<?php

	namespace vlw\WP\Posts;

	use Exception;
	use DateTimeImmutable;
	use vlw\Scaffold\Database\Model;

	use vlw\WP\Database;
	use vlw\WP\Tables\Posts;
	use vlw\WP\Posts\PostMeta;
	use vlw\WP\Posts\Taxonomy\Term;
	use vlw\WP\Posts\Type\Attachment;
	use function vlw\WP\Support\slugify;

	require_once "Taxonomy/Term.php";
	require_once dirname(__DIR__, 1) . "/Tables/Posts.php";
	require_once dirname(__DIR__, 1) . "/Support/Slugify.php";

	class Post extends Model {
		/**
		 * Get a Post by post_name
		 *
		 * @param string $name
		 * @return static|null
		 */
		public static function from_name(string $name, bool $slugify = true): ?static {
			$query = Database::current()
				->from(Database::get_table(Posts::TABLE_NAME))
				->where([Posts::POST_NAME->value => $slugify ? slugify($name) : $name])
				->limit(1)
				->select(Posts::ID->value);

			return $query->num_rows === 1 ? new static($query->fetch_assoc()[Posts::ID->value]) : null;
		}

		/**
		 * Create a new post
		 *
		 * @param string $title Post title
		 * @param string $type Post type
		 * @return static
		 */
		public static function new(string $title): static {
			// Return existing post if exists
			if (self::from_name($title)) {
				return self::from_name($title);
			}

			$values = [
				Posts::ID->value                    => null,
				Posts::POST_AUTHOR->value           => 0,
				Posts::POST_DATE->value             => date(static::DATETIME_FORMAT),
				Posts::POST_DATE_GMT->value         => date(static::DATETIME_FORMAT),
				Posts::POST_CONTENT->value          => "",
				Posts::POST_TITLE->value            => $title,
				Posts::POST_EXCERPT->value          => "",
				Posts::POST_STATUS->value           => "private",
				Posts::COMMENT_STATUS->value        => "closed",
				Posts::PING_STATUS->value           => "closed",
				Posts::POST_PASSWORD->value         => "",
				Posts::POST_NAME->value             => slugify($title),
				Posts::TO_PING->value               => "",
				Posts::PINGED->value                => "",
				Posts::POST_MODIFIED->value         => date(static::DATETIME_FORMAT),
				Posts::POST_MODIFIED_GMT->value     => date(static::DATETIME_FORMAT),
				Posts::POST_CONTENT_FILTERED->value => "",
				Posts::POST_PARENT->value           => 0,
				Posts::GUID->value                  => "",
				Posts::MENU_ORDER->value            => 0,
				Posts::POST_TYPE->value             => "post",
				Posts::POST_MIME_TYPE->value        => "",
				Posts::COMMENT_COUNT->value         => 0
			];

			if (!parent::create(Database::get_table(Posts::TABLE_NAME), $values)) {
				throw new Exception("Failed to create database entity");
			}

			return self::from_name($title);
		}

		public function __construct(public readonly int $id) {
			parent::__construct(
				Database::get_table(Posts::TABLE_NAME),
				Posts::values(),
				[Posts::ID->value => (int) $id]
			);
		}

		/**
		 * Get post meta fields for this Post. An array of all post meta is returned if no $key is provided
		 *
		 * @param string|null $key Return the value of this post meta key. Null for all post meta fields
		 * @return string|array|null Returns a string or null if a single key is selected. Array if all post meta fields are returned
		 */
		public function meta(?string $key = null): string|array|null {
			return $key ? PostMeta::get_post_meta($this, $key) : PostMeta::get_all_post_meta($this);
		}

		/**
		 * Returns an array of all Terms assigned to this Post
		 *
		 * @return array
		 */
		public function terms(): array {
			return Term::from_post($this);
		}

		/**
		 * Add a Term to this Post
		 *
		 * @param Term $term
		 * @return void
		 */
		public function add_term(Term $term): void {
			$term->add_to_post($this);
		}

		/**
		 * Remove a Term from this Post
		 *
		 * @param Term $term
		 * @return void
		 */
		public function remove_term(Term $term): void {
			$term->remove_from_post($this);
		}

		/**
		 * Get, set, or unset featured media for this Post
		 *
		 * @param Attachment|false|null $attachment Pass Attachment to set featured media, false to unset, and null (or nothing) to get featured media
		 * @return Attachment|null Returns an Attachment if featured media is set. Null if no featured media is set
		 */
		public function featured_media(Attachment|false|null $featured_media = null): ?Attachment {
			// Remove featured media from this Post
			if ($featured_media === false) {
				Attachment::remove_post_featured_media($this);
				return null;
			}

			// Set Attachment as the featured media for this Post
			if ($featured_media instanceof Attachment) {
				$featured_media->set_post_featured($this);

				return $featured_media;
			}

			return Attachment::from_post_featured($this);
		}

		public int $post_author {
			get                    => $this->get(Posts::POST_AUTHOR->value);
			set (int $post_author) => $this->set(Posts::POST_AUTHOR->value, $post_author);
		}

		public DateTimeImmutable $post_date {
			get                                => new DateTimeImmutable($this->get(Posts::POST_DATE->value));
			set (DateTimeImmutable $post_date) => $this->set(Posts::POST_DATE->value, $post_date->format(static::DATETIME_FORMAT));
		}

		public DateTimeImmutable $post_date_gmt {
			get                                    => new DateTimeImmutable($this->get(Posts::POST_DATE_GMT->value));
			set (DateTimeImmutable $post_date_gmt) => $this->set(Posts::POST_DATE_GMT->value, $post_date_gmt->format(static::DATETIME_FORMAT));
		}

		public string $post_content {
			get                        => $this->get(Posts::POST_CONTENT->value);
			set (string $post_content) => $this->set(Posts::POST_CONTENT->value, $post_content);
		}

		public string $post_title {
			get                      => $this->get(Posts::POST_TITLE->value);
			set (string $post_title) => $this->set(Posts::POST_TITLE->value, $post_title);
		}

		public string $post_excerpt {
			get                        => $this->get(Posts::POST_EXCERPT->value);
			set (string $post_excerpt) => $this->set(Posts::POST_EXCERPT->value, $post_excerpt);
		}

		public string $post_status {
			get                       => $this->get(Posts::POST_STATUS->value);
			set (string $post_status) => $this->set(Posts::POST_STATUS->value, $post_status);
		}

		public string $comment_status {
			get                          => $this->get(Posts::COMMENT_STATUS->value);
			set (string $comment_status) => $this->set(Posts::COMMENT_STATUS->value, $comment_status);
		}

		public string $ping_status {
			get                       => $this->get(Posts::PING_STATUS->value);
			set (string $ping_status) => $this->set(Posts::PING_STATUS->value, $ping_status);
		}

		public string $post_password {
			get                         => $this->get(Posts::POST_PASSWORD->value);
			set (string $post_password) => $this->set(Posts::POST_PASSWORD->value, $post_password);
		}

		public string $post_name {
			get                     => $this->get(Posts::POST_NAME->value);
			set (string $post_name) => $this->set(Posts::POST_NAME->value, $post_name);
		}

		public string $to_ping {
			get                   => $this->get(Posts::TO_PING->value);
			set (string $to_ping) => $this->set(Posts::TO_PING->value, $to_ping);
		}

		public string $pinged {
			get                  => $this->get(Posts::PINGED->value);
			set (string $pinged) => $this->set(Posts::PINGED->value, $pinged);
		}

		public DateTimeImmutable $post_modified {
			get                                    => new DateTimeImmutable($this->get(Posts::POST_MODIFIED->value));
			set (DateTimeImmutable $post_modified) => $this->set(Posts::POST_MODIFIED->value, $post_modified->format(static::DATETIME_FORMAT));
		}

		public DateTimeImmutable $post_modified_gmt {
			get                                        => new DateTimeImmutable($this->get(Posts::POST_MODIFIED_GMT->value));
			set (DateTimeImmutable $post_modified_gmt) => $this->set(Posts::POST_MODIFIED_GMT->value, $post_modified_gmt->format(static::DATETIME_FORMAT));
		}

		public Post|false|null $post_parent {
			get                                => $this->get(Posts::POST_PARENT->value) !== 0 ? new self($this->get(Posts::POST_PARENT->value)) : null;
			set (Post|false|null $post_parent) => $this->set(Posts::POST_PARENT->value, $post_parent ? $post_parent->id : 0);
		}

		public string $guid {
			get                => $this->get(Posts::GUID->value);
			set (string $guid) => $this->set(Posts::GUID->value, $guid);
		}

		public int $menu_order {
			get                   => $this->get(Posts::MENU_ORDER->value);
			set (int $menu_order) => $this->set(Posts::MENU_ORDER->value, $menu_order);
		}

		public string $post_type {
			get                     => $this->get(Posts::POST_TYPE->value);
			set (string $post_type) => $this->set(Posts::POST_TYPE->value, $post_type);
		}

		public string $post_mime_type {
			get                          => $this->get(Posts::POST_MIME_TYPE->value);
			set (string $post_mime_type) => $this->set(Posts::POST_MIME_TYPE->value, $post_mime_type);
		}

		public int $comment_count {
			get                      => $this->get(Posts::COMMENT_COUNT->value);
			set (int $comment_count) => $this->set(Posts::COMMENT_COUNT->value, $comment_count);
		}
	}