<?php

declare(strict_types=1);

/*
 * Chill is a software for social workers
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace Chill\DocStoreBundle\Entity;

use Chill\DocStoreBundle\Validator\Constraints\AsyncFileExists;
use ChampsLibres\WopiLib\Contract\Entity\Document;
use Chill\DocGeneratorBundle\Entity\DocGeneratorTemplate;
use Chill\MainBundle\Doctrine\Model\TrackCreationInterface;
use Chill\MainBundle\Doctrine\Model\TrackCreationTrait;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use Ramsey\Uuid\Uuid;
use Ramsey\Uuid\UuidInterface;
use Random\RandomException;
use Symfony\Component\Serializer\Annotation as Serializer;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * Represent a document stored in an object store.
 *
 * StoredObjects 's content should be read and written using the @see{StoredObjectManagerInterface}.
 *
 * The property `$deleteAt` allow a deletion of the document after the given date. But this property should
 * be set before the document is actually written by the StoredObjectManager.
 *
 * Each version is stored within a @see{StoredObjectVersion}, associated with this current's object. The creation
 * of each new version should be done using the method @see{self::registerVersion}.
 */
#[ORM\Entity]
#[ORM\Table('stored_object', schema: 'chill_doc')]
class StoredObject implements Document, TrackCreationInterface
{
    use TrackCreationTrait;
    final public const STATUS_EMPTY = 'empty';
    final public const STATUS_READY = 'ready';
    final public const STATUS_PENDING = 'pending';
    final public const STATUS_FAILURE = 'failure';

    #[Serializer\Groups(['write'])]
    #[ORM\Column(type: \Doctrine\DBAL\Types\Types::JSON, name: 'datas')]
    private array $datas = [];

    /**
     * the prefix of each version.
     */
    #[ORM\Column(type: \Doctrine\DBAL\Types\Types::TEXT, nullable: false, options: ['default' => ''])]
    private string $prefix = '';

    #[Serializer\Groups(['write'])]
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column(type: \Doctrine\DBAL\Types\Types::INTEGER)]
    private ?int $id = null;

    #[Serializer\Groups(['write'])]
    #[ORM\Column(name: 'title', type: \Doctrine\DBAL\Types\Types::TEXT, options: ['default' => ''])]
    private string $title = '';

    #[Serializer\Groups(['write'])]
    #[ORM\Column(type: 'uuid', unique: true)]
    private UuidInterface $uuid;

    #[ORM\ManyToOne(targetEntity: DocGeneratorTemplate::class)]
    private ?DocGeneratorTemplate $template = null;

    /**
     * Store the number of times a generation has been tryied for this StoredObject.
     *
     * This is a workaround, as generation consume lot of memory, and out-of-memory errors
     * are not handled by messenger.
     */
    #[ORM\Column(type: \Doctrine\DBAL\Types\Types::INTEGER, options: ['default' => 0])]
    private int $generationTrialsCounter = 0;

    #[ORM\Column(type: \Doctrine\DBAL\Types\Types::DATETIME_IMMUTABLE, nullable: true, options: ['default' => null])]
    private ?\DateTimeImmutable $deleteAt = null;

    #[ORM\Column(type: \Doctrine\DBAL\Types\Types::TEXT, nullable: false, options: ['default' => ''])]
    private string $generationErrors = '';

    /**
     * @var Collection<int, StoredObjectVersion>
     */
    #[ORM\OneToMany(mappedBy: 'storedObject', targetEntity: StoredObjectVersion::class, cascade: ['persist'], orphanRemoval: true)]
    private Collection $versions;

    /**
     * @param StoredObject::STATUS_* $status
     */
    public function __construct(
        #[ORM\Column(type: \Doctrine\DBAL\Types\Types::TEXT, options: ['default' => 'ready'])]
        private string $status = 'empty'
    ) {
        $this->uuid = Uuid::uuid4();
        $this->versions = new ArrayCollection();
        $this->prefix = self::generatePrefix();
    }

    public function addGenerationTrial(): self
    {
        ++$this->generationTrialsCounter;

        return $this;
    }

    /**
     * @deprecated
     */
    #[Serializer\Groups(['write'])]
    public function getCreationDate(): \DateTime
    {
        if (null === $this->createdAt) {
            // this scenario will quite never happens
            return new \DateTime('now');
        }

        return \DateTime::createFromImmutable($this->createdAt);
    }

    #[AsyncFileExists(message: 'The file is not stored properly')]
    #[Assert\NotNull(message: 'The store object version must be present')]
    public function getCurrentVersion(): ?StoredObjectVersion
    {
        $maxVersion = null;

        foreach ($this->versions as $v) {
            if ($v->getVersion() > ($maxVersion?->getVersion() ?? -1)) {
                $maxVersion = $v;
            }
        }

        return $maxVersion;
    }

    public function getDatas(): array
    {
        return $this->datas;
    }

    public function getPrefix(): string
    {
        return $this->prefix;
    }

    public function getFilename(): string
    {
        return $this->getCurrentVersion()?->getFilename() ?? '';
    }

    public function getGenerationTrialsCounter(): int
    {
        return $this->generationTrialsCounter;
    }

    public function getId(): ?int
    {
        return $this->id;
    }

    /**
     * @return list<int>
     */
    public function getIv(): array
    {
        return $this->getCurrentVersion()?->getIv() ?? [];
    }

    public function getKeyInfos(): array
    {
        return $this->getCurrentVersion()?->getKeyInfos() ?? [];
    }

    /**
     * @deprecated use method "getFilename()"
     */
    public function getObjectName()
    {
        return $this->getFilename();
    }

    /**
     * @return StoredObject::STATUS_*
     */
    public function getStatus(): string
    {
        return $this->status;
    }

    public function getTitle(): string
    {
        return $this->title;
    }

    public function getType(): string
    {
        return $this->getCurrentVersion()?->getType() ?? '';
    }

    public function getUuid(): UuidInterface
    {
        return $this->uuid;
    }

    public function getWopiDocId(): string
    {
        return (string) $this->uuid;
    }

    /**
     * @deprecated
     */
    #[Serializer\Groups(['write'])]
    public function setCreationDate(\DateTime $creationDate): self
    {
        $this->createdAt = \DateTimeImmutable::createFromMutable($creationDate);

        return $this;
    }

    public function setDatas(?array $datas): self
    {
        $this->datas = (array) $datas;

        return $this;
    }

    /**
     * @param StoredObject::STATUS_* $status
     */
    public function setStatus(string $status): self
    {
        $this->status = $status;

        return $this;
    }

    public function setTitle(?string $title): self
    {
        $this->title = (string) $title;

        return $this;
    }

    public function getTemplate(): ?DocGeneratorTemplate
    {
        return $this->template;
    }

    public function getVersions(): Collection
    {
        return $this->versions;
    }

    public function hasTemplate(): bool
    {
        return null !== $this->template;
    }

    public function setTemplate(?DocGeneratorTemplate $template): StoredObject
    {
        $this->template = $template;

        return $this;
    }

    public function isPending(): bool
    {
        return self::STATUS_PENDING === $this->getStatus();
    }

    public function isFailure(): bool
    {
        return self::STATUS_FAILURE === $this->getStatus();
    }

    public function getDeleteAt(): ?\DateTimeImmutable
    {
        return $this->deleteAt;
    }

    public function setDeleteAt(?\DateTimeImmutable $deleteAt): StoredObject
    {
        $this->deleteAt = $deleteAt;

        return $this;
    }

    public function getGenerationErrors(): string
    {
        return $this->generationErrors;
    }

    /**
     * Adds generation errors to the stored object.
     *
     * The existing generation errors are not removed
     *
     * @param string $generationErrors the generation errors to be added
     *
     * @return StoredObject the modified StoredObject instance
     */
    public function addGenerationErrors(string $generationErrors): StoredObject
    {
        $this->generationErrors = $this->generationErrors.$generationErrors."\n";

        return $this;
    }

    public function registerVersion(
        array $iv = [],
        array $keyInfos = [],
        string $type = '',
        ?string $filename = null,
    ): StoredObjectVersion {
        $version = new StoredObjectVersion(
            $this,
            null === $this->getCurrentVersion() ? 0 : $this->getCurrentVersion()->getVersion() + 1,
            $iv,
            $keyInfos,
            $type,
            $filename
        );

        $this->versions->add($version);

        if ('empty' === $this->status) {
            $this->status = self::STATUS_READY;
        }

        return $version;
    }

    public function removeVersion(StoredObjectVersion $storedObjectVersion): void
    {
        if (!$this->versions->contains($storedObjectVersion)) {
            throw new \UnexpectedValueException('This stored object does not contains this version');
        }
        $this->versions->removeElement($storedObjectVersion);
        $storedObjectVersion->resetStoredObject();
    }

    /**
     * @deprecated
     */
    public function saveHistory(): void {}

    public static function generatePrefix(): string
    {
        try {
            return base_convert(bin2hex(random_bytes(32)), 16, 36);
        } catch (RandomException) {
            return uniqid(more_entropy: true);
        }
    }

    /**
     * Checks if a stored object can be deleted.
     *
     * Currently, return true if the deletedAt date is below the current date, and the object
     * does not contains any version (which must be removed first).
     *
     * @param \DateTimeImmutable $now          the current date and time
     * @param StoredObject       $storedObject the stored object to check
     *
     * @return bool returns true if the stored object can be deleted, false otherwise
     */
    public static function canBeDeleted(\DateTimeImmutable $now, StoredObject $storedObject): bool
    {
        return $storedObject->getDeleteAt() < $now && $storedObject->getVersions()->isEmpty();
    }
}