<?php

/**
 * Matomo - free/libre analytics platform
 *
 * @link    https://matomo.org
 * @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 */

namespace Piwik\Plugin;

use Piwik\ArchiveProcessor;
use Piwik\Cache;
use Piwik\CacheId;
use Piwik\Config as PiwikConfig;
use Piwik\Container\StaticContainer;
use Piwik\ErrorHandler;
use Piwik\Log;
use Piwik\Piwik;

/**
 * The base class that should be extended by plugins that compute their own
 * analytics data.
 *
 * Descendants should implement the {@link aggregateDayReport()} and {@link aggregateMultipleReports()}
 * methods.
 *
 * Both of these methods should persist analytics data using the {@link \Piwik\ArchiveProcessor}
 * instance returned by {@link getProcessor()}. The {@link aggregateDayReport()} method should
 * compute analytics data using the {@link \Piwik\DataAccess\LogAggregator} instance
 * returned by {@link getLogAggregator()}.
 *
 * ### Examples
 *
 * **Extending Archiver**
 *
 *     class MyArchiver extends Archiver
 *     {
 *         public function aggregateDayReport()
 *         {
 *             $logAggregator = $this->getLogAggregator();
 *
 *             $data = $logAggregator->queryVisitsByDimension(...);
 *
 *             $dataTable = new DataTable();
 *             $dataTable->addRowsFromSimpleArray($data);
 *
 *             $archiveProcessor = $this->getProcessor();
 *             $archiveProcessor->insertBlobRecords('MyPlugin_myReport', $dataTable->getSerialized(500));
 *         }
 *
 *         public function aggregateMultipleReports()
 *         {
 *             $archiveProcessor = $this->getProcessor();
 *             $archiveProcessor->aggregateDataTableRecords('MyPlugin_myReport', 500);
 *         }
 *     }
 *
 * @api
 */
class Archiver
{
    public static $ARCHIVE_DEPENDENT = true;

    /**
     * @var \Piwik\ArchiveProcessor
     */
    private $processor;

    /**
     * @var bool
     */
    private $enabled;

    /**
     * @var mixed
     */
    protected $maximumRows;

    /**
     * Used if a plugin has RecordBuilders but no Archiver subclass.
     *
     * @var string|null
     */
    private $pluginName = null;

    /**
     * Constructor.
     *
     * @param ArchiveProcessor $processor The ArchiveProcessor instance to use when persisting archive
     *                                    data.
     */
    public function __construct(ArchiveProcessor $processor, ?string $pluginName = null)
    {
        $this->maximumRows = PiwikConfig::getInstance()->General['datatable_archiving_maximum_rows_standard'];
        $this->processor = $processor;
        $this->enabled = true;
        $this->pluginName = $pluginName;
    }

    private function getPluginName(): string
    {
        return $this->pluginName ?: Piwik::getPluginNameOfMatomoClass(get_class($this));
    }

    /**
     * @return ArchiveProcessor\RecordBuilder[]
     * @throws \DI\DependencyException
     * @throws \DI\NotFoundException
     */
    private function getRecordBuilders(string $pluginName): array
    {
        $transientCache = Cache::getTransientCache();
        $cacheKey = CacheId::siteAware('Archiver.RecordBuilders') . '.' . $pluginName;

        $recordBuilders = $transientCache->fetch($cacheKey);
        if ($recordBuilders === false) {
            $recordBuilderClasses = $this->getAllRecordBuilderClasses();

            // only select RecordBuilders for the selected plugin
            $recordBuilderClasses = array_filter($recordBuilderClasses, function ($className) use ($pluginName) {
                return Piwik::getPluginNameOfMatomoClass($className) == $pluginName;
            });

            $recordBuilders = array_map(function ($className) {
                return StaticContainer::getContainer()->make($className);
            }, $recordBuilderClasses);

            /**
             * Triggered to add new RecordBuilders that cannot be picked up automatically by the platform.
             * If you define RecordBuilders that take a parameter, for example, an ID to an entity your plugin
             * manages, use this event to add instances of that RecordBuilder to the global list.
             *
             * **Example**
             *
             *     public function addRecordBuilders(&$recordBuilders)
             *     {
             *         $recordBuilders[] = new MyParameterizedRecordBuilder($idOfThingToArchiveFor);
             *     }
             *
             * @param ArchiveProcessor\RecordBuilder[] $recordBuilders An array of RecordBuilder instances
             * @api
             */
            Piwik::postEvent('Archiver.addRecordBuilders', [&$recordBuilders], false, [$pluginName]);

            $transientCache->save($cacheKey, $recordBuilders);
        }

        /**
         * Triggered to filter / restrict reports.
         *
         * **Example**
         *
         *     public function filterRecordBuilders(&$recordBuilders)
         *     {
         *         foreach ($reports as $index => $recordBuilder) {
         *              if ($recordBuilders instanceof AnotherPluginRecordBuilder) {
         *                  unset($reports[$index]);
         *              }
         *         }
         *     }
         *
         * @param ArchiveProcessor\RecordBuilder[] $recordBuilders An array of RecordBuilder instances
         * @api
         */
        Piwik::postEvent('Archiver.filterRecordBuilders', [&$recordBuilders]);

        return $recordBuilders;
    }

    private function filterRecordBuildersByRequestedRecords(array $recordBuilders, array $requestedReports): array
    {
        // No record builders might be provided if the plugin does not (yet) provide any
        if (empty($recordBuilders)) {
            return $recordBuilders;
        }

        if (!empty($requestedReports)) {
            $recordBuilders = array_filter($recordBuilders, function (ArchiveProcessor\RecordBuilder $builder) use ($requestedReports) {
                return $builder->isBuilderForAtLeastOneOf($this->processor, $requestedReports);
            });
        }

        if (0 === count($recordBuilders)) {
            Log::debug(
                'Archiver: No record builders found for requested records %s',
                implode(',', $this->processor->getParams()->getArchiveOnlyReportAsArray())
            );
        }

        return $recordBuilders;
    }

    /**
     * @ignore
     */
    final public function callAggregateDayReport()
    {
        try {
            ErrorHandler::pushFatalErrorBreadcrumb(static::class);

            $pluginName = $this->getPluginName();

            if (Manager::getInstance()->isPluginLoaded($pluginName)) {
                $allRecordBuilders = $this->getRecordBuilders($pluginName);
                $recordBuilders = $this->filterRecordBuildersByRequestedRecords($allRecordBuilders, $this->processor->getParams()->getArchiveOnlyReportAsArray());

                foreach ($recordBuilders as $recordBuilder) {
                    if (!$recordBuilder->isEnabled($this->getProcessor())) {
                        continue;
                    }

                    $originalQueryHint = $this->getProcessor()->getLogAggregator()->getQueryOriginHint();
                    $newQueryHint = $originalQueryHint . ' ' . $recordBuilder->getQueryOriginHint();
                    try {
                        $this->getProcessor()->getLogAggregator()->setQueryOriginHint($newQueryHint);
                        $recordBuilder->buildFromLogs($this->getProcessor());
                    } finally {
                        $this->getProcessor()->getLogAggregator()->setQueryOriginHint($originalQueryHint);
                    }
                }
            }

            $this->aggregateDayReport();

            $this->processDependentArchivesForPlugins();
        } finally {
            ErrorHandler::popFatalErrorBreadcrumb();
        }
    }

    /**
     * @ignore
     */
    final public function callAggregateMultipleReports()
    {
        try {
            ErrorHandler::pushFatalErrorBreadcrumb(static::class);

            $pluginName = $this->getPluginName();

            if (Manager::getInstance()->isPluginLoaded($pluginName)) {
                $allRecordBuilders = $this->getRecordBuilders($pluginName);
                $recordBuilders = $this->filterRecordBuildersByRequestedRecords($allRecordBuilders, $this->processor->getParams()->getArchiveOnlyReportAsArray());

                foreach ($recordBuilders as $recordBuilder) {
                    if (!$recordBuilder->isEnabled($this->getProcessor())) {
                        continue;
                    }

                    $originalQueryHint = $this->getProcessor()->getLogAggregator()->getQueryOriginHint();
                    $newQueryHint = $originalQueryHint . ' ' . $recordBuilder->getQueryOriginHint();
                    try {
                        $this->getProcessor()->getLogAggregator()->setQueryOriginHint($newQueryHint);
                        $recordBuilder->buildForNonDayPeriod($this->getProcessor());
                    } finally {
                        $this->getProcessor()->getLogAggregator()->setQueryOriginHint($originalQueryHint);
                    }
                }
            }

            $this->aggregateMultipleReports();

            $this->processDependentArchivesForPlugins();
        } finally {
            ErrorHandler::popFatalErrorBreadcrumb();
        }
    }

    /**
     * Archives data for a day period.
     *
     * Implementations of this method should do more computation intensive activities such
     * as aggregating data across log tables. Since this method only deals w/ data logged for a day,
     * aggregating individual log table rows isn't a problem. Doing this for any larger period,
     * however, would cause performance degradation.
     *
     * Aggregate log table rows using a {@link Piwik\DataAccess\LogAggregator} instance. Get a
     * {@link Piwik\DataAccess\LogAggregator} instance using the {@link getLogAggregator()} method.
     */
    public function aggregateDayReport()
    {
        // empty
    }

    /**
     * Archives data for a non-day period.
     *
     * Implementations of this method should only aggregate existing reports of subperiods of the
     * current period. For example, it is more efficient to aggregate reports for each day of a
     * week than to aggregate each log entry of the week.
     *
     * Use {@link Piwik\ArchiveProcessor::aggregateNumericMetrics()} and {@link Piwik\ArchiveProcessor::aggregateDataTableRecords()}
     * to aggregate archived reports. Get the {@link Piwik\ArchiveProcessor} instance using the {@link getProcessor()}
     * method.
     */
    public function aggregateMultipleReports()
    {
        // empty
    }

    /**
     * Returns a {@link Piwik\ArchiveProcessor} instance that can be used to insert archive data for
     * the period, segment and site we are archiving data for.
     *
     * @return \Piwik\ArchiveProcessor
     * @api
     */
    protected function getProcessor()
    {
        return $this->processor;
    }

    /**
     * Returns a {@link Piwik\DataAccess\LogAggregator} instance that can be used to aggregate log table rows
     * for this period, segment and site.
     *
     * @return \Piwik\DataAccess\LogAggregator
     * @api
     */
    protected function getLogAggregator()
    {
        return $this->getProcessor()->getLogAggregator();
    }

    public function disable()
    {
        $this->enabled = false;
    }

    /**
     * Whether this Archiver should be used or not.
     *
     * @return bool
     */
    public function isEnabled()
    {
        return $this->enabled;
    }

    /**
     * By overwriting this method and returning true, a plugin archiver can force the archiving to run even when there
     * was no visit for the website/date/period/segment combination
     * (by default, archivers are skipped when there is no visit).
     *
     * @return bool
     */
    public static function shouldRunEvenWhenNoVisits()
    {
        return false;
    }

    /**
     * Returns a list of segments that should be pre-archived along with the segment currently being archived.
     * The segments in this list will be added to the current segment via an AND condition and archiving
     * for the current plugin will be launched. This process will not recurse further.
     *
     * If your plugin's API appends conditions to the requested segment when fetching data, you will want to
     * use this method to make sure those segments get pre-archived. Otherwise, if browser archiving is disabled,
     * the modified segments will appear to have no data.
     *
     * To archive another plugin, use an array instead of a string segment, for example:
     *
     * ```
     * ['plugin' => 'VisitsSummary', 'segment' => '...']
     * ```
     *
     * See the Goals and VisitFrequency plugins for examples.
     *
     * @return array
     * @api
     */
    public function getDependentSegmentsToArchive(): array
    {
        return [];
    }

    protected function isRequestedReport(string $reportName)
    {
        $requestedReport = $this->getProcessor()->getParams()->getArchiveOnlyReport();

        return empty($requestedReport) || $requestedReport == $reportName;
    }

    private function processDependentArchivesForPlugins()
    {
        if (!self::$ARCHIVE_DEPENDENT) {
            return;
        }

        $dependentSegments = $this->getDependentSegmentsToArchive();
        foreach ($dependentSegments as $dependentSegment) {
            $plugin = $this->getPluginName();
            $segment = $dependentSegment;

            if (is_array($dependentSegment)) {
                $plugin = $dependentSegment['plugin'] ?? $plugin;
                $segment = $dependentSegment['segment'];
            }

            $this->getProcessor()->processDependentArchive($plugin, $segment);
        }
    }

    private static function getDefaultConstructibleClasses(array $classes): array
    {
        return array_filter($classes, function ($className) {
            return (new \ReflectionClass($className))->getConstructor()->getNumberOfRequiredParameters() == 0;
        });
    }

    private static function getAllRecordBuilderClasses(): array
    {
        $transientCache = Cache::getTransientCache();
        $cacheKey = CacheId::siteAware('RecordBuilders.allRecordBuilders');

        $recordBuilderClasses = $transientCache->fetch($cacheKey);
        if ($recordBuilderClasses === false) {
            $recordBuilderClasses = Manager::getInstance()->findMultipleComponents('RecordBuilders', ArchiveProcessor\RecordBuilder::class);
            $recordBuilderClasses = self::getDefaultConstructibleClasses($recordBuilderClasses);

            $transientCache->save($cacheKey, $recordBuilderClasses);
        }
        return $recordBuilderClasses;
    }

    public static function doesPluginHaveRecordBuilders(string $pluginName): bool
    {
        $recordBuilders = self::getAllRecordBuilderClasses();
        foreach ($recordBuilders as $builder) {
            if ($pluginName === Piwik::getPluginNameOfMatomoClass($builder)) {
                return true;
            }
        }
        return false;
    }
}
