<?php

namespace RoosterLMS\Learn;

use RoosterLMS\Domain\Services;

defined( 'ABSPATH' ) || exit;

final class LessonButtons {

	public const OPTION = 'rooster_lms_lesson_buttons';

	public const KEYS = array( 'complete', 'nav', 'next_completes' );

	private static ?array $memo = null;

	private static array $learners = array();

	public static function defaults(): array {
		return array(
			'complete'       => true,
			'nav'            => true,
			'next_completes' => true,
		);
	}

	public static function site(): array {
		if ( null === self::$memo ) {
			$loaded     = wp_load_alloptions();
			$stored     = isset( $loaded[ self::OPTION ] ) ? maybe_unserialize( $loaded[ self::OPTION ] ) : array();
			self::$memo = self::sanitize( is_array( $stored ) ? $stored : array() );
		}
		return self::$memo;
	}

	public static function for_learner( int $user_id, int $course_id ): array {
		$site = self::site();
		if ( $user_id <= 0 || $course_id <= 0 ) {
			return $site;
		}
		if ( ! self::orgs_override() ) {
			return $site;
		}
		$key = $user_id . ':' . $course_id;
		if ( ! isset( self::$learners[ $key ] ) ) {
			$org_id                 = Services::steering()->org_for( $user_id, $course_id );
			$org                    = $org_id > 0 ? Services::org_repo()->get( $org_id ) : null;
			self::$learners[ $key ] = self::merge( $site, null === $org ? null : $org->settings->lesson_buttons );
		}
		return self::$learners[ $key ];
	}

	public static function orgs_override(): bool {
		return true === \RoosterLMS\Core\Settings::get( 'lesson_buttons_orgs' );
	}

	public static function note_org_override(): void {
		if ( ! self::orgs_override() ) {
			\RoosterLMS\Core\Settings::update( array( 'lesson_buttons_orgs' => true ) );
		}
	}

	public static function merge( array $site, ?array $overrides ): array {
		foreach ( self::clean_map( $overrides ) ?? array() as $key => $value ) {
			$site[ $key ] = $value;
		}
		return $site;
	}

	public static function clean_map( $raw ): ?array {
		if ( ! is_array( $raw ) ) {
			return null;
		}
		$out = array();
		foreach ( self::KEYS as $key ) {
			if ( array_key_exists( $key, $raw ) ) {
				$bool = is_bool( $raw[ $key ] ) ? $raw[ $key ] : filter_var( $raw[ $key ], FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE );
				if ( null !== $bool ) {
					$out[ $key ] = $bool;
				}
			}
		}
		return array() === $out ? null : $out;
	}

	public static function update( array $values ): void {
		update_option( self::OPTION, self::sanitize( array_merge( self::site(), $values ) ), true );
		self::forget();
	}

	public static function forget(): void {
		self::$memo     = null;
		self::$learners = array();
	}

	public static function sanitize( array $values ): array {
		$out = self::defaults();
		foreach ( self::KEYS as $key ) {
			if ( array_key_exists( $key, $values ) ) {
				$bool = filter_var( $values[ $key ], FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE );
				if ( null !== $bool ) {
					$out[ $key ] = $bool;
				}
			}
		}
		return $out;
	}
}