<?php
/**
 * Includes -> Responsive breakpoints CSS -> Helpers
 *
 */
if ( ! defined( 'ABSPATH' ) ) exit;


function tbkkt_responsive_breakpoints_css_get_module_path(): string {
	return trailingslashit( dirname( __FILE__ ) );
}


/**
 * Absolute directory under uploads where generated breakpoint CSS is stored (no trailing slash)
 */
function tbkkt_responsive_breakpoints_css_get_generated_base_path(): string {
	if ( ! defined( 'TBKKT_GENERATED_CSS_UPLOADS_DIRNAME' ) ) return '';

	$upload = wp_upload_dir( null, false );
	if ( ! empty( $upload['error'] ) || empty( $upload['basedir'] ) ) :
		return '';
	endif;

	return trailingslashit( $upload['basedir'] ) . TBKKT_GENERATED_CSS_UPLOADS_DIRNAME;
}


/**
 * Public URL directory for generated CSS (no trailing slash)
 */
function tbkkt_responsive_breakpoints_css_get_generated_base_url(): string {
	if ( ! defined( 'TBKKT_GENERATED_CSS_UPLOADS_DIRNAME' ) ) return '';

	$upload = wp_upload_dir( null, false );
	if ( ! empty( $upload['error'] ) || empty( $upload['baseurl'] ) ) :
		return '';
	endif;

	return trailingslashit( $upload['baseurl'] ) . TBKKT_GENERATED_CSS_UPLOADS_DIRNAME;
}


function tbkkt_responsive_breakpoints_css_is_custom_breakpoints_enabled(): bool {
	if ( ! function_exists( 'tbkkt_settings_get' ) ) return false;

	$key = tbkkt_responsive_breakpoints_css_get_option_key();
	$all = tbkkt_settings_get();
	return ! empty( $all[ $key ] ) && is_array( $all[ $key ] )
		&& ! empty( $all[ $key ]['enabled'] );
}


/**
 * URL and version for wp_register_style: uploads copy when custom breakpoints are on and the file exists; else bundled plugin asset
 */
function tbkkt_responsive_breakpoints_css_get_resolved_style_registration( string $basename ): array {
	$basename = trim( $basename );
	if ( $basename === '' ) :
		$basename = 'style.css';
	endif;

	// Find source path in manifest
	$manifest = tbkkt_responsive_breakpoints_css_get_generated_file_pairs();
	$source_relative = '';
	foreach ( $manifest as $pair ) :
		if ( isset( $pair['output_name'] ) && $pair['output_name'] === $basename ) :
			$source_relative = isset( $pair['source'] ) ? $pair['source'] : '';
			break;
		endif;
	endforeach;

	// Fallback: assume assets/css/{basename} if not in manifest
	if ( $source_relative === '' ) :
		$source_relative = 'assets/css/' . basename( $basename );
	endif;

	$plugin_path = TBKKT_PLUGIN_PATH . $source_relative;
	$plugin_url  = TBKKT_PLUGIN_URL . $source_relative;
	$version     = file_exists( $plugin_path )
		? (int) filemtime( $plugin_path )
		: (int) TBKKT_PLUGIN_VERSION;

	if ( ! tbkkt_responsive_breakpoints_css_is_custom_breakpoints_enabled() ) :
		return array(
			'url'     => $plugin_url,
			'version' => $version,
		);
	endif;

	$dir = tbkkt_responsive_breakpoints_css_get_generated_base_path();
	if ( $dir === '' ) :
		return array(
			'url'     => $plugin_url,
			'version' => $version,
		);
	endif;

	$gen_path = $dir . '/' . $basename;
	if ( is_readable( $gen_path ) ) :
		return array(
			'url'     => trailingslashit( tbkkt_responsive_breakpoints_css_get_generated_base_url() ) . $basename,
			'version' => (int) filemtime( $gen_path ),
		);
	endif;

	return array(
		'url'     => $plugin_url,
		'version' => $version,
	);
}


/**
 * WordPress filesystem API for generated uploads cleanup
 */
function tbkkt_responsive_breakpoints_css_get_filesystem() {
	global $wp_filesystem;
	if ( ! empty( $wp_filesystem ) ) return $wp_filesystem;

	if ( ! function_exists( 'WP_Filesystem' ) ) :
		require_once ABSPATH . 'wp-admin/includes/file.php';
	endif;

	WP_Filesystem();

	if ( empty( $wp_filesystem ) ) :
		return null;
	endif;

	return $wp_filesystem;
}


function tbkkt_responsive_breakpoints_css_remove_directory( string $path ): bool {
	$filesystem = tbkkt_responsive_breakpoints_css_get_filesystem();
	if ( null === $filesystem ) return false;

	return $filesystem->rmdir( $path, false );
}


/**
 * Remove generated CSS files from uploads; if the directory is empty or only contains index.php, remove those too
 */
function tbkkt_responsive_breakpoints_css_delete_generated_uploads(): void {
	$dir = tbkkt_responsive_breakpoints_css_get_generated_base_path();
	if ( $dir === '' || ! is_dir( $dir ) ) return;

	$upload = wp_upload_dir( null, false );
	if ( ! empty( $upload['error'] ) || empty( $upload['basedir'] ) ) return;

	$basedir_real = realpath( $upload['basedir'] );
	$dir_real     = realpath( $dir );
	if ( false === $basedir_real || false === $dir_real ) return;
	if ( strpos( $dir_real, $basedir_real ) !== 0 ) return;

	// Delete each file from manifest
	$manifest = tbkkt_responsive_breakpoints_css_get_generated_file_pairs();
	foreach ( $manifest as $pair ) :
		if ( ! isset( $pair['output_name'] ) ) continue;
		$name = $pair['output_name'];
		$file = $dir . '/' . $name;

		if ( is_file( $file ) && is_readable( $file ) ) :
			wp_delete_file( $file );
		endif;
	endforeach;

	// Remove empty subdirectories
	$subdirs = array( 'container', 'icon' );
	foreach ( $subdirs as $subdir ) :
		$subdir_path = $dir . '/' . $subdir;
		if ( is_dir( $subdir_path ) ) :
			$items = scandir( $subdir_path, SCANDIR_SORT_NONE );
			if ( false !== $items ) :
				$names = array_values( array_diff( $items, array( '.', '..' ) ) );
				if ( empty( $names ) ) :
					tbkkt_responsive_breakpoints_css_remove_directory( $subdir_path );
				endif;
			endif;
		endif;
	endforeach;

	// Check if base directory is empty or only has index.php
	$items = scandir( $dir, SCANDIR_SORT_NONE );
	if ( false === $items ) return;

	$names = array_values( array_diff( $items, array( '.', '..' ) ) );
	sort( $names, SORT_STRING );

	if ( $names === array() ) :
		if ( ! tbkkt_responsive_breakpoints_css_remove_directory( $dir ) ) :
			tbkkt_plugin_log_error( 'tms-block-kit: could not remove empty generated CSS directory under uploads.' );
		endif;
		return;
	endif;

	if ( $names === array( 'index.php' ) ) :
		$index = $dir . '/index.php';
		if ( is_file( $index ) ) :
			wp_delete_file( $index );
		endif;
		if ( ! tbkkt_responsive_breakpoints_css_remove_directory( $dir ) ) :
			tbkkt_plugin_log_error( 'tms-block-kit: could not remove generated CSS directory under uploads after removing index.php.' );
		endif;
	endif;
}


/**
 * Prevent directory listing in uploads subfolder (best-effort)
 */
function tbkkt_responsive_breakpoints_css_write_uploads_index_if_missing(): void {
	$dir = tbkkt_responsive_breakpoints_css_get_generated_base_path();
	if ( $dir === '' || ! is_dir( $dir ) ) return;

	$index = trailingslashit( $dir ) . 'index.php';
	if ( file_exists( $index ) ) return;

	$file_put = file_put_contents(
		$index,
		'<?php if ( ! defined( \'ABSPATH\' ) ) exit;',
		LOCK_EX
	);
	if ( false === $file_put ) :
		tbkkt_plugin_log_error( 'tms-block-kit: could not write uploads index.php in generated CSS directory.' );
	endif;
}