<?php

declare(strict_types=1);

namespace Chill\PersonBundle\Service\Import;

use Chill\PersonBundle\Entity\SocialWork\Evaluation;
use Chill\PersonBundle\Entity\SocialWork\Goal;
use Chill\PersonBundle\Entity\SocialWork\Result;
use Chill\PersonBundle\Entity\SocialWork\SocialAction;
use Chill\PersonBundle\Entity\SocialWork\SocialIssue;
use Chill\PersonBundle\Repository\SocialWork\EvaluationRepository;
use Chill\PersonBundle\Repository\SocialWork\GoalRepository;
use Chill\PersonBundle\Repository\SocialWork\ResultRepository;
use Chill\PersonBundle\Repository\SocialWork\SocialActionRepository;
use Chill\PersonBundle\Repository\SocialWork\SocialIssueRepository;
use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\Query\Expr\Comparison;
use Doctrine\Persistence\ObjectRepository;
use Exception;

final class SocialWorkMetadata implements SocialWorkMetadataInterface
{
    private SocialIssueRepository $socialIssueRepository;

    private SocialActionRepository $socialActionRepository;

    private GoalRepository $goalRepository;

    private ResultRepository $resultRepository;

    private EvaluationRepository $evaluationRepository;

    private EntityManagerInterface $entityManager;

    public function __construct(
        SocialIssueRepository $socialIssueRepository,
        SocialActionRepository $socialActionRepository,
        GoalRepository $goalRepository,
        ResultRepository $resultRepository,
        EvaluationRepository $evaluationRepository,
        EntityManagerInterface $entityManager
    ) {
        $this->socialIssueRepository = $socialIssueRepository;
        $this->socialActionRepository = $socialActionRepository;
        $this->goalRepository = $goalRepository;
        $this->resultRepository = $resultRepository;
        $this->evaluationRepository = $evaluationRepository;
        $this->entityManager = $entityManager;
    }

    public function import(iterable $dataset): bool
    {
        foreach ($dataset as $row) {
            $this->import1(
                array_map(
                    static fn (string $column): ?string => '' === $column ? null : $column,
                    array_map('trim', $row)
                )
            );
        }

        return true;
    }

    private function import1(array $row): void
    {
        // Structure:
        // Index 0: SocialIssue.parent
        // Index 1: SocialIssue
        // Index 2: SocialAction.parent
        // Index 3: SocialAction
        // Index 4: Goal
        // Index 5: Result
        // Index 6: Evaluation

        $socialIssue = $this->handleSocialIssue($row[0], $row[1]);

        $socialAction = $this->handleSocialAction($row[2], $row[3], $socialIssue);

        $goal = $this->handleGoal($row[4], $socialAction);

        $result = $this->handleResult($row[5], $socialAction, $goal);

        $eval = $this->handleEvaluation($row[6], $socialAction);

        $this->entityManager->flush();
    }

    private function handleSocialIssue(?string $socialIssueTitle = null, ?string $socialIssueChildrenTitle = null): SocialIssue
    {
        if (null !== $socialIssueChildrenTitle) {
            /** @var SocialIssue $socialIssueChildren */
            $socialIssueChildren = $this->getOrCreateEntity($this->socialIssueRepository, 'title', ['fr' => $socialIssueChildrenTitle]);
            $socialIssueChildren->setTitle(['fr' => $socialIssueChildrenTitle]);

            $this->entityManager->persist($socialIssueChildren);
        }

        /** @var SocialIssue $socialIssue */
        $socialIssue = $this->getOrCreateEntity($this->socialIssueRepository, 'title', ['fr' => $socialIssueTitle]);
        $socialIssue->setTitle(['fr' => $socialIssueTitle]);

        if (null !== $socialIssueChildrenTitle) {
            $socialIssue->addChild($socialIssueChildren);
        }

        $this->entityManager->persist($socialIssue);

        return null === $socialIssueChildrenTitle ? $socialIssue : $socialIssueChildren;
    }

    private function handleSocialAction(?string $socialActionTitle, ?string $socialActionChildrenTitle, SocialIssue $socialIssue): SocialAction
    {
        if (null !== $socialActionChildrenTitle) {
            /** @var SocialAction $socialActionChildren */
            $socialActionChildren = $this->getOrCreateEntity($this->socialActionRepository, 'title', ['fr' => $socialActionChildrenTitle]);
            $socialActionChildren->setTitle(['fr' => $socialActionChildrenTitle]);

            $this->entityManager->persist($socialActionChildren);
        }

        /** @var SocialIssue $socialIssue */
        $socialAction = $this->getOrCreateEntity($this->socialActionRepository, 'title', ['fr' => $socialActionTitle]);
        $socialAction->setTitle(['fr' => $socialActionTitle]);

        if (null !== $socialActionChildrenTitle) {
            $socialActionChildren->setIssue($socialIssue);
            $this->entityManager->persist($socialActionChildren);

            $socialAction->addChild($socialActionChildren);
        } else {
            $socialAction->setIssue($socialIssue);
        }

        $this->entityManager->persist($socialAction);

        return null === $socialActionChildrenTitle ? $socialAction : $socialActionChildren;
    }

    private function handleGoal(?string $goalTitle = null, ?SocialAction $socialAction = null): ?Goal
    {
        if (null === $goalTitle) {
            return null;
        }

        /** @var Goal $goal */
        $goal = $this->getOrCreateEntity($this->goalRepository, 'title', ['fr' => $goalTitle]);
        $goal->setTitle(['fr' => $goalTitle]);

        if (null !== $socialAction) {
            $socialAction->addGoal($goal);
            $goal->addSocialAction($socialAction);

            $this->entityManager->persist($socialAction);
        }

        $this->entityManager->persist($goal);

        return $goal;
    }

    private function handleResult(?string $resultTitle = null, ?SocialAction $socialAction = null, ?Goal $goal = null): ?Result
    {
        if (null === $resultTitle) {
            return null;
        }

        /** @var Result $result */
        $result = $this->getOrCreateEntity($this->resultRepository, 'title', ['fr' => $resultTitle]);
        $result->setTitle(['fr' => $resultTitle]);

        if (null !== $goal) {
            $result->addGoal($goal);
            $goal->addResult($result);

            $this->entityManager->persist($goal);
        } else {
            $result->addSocialAction($socialAction);
        }

        $result->addSocialAction($socialAction);
        $socialAction->addResult($result);

        $this->entityManager->persist($result);
        $this->entityManager->persist($socialAction);

        return $result;
    }

    private function handleEvaluation(?string $evaluationTitle, SocialAction $socialAction): ?Evaluation
    {
        if (null === $evaluationTitle) {
            return null;
        }

        /** @var Evaluation $eval */
        $eval = $this->getOrCreateEntity($this->evaluationRepository, 'title', ['fr' => $evaluationTitle]);
        $eval->setTitle(['fr' => $evaluationTitle]);
        $eval->setSocialAction($socialAction);

        $this->entityManager->persist($eval);

        return $eval;
    }

    private function findByJson(ObjectRepository $repository, string $field, array $jsonCriterias): array
    {
        $qb = $this
            ->entityManager
            ->createQueryBuilder()
            ->select('s')
            ->from($repository->getClassName(), 's');

        $expr = $qb->expr();

        $temporaryJsonCriterias = $jsonParameters = [];

        foreach ($jsonCriterias as $key => $value) {
            $temporaryJsonCriterias[] = [$field, $key, $value, sprintf(':placeholder_%s_%s', $field, $key)];
        }

        $jsonParameters = array_reduce(
            $temporaryJsonCriterias,
            static function (array $carry, array $row): array
            {
                [,, $value, $placeholder] = $row;

                return array_merge(
                    $carry,
                    [
                        $placeholder => sprintf('"%s"', $value),
                    ]
                );
            },
            []
        );

        $jsonPredicates = array_map(
            static function (array $row) use ($expr): Comparison
            {
                [$field, $key,, $placeholder] = $row;

                $left = sprintf(
                    "GET_JSON_FIELD_BY_KEY(s.%s, '%s')",
                    $field,
                    $key
                );

                return $expr
                    ->eq(
                        $left,
                        $placeholder
                    );
            },
            $temporaryJsonCriterias
        );

        $query = $qb
            ->select('s')
            ->where(...$jsonPredicates)
            ->setParameters($jsonParameters)
            ->getQuery();

        return $query->getResult();
    }

    private function getOrCreateEntity(ObjectRepository $repository, string $field, array $jsonCriterias = [])
    {
        $results = $this
            ->findByJson(
                $repository,
                $field,
                $jsonCriterias
            );

        switch (true) {
            case count($results) === 0:
                $entity = $repository->getClassName();
                $entity = new $entity();
                break;
            case count($results) === 1;
                $entity = current($results);
                break;
            case count($results) > 1;
                throw new Exception(
                    sprintf(
                        'More than one entity(%s) found.',
                        $repository->getClassName()
                    )
                );
        }

        return $entity;
    }


}