null, null);

        $gridFieldConfig = GridFieldConfig::create()->addComponents(
            new GridFieldToolbarHeader(),
            new GridFieldSortableHeader(),
            new GridFieldDataColumns(),
            new GridFieldPaginator(),
            new GridFieldButtonRow('after'),
            new GridFieldPrintButton('buttons-after-left'),
            new GridFieldExportButton('buttons-after-left')
        );
        $gridField = new GridField('Report', $this->title(), $items, $gridFieldConfig);
        $columns = $gridField->getConfig()->getComponentByType('GridFieldDataColumns');
        $displayFields = array();
        $fieldCasting = array();
        $fieldFormatting = array();

        // Parse the column information
        foreach ($this->columns() as $source => $info) {
            if (is_string($info)) {
                $info = array('title' => $info);
            }
            
            if (isset($info['formatting'])) {
                $fieldFormatting[$source] = $info['formatting'];
            }
            if (isset($info['csvFormatting'])) {
                $csvFieldFormatting[$source] = $info['csvFormatting'];
            }
            if (isset($info['casting'])) {
                $fieldCasting[$source] = $info['casting'];
            }

            if (isset($info['link']) && $info['link']) {
                $link = singleton('CMSPageEditController')->Link('show');
                $fieldFormatting[$source] = '<a href=\"' . $link . '/$ID\">$value</a>';
            }

            $displayFields[$source] = isset($info['title']) ? $info['title'] : $source;
        }
        $columns->setDisplayFields($displayFields);
        $columns->setFieldCasting($fieldCasting);
        $columns->setFieldFormatting($fieldFormatting);

        return $gridField;
    }
    
    /**
     * @param Member $member
     * @return boolean
     */
    public function canView($member = null)
    {
        if (!$member && $member !== false) {
            $member = Member::currentUser();
        }
        
        return true;
    }
    

    /**
     * Return the name of this report, which
     * is used by the templates to render the
     * name of the report in the report tree,
     * the left hand pane inside ReportAdmin.
     *
     * @return string
     */
    public function TreeTitle()
    {
        return $this->title();
    }
}

/**
 * SS_ReportWrapper is a base class for creating report wappers.
 * 
 * Wrappers encapsulate an existing report to alter their behaviour - they are implementations of
 * the standard GoF decorator pattern.
 * 
 * This base class ensure that, by default, wrappers behave in the same way as the report that is
 * being wrapped.  You should override any methods that need to behave differently in your subclass
 * of SS_ReportWrapper.
 * 
 * It also makes calls to 2 empty methods that you can override {@link beforeQuery()} and
 * {@link afterQuery()}
 * 
 * @package reports
 */
abstract class SS_ReportWrapper extends SS_Report
{
    protected $baseReport;

    public function __construct($baseReport)
    {
        $this->baseReport = is_string($baseReport) ? new $baseReport : $baseReport;
        $this->dataClass = $this->baseReport->dataClass();
        parent::__construct();
    }

    public function ID()
    {
        return get_class($this->baseReport) . '_' . get_class($this);
    }

    ///////////////////////////////////////////////////////////////////////////////////////////
    // Filtering

    public function parameterFields()
    {
        return $this->baseReport->parameterFields();
    }

    ///////////////////////////////////////////////////////////////////////////////////////////
    // Columns

    public function columns()
    {
        return $this->baseReport->columns();
    }

    ///////////////////////////////////////////////////////////////////////////////////////////
    // Querying

    /**
     * Override this method to perform some actions prior to querying.
     */
    public function beforeQuery($params)
    {
    }

    /**
     * Override this method to perform some actions after querying.
     */
    public function afterQuery()
    {
    }

    public function sourceQuery($params)
    {
        if ($this->baseReport->hasMethod('sourceRecords')) {
            // The default implementation will create a fake query from our sourceRecords() method
            return parent::sourceQuery($params);
        } elseif ($this->baseReport->hasMethod('sourceQuery')) {
            $this->beforeQuery($params);
            $query = $this->baseReport->sourceQuery($params);
            $this->afterQuery();
            return $query;
        } else {
            user_error("Please override sourceQuery()/sourceRecords() and columns() in your base report", E_USER_ERROR);
        }
    }

    public function sourceRecords($params = array(), $sort = null, $limit = null)
    {
        $this->beforeQuery($params);
        $records = $this->baseReport->sourceRecords($params, $sort, $limit);
        $this->afterQuery();
        return $records;
    }


    ///////////////////////////////////////////////////////////////////////////////////////////
    // Pass-through

    public function title()
    {
        return $this->baseReport->title();
    }
    
    public function group()
    {
        return $this->baseReport->hasMethod('group') ? $this->baseReport->group() : 'Group';
    }
    
    public function sort()
    {
        return $this->baseReport->hasMethod('sort') ? $this->baseReport->sort() : 0;
    }

    public function description()
    {
        return $this->baseReport->description();
    }

    public function canView($member = null)
    {
        return $this->baseReport->canView($member);
    }
}