<?php

namespace RoosterLMS\Learn;

use RoosterLMS\Blocks\BlockRegistry;
use RoosterLMS\Blocks\Context;
use RoosterLMS\Content\PostTypes;
use RoosterLMS\Content\UnitType;
use RoosterLMS\Domain\Services;
use RoosterLMS\Media\MediaOwner;
use RoosterLMS\Media\MediaRole;
use RoosterLMS\Routing\RouteContext;

defined( 'ABSPATH' ) || exit;

final class LessonExtras {

	private static array $rendered = array();

	private static ?array $template = null;

	public static function rendered( string $name, int $item_id ): void {
		if ( $item_id > 0 && ! doing_filter( 'the_content' ) ) {
			self::$rendered[ $name ][ $item_id ] = true;
		}
	}

	public static function reset(): void {
		self::$rendered = array();
		self::$template = null;
	}

	public static function content( $content ) {
		if ( ! is_string( $content ) || ! is_singular( array( PostTypes::LESSON, PostTypes::QUIZ ) ) ) {
			return $content;
		}
		$post = get_post();
		if ( ! $post instanceof \WP_Post || (int) get_queried_object_id() !== (int) $post->ID || doing_filter( 'get_the_excerpt' ) || doing_filter( 'wp_trim_excerpt' ) || doing_action( 'wp_head' ) ) {
			return $content;
		}
		$item_id = RouteContext::item_id() > 0 ? RouteContext::item_id() : Context::item_id( array(), null );
		$item    = $item_id > 0 ? ( Services::curriculum_repo()->items( array( $item_id ) )[ $item_id ] ?? null ) : null;
		if ( null === $item ) {
			return $content;
		}
		$unit   = Services::unit_repo()->get_many( array( $item->unit_id ) )[ $item->unit_id ] ?? null;
		$before = '';
		$after  = '';
		if ( null !== $unit && UnitType::LESSON === $unit->type && true === \RoosterLMS\Core\Settings::get( 'lesson_media_in_use' ) && ! self::placed( $content, MediaPlayer::NAME, MediaPlayer::SHORTCODE, $item->id )
			&& null !== Services::media_repo()->for_owner( MediaOwner::UNIT, $item->unit_id, MediaRole::PRIMARY ) ) {
			$before = self::block( MediaPlayer::NAME, array( MediaPlayer::class, 'render' ) );
		}
		if ( null !== $unit && UnitType::ASSIGNMENT === $unit->type && ! self::placed( $content, AssignmentView::NAME, AssignmentView::SHORTCODE, $item->id ) ) {
			$after .= self::block( AssignmentView::NAME, array( AssignmentView::class, 'render' ) );
		}
		$user = get_current_user_id();
		if ( $user > 0 && ! self::placed( $content, QaView::NAME, QaView::SHORTCODE, $item->id )
			&& ( \RoosterLMS\Blocks\Learner::is_enrolled( $user, $item->course_id ) || current_user_can( 'edit_post', (int) $post->ID ) ) ) {
			if ( 'end' !== \RoosterLMS\Community\CommunitySettings::get( 'qa_place' ) ) {
				$after .= self::block( QaView::NAME, array( QaView::class, 'render' ), array( 'panel' => true ) );
			} elseif ( null !== $unit && UnitType::QUIZ === $unit->type ) {
				self::after_quiz();
			} else {
				$after .= self::block( QaView::NAME, array( QaView::class, 'render' ) );
			}
		}
		return $before . $content . $after;
	}

	public static function media_changed( $owner_type, $owner_id = 0, $role = 0, $what = '' ): void {
		unset( $owner_id, $role );
		if ( MediaOwner::UNIT->value === (int) $owner_type && 'set' === $what && true !== \RoosterLMS\Core\Settings::get( 'lesson_media_in_use' ) ) {
			\RoosterLMS\Core\Settings::update( array( 'lesson_media_in_use' => true ) );
		}
	}

	private static function after_quiz(): void {
		if ( has_filter( 'render_block_rooster-lms/quiz', array( self::class, 'append_qa' ) ) ) {
			return;
		}
		add_filter( 'render_block_rooster-lms/quiz', array( self::class, 'append_qa' ), 10, 1 );
	}

	public static function append_qa( $html ) {
		remove_filter( 'render_block_rooster-lms/quiz', array( self::class, 'append_qa' ), 10 );
		return is_string( $html ) ? $html . QaView::render( array() ) : $html;
	}

	private static function placed( string $content, string $name, string $shortcode, int $item_id ): bool {
		return has_block( 'rooster-lms/' . $name, $content ) || has_shortcode( $content, $shortcode ) || isset( self::$rendered[ $name ][ $item_id ] ) || self::in_template( $name );
	}

	private static function in_template( string $name ): bool {
		$content = isset( $GLOBALS['_wp_current_template_content'] ) && is_string( $GLOBALS['_wp_current_template_content'] ) ? $GLOBALS['_wp_current_template_content'] : '';
		if ( '' === $content ) {
			return false;
		}
		if ( null === self::$template || self::$template[0] !== $content ) {
			$names = array();
			self::collect( parse_blocks( $content ), $names, 0 );
			self::$template = array( $content, $names );
		}
		return isset( self::$template[1][ 'rooster-lms/' . $name ] );
	}

	private static function collect( array $blocks, array &$names, int $depth ): void {
		foreach ( $blocks as $block ) {
			$block_name = is_string( $block['blockName'] ?? null ) ? $block['blockName'] : '';
			if ( '' === $block_name ) {
				continue;
			}
			$names[ $block_name ] = true;
			$attrs                = is_array( $block['attrs'] ?? null ) ? $block['attrs'] : array();
			$inner                = '';
			if ( $depth < 5 && 'core/pattern' === $block_name && is_string( $attrs['slug'] ?? null ) ) {
				$pattern = \WP_Block_Patterns_Registry::get_instance()->get_registered( $attrs['slug'] );
				$inner   = is_array( $pattern ) && is_string( $pattern['content'] ?? null ) ? $pattern['content'] : '';
			}
			if ( '' !== $inner ) {
				self::collect( parse_blocks( $inner ), $names, $depth + 1 );
			}
			if ( is_array( $block['innerBlocks'] ?? null ) && array() !== $block['innerBlocks'] ) {
				self::collect( $block['innerBlocks'], $names, $depth );
			}
		}
	}

	private static function block( string $name, callable $render, array $attrs = array() ): string {
		return BlockRegistry::is_registered( $name ) ? "\n<!-- wp:rooster-lms/" . $name . ( array() === $attrs ? '' : ' ' . wp_json_encode( $attrs ) ) . " /-->\n" : (string) $render( $attrs );
	}
}