<?php

namespace App\Entity;

use ApiPlatform\Doctrine\Orm\Filter\ExistsFilter;
use ApiPlatform\Doctrine\Orm\Filter\SearchFilter;
use ApiPlatform\Metadata\ApiFilter;
use ApiPlatform\Metadata\ApiResource;
use ApiPlatform\Metadata\Delete;
use ApiPlatform\Metadata\Get;
use ApiPlatform\Metadata\GetCollection;
use ApiPlatform\Metadata\Patch;
use ApiPlatform\Metadata\Post;
use App\State\ForumPositionProcessor;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
//use Symfony\Component\Serializer\Annotation\Groups;
use Symfony\Component\Serializer\Attribute\Groups;
use Symfony\Component\Validator\Constraints as Assert;

#[ORM\Entity]
#[ORM\HasLifecycleCallbacks]
#[ORM\Table(indexes: [
    new ORM\Index(name: 'idx_forum_parent_position', columns: ['parent_id', 'position']),
    new ORM\Index(name: 'idx_forum_type', columns: ['type']),
])]
#[ApiFilter(SearchFilter::class, properties: ['parent' => 'exact', 'type' => 'exact'])]
#[ApiFilter(ExistsFilter::class, properties: ['parent'])]
#[ApiResource(
    operations            : [
        new Get(),
        new GetCollection(),
        new Post(security: "is_granted('ROLE_ADMIN')", processor: ForumPositionProcessor::class),
        new Patch(security: "is_granted('ROLE_ADMIN')", processor: ForumPositionProcessor::class),
        new Delete(security: "is_granted('ROLE_ADMIN')")
    ],
    normalizationContext  : ['groups' => ['forum:read']],
    denormalizationContext: ['groups' => ['forum:write']],
    order                 : ['position' => 'ASC']
)]
class Forum
{
    public const TYPE_CATEGORY = 'category';
    public const TYPE_FORUM = 'forum';

    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column]
    #[Groups(['forum:read', 'thread:read'])]
    private ?int $id = null;

    #[ORM\Column(length: 100)]
    #[Assert\NotBlank]
    #[Groups(['forum:read', 'forum:write', 'thread:read'])]
    private ?string $name = null;

    #[ORM\Column(type: 'text', nullable: true)]
    #[Groups(['forum:read', 'forum:write'])]
    private ?string $description = null;

    #[ORM\Column(length: 20)]
    #[Assert\Choice(choices: [self::TYPE_CATEGORY, self::TYPE_FORUM])]
    #[Groups(['forum:read', 'forum:write'])]
    private string $type = self::TYPE_CATEGORY;

    #[ORM\ManyToOne(targetEntity: self::class, inversedBy: 'children')]
    #[Assert\Expression(
        "this.getParent() === null or this.getParent().isCategory()",
        message: "Parent must be a category."
    )]
    #[Groups(['forum:read', 'forum:write'])]
    private ?self $parent = null;

    #[ORM\OneToMany(mappedBy: 'parent', targetEntity: self::class)]
    #[Groups(['forum:read'])]
    private Collection $children;

    #[ORM\OneToMany(mappedBy: 'forum', targetEntity: Thread::class)]
    #[Groups(['forum:read'])]
    private Collection $threads;

    #[ORM\Column]
    #[Groups(['forum:read'])]
    private int $position = 0;

    #[ORM\Column]
    #[Groups(['forum:read'])]
    private ?\DateTimeImmutable $createdAt = null;

    #[ORM\Column]
    #[Groups(['forum:read'])]
    private ?\DateTimeImmutable $updatedAt = null;

    public function __construct()
    {
        $this->children = new ArrayCollection();
        $this->threads = new ArrayCollection();
    }

    #[ORM\PrePersist]
    public function onCreate(): void
    {
        $now = new \DateTimeImmutable();
        $this->createdAt = $now;
        $this->updatedAt = $now;
    }

    #[ORM\PreUpdate]
    public function onUpdate(): void
    {
        $this->updatedAt = new \DateTimeImmutable();
    }

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

    public function getName(): ?string
    {
        return $this->name;
    }

    public function setName(string $name): self
    {
        $this->name = $name;

        return $this;
    }

    public function getDescription(): ?string
    {
        return $this->description;
    }

    public function setDescription(?string $description): self
    {
        $this->description = $description;

        return $this;
    }

    public function getType(): string
    {
        return $this->type;
    }

    public function setType(string $type): self
    {
        $this->type = $type;

        return $this;
    }

    public function getParent(): ?self
    {
        return $this->parent;
    }

    public function setParent(?self $parent): self
    {
        $this->parent = $parent;

        return $this;
    }

    /**
     * @return Collection<int, Forum>
     */
    public function getChildren(): Collection
    {
        return $this->children;
    }

    public function getPosition(): int
    {
        return $this->position;
    }

    public function setPosition(int $position): self
    {
        $this->position = $position;

        return $this;
    }

    /**
     * @return Collection<int, Thread>
     */
    public function getThreads(): Collection
    {
        return $this->threads;
    }

    public function isCategory(): bool
    {
        return $this->type === self::TYPE_CATEGORY;
    }

    public function isForum(): bool
    {
        return $this->type === self::TYPE_FORUM;
    }
}