<?php
// PHP 7.4 compatible. No Composer. No build step. WordPress coding standards.
// F1-A: Auto-seed global regions from gs_*.php schemas on theme activation.

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

class SLBUILD_ThemeSetup {

	/**
	 * Called on after_switch_theme. Scans the active theme's sections/ folder for
	 * gs_*.php files and seeds each global region if it has no saved data yet.
	 * Idempotent — skips regions that already have a non-empty layout.
	 */
	public static function seed_globals(): void {
		$sections_dir = get_stylesheet_directory() . '/sections';
		if ( ! is_dir( $sections_dir ) ) {
			return;
		}

		$files = glob( $sections_dir . '/gs_*.php' );
		if ( ! $files ) {
			return;
		}

		$parser = new SLBUILD_SchemaParser();
		$store  = new SLBUILD_DataStore();

		foreach ( $files as $file ) {
			$slug = basename( $file, '.php' );

			// Derive region name: gs_header ? header, gs_theme-settings ? theme-settings
			$region = substr( $slug, 3 ); // strip 'gs_'

			// Skip if region already has saved data.
			$existing = $store->get_global( $region );
			if ( ! empty( $existing['layout'] ) ) {
				continue;
			}

			$schema = $parser->parse_file( $file );
			if ( null === $schema ) {
				continue;
			}

			// Build defaults from schema settings.
			$settings = array();
			foreach ( $schema['settings'] ?? array() as $field ) {
				if ( ! empty( $field['id'] ) && isset( $field['default'] ) && '' !== $field['default'] ) {
					$settings[ $field['id'] ] = $field['default'];
				}
			}

			// Build default blocks if declared.
			$blocks = array();
			foreach ( $schema['default_blocks'] ?? array() as $def_block ) {
				$blocks[] = array(
					'block'    => 'b_' . wp_generate_uuid4(),
					'type'     => $def_block['type'],
					'settings' => $def_block['settings'] ?? array(),
				);
			}

			$instance_id = $slug . '_x1';
			$layout      = array( array( 'instance' => $instance_id, 'type' => $slug ) );
			$instances   = array( $instance_id => array( 'settings' => $settings, 'blocks' => $blocks ) );

			$store->save_global( $region, $layout, $instances );
		}
	}
}