<?php

namespace Doctrine\Bundle\DoctrineBundle\DataCollector;

use Doctrine\DBAL\Types\Type;
use Doctrine\ORM\Cache\CacheConfiguration;
use Doctrine\ORM\Cache\Logging\CacheLoggerChain;
use Doctrine\ORM\Cache\Logging\StatisticsCacheLogger;
use Doctrine\ORM\Configuration;
use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\Mapping\ClassMetadataInfo;
use Doctrine\ORM\Tools\SchemaValidator;
use Doctrine\Persistence\ManagerRegistry;
use Doctrine\Persistence\Mapping\AbstractClassMetadataFactory;
use Symfony\Bridge\Doctrine\DataCollector\DoctrineDataCollector as BaseCollector;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Throwable;

use function array_map;
use function array_sum;
use function assert;
use function count;
use function usort;

/**
 * @psalm-type QueryType = array{
 *    executionMS: int,
 *    explainable: bool,
 *    sql: string,
 *    params: ?array<array-key, mixed>,
 *    runnable: bool,
 *    types: ?array<array-key, Type|int|string|null>,
 * }
 * @psalm-type DataType = array{
 *    caches: array{
 *       enabled: bool,
 *       counts: array<"puts"|"hits"|"misses", int>,
 *       log_enabled: bool,
 *       regions: array<"puts"|"hits"|"misses", array<string, int>>,
 *    },
 *    connections: list<string>,
 *    entities: array<string, array<class-string, class-string>>,
 *    errors: array<string, array<class-string, list<string>>>,
 *    managers: list<string>,
 *    queries: array<string, list<QueryType>>,
 * }
 * @psalm-property DataType $data
 */
class DoctrineDataCollector extends BaseCollector
{
    /** @var ManagerRegistry */
    private $registry;

    /** @var int|null */
    private $invalidEntityCount;

    /**
     * @var mixed[][]
     * @psalm-var ?array<string, list<QueryType&array{count: int, index: int, executionPercent: float}>>
     */
    private $groupedQueries;

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

    public function __construct(ManagerRegistry $registry, bool $shouldValidateSchema = true)
    {
        $this->registry             = $registry;
        $this->shouldValidateSchema = $shouldValidateSchema;

        parent::__construct($registry);
    }

    /**
     * {@inheritdoc}
     */
    public function collect(Request $request, Response $response, ?Throwable $exception = null)
    {
        parent::collect($request, $response, $exception);

        $errors   = [];
        $entities = [];
        $caches   = [
            'enabled' => false,
            'log_enabled' => false,
            'counts' => [
                'puts' => 0,
                'hits' => 0,
                'misses' => 0,
            ],
            'regions' => [
                'puts' => [],
                'hits' => [],
                'misses' => [],
            ],
        ];

        foreach ($this->registry->getManagers() as $name => $em) {
            assert($em instanceof EntityManagerInterface);
            if ($this->shouldValidateSchema) {
                $entities[$name] = [];

                $factory   = $em->getMetadataFactory();
                $validator = new SchemaValidator($em);

                assert($factory instanceof AbstractClassMetadataFactory);

                foreach ($factory->getLoadedMetadata() as $class) {
                    assert($class instanceof ClassMetadataInfo);
                    if (isset($entities[$name][$class->getName()])) {
                        continue;
                    }

                    $classErrors                        = $validator->validateClass($class);
                    $entities[$name][$class->getName()] = $class->getName();

                    if (empty($classErrors)) {
                        continue;
                    }

                    $errors[$name][$class->getName()] = $classErrors;
                }
            }

            $emConfig = $em->getConfiguration();
            assert($emConfig instanceof Configuration);
            $slcEnabled = $emConfig->isSecondLevelCacheEnabled();

            if (! $slcEnabled) {
                continue;
            }

            $caches['enabled'] = true;

            $cacheConfiguration = $emConfig->getSecondLevelCacheConfiguration();
            assert($cacheConfiguration instanceof CacheConfiguration);
            $cacheLoggerChain = $cacheConfiguration->getCacheLogger();
            assert($cacheLoggerChain instanceof CacheLoggerChain || $cacheLoggerChain === null);

            if (! $cacheLoggerChain || ! $cacheLoggerChain->getLogger('statistics')) {
                continue;
            }

            $cacheLoggerStats = $cacheLoggerChain->getLogger('statistics');
            assert($cacheLoggerStats instanceof StatisticsCacheLogger);
            $caches['log_enabled'] = true;

            $caches['counts']['puts']   += $cacheLoggerStats->getPutCount();
            $caches['counts']['hits']   += $cacheLoggerStats->getHitCount();
            $caches['counts']['misses'] += $cacheLoggerStats->getMissCount();

            foreach ($cacheLoggerStats->getRegionsPut() as $key => $value) {
                if (! isset($caches['regions']['puts'][$key])) {
                    $caches['regions']['puts'][$key] = 0;
                }

                $caches['regions']['puts'][$key] += $value;
            }

            foreach ($cacheLoggerStats->getRegionsHit() as $key => $value) {
                if (! isset($caches['regions']['hits'][$key])) {
                    $caches['regions']['hits'][$key] = 0;
                }

                $caches['regions']['hits'][$key] += $value;
            }

            foreach ($cacheLoggerStats->getRegionsMiss() as $key => $value) {
                if (! isset($caches['regions']['misses'][$key])) {
                    $caches['regions']['misses'][$key] = 0;
                }

                $caches['regions']['misses'][$key] += $value;
            }
        }

        $this->data['entities'] = $entities;
        $this->data['errors']   = $errors;
        $this->data['caches']   = $caches;
        $this->groupedQueries   = null;
    }

    /** @return array<string, array<string, string>> */
    public function getEntities()
    {
        return $this->data['entities'];
    }

    /** @return array<string, array<string, list<string>>> */
    public function getMappingErrors()
    {
        return $this->data['errors'];
    }

    /** @return int */
    public function getCacheHitsCount()
    {
        return $this->data['caches']['counts']['hits'];
    }

    /** @return int */
    public function getCachePutsCount()
    {
        return $this->data['caches']['counts']['puts'];
    }

    /** @return int */
    public function getCacheMissesCount()
    {
        return $this->data['caches']['counts']['misses'];
    }

    /** @return bool */
    public function getCacheEnabled()
    {
        return $this->data['caches']['enabled'];
    }

    /**
     * @return array<string, array<string, int>>
     * @psalm-return array<"puts"|"hits"|"misses", array<string, int>>
     */
    public function getCacheRegions()
    {
        return $this->data['caches']['regions'];
    }

    /** @return array<string, int> */
    public function getCacheCounts()
    {
        return $this->data['caches']['counts'];
    }

    /** @return int */
    public function getInvalidEntityCount()
    {
        if ($this->invalidEntityCount === null) {
            $this->invalidEntityCount = array_sum(array_map('count', $this->data['errors']));
        }

        return $this->invalidEntityCount;
    }

    /**
     * @return string[][]
     * @psalm-return array<string, list<QueryType&array{count: int, index: int, executionPercent: float}>>
     */
    public function getGroupedQueries()
    {
        if ($this->groupedQueries !== null) {
            return $this->groupedQueries;
        }

        $this->groupedQueries = [];
        $totalExecutionMS     = 0;
        foreach ($this->data['queries'] as $connection => $queries) {
            $connectionGroupedQueries = [];
            foreach ($queries as $i => $query) {
                $key = $query['sql'];
                if (! isset($connectionGroupedQueries[$key])) {
                    $connectionGroupedQueries[$key]                = $query;
                    $connectionGroupedQueries[$key]['executionMS'] = 0;
                    $connectionGroupedQueries[$key]['count']       = 0;
                    $connectionGroupedQueries[$key]['index']       = $i; // "Explain query" relies on query index in 'queries'.
                }

                $connectionGroupedQueries[$key]['executionMS'] += $query['executionMS'];
                $connectionGroupedQueries[$key]['count']++;
                $totalExecutionMS += $query['executionMS'];
            }

            usort($connectionGroupedQueries, static function ($a, $b) {
                if ($a['executionMS'] === $b['executionMS']) {
                    return 0;
                }

                return $a['executionMS'] < $b['executionMS'] ? 1 : -1;
            });
            $this->groupedQueries[$connection] = $connectionGroupedQueries;
        }

        foreach ($this->groupedQueries as $connection => $queries) {
            foreach ($queries as $i => $query) {
                $this->groupedQueries[$connection][$i]['executionPercent'] =
                    $this->executionTimePercentage($query['executionMS'], $totalExecutionMS);
            }
        }

        return $this->groupedQueries;
    }

    private function executionTimePercentage(int $executionTimeMS, int $totalExecutionTimeMS): float
    {
        if (! $totalExecutionTimeMS) {
            return 0;
        }

        return $executionTimeMS / $totalExecutionTimeMS * 100;
    }

    /** @return int */
    public function getGroupedQueryCount()
    {
        $count = 0;
        foreach ($this->getGroupedQueries() as $connectionGroupedQueries) {
            $count += count($connectionGroupedQueries);
        }

        return $count;
    }
}
