<?php

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

final class AIEO_Content_Layout {

	
	const BLOCKS = array( 'card', 'plan', 'table', 'action', 'list', 'media', 'mark', 'questions' );

	
	const PATTERN_FIELDS = array( 'pattern', 'column', 'fields', 'submit', 'consent', 'scores', 'todo' );

	
	const ALIAS_TARGETS = array( 'heading', 'head', 'eyebrow', 'badge', 'notice', 'body' );

	
	const SPLIT = '#^(\d+(?:\.\d+)?)(fr|%)?/(\d+(?:\.\d+)?)(fr|%)?$#';

	
	public static function applies( array $s ) {
		return isset( $s['blocks'] ) && is_array( $s['blocks'] );
	}

	
	public static function head_only( array $s ) {
		return self::applies( $s ) && ! array_filter( $s['blocks'], 'is_array' );
	}

	
	public static function render( array $s ) {
		$kind          = (string) ( $s['kind'] ?? 'cards' );
		$s['_aliases'] = self::aliases( $s );
		$layout        = static fn ( $head ) => self::body( $s, (string) $head );
		switch ( (string) ( $s['_display'] ?? '' ) ) {
			case AIEO_Content_Promo::NAME:
				return AIEO_Content_Promo::section( $s, $kind, $layout );
			case AIEO_Content_Rooster_One::NAME:
				return AIEO_Content_Rooster_One::section( $s, $kind, $layout );
		}
		return AIEO_Content_Sections::section( $s, $kind, $layout );
	}

	
	public static function place( array $s, $head, callable $layout ) {
		if ( '' !== (string) $head && self::head_column( $s ) ) {
			return (string) $layout( $head );
		}
		return (string) $head . (string) $layout( '' );
	}

	
	public static function head_column( array $s ) {
		$column = (int) ( $s['head_column'] ?? 0 );
		$count  = self::count( $s['columns'] ?? 1 );
		return $column >= 1 && $count > 1 && $column <= $count && ! self::head_only( $s ) ? $column : 0;
	}

	
	public static function count( $columns ) {
		return self::split( $columns ) ? 2 : max( 1, min( 4, (int) $columns ) );
	}

	
	public static function alias_targets( array $s ) {
		$drawn   = empty( $s['headless'] );
		$present = array(
			'heading' => $drawn && '' !== trim( (string) ( $s['heading'] ?? '' ) ),
			'head'    => $drawn && ( '' !== trim( (string) ( $s['heading'] ?? '' ) ) || ! empty( $s['eyebrow'] ) || ! empty( $s['lede'] ) || ! empty( $s['icon'] ) || ! empty( $s['badge'] ) || ! empty( $s['notice'] ) ),
			'eyebrow' => $drawn && ! empty( $s['eyebrow'] ),
			'badge'   => $drawn && ! empty( $s['badge'] ),
			'notice'  => $drawn && ! empty( $s['notice'] ),
			'body'    => ! self::head_only( $s ),
		);
		return array_values( array_filter( self::ALIAS_TARGETS, static fn ( $t ) => $present[ $t ] ) );
	}

	
	public static function aliases( array $s ) {
		$ids     = self::alias_ids( $s );
		$targets = self::alias_targets( $s );
		$n       = min( count( $ids ), count( $targets ) );
		return $n ? array_combine( array_slice( $targets, 0, $n ), array_slice( $ids, 0, $n ) ) : array();
	}

	
	public static function alias_ids( array $s ) {
		$own = array( AIEO_Content_Sections::anchor( $s + array( 'key' => '' ) ) );
		foreach ( is_array( $s['blocks'] ?? null ) ? $s['blocks'] : array() as $item ) {
			if ( is_array( $item ) && is_string( $item['anchor'] ?? null ) ) {
				$own[] = sanitize_title( $item['anchor'] );
			}
			if ( is_array( $item ) ) {
				$own = array_merge( $own, self::card_anchors( $item ) );
			}
		}
		$ids = array_map( static fn ( $a ) => sanitize_title( (string) $a ), (array) ( $s['aliases'] ?? array() ) );
		return array_values( array_unique( array_filter( $ids, static fn ( $id ) => '' !== $id && ! in_array( $id, $own, true ) ) ) );
	}

	
	public static function card_anchors( array $item ) {
		if ( 'card' !== (string) ( $item['block'] ?? '' ) || 'grid' !== (string) ( $item['variant'] ?? '' ) ) {
			return array();
		}
		$lines = is_array( $item['items'] ?? null ) ? array_map( 'strval', $item['items'] ) : preg_split( '/\r\n|\r|\n/', (string) ( $item['items'] ?? '' ) );
		$out   = array();
		foreach ( (array) $lines as $line ) {
			foreach ( array_slice( explode( '|', (string) $line ), 2 ) as $cell ) {
				if ( preg_match( '/^anchor:([a-z0-9][a-z0-9_-]*)$/', trim( $cell ), $m ) ) {
					$out[] = $m[1];
				}
			}
		}
		return $out;
	}

	
	public static function split( $columns ) {
		if ( ! is_string( $columns ) || ! preg_match( self::SPLIT, trim( $columns ), $m ) ) {
			return null;
		}
		$a = (float) $m[1];
		$b = (float) $m[3];
		if ( $a <= 0 || $b <= 0 ) {
			return null;
		}
		$pct = static fn ( $v ) => rtrim( rtrim( number_format( 100 * $v / ( $a + $b ), 4, '.', '' ), '0' ), '.' ) . '%';
		return array( $pct( $a ), $pct( $b ) );
	}

	
	public static function block( array $item, $tone = '' ) {
		$name = sanitize_key( (string) ( $item['block'] ?? '' ) );
		if ( ! in_array( $name, self::BLOCKS, true ) ) {
			return '';
		}
		$attrs = array();
		foreach ( $item as $key => $value ) {
			if ( in_array( $key, array( 'block', 'column' ), true ) ) {
				continue;
			}
			$attrs[ $key ] = is_array( $value ) && array_is_list( $value ) && ! array_filter( $value, 'is_array' ) ? implode( "\n", array_map( 'strval', $value ) ) : $value;
		}
		if ( '' !== (string) $tone && empty( $attrs['tone'] ) ) {
			$attrs['tone'] = (string) $tone;
		}
		
		$type = WP_Block_Type_Registry::get_instance()->get_registered( 'rooster/' . $name );
		foreach ( $attrs as $key => $value ) {
			$schema = (string) ( $type->attributes[ $key ]['type'] ?? '' );
			if ( 'integer' === $schema && is_string( $value ) && is_numeric( $value ) ) {
				$attrs[ $key ] = (int) $value;
			} elseif ( 'string' === $schema && ( is_int( $value ) || is_float( $value ) ) ) {
				$attrs[ $key ] = (string) $value;
			}
		}
		
		if ( isset( $attrs['variant'] ) ) {
			$attrs = array( 'variant' => $attrs['variant'] ) + $attrs;
		}
		return AIEO_Content_Blocks::block( $name, $attrs );
	}

	
	public static function item( array $item, $tone = '' ) {
		if ( ! isset( $item['block'] ) && isset( $item['pattern'] ) ) {
			$slug = trim( (string) $item['pattern'] );
			return '' !== $slug ? AIEO_Content_Blocks::comment( 'core/pattern', array( 'slug' => $slug ) ) : '';
		}
		return self::block( $item, $tone );
	}

	
	private static function body( array $s, $head = '' ) {
		$tone    = sanitize_key( (string) ( $s['tone'] ?? '' ) );
		$items   = array_values( array_filter( (array) ( $s['blocks'] ?? array() ), 'is_array' ) );
		$columns = $s['columns'] ?? 1;
		$split   = self::split( $columns );
		$count   = self::count( $columns );
		$gap     = AIEO_Content_Sections::padding_value( $s['gap'] ?? 5 );
		$gap     = '' !== $gap ? $gap : 'var:preset|spacing|5';
		$cells   = array(); 
		$at      = array(); 
		foreach ( $items as $i => $item ) {
			
			$markup = AIEO_Content_Tabs::is( $item ) ? AIEO_Content_Tabs::compile( $item, $s ) : self::item( $item, $tone );
			if ( '' === $markup ) {
				continue;
			}
			$col = (int) ( $item['column'] ?? 0 );
			if ( $col < 1 || $col > $count ) {
				$col = $split ? ( 0 === $i ? 1 : 2 ) : 0;
			}
			if ( $split ) {
				$cells[ $col ][] = $markup;
			} elseif ( $col ) {
				if ( ! isset( $at[ $col ] ) ) {
					$at[ $col ] = count( $cells );
					$cells[]    = array();
				}
				$cells[ $at[ $col ] ][] = $markup;
			} else {
				$cells[] = array( $markup );
			}
		}
		$in = '' !== (string) $head ? self::head_column( $s ) : 0;
		if ( $in ) {
			
			
			$index           = $split ? $in : ( $at[ $in ] ?? ( isset( $cells[ $in - 1 ] ) ? $in - 1 : count( $cells ) ) );
			$cells[ $index ] = array_merge( array( (string) $head ), $cells[ $index ] ?? array() );
		}
		if ( ! $cells ) {
			return '';
		}
		$attrs = array(
			'metadata'  => array( 'name' => __( 'Blocks', 'ai-eshop-optimizer' ) ),
			'lock'      => array( 'move' => true, 'remove' => true ),
		);
		if ( '' !== AIEO_Content_Sections::alias( $s, 'body' ) ) {
			$attrs['anchor'] = AIEO_Content_Sections::alias( $s, 'body' );
		}
		$attrs += array(
			'align'     => 'wide',
			'className' => 'rooster-section__blocks',
			
			'style'     => array( 'spacing' => array( 'blockGap' => $gap, 'margin' => array( 'top' => $in ? '0' : 'var:preset|spacing|6' ) ) ),
		);
		if ( ! empty( $s['defer'] ) && in_array( (string) ( $s['kind'] ?? '' ), AIEO_Content_Sections::DEFERRABLE, true ) && ! AIEO_Content_Tabs::holds( $s ) ) {
			
			$label                 = AIEO_Content_Inline::heading_plain( (string) ( $s['heading'] ?? '' ) );
			$attrs['roosterDefer'] = array( 'enabled' => true, 'height' => '480px' ) + ( '' !== $label ? array( 'label' => $label ) : array() );
		}
		if ( $split ) {
			$attrs['layout'] = array( 'type' => 'constrained' );
			$columns_html    = AIEO_Content_Sections::columns(
				AIEO_Content_Sections::column( implode( '', $cells[1] ?? array() ), $split[0], 'rooster-section__column', 'center' === (string) ( $s['align'] ?? '' ) ),
				AIEO_Content_Sections::column( implode( '', $cells[2] ?? array() ), $split[1], 'rooster-section__column', 'center' === (string) ( $s['align'] ?? '' ) ),
				array( 'verticalAlignment' => 'center' === (string) ( $s['align'] ?? '' ) ? 'center' : null, 'style' => array( 'spacing' => array( 'blockGap' => array( 'top' => $gap, 'left' => $gap ) ) ) )
			);
			return AIEO_Content_Blocks::group( $attrs, $columns_html );
		}
		$attrs['layout'] = 1 === $count ? array( 'type' => 'flex', 'orientation' => 'vertical', 'flexWrap' => 'nowrap', 'justifyContent' => 'stretch' ) : array( 'type' => 'grid', 'columnCount' => $count, 'minimumColumnWidth' => '16rem' );
		$inner           = '';
		ksort( $cells );
		foreach ( $cells as $cell ) {
			$inner .= 1 === count( $cell ) || 1 === $count
				? implode( '', $cell )
				: AIEO_Content_Blocks::group( array( 'className' => 'rooster-section__cell', 'style' => array( 'spacing' => array( 'blockGap' => $gap ) ), 'layout' => array( 'type' => 'flex', 'orientation' => 'vertical', 'flexWrap' => 'nowrap', 'justifyContent' => 'stretch' ) ), implode( '', $cell ) );
		}
		return AIEO_Content_Blocks::group( $attrs, $inner );
	}
}