<?php
/**
 * Minify module.
 *
 * Owns the minify_html / minify_css / minify_js settings. Engine work
 * still happens in XSpeed\Minifier (filters style_loader_src and
 * script_loader_src), but the Module is now the storage and editing
 * authority. Settings live in xspeed_module_minify; the legacy
 * xspeed_options blob is drained on first boot and on POST.
 *
 * Tier: Free. See SETTINGS.md for the contract this module satisfies.
 *
 * @package XSpeed
 */

declare(strict_types=1);

namespace XSpeed\Modules\Minify;

use XSpeed\Minifier as LegacyMinifier;
use XSpeed\Module;
use XSpeed\Settings_Manager;

final class MinifyModule extends Module {

	public const SLUG    = 'minify';
	public const TIER    = self::TIER_FREE;
	public const VERSION = '1.2.0';

	public function ui_metadata(): array {
		return array(
			'label'       => 'Minify',
			'icon'        => 'Wand2',
			'description' => 'Strip whitespace and rewrite enqueued CSS / JS.',
		);
	}

	public function settings_schema(): array {
		return array(
			'minify_html' => array(
				'type'        => 'bool',
				'default'     => false,
				'label'       => 'Minify HTML',
				'description' => 'Strip whitespace and comments from HTML output. Safe on most themes.',
			),
			'minify_css'  => array(
				'type'        => 'bool',
				'default'     => false,
				'label'       => 'Minify CSS',
				'description' => 'Compress and rewrite enqueued local stylesheets. External CSS is left untouched.',
			),
			'minify_js'   => array(
				'type'        => 'bool',
				'default'     => false,
				'label'       => 'Minify JavaScript',
				'description' => 'Compress enqueued local scripts. Disable if you hit script-loading conflicts on the frontend.',
			),
			'defer_js' => array(
				'type'        => 'bool',
				'default'     => false,
				'label'       => 'Defer JavaScript',
				'description' => 'Add defer="defer" to enqueued script tags so they execute after HTML parsing. jQuery + its hard dependencies are skipped automatically.',
			),
			'delay_js' => array(
				'type'        => 'bool',
				'default'     => false,
				'label'       => 'Delay JavaScript Until Interaction',
				'description' => 'Postpone script loading until the visitor scrolls, moves the mouse, taps, or presses a key. Drastically improves first paint on script-heavy pages; can break above-the-fold scripted UI — test before leaving on.',
			),
			'async_css' => array(
				'type'        => 'bool',
				'default'     => false,
				'label'       => 'Load CSS Asynchronously',
				'description' => 'Rewrite stylesheet link tags to load non-blocking via the print-then-all pattern. Pairs well with critical-CSS workflows; can cause a flash of unstyled content if the theme has no critical CSS.',
			),
			'remove_query_strings' => array(
				'type'        => 'bool',
				'default'     => false,
				'label'       => 'Remove Asset Query Strings',
				'description' => 'Strip ?ver=X.Y from enqueued CSS / JS URLs. Some CDN caches and proxies cache better when query strings are absent.',
			),
			'defer_js_excluded' => array(
				'type'        => 'list',
				'default'     => array( 'jquery-core', 'jquery-migrate' ),
				'item_type'   => 'string',
				'label'       => 'Defer / Delay Exclusions',
				'description' => 'Script handles OR URL substrings that skip defer + delay. Defaults exclude jQuery (most themes depend on it being available synchronously). One per line.',
			),
			'combine_css' => array(
				'type'        => 'bool',
				'default'     => false,
				'label'       => 'Combine CSS Files',
				'description' => 'Concatenate enqueued local stylesheets into a single file (with @import and url(…) paths resolved). External CSS is left alone. Pairs poorly with HTTP/2 push — only enable on HTTP/1.1 hosts.',
			),
			'combine_js' => array(
				'type'        => 'bool',
				'default'     => false,
				'label'       => 'Combine JavaScript Files',
				'description' => 'Concatenate enqueued local scripts into a single file. External scripts + scripts marked async / deferred are left alone. Disable if you hit dependency-order issues; the combiner respects WordPress enqueue order but inline scripts attached via wp_add_inline_script can shift behavior.',
			),
		);
	}

	/**
	 * 1.1.0: drain minify_html / minify_css / minify_js from the legacy
	 * `xspeed_options` blob into this module's per-module option, then
	 * delete the keys from the legacy blob so duplicate sources can't
	 * re-appear. Idempotent — re-running is a no-op once the keys are
	 * gone from xspeed_options.
	 */
	public function migrations(): array {
		return array(
			'1.1.0' => static function ( array $opts ): array {
				$legacy = get_option( 'xspeed_options', array() );
				if ( ! is_array( $legacy ) ) {
					return $opts;
				}
				$dirty = false;
				foreach ( array( 'minify_html', 'minify_css', 'minify_js' ) as $key ) {
					if ( array_key_exists( $key, $legacy ) ) {
						$opts[ $key ] = (bool) $legacy[ $key ];
						unset( $legacy[ $key ] );
						$dirty       = true;
					}
				}
				if ( $dirty ) {
					update_option( 'xspeed_options', $legacy );
				}
				return $opts;
			},
		);
	}

	/**
	 * Conflict declarations. Detected automatically by Conflict_Registry,
	 * but listing them here keeps the module self-documenting.
	 */
	public function conflicts(): array {
		return array(
			array(
				'plugin'   => 'autoptimize/autoptimize.php',
				'feature'  => 'minify.html',
				'strategy' => \XSpeed\Conflict_Registry::STRATEGY_REFUSE,
				'reason'   => 'Autoptimize is active and handles minification.',
			),
			array(
				'plugin'   => 'wp-rocket/wp-rocket.php',
				'feature'  => 'minify.html',
				'strategy' => \XSpeed\Conflict_Registry::STRATEGY_REFUSE,
				'reason'   => 'WP Rocket already handles minification.',
			),
		);
	}

	public function cli_commands(): array {
		return array(
			array(
				'name'      => 'xspeed minify',
				'callback'  => array( $this, 'cli_handler' ),
				'shortdesc' => 'Inspect or purge xSpeed minify cache.',
				'synopsis'  => array(
					array(
						'type'     => 'positional',
						'name'     => 'action',
						'options'  => array( 'status', 'purge' ),
						'optional' => false,
					),
				),
			),
		);
	}

	/**
	 * On boot:
	 *   1. Seed our per-module option from the legacy blob if neither
	 *      our option nor the migration has run yet (covers the
	 *      already-installed-before-this-module-shipped path).
	 *   2. Instantiate the v1 Minifier engine; it now reads from
	 *      Settings_Manager::get('minify') via its updated read path.
	 */
	public function boot(): void {
		$this->seed_from_legacy_if_needed();
		new LegacyMinifier();
	}

	public function activate(): void {
		// Plugin activation hits all modules. Same seed logic — safe to
		// run more than once.
		$this->seed_from_legacy_if_needed();
	}

	private function seed_from_legacy_if_needed(): void {
		$existing = get_option( 'xspeed_module_minify', null );
		if ( null !== $existing ) {
			return;
		}
		$legacy = get_option( 'xspeed_options', array() );
		if ( ! is_array( $legacy ) ) {
			return;
		}
		$seed   = array( '_version' => self::VERSION );
		$dirty  = false;
		foreach ( array( 'minify_html', 'minify_css', 'minify_js' ) as $key ) {
			if ( array_key_exists( $key, $legacy ) ) {
				$seed[ $key ] = (bool) $legacy[ $key ];
				unset( $legacy[ $key ] );
				$dirty        = true;
			}
		}
		if ( $dirty ) {
			update_option( 'xspeed_module_minify', $seed );
			update_option( 'xspeed_options', $legacy );
		}
	}

	public function cli_handler( array $args, array $assoc ): void {
		$action = $args[0] ?? 'status';

		if ( 'status' === $action ) {
			$opts = Settings_Manager::get( self::SLUG );
			\WP_CLI::log( sprintf( 'minify_html: %s', $opts['minify_html'] ? 'on' : 'off' ) );
			\WP_CLI::log( sprintf( 'minify_css : %s', $opts['minify_css'] ? 'on' : 'off' ) );
			\WP_CLI::log( sprintf( 'minify_js  : %s', $opts['minify_js'] ? 'on' : 'off' ) );
			return;
		}

		if ( 'purge' === $action ) {
			LegacyMinifier::purge_minified();
			\WP_CLI::success( 'Minify cache purged.' );
			return;
		}

		\WP_CLI::error( "Unknown action: $action" );
	}
}