<?php

namespace RoosterLMS\Core;

defined( 'ABSPATH' ) || exit;

final class Settings {

	public const OPTION = 'rooster_lms_settings';

	private static ?array $raw = null;

	private static array $clean = array();

	public const BASES = array( 'course_base', 'category_base', 'lesson_category_base', 'certificate_base', 'person_base' );

	public const VERIFY_FIELDS = array( 'learner_name', 'course_title', 'completed_on', 'org_name', 'expires_on', 'score' );

	private const DEFAULTS = array(
		'course_base'                => 'courses',
		'category_base'              => 'course-category',
		'lesson_category_base'       => 'lesson-category',
		'show_learner_counts'        => false,
		'private_catalogue'          => false,
		'org_catalogue_listing'      => false,
		'learner_own_courses'        => false,
		'portal_page_id'             => 0,
		'keep_managers_out_admin'    => true,
		'portal_tabs_hidden'         => array(),
		'learner_menu_hidden'        => array(),
		'learner_role'               => true,
		'event_retention_days'       => 0,
		'delete_data_on_uninstall'   => false,
		'notify_welcome'             => false,
		'notify_programme'           => false,
		'notify_job_role'            => false,
		'notify_bulk'                => false,
		'notify_delay_minutes'       => 15,
		'brand_member_mail'          => false,
		'manageable_roles_extra'     => array(),
		'lms_portal_alias'           => false,
		'legacy_routes'              => array(),
		'certificate_base'           => 'certificate',
		'certificate_verify_fields'  => array( 'learner_name', 'course_title', 'completed_on' ),
		'certificate_verify_page_id' => 0,
		'certificate_default_tpl'    => 0,
		'attendance_default_tpl'     => 0,
		'ui_primary'                 => 'rooster',
		'ui_dark'                    => 'off',
		'ui_buttons'                 => 'rooster',
		'ui_shell_max'               => 0,
		'ui_shell_pad'               => 15,
		'ui_look'                    => 'rooster-one',
		'staff_course_access'        => true,
		'manager_course_access'      => true,
		'notify_results'             => false,
		'question_grace_ms'          => 3000,
		'feedback_min_group'         => 5,
		'feedback_comments'          => true,
		'policies_in_use'            => false,
		'feedback_in_use'            => false,
		'account_page_id'            => 0,
		'notify_announcements'       => false,
		'notify_live_reminders'      => true,
		'notify_live_changes'        => true,
		'notify_live_recordings'     => true,
		'search_all_languages'       => false,
		'live_join_before'           => 10,
		'live_timezone'              => '',
		'live_hide_ended_links'      => true,
		'scope_in_use'               => false,
		'sales_end_pending'          => false,
		'offers_soft_optin'          => false,
		'offers_weekly_cap'          => 2,
		'plan_grace_days'            => 14,
		'registration_page_id'       => 0,
		'registration_takeover'      => false,
		'register_opens'             => 'popup',
		'quiet_notices'              => 'off',
		'msg_track'                  => false,
		'msg_quiet_hours'            => false,
		'msg_quiet_from'             => 22,
		'msg_quiet_to'               => 8,
		'learner_inactive_days'      => 0,
		'apparent_root'              => '',
		'apparent_root_logo'         => 0,
		'apparent_root_color'        => '',
		'person_base'                => 'persons',
		'person_name_order'          => 'family',
		'gravatar'                   => false,
		'person_links_new_tab'       => false,
		'person_redirects'           => true,
		'inv_rsvp'                   => 3,
		'inv_close_hours'            => 24,
		'inv_yes_action'             => 'none',
		'inv_from_name'              => '',
		'points_enabled'             => false,
		'points_label'               => '',
		'points_rate'                => 0,
		'points_leaderboard_names'   => false,
		'session_limit'              => 0,
		'catalogue_per_page'         => 0,
		'catalogue_filters'          => array(),
		'catalogue_filter_order'     => array(),
		'catalogue_featured'         => 0,
		'catalogue_related'          => true,
		'catalogue_org_byline'       => false,
		'course_premoderation'       => false,
		'guest_preview'              => true,
		'page_templates_in_use'      => false,
		'demo_page'                  => 0,
		'media_required_in_use'      => false,
		'lesson_buttons_orgs'        => false,
		'assignment_file_types'      => array( 'pdf', 'doc', 'docx', 'odt', 'rtf', 'txt', 'jpg', 'jpeg', 'png', 'gif', 'zip' ),
		'assignment_max_file_mb'     => 10,
		'assignment_max_files'       => 5,
		'assignment_audio'           => false,
		'assignment_video'           => false,
		'assignment_media_max_mb'    => 50,
		'grade_scales_in_use'        => false,
		'affiliate_link_template'    => '',
		'question_draws_in_use'      => false,
		'skills_in_use'              => false,
		'h5p_hub_enabled'            => false,
		'h5p_usage_stats'            => false,
		'h5p_look'                   => 'rooster',
		'h5p_corners'                => 'preset',
		'h5p_density'                => 'preset',
		'h5p_buttons'                => 'preset',
		'course_file_types'          => array( 'pdf', 'doc', 'docx', 'odt', 'rtf', 'txt', 'csv', 'xls', 'xlsx', 'ods', 'ppt', 'pptx', 'odp', 'zip', 'jpg', 'jpeg', 'png', 'gif', 'webp', 'mp4', 'm4v', 'webm', 'mov', 'mp3', 'm4a', 'wav', 'ogg', 'vtt' ),
		'library_open_types'         => array( 'jpg', 'jpeg', 'png', 'gif', 'webp', 'mp4', 'm4v', 'webm', 'mov', 'mp3', 'm4a', 'wav', 'ogg' ),
		'online_tests_course'        => 0,
		'lesson_media_in_use'        => false,
		'course_jsonld_faq'          => false,
		'course_jsonld_rating'       => false,
		'translation_create'         => 'copy',
		'default_editor'             => 'designer',
		'designer_fold_menu'         => true,
		'admin_ui_language'          => 'switcher',
		'reading_wpm'                => 200,
	);

	public const CHOICES = array(
		'ui_primary'         => array( 'rooster', 'theme' ),
		'ui_dark'            => array( 'off', 'auto', 'on' ),
		'ui_buttons'         => array( 'rooster', 'theme' ),
		'quiet_notices'      => array( 'off', 'ours', 'all' ),
		'register_opens'     => array( 'popup', 'page' ),
		'person_name_order'  => array( 'family', 'written' ),
		'inv_yes_action'     => array( 'none', 'register', 'enrol' ),
		'translation_create' => array( 'copy', 'plugin' ),
		'default_editor'     => array( 'designer', 'block' ),
		'admin_ui_language'  => array( 'profile', 'switcher' ),
		'h5p_look'          => array( 'rooster', 'theme', 'compact' ),
		'h5p_corners'       => array( 'preset', 'square', 'soft', 'round' ),
		'h5p_density'       => array( 'preset', 'comfortable', 'compact' ),
		'h5p_buttons'       => array( 'preset', 'filled', 'outline' ),
	);

	public const CATALOGUE_FILTERS = array( 'category', 'subcategory', 'level', 'format', 'date', 'location', 'price', 'rating', 'instructor', 'status', 'availability' );

	public const FILTER_ORDER = array( 'category', 'level', 'format', 'date', 'location', 'price', 'rating', 'instructor', 'status', 'availability' );

	public const LEGACY_ROUTE_KEYS = array( 'course', 'player', 'category', 'lesson', 'account' );

	private const RANGES = array(
		'notify_delay_minutes'    => array( 1, 1440 ),
		'ui_shell_max'            => array( 0, 3840 ),
		'ui_shell_pad'            => array( 0, 200 ),
		'question_grace_ms'       => array( 0, 10000 ),
		'feedback_min_group'      => array( 1, 50 ),
		'live_join_before'        => array( 0, 1440 ),
		'offers_weekly_cap'       => array( 0, 14 ),
		'plan_grace_days'         => array( 0, 90 ),
		'msg_quiet_from'          => array( 0, 23 ),
		'msg_quiet_to'            => array( 0, 23 ),
		'learner_inactive_days'   => array( 0, 365 ),
		'inv_rsvp'                => array( 0, 7 ),
		'inv_close_hours'         => array( 0, 720 ),
		'points_rate'             => array( 0, 100000 ),
		'session_limit'           => array( 0, 20 ),
		'catalogue_per_page'      => array( 0, 100 ),
		'catalogue_featured'      => array( 0, 50 ),
		'assignment_max_file_mb'  => array( 1, 512 ),
		'assignment_max_files'    => array( 1, 50 ),
		'assignment_media_max_mb' => array( 1, 2048 ),
		'reading_wpm'             => array( 50, 1000 ),
	);

	public const FROM_NAME_MAX = 100;

	public static function get( string $key ) {
		if ( ! array_key_exists( $key, self::DEFAULTS ) ) {
			return null;
		}
		$all = self::all();
		return $all[ $key ];
	}

	public static function base( string $key ): string {
		return in_array( $key, self::BASES, true ) ? urldecode( (string) self::get( $key ) ) : '';
	}

	public static function all(): array {
		$stored = get_option( self::OPTION, array() );
		$stored = is_array( $stored ) ? $stored : array();
		if ( $stored !== self::$raw ) {
			self::$raw   = $stored;
			self::$clean = self::sanitize( $stored );
		}
		return self::$clean;
	}

	public static function update( array $values ): void {
		$old = self::all();
		$new = self::sanitize( array_merge( $old, $values ) );
		update_option( self::OPTION, $new, true );
		foreach ( self::BASES as $key ) {
			if ( $old[ $key ] !== $new[ $key ] ) {
				update_option( Migrator::FLUSH_OPTION, 1, true );
				break;
			}
		}
	}

	public static function ensure_defaults(): void {
		add_option( self::OPTION, self::DEFAULTS, '', true );
		add_option( \RoosterLMS\Community\CommunitySettings::OPTION, array(), '', true );
	}

	public static function sanitize( array $values ): array {
		$clean = array();
		foreach ( self::DEFAULTS as $key => $default ) {
			$value = $values[ $key ] ?? $default;
			if ( is_bool( $default ) ) {
				$bool          = filter_var( $value, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE );
				$clean[ $key ] = null === $bool ? $default : $bool;
			} elseif ( is_int( $default ) ) {
				$clean[ $key ] = is_numeric( $value ) ? max( 0, (int) $value ) : $default;
				if ( isset( self::RANGES[ $key ] ) ) {
					$clean[ $key ] = max( self::RANGES[ $key ][0], min( self::RANGES[ $key ][1], $clean[ $key ] ) );
				}
			} elseif ( is_array( $default ) ) {
				$clean[ $key ] = self::sanitize_array( $key, $value );
			} elseif ( 'live_timezone' === $key ) {
				$zone          = is_string( $value ) ? trim( $value ) : '';
				$clean[ $key ] = '' !== $zone && \RoosterLMS\Live\Schedule::is_zone( $zone ) ? $zone : '';
			} elseif ( 'apparent_root' === $key ) {
				$clean[ $key ] = \RoosterLMS\Orgs\ApparentRoot::format( \RoosterLMS\Orgs\ApparentRoot::parse( $value ) );
			} elseif ( 'apparent_root_color' === $key ) {
				$clean[ $key ] = is_string( $value ) ? (string) sanitize_hex_color( strtolower( trim( $value ) ) ) : '';
			} elseif ( 'points_label' === $key ) {
				$clean[ $key ] = is_string( $value ) ? mb_substr( sanitize_text_field( $value ), 0, 60 ) : '';
			} elseif ( 'affiliate_link_template' === $key ) {
				$clean[ $key ] = self::link_template( $value );
			} elseif ( 'inv_from_name' === $key ) {
				$clean[ $key ] = is_string( $value ) ? mb_substr( sanitize_text_field( $value ), 0, self::FROM_NAME_MAX ) : '';
			} elseif ( 'ui_look' === $key ) {
				$value         = is_string( $value ) ? strtolower( trim( $value ) ) : '';
				$clean[ $key ] = 1 === preg_match( \RoosterLMS\Orgs\OrgSettings::LOOK_KEY, $value ) ? $value : $default;
			} elseif ( isset( self::CHOICES[ $key ] ) ) {
				$value         = is_string( $value ) ? strtolower( trim( $value ) ) : '';
				$hex           = 'ui_primary' === $key ? (string) sanitize_hex_color( $value ) : '';
				$clean[ $key ] = in_array( $value, self::CHOICES[ $key ], true ) ? $value : ( '' !== $hex ? $hex : $default );
			} else {
				$slug          = is_string( $value ) ? sanitize_title( $value ) : '';
				$clean[ $key ] = '' !== $slug ? $slug : $default;
			}
		}
		return $clean;
	}

	public static function link_template( $value ): string {
		$value = is_string( $value ) ? trim( $value ) : '';
		if ( '' === $value || strlen( $value ) > 500 || 1 !== preg_match( '#^https?://[^\s/?\#{}]+[^\s<>"\']*$#i', $value ) ) {
			return '';
		}
		return $value;
	}

	private static function sanitize_array( string $key, $value ): array {
		if ( 'portal_tabs_hidden' === $key ) {
			return \RoosterLMS\Blocks\PortalTabs::clean_list( $value );
		}
		if ( 'learner_menu_hidden' === $key ) {
			return \RoosterLMS\Account\Sections::clean_hidden( $value );
		}
		if ( in_array( $key, array( 'assignment_file_types', 'course_file_types', 'library_open_types' ), true ) ) {
			if ( is_string( $value ) ) {
				$value = preg_split( '/[\s,;|]+/', $value, -1, PREG_SPLIT_NO_EMPTY );
			}
			if ( ! is_array( $value ) ) {
				return self::DEFAULTS[ $key ];
			}
			$out = array();
			foreach ( $value as $ext ) {
				$ext = is_string( $ext ) ? (string) preg_replace( '/[^a-z0-9]/', '', strtolower( ltrim( trim( $ext ), '.' ) ) ) : '';
				if ( '' !== $ext && strlen( $ext ) <= 10 ) {
					$out[ $ext ] = $ext;
				}
			}
			return array_slice( array_values( $out ), 0, 100 );
		}
		if ( 'catalogue_filters' === $key ) {
			return is_array( $value ) ? array_values( array_unique( array_intersect( array_map( 'strval', array_filter( $value, 'is_string' ) ), self::CATALOGUE_FILTERS ) ) ) : array();
		}
		if ( 'catalogue_filter_order' === $key ) {
			$given = is_array( $value ) ? array_values( array_unique( array_intersect( array_map( 'strval', array_filter( $value, 'is_string' ) ), self::FILTER_ORDER ) ) ) : array();
			return array() === $given ? array() : array_values( array_merge( $given, array_diff( self::FILTER_ORDER, $given ) ) );
		}
		if ( 'certificate_verify_fields' === $key ) {
			if ( ! is_array( $value ) ) {
				return self::DEFAULTS['certificate_verify_fields'];
			}
			$wanted = array_map( 'strval', array_filter( $value, 'is_string' ) );
			return array_values( array_intersect( self::VERIFY_FIELDS, $wanted ) );
		}
		if ( ! is_array( $value ) ) {
			return array();
		}
		if ( 'legacy_routes' === $key ) {
			$out = array();
			foreach ( self::LEGACY_ROUTE_KEYS as $route ) {
				$slug = isset( $value[ $route ] ) && is_string( $value[ $route ] ) ? sanitize_title( $value[ $route ] ) : '';
				if ( '' !== $slug ) {
					$out[ $route ] = $slug;
				}
			}
			return $out;
		}
		$out = array();
		foreach ( $value as $item ) {
			$role = is_string( $item ) ? sanitize_key( $item ) : '';
			if ( '' !== $role && ! in_array( $role, $out, true ) ) {
				$out[] = $role;
			}
		}
		return $out;
	}
}