<?php

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

if ( ! class_exists( 'AIEO_Runtime_Birthday', false ) ) {

	class AIEO_Runtime_Birthday {

		const OPTION_KEY = 'aieo_dmm_birthday';
		const FIELD_ID   = 'aieo/birthday'; 
		const META_KEY   = '_wc_other/aieo/birthday';
		
		
		
		const FIELD_DAY   = 'aieo/birthday_day';
		const FIELD_MONTH = 'aieo/birthday_month';
		const FIELD_YEAR  = 'aieo/birthday_year';
		const META_DAY    = '_wc_other/aieo/birthday_day';
		const META_MONTH  = '_wc_other/aieo/birthday_month';
		const META_YEAR   = '_wc_other/aieo/birthday_year';

		
		private static $instance = null;

		public static function instance() {
			if ( null === self::$instance ) {
				self::$instance = new self();
			}
			return self::$instance;
		}

		private function __construct() {
			$s = $this->get_settings();

			
			
			
			
			
			add_filter( 'wp_privacy_personal_data_exporters', array( $this, 'register_exporter' ) );
			add_filter( 'wp_privacy_personal_data_erasers', array( $this, 'register_eraser' ) );

			if ( 'yes' !== $s['enabled'] ) {
				return; 
			}
			
			
			
			
			if ( did_action( 'woocommerce_init' ) && function_exists( 'woocommerce_register_additional_checkout_field' ) ) {
				$this->register_fields( $s );
			} elseif ( ! did_action( 'woocommerce_init' ) ) {
				add_action( 'woocommerce_init', function () use ( $s ) {
					$this->register_fields( $s );
				}, 20 );
			} else {
				add_action( 'woocommerce_blocks_loaded', function () use ( $s ) {
					$this->register_fields( $s );
				} );
			}
			
			
			add_filter( 'woocommerce_get_default_value_for_' . self::FIELD_DAY, array( $this, 'default_day' ), 10, 3 );
			add_filter( 'woocommerce_get_default_value_for_' . self::FIELD_MONTH, array( $this, 'default_month' ), 10, 3 );
			add_filter( 'woocommerce_get_default_value_for_' . self::FIELD_YEAR, array( $this, 'default_year' ), 10, 3 );

			
			
			add_action( 'wp_footer', array( $this, 'checkout_message_script' ) );

			
			
			
			
			
			add_action( 'woocommerce_store_api_checkout_update_order_meta', array( $this, 'sync_to_user_meta' ) );
			add_action( 'woocommerce_store_api_checkout_order_processed', array( $this, 'sync_to_user_meta' ) );

			
			
			
			
			
			add_action( 'woocommerce_edit_account_form', array( $this, 'render_account_field' ) );
			add_action( 'woocommerce_save_account_details_errors', array( $this, 'save_account_field' ), 10, 2 );
			
			
			add_action( 'template_redirect', array( $this, 'suppress_aw_birthdays_account_field' ), 1 );
		}

		
		
		

		
		const DOB_META_KEYS = array( 'aieo_birthday_md', 'aieo_birthday_full', '_automatewoo_birthday_md', '_automatewoo_birthday_full' );

		public function register_exporter( $exporters ) {
			$exporters['aieo-birthday'] = array(
				'exporter_friendly_name' => __( 'Rooster One — Birthday', 'ai-eshop-optimizer' ),
				'callback'               => array( $this, 'export_birthday' ),
			);
			return $exporters;
		}

		public function register_eraser( $erasers ) {
			$erasers['aieo-birthday'] = array(
				'eraser_friendly_name' => __( 'Rooster One — Birthday', 'ai-eshop-optimizer' ),
				'callback'             => array( $this, 'erase_birthday' ),
			);
			return $erasers;
		}

		
		public function export_birthday( $email, $page = 1 ) {
			$data = array();
			$user = get_user_by( 'email', $email );
			if ( $user ) {
				$md = (string) get_user_meta( $user->ID, 'aieo_birthday_md', true );
				if ( '' === $md ) {
					$md = (string) get_user_meta( $user->ID, '_automatewoo_birthday_md', true );
				}
				$full = (string) get_user_meta( $user->ID, 'aieo_birthday_full', true );
				if ( '' === $full ) {
					$full = (string) get_user_meta( $user->ID, '_automatewoo_birthday_full', true );
				}
				$items = array();
				if ( '' !== $md ) {
					$items[] = array( 'name' => __( 'Birthday (month-day, MM-DD)', 'ai-eshop-optimizer' ), 'value' => $md );
				}
				if ( '' !== $full ) {
					$items[] = array( 'name' => __( 'Date of birth', 'ai-eshop-optimizer' ), 'value' => $full );
				}
				if ( $items ) {
					$data[] = array(
						'group_id'    => 'aieo-birthday',
						'group_label' => __( 'Birthday', 'ai-eshop-optimizer' ),
						'item_id'     => 'aieo-birthday-' . (int) $user->ID,
						'data'        => $items,
					);
				}
			}
			return array( 'data' => $data, 'done' => true );
		}

		
		public function erase_birthday( $email, $page = 1 ) {
			$removed = false;
			$user    = get_user_by( 'email', $email );
			if ( $user ) {
				foreach ( self::DOB_META_KEYS as $k ) {
					if ( '' !== (string) get_user_meta( $user->ID, $k, true ) ) {
						delete_user_meta( $user->ID, $k );
						$removed = true;
					}
				}
			}
			return array(
				'items_removed'  => $removed,
				'items_retained' => false,
				'messages'       => $removed ? array( __( 'Birthday removed. The customer may set a new birthday from My Account.', 'ai-eshop-optimizer' ) ) : array(),
				'done'           => true,
			);
		}

		private function register_fields( $s ) {
			$label = (string) $s['label'];
			try {
				woocommerce_register_additional_checkout_field( array(
					'id'         => self::FIELD_DAY,
					
					'label'      => __( 'Day', 'ai-eshop-optimizer' ),
					'location'   => 'order',
					'type'       => 'select',
					'required'   => false,
					'options'    => self::day_options(),
					'attributes' => array( 'data-aieo-bday' => 'day' ),
				) );
				woocommerce_register_additional_checkout_field( array(
					'id'         => self::FIELD_MONTH,
					
					'label'      => __( 'Month', 'ai-eshop-optimizer' ),
					'location'   => 'order',
					'type'       => 'select',
					'required'   => false,
					'options'    => self::month_options(),
					'attributes' => array( 'data-aieo-bday' => 'month' ),
				) );
				woocommerce_register_additional_checkout_field( array(
					'id'         => self::FIELD_YEAR,
					
					'label'      => __( 'Year', 'ai-eshop-optimizer' ),
					'location'   => 'order',
					'type'       => 'select',
					'required'   => false,
					'options'    => self::year_options(),
					'attributes' => array( 'data-aieo-bday' => 'year' ),
				) );
			} catch ( \Throwable $e ) {
				
				
				unset( $e );
			}
		}

		
		private static function day_options() {
			$o = array();
			for ( $d = 1; $d <= 31; $d++ ) {
				$o[] = array( 'value' => (string) $d, 'label' => (string) $d );
			}
			return $o;
		}
		private static function month_options() {
			$loc = ( isset( $GLOBALS['wp_locale'] ) && is_object( $GLOBALS['wp_locale'] ) ) ? $GLOBALS['wp_locale'] : null;
			$o   = array();
			for ( $m = 1; $m <= 12; $m++ ) {
				$o[] = array( 'value' => (string) $m, 'label' => $loc ? (string) $loc->get_month( $m ) : (string) $m );
			}
			return $o;
		}
		private static function year_options() {
			$o    = array();
			$year = (int) gmdate( 'Y' );
			for ( $y = $year; $y >= $year - 100; $y-- ) {
				$o[] = array( 'value' => (string) $y, 'label' => (string) $y );
			}
			return $o;
		}

		
		public function default_day( $value = '' )   { return $this->prefill_part( 'day', $value ); }
		public function default_month( $value = '' ) { return $this->prefill_part( 'month', $value ); }
		public function default_year( $value = '' )  { return $this->prefill_part( 'year', $value ); }

		private function prefill_part( $part, $value = '' ) {
			$uid = get_current_user_id();
			if ( $uid <= 0 ) {
				return $value;
			}
			$full = (string) get_user_meta( $uid, 'aieo_birthday_full', true );
			if ( '' === $full ) {
				$full = (string) get_user_meta( $uid, '_automatewoo_birthday_full', true );
			}
			$md = (string) get_user_meta( $uid, 'aieo_birthday_md', true );
			if ( '' === $md ) {
				$md = (string) get_user_meta( $uid, '_automatewoo_birthday_md', true );
			}
			$y = 0;
			$m = 0;
			$d = 0;
			if ( '' !== $full && preg_match( '#^(\d{4})-(\d{2})-(\d{2})$#', $full, $mm ) ) {
				$y = (int) $mm[1];
				$m = (int) $mm[2];
				$d = (int) $mm[3];
			} elseif ( '' !== $md && preg_match( '#^(\d{2})-(\d{2})$#', $md, $mm ) ) {
				$m = (int) $mm[1];
				$d = (int) $mm[2];
			}
			if ( 'day' === $part ) {
				return $d > 0 ? (string) $d : $value;
			}
			if ( 'month' === $part ) {
				return $m > 0 ? (string) $m : $value;
			}
			return $y > 0 ? (string) $y : $value;
		}

		
		public function checkout_message_script() {
			if ( ! function_exists( 'is_checkout' ) || ! is_checkout() ) {
				return;
			}
			$s = $this->get_settings();
			if ( 'yes' !== $s['enabled'] ) {
				return;
			}
			$msg = isset( $s['message'] ) ? trim( (string) $s['message'] ) : '';
			if ( '' === $msg ) {
				return;
			}
			$msg = wp_kses( $msg, array( 'strong' => array(), 'em' => array(), 'br' => array() ) );
			$bg  = function_exists( 'sanitize_hex_color' ) ? sanitize_hex_color( (string) ( $s['message_bg'] ?? '' ) ) : '';
			$txt = function_exists( 'sanitize_hex_color' ) ? sanitize_hex_color( (string) ( $s['message_text'] ?? '' ) ) : '';
			if ( ! $bg )  { $bg  = '#fff6e5'; }
			if ( ! $txt ) { $txt = '#5b4400'; }
			?>
			<style>
			.aieo-bday-intro{margin:8px 0 4px;padding:10px 12px;background:<?php echo esc_html( $bg ); ?>;border:1px solid rgba(0,0,0,.08);border-radius:8px;color:<?php echo esc_html( $txt ); ?>;font-size:14px;line-height:1.5}
			/* Day / Month / Year on ONE compact row. Keys off the durable data-aieo-bday
			   attribute WC keeps on each <select> (survives block re-render) via :has()
			   on the field wrapper — no fragile DOM moves. The three render as adjacent
			   siblings (no inter-element whitespace), so 3×(1/3) + two 8px gaps == 100%. */
			/* (Day/Month/Year one-row layout is applied in JS below.) */
						</style>
			<script>
			(function(){
				var MSG=<?php echo wp_json_encode( $msg ); ?>;
					function findCells(){
						var sels=document.querySelectorAll('select[data-aieo-bday]');
						if(sels.length<2)return null;
						var cells=[],container=null;
						for(var k=0;k<sels.length;k++){
							var cell=sels[k];
							while(cell.parentElement&&cell.parentElement.querySelectorAll('select[data-aieo-bday]').length===1){cell=cell.parentElement;}
							if(container&&container!==cell.parentElement)return null;
							cells.push(cell);container=cell.parentElement;
						}
						return container?{cells:cells,container:container}:null;
					}
					// Banner on its OWN full-width row, then Day/Month/Year sharing one row underneath.
					// Force the field container to flex-wrap; each birthday cell = 1/Nth width, and every
					// OTHER direct child (banner, marketing opt-in, order note) spans 100%. The banner is
					// inserted as a DIRECT child of the container (before the first cell) so it flows in the
					// same context. Idempotent + re-applied by the observer, so a React re-render self-heals.
					function layoutRow(){
						var f=findCells();if(!f)return;
						var container=f.container,cells=f.cells;
						if(MSG&&!container.querySelector(':scope > .aieo-bday-intro')){
							var box=document.createElement('div');
							box.className='aieo-bday-intro';
							box.innerHTML=MSG;
							container.insertBefore(box,cells[0]);
						}
						if(container.style.display!=='flex')container.style.display='flex';
						container.style.flexWrap='wrap';
						container.style.columnGap='8px';
						container.style.rowGap='6px';
						var basis='calc((100% - '+(8*(cells.length-1))+'px)/'+cells.length+')';
						var kids=container.children;
						for(var i=0;i<kids.length;i++){
							var kid=kids[i],isCell=cells.indexOf(kid)!==-1;
							kid.style.flex=isCell?('0 0 '+basis):'0 0 100%';
							kid.style.maxWidth=isCell?basis:'100%';
							if(isCell){kid.style.marginRight='0';kid.style.marginBottom='0';}
						}
					}
					// Strip WC's redundant trailing "(optional)" from each birthday label + placeholder.
					function tidy(){
						var ss=document.querySelectorAll('select[data-aieo-bday]');
						for(var i=0;i<ss.length;i++){
							var sx=ss[i],w=sx.closest('.wc-block-components-select')||sx.parentElement,l=w&&w.querySelector('label');
							if(l){var t=l.textContent,s=t.replace(/\s*\([^)]*\)\s*$/,'').trim();if(s&&s!==t){l.textContent=s;}}
							var o=sx.querySelector('option[value=""]');
							if(o&&o.textContent!=='-'){o.textContent='-';}
						}
					}
					function run(){layoutRow();tidy();}
					run();
					if(window.MutationObserver){
						var mo=new MutationObserver(function(){run();});
						mo.observe(document.documentElement,{childList:true,subtree:true});
					}
})();

			</script>
			<?php
		}

		
		public function sync_to_user_meta( $order ) {
			if ( ! is_a( $order, 'WC_Order' ) ) {
				return;
			}
			
			
			$day   = (int) $order->get_meta( self::META_DAY );
			$month = (int) $order->get_meta( self::META_MONTH );
			$year  = (int) $order->get_meta( self::META_YEAR );
			if ( $day > 0 || $month > 0 ) {
				$md   = self::mk_md( $month, $day );
				$full = ( '' !== $md && $year > 0 && checkdate( $month, $day, $year ) ) ? sprintf( '%04d-%s', $year, $md ) : '';
				$raw  = ( '' !== $md ) ? ( $year > 0 ? sprintf( '%02d/%02d/%04d', $day, $month, $year ) : sprintf( '%02d/%02d', $day, $month ) ) : '';
			} else {
				$raw  = trim( (string) $order->get_meta( self::META_KEY ) );
				$md   = self::parse_md( $raw );
				$full = self::parse_full( $raw );
			}
			if ( '' === $md ) {
				return; 
			}
			$order->update_meta_data( '_aieo_birthday_raw', $raw );
			$order->update_meta_data( '_aieo_birthday_md', $md );
			$order->save();

			$user_id = (int) $order->get_customer_id();
			if ( $user_id > 0 && '' !== $md ) {
				
				
				
				$existing = (string) get_user_meta( $user_id, 'aieo_birthday_md', true );
				if ( '' === $existing ) {
					$existing = (string) get_user_meta( $user_id, '_automatewoo_birthday_md', true );
				}
				if ( '' !== $existing ) {
					return;
				}
				
				
				
				update_user_meta( $user_id, 'aieo_birthday_md', $md );
				update_user_meta( $user_id, '_automatewoo_birthday_md', $md );
				if ( '' !== $full ) {
					update_user_meta( $user_id, 'aieo_birthday_full', $full );
					update_user_meta( $user_id, '_automatewoo_birthday_full', $full );
				} else {
					
					
					
					$existing = (string) get_user_meta( $user_id, 'aieo_birthday_full', true );
					if ( '' !== $existing && substr( $existing, 5 ) !== $md ) {
						delete_user_meta( $user_id, 'aieo_birthday_full' );
						delete_user_meta( $user_id, '_automatewoo_birthday_full' );
					}
				}
			}
		}

		
		public function render_account_field() {
			$user_id = get_current_user_id();
			if ( $user_id <= 0 ) {
				return;
			}
			$md = (string) get_user_meta( $user_id, 'aieo_birthday_md', true );
			if ( '' === $md ) {
				$md = (string) get_user_meta( $user_id, '_automatewoo_birthday_md', true ); 
			}
			$full = (string) get_user_meta( $user_id, 'aieo_birthday_full', true );
			if ( '' === $full ) {
				$full = (string) get_user_meta( $user_id, '_automatewoo_birthday_full', true );
			}
			$locked = ( '' !== $md );

			$sel_d = 0;
			$sel_m = 0;
			$sel_y = 0;
			if ( '' !== $full && preg_match( '#^(\d{4})-(\d{2})-(\d{2})$#', $full, $mm ) ) {
				$sel_y = (int) $mm[1];
				$sel_m = (int) $mm[2];
				$sel_d = (int) $mm[3];
			} elseif ( '' !== $md && preg_match( '#^(\d{2})-(\d{2})$#', $md, $mm ) ) {
				$sel_m = (int) $mm[1];
				$sel_d = (int) $mm[2];
			}

			$s     = $this->get_settings();
			$label = ( '' !== trim( (string) $s['label'] ) ) ? (string) $s['label'] : __( 'Birthday', 'ai-eshop-optimizer' );
			$dis   = $locked ? ' disabled' : '';
			$loc   = ( isset( $GLOBALS['wp_locale'] ) && is_object( $GLOBALS['wp_locale'] ) ) ? $GLOBALS['wp_locale'] : null;

			echo '<fieldset class="aieo-account-birthday woocommerce-form-row form-row form-row-wide" style="margin-top:6px;border:0;padding:0;">';
			echo '<legend style="float:none;font-weight:600;margin-bottom:6px;padding:0;">' . esc_html( $label ) . '</legend>';
			$msg = isset( $s['message'] ) ? trim( (string) $s['message'] ) : '';
			if ( '' !== $msg ) {
				$bg  = function_exists( 'sanitize_hex_color' ) ? sanitize_hex_color( (string) ( $s['message_bg'] ?? '' ) ) : '';
				$txt = function_exists( 'sanitize_hex_color' ) ? sanitize_hex_color( (string) ( $s['message_text'] ?? '' ) ) : '';
				if ( ! $bg )  { $bg  = '#fff6e5'; }
				if ( ! $txt ) { $txt = '#5b4400'; }
				echo '<p class="aieo-account-birthday__intro" style="margin:0 0 8px;padding:10px 12px;background:' . esc_attr( $bg ) . ';border:1px solid rgba(0,0,0,.08);border-radius:8px;color:' . esc_attr( $txt ) . ';font-size:13px;line-height:1.5;">' . wp_kses( $msg, array( 'strong' => array(), 'em' => array(), 'br' => array() ) ) . '</p>';
			}
			echo '<span class="aieo-account-birthday__fields" style="display:flex;gap:8px;flex-wrap:wrap;">';

			echo '<select name="aieo_birthday_day" aria-label="' . esc_attr__( 'Day', 'ai-eshop-optimizer' ) . '" style="flex:1 1 0;min-width:0;"' . $dis . '>';
			echo '<option value="">' . esc_html__( 'Day', 'ai-eshop-optimizer' ) . '</option>';
			for ( $d = 1; $d <= 31; $d++ ) {
				echo '<option value="' . (int) $d . '"' . selected( $sel_d, $d, false ) . '>' . (int) $d . '</option>';
			}
			echo '</select>';

			echo '<select name="aieo_birthday_month" aria-label="' . esc_attr__( 'Month', 'ai-eshop-optimizer' ) . '" style="flex:1 1 0;min-width:0;"' . $dis . '>';
			echo '<option value="">' . esc_html__( 'Month', 'ai-eshop-optimizer' ) . '</option>';
			for ( $m = 1; $m <= 12; $m++ ) {
				$mname = $loc ? $loc->get_month( $m ) : (string) $m;
				echo '<option value="' . (int) $m . '"' . selected( $sel_m, $m, false ) . '>' . esc_html( $mname ) . '</option>';
			}
			echo '</select>';

			echo '<select name="aieo_birthday_year" aria-label="' . esc_attr__( 'Year', 'ai-eshop-optimizer' ) . '" style="flex:1 1 0;min-width:0;"' . $dis . '>';
			echo '<option value="">' . esc_html__( 'Year (optional)', 'ai-eshop-optimizer' ) . '</option>';
			$this_year = (int) gmdate( 'Y' );
			for ( $y = $this_year; $y >= $this_year - 100; $y-- ) {
				echo '<option value="' . (int) $y . '"' . selected( $sel_y, $y, false ) . '>' . (int) $y . '</option>';
			}
			echo '</select>';

			echo '</span>';

			$note = $locked
				? __( 'Your birthday can’t be changed once set.', 'ai-eshop-optimizer' )
				: __( 'Add your birthday to receive a discount coupon and personalised offers on your birthday. It can’t be changed once saved.', 'ai-eshop-optimizer' );
			echo '<span class="aieo-account-birthday__note" style="display:block;color:#6b7280;font-size:12px;margin-top:6px;">' . esc_html( $note ) . '</span>';
			echo '</fieldset>';
		}

		
		public function save_account_field( $errors, $user ) {
			if ( ! is_a( $user, 'WP_User' ) || (int) $user->ID <= 0 ) {
				return;
			}
			
			
			
			
			if ( ( is_a( $errors, 'WP_Error' ) && $errors->get_error_messages() ) || 0 !== wc_notice_count( 'error' ) ) {
				return;
			}
			$user_id = (int) $user->ID;

			
			$existing = (string) get_user_meta( $user_id, 'aieo_birthday_md', true );
			if ( '' === $existing ) {
				$existing = (string) get_user_meta( $user_id, '_automatewoo_birthday_md', true );
			}
			if ( '' !== $existing ) {
				return;
			}

			
			$day   = isset( $_POST['aieo_birthday_day'] ) ? absint( wp_unslash( $_POST['aieo_birthday_day'] ) ) : 0;     
			$month = isset( $_POST['aieo_birthday_month'] ) ? absint( wp_unslash( $_POST['aieo_birthday_month'] ) ) : 0; 
			$year  = isset( $_POST['aieo_birthday_year'] ) ? absint( wp_unslash( $_POST['aieo_birthday_year'] ) ) : 0;   

			if ( 0 === $day && 0 === $month && 0 === $year ) {
				return; 
			}

			$md = self::mk_md( $month, $day );
			if ( '' === $md ) {
				if ( is_a( $errors, 'WP_Error' ) ) {
					$errors->add( 'aieo_birthday_invalid', __( 'Please choose a valid birthday (day and month).', 'ai-eshop-optimizer' ) );
				}
				return;
			}

			update_user_meta( $user_id, 'aieo_birthday_md', $md );
			update_user_meta( $user_id, '_automatewoo_birthday_md', $md );

			if ( $year > 0 ) {
				list( $mo, $da ) = explode( '-', $md );
				if ( checkdate( (int) $mo, (int) $da, $year ) ) {
					$full = sprintf( '%04d-%s', $year, $md );
					update_user_meta( $user_id, 'aieo_birthday_full', $full );
					update_user_meta( $user_id, '_automatewoo_birthday_full', $full );
				}
			}
		}

		
		public function suppress_aw_birthdays_account_field() {
			if ( ! class_exists( 'AutomateWoo\\Birthdays\\Frontend' ) ) {
				return;
			}
			remove_action( 'woocommerce_edit_account_form', array( 'AutomateWoo\\Birthdays\\Frontend', 'add_birthday_field_to_edit_account_form' ) );
			remove_action( 'woocommerce_save_account_details_errors', array( 'AutomateWoo\\Birthdays\\Frontend', 'save_account_details_form' ) );
		}

		
		public static function parse_md( $raw ) {
			$raw = trim( (string) $raw );
			
			if ( preg_match( '#^(\d{4})[/.\-](\d{1,2})[/.\-](\d{1,2})$#', $raw, $m ) ) {
				return self::mk_md( (int) $m[2], (int) $m[3] );
			}
			
			if ( preg_match( '#^(\d{1,2})[/.\-](\d{1,2})[/.\-]\d{2,4}$#', $raw, $m ) ) {
				return self::resolve_dm( (int) $m[1], (int) $m[2] );
			}
			
			if ( preg_match( '#^(\d{1,2})[/.\-](\d{1,2})$#', $raw, $m ) ) {
				return self::resolve_dm( (int) $m[1], (int) $m[2] );
			}
			return '';
		}

		
		public static function parse_full( $raw ) {
			$raw = trim( (string) $raw );
			
			if ( preg_match( '#^(\d{4})[/.\-](\d{1,2})[/.\-](\d{1,2})$#', $raw, $m ) ) {
				return checkdate( (int) $m[2], (int) $m[3], (int) $m[1] ) ? sprintf( '%04d-%02d-%02d', $m[1], $m[2], $m[3] ) : '';
			}
			
			if ( preg_match( '#^(\d{1,2})[/.\-](\d{1,2})[/.\-](\d{4})$#', $raw, $m ) ) {
				$md = self::resolve_dm( (int) $m[1], (int) $m[2] );
				if ( '' !== $md ) {
					list( $mo, $da ) = explode( '-', $md );
					if ( checkdate( (int) $mo, (int) $da, (int) $m[3] ) ) {
						return sprintf( '%04d-%s', $m[3], $md );
					}
				}
			}
			return '';
		}

		
		private static function resolve_dm( $a, $b ) {
			if ( $a > 12 && $b <= 12 ) {
				return self::mk_md( $b, $a ); 
			}
			if ( $b > 12 && $a <= 12 ) {
				return self::mk_md( $a, $b ); 
			}
			return self::mk_md( $b, $a ); 
		}

		private static function mk_md( $month, $day ) {
			$month = (int) $month;
			$day   = (int) $day;
			
			
			
			if ( ! checkdate( $month, $day, 2024 ) ) {
				return '';
			}
			return sprintf( '%02d-%02d', $month, $day );
		}

		private function get_settings() {
			$stored = get_option( self::OPTION_KEY, array() );
			if ( ! is_array( $stored ) ) {
				$stored = array();
			}
			return self::fill_i18n_defaults( array_merge( array(
				'enabled' => 'no',
				
				'label'        => '',
				'message'      => '',
				'message_bg'   => '#fff6e5',
				'message_text' => '#5b4400',
			), $stored ) );
		}

		
		private static function fill_i18n_defaults( array $s ) {
			if ( ! did_action( 'init' ) ) { return $s; }
			$i18n = array(
				'label'   => __( 'Birthday (DD/MM)', 'ai-eshop-optimizer' ),
				'message' => __( 'Fill in your birthday to receive your birthday gift from our store! 🎁', 'ai-eshop-optimizer' ),
			);
			foreach ( $i18n as $k => $v ) {
				if ( ! isset( $s[ $k ] ) || '' === trim( (string) $s[ $k ] ) ) { $s[ $k ] = $v; }
			}
			return $s;
		}
	}
}