<?php
/**
 * Enqueues the React admin application and its dependencies.
 *
 * @package ProfitEngine
 */

declare( strict_types=1 );

namespace ProfitEngine\Admin;

use ProfitEngine\Support\Capabilities;

defined( 'ABSPATH' ) || exit;

/**
 * Loads the compiled admin bundle produced by @wordpress/scripts.
 *
 * If the build has not been generated yet, a helpful notice is rendered instead
 * of a blank screen so the plugin remains usable in a fresh dev checkout.
 */
class AssetLoader {

	private const HANDLE = 'profit-engine-admin';

	/**
	 * Enqueue scripts, styles, and bootstrap data for the app.
	 */
	public function enqueue(): void {
		$build_dir = PROFIT_ENGINE_PLUGIN_DIR . 'build/';
		$build_url = PROFIT_ENGINE_PLUGIN_URL . 'build/';
		$asset     = $build_dir . 'admin.asset.php';

		if ( ! is_readable( $asset ) ) {
			add_action( 'admin_notices', array( $this, 'render_build_missing_notice' ) );
			return;
		}

		$meta = require $asset;

		// Needed for the media-library picker (e.g. the purchase-order logo).
		if ( function_exists( 'wp_enqueue_media' ) ) {
			wp_enqueue_media();
		}

		wp_enqueue_script(
			self::HANDLE,
			$build_url . 'admin.js',
			$meta['dependencies'] ?? array(),
			$meta['version'] ?? PROFIT_ENGINE_VERSION,
			true
		);

		// @wordpress/scripts emits two stylesheets for this entry: `admin.css`
		// (the Tailwind layer, from the imported .css) and `style-admin.css`
		// (our SCSS). RTL variants are swapped in for RTL locales. Tailwind loads
		// first so our component SCSS can layer on top where needed.
		$rtl      = is_rtl() ? '-rtl' : '';
		$version  = $meta['version'] ?? PROFIT_ENGINE_VERSION;
		$tailwind = "admin{$rtl}.css";
		$styles   = "style-admin{$rtl}.css";

		if ( is_readable( $build_dir . $tailwind ) ) {
			wp_enqueue_style(
				self::HANDLE . '-tw',
				$build_url . $tailwind,
				array( 'wp-components' ),
				$version
			);
		}

		if ( is_readable( $build_dir . $styles ) ) {
			wp_enqueue_style(
				self::HANDLE,
				$build_url . $styles,
				array( 'wp-components', self::HANDLE . '-tw' ),
				$version
			);
		}

		wp_set_script_translations( self::HANDLE, 'profit-engine' );

		wp_add_inline_script(
			self::HANDLE,
			'window.PROFIT_ENGINE_BOOT = ' . wp_json_encode( $this->boot_data() ) . ';',
			'before'
		);
	}

	/**
	 * Data handed to the React app on load.
	 *
	 * @return array<string,mixed>
	 */
	private function boot_data(): array {
		return array(
			'restRoot'      => esc_url_raw( rest_url( 'profit-engine/v1' ) ),
			'restNonce'     => wp_create_nonce( 'wp_rest' ),
			'adminUrl'      => esc_url_raw( admin_url( 'admin.php?page=profit-engine-dashboard' ) ),
			'printBase'     => esc_url_raw( admin_url( 'admin-post.php' ) ),
			'printNonce'    => wp_create_nonce( 'profit_engine_print_po' ),
			'currency'      => array(
				'code'     => function_exists( 'get_woocommerce_currency' ) ? get_woocommerce_currency() : 'USD',
				'symbol'   => function_exists( 'get_woocommerce_currency_symbol' ) ? html_entity_decode( get_woocommerce_currency_symbol() ) : '$',
				'decimals' => function_exists( 'wc_get_price_decimals' ) ? wc_get_price_decimals() : 2,
				// Match the store's own price format (WooCommerce → Settings → Currency options).
				'position' => (string) get_option( 'woocommerce_currency_pos', 'left' ),
				'thousand' => function_exists( 'wc_get_price_thousand_separator' ) ? wc_get_price_thousand_separator() : ',',
				'decimal'  => function_exists( 'wc_get_price_decimal_separator' ) ? wc_get_price_decimal_separator() : '.',
			),
			'currencies'    => $this->currency_options(),
			'orderStatuses' => $this->order_status_options(),
			'logoUrl'       => esc_url_raw( PROFIT_ENGINE_PLUGIN_URL . 'assets/images/profitengine-logo.svg?ver=' . PROFIT_ENGINE_VERSION ),
			'canManage'     => Capabilities::current_user_can(),
			'version'       => PROFIT_ENGINE_VERSION,
		);
	}

	/**
	 * WooCommerce order statuses as [{ slug, label }] (wc- prefix stripped).
	 *
	 * @return array<int,array{slug:string,label:string}>
	 */
	private function order_status_options(): array {
		if ( ! function_exists( 'wc_get_order_statuses' ) ) {
			return array();
		}

		$options = array();
		foreach ( wc_get_order_statuses() as $slug => $label ) {
			$options[] = array(
				'slug'  => (string) preg_replace( '/^wc-/', '', (string) $slug ),
				'label' => (string) $label,
			);
		}
		return $options;
	}

	/**
	 * WooCommerce's currency list as [{ code, label }] for select controls.
	 *
	 * @return array<int,array{code:string,label:string}>
	 */
	private function currency_options(): array {
		if ( ! function_exists( 'get_woocommerce_currencies' ) ) {
			return array(
				array(
					'code'  => 'USD',
					'label' => 'USD — US Dollar',
				),
			);
		}

		$options = array();
		foreach ( get_woocommerce_currencies() as $code => $name ) {
			$symbol    = html_entity_decode( get_woocommerce_currency_symbol( $code ) );
			$options[] = array(
				'code'  => $code,
				'label' => sprintf( '%s — %s (%s)', $code, $name, $symbol ),
			);
		}
		return $options;
	}

	/**
	 * Notice shown when the JS bundle has not been built.
	 */
	public function render_build_missing_notice(): void {
		echo '<div class="notice notice-warning"><p>';
		echo '<strong>' . esc_html__( 'ProfitEngine', 'profit-engine' ) . '</strong> — ';
		echo esc_html__( 'The admin interface has not been built yet. Run "npm install && npm run build" in the plugin directory.', 'profit-engine' );
		echo '</p></div>';
	}
}