<?php
namespace Academy\Lesson\LessonApi;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

use Academy\Lesson\LessonApi\Models\Base\Lesson as LessonBaseModel;
class Lesson {
	protected static ?bool $is_hp = null;

	public static function is_hp( ?bool $is_hp = null ) {
		if ( is_bool( $is_hp ) ) {
			self::$is_hp = $is_hp;
		} elseif ( is_null( $is_hp ) && is_null( self::$is_hp ) ) {
			self::$is_hp = boolval( $GLOBALS['academy_settings']->academy_is_hp_lesson_active ?? true );
		}
		return self::$is_hp;
	}

	public static function get(
		int $page = 1,
		int $per_page = 10,
		?int $author_id = null,
		?string $search = '',
		?string $status = 'publish',
		bool $skip_meta = false,
		array $by_meta = []
	): Collection\Base\Collection {
		$class = self::is_hp() ? Collection\HpLessonCollection::class : Collection\PostLessonCollection::class;
		$status = 'any' === $status ? null : $status;
		return new $class( $page, $per_page, $author_id, $search, $status, $skip_meta, $by_meta );
	}

	/**
	 * The other place lessons can be kept. A site that changed how lessons are
	 * stored still has courses pointing at lessons in the old place, so reading
	 * one falls back to it rather than showing nothing.
	 *
	 * @return string Model class.
	 */
	protected static function other_model(): string {
		return self::is_hp() ? Models\PostLesson::class : Models\HpLesson::class;
	}

	/**
	 * Read a lesson from where lessons are kept, and from the other place when
	 * it is not there.
	 *
	 * @param string $method Model method.
	 * @param array  $args   Arguments.
	 * @return LessonBaseModel
	 * @throws \Throwable When the lesson is in neither place.
	 */
	protected static function read( string $method, array $args ): LessonBaseModel {
		$class = self::is_hp() ? Models\HpLesson::class : Models\PostLesson::class;
		try {
			return $class::$method( ...$args );
		} catch ( \Throwable $error ) {
			return self::other_model()::$method( ...$args );
		}
	}

	public static function get_by_id( int $id, bool $skip_meta = false, ?int $author = null, $status = null ): LessonBaseModel {
		return self::read( 'by_id', [ $id, $skip_meta, $author, $status ] );
	}

	public static function get_by_slug( string $slug, bool $skip_meta = false, ?int $author = null ): LessonBaseModel {
		return self::read( 'by_slug', [ $slug, $skip_meta, $author ] );
	}
	public static function get_by_title( string $title, bool $skip_meta = false, ?int $author = null ): LessonBaseModel {
		return self::read( 'by_title', [ $title, $skip_meta, $author ] );
	}

	public static function create( array $data = [], array $meta_data = [] ): LessonBaseModel {
		$class = self::is_hp() ? Models\HpLesson::class : Models\PostLesson::class;
		$lesson = new $class( $data, $meta_data );
		return $lesson;
	}

	public static function get_total_number_of_lessons( string $status = 'any', int $user_id = 0 ): int {
		$class = self::is_hp() ? Models\HpLesson::class : Models\PostLesson::class;
		return $class::get_total_number_of_lessons( $status, $user_id );
	}

	public static function get_lesson_slug( int $id ): ?string {
		$class = self::is_hp() ? Models\HpLesson::class : Models\PostLesson::class;
		$slug  = $class::get_slug_by_id( $id );

		return '' === (string) $slug || null === $slug ? self::other_model()::get_slug_by_id( $id ) : $slug;
	}
	public static function get_lesson_title( int $id ): ?string {
		$class = self::is_hp() ? Models\HpLesson::class : Models\PostLesson::class;
		$title = $class::get_title_by_id( $id );

		return '' === (string) $title || null === $title ? self::other_model()::get_title_by_id( $id ) : $title;
	}
	public static function get_lesson_meta_data( int $id ): array {
		$class = self::is_hp() ? Models\HpLesson::class : Models\PostLesson::class;
		$meta  = $class::get_lesson_meta_data( $id );

		return $meta ? $meta : self::other_model()::get_lesson_meta_data( $id );
	}
	public static function get_lesson_meta( int $id, string $key ) {
		$class = self::is_hp() ? Models\HpLesson::class : Models\PostLesson::class;
		$value = $class::get_lesson_meta( $id, $key );

		return null === $value || '' === $value ? self::other_model()::get_lesson_meta( $id, $key ) : $value;
	}
}