<?php
namespace Admirly\Wp;

use Admirly\Plugin;

/**
 * Front-end CSS/JS. Loaded only when a shortcode/block renders.
 */
final class Assets {
	private static bool $needed = false;

	public function register(): void {
		add_action( 'wp_enqueue_scripts', [ $this, 'registerAssets' ] );
		add_action( 'wp_footer', [ $this, 'enqueueIfNeeded' ], 1 );
	}

	public static function need(): void {
		self::$needed = true;
		// If called while content renders, enqueue right away (printed in the footer).
		if ( did_action( 'wp_enqueue_scripts' ) ) {
			self::enqueue();
		}
	}

	public function registerAssets(): void {
		wp_register_style( 'admirly', ADMIRLY_URL . 'assets/css/admirly.css', [], ADMIRLY_VERSION );
		wp_register_style( 'admirly-rtl', ADMIRLY_URL . 'assets/css/admirly-rtl.css', [ 'admirly' ], ADMIRLY_VERSION );
		wp_register_script(
			'admirly',
			ADMIRLY_URL . 'assets/js/admirly.js',
			[],
			ADMIRLY_VERSION,
			[
				'strategy'  => 'defer',
				'in_footer' => true,
			]
		);
		$color = (string) Plugin::opt( 'color' );
		if ( preg_match( '/^#[0-9a-fA-F]{6}$/', $color ) ) {
			wp_add_inline_style( 'admirly', ':root{--admirly-color:' . $color . ';--admirly-dark:' . self::mix( $color, '#000000', 0.28 ) . ';--admirly-light:' . self::mix( $color, '#ffffff', 0.9 ) . ';--admirly-line:' . self::mix( $color, '#e6e6e6', 0.82 ) . '}' );
		}
	}

	public function enqueueIfNeeded(): void {
		if ( self::$needed ) {
			self::enqueue();
		}
	}

	/** Mixes $hex with $with by $ratio (0 = hex, 1 = with). */
	public static function mix( string $hex, string $with, float $ratio ): string {
		$h = sscanf( ltrim( $hex, '#' ), '%02x%02x%02x' );
		$w = sscanf( ltrim( $with, '#' ), '%02x%02x%02x' );
		if ( ! $h || ! $w ) {
			return $hex;
		}
		$out = '#';
		for ( $i = 0; $i < 3; $i++ ) {
			$out .= str_pad( dechex( (int) round( $h[ $i ] * ( 1 - $ratio ) + $w[ $i ] * $ratio ) ), 2, '0', STR_PAD_LEFT );
		}
		return $out;
	}

	private static function enqueue(): void {
		wp_enqueue_style( 'admirly' );
		if ( is_rtl() ) {
			wp_enqueue_style( 'admirly-rtl' );
		}
		wp_enqueue_script( 'admirly' );
		/** Fires once the plugin's front-end assets are enqueued; extensions enqueue theirs here. */
		do_action( 'admirly_enqueue_assets' );
	}
}