<?php
namespace AISP_OTOOLS;

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

class Custom_Item {

	public function __construct() {

		add_action( 'admin_init', [ $this, 'maybe_setup_products' ] );
		add_action( 'update_option_aisp_otools_add_custom_item', [ $this, 'toggle_handler' ], 10, 3 );
		add_action( 'update_option_aisp_otools_custom_item_base_name', [ $this, 'rename_products' ], 10, 3 );
		add_action( 'woocommerce_before_add_to_cart_button', [ $this, 'frontend_fields' ] );
		add_filter( 'woocommerce_add_cart_item_data', [ $this, 'save_to_cart' ], 10, 2 );
		add_action( 'woocommerce_before_calculate_totals', [ $this, 'apply_custom_price' ] );
		add_filter( 'woocommerce_cart_item_name', [ $this, 'change_cart_item_name' ], 10, 3 );
		add_action( 'woocommerce_checkout_create_order_line_item', [ $this, 'add_to_order' ], 10, 4 );
		add_action( 'template_redirect', [ $this, 'block_direct_access' ] );
		add_filter( 'pre_trash_post', [ $this, 'block_trash' ], 10, 2 );
		add_action( 'before_delete_post', [ $this, 'block_delete' ] );
	}

	public function maybe_setup_products() {

		$enabled   = get_option( 'aisp_otools_add_custom_item', 'no' );
		$base_name = get_option(
			'aisp_otools_custom_item_base_name',
			esc_html__( 'Custom Item', 'aisp-order-tools-for-woocommerce' )
		);

		$taxable_id = (int) get_option( 'aisp_otools_custom_item_taxable_id', 0 );
		$notax_id   = (int) get_option( 'aisp_otools_custom_item_notax_id', 0 );

		if ( $enabled !== 'yes' ) {
			return;
		}

		if ( ! $taxable_id || ! get_post_status( $taxable_id ) ) {
			$new_id = $this->create_product( $base_name, true );
			update_option( 'aisp_otools_custom_item_taxable_id', $new_id );
		}

		if ( ! $notax_id || ! get_post_status( $notax_id ) ) {
			$new_id = $this->create_product( $base_name, false );
			update_option( 'aisp_otools_custom_item_notax_id', $new_id );
		}
	}

	public function toggle_handler( $old, $new, $option ) {

		$taxable_id = (int) get_option( 'aisp_otools_custom_item_taxable_id', 0 );
		$notax_id   = (int) get_option( 'aisp_otools_custom_item_notax_id', 0 );

		if ( $new === 'no' ) {

			$GLOBALS['aisp_otools_allow_delete'] = true;

			if ( $taxable_id ) {
				wp_delete_post( $taxable_id, true );
			}
			if ( $notax_id ) {
				wp_delete_post( $notax_id, true );
			}

			delete_option( 'aisp_otools_custom_item_taxable_id' );
			delete_option( 'aisp_otools_custom_item_notax_id' );

			unset( $GLOBALS['aisp_otools_allow_delete'] );

			return;
		}

		if ( $new === 'yes' ) {
			$this->maybe_setup_products();
		}
	}

	public function rename_products( $old, $new, $option ) {

		$taxable_id = (int) get_option( 'aisp_otools_custom_item_taxable_id', 0 );
		$notax_id   = (int) get_option( 'aisp_otools_custom_item_notax_id', 0 );

		if ( $taxable_id && get_post_status( $taxable_id ) ) {
			wp_update_post( [
				'ID'         => $taxable_id,
				'post_title' => sprintf(
					// translators: %s = base name of the custom item.
					esc_html__( '%s (Taxable)', 'aisp-order-tools-for-woocommerce' ),
					esc_html( $new )
				),
			] );
		}

		if ( $notax_id && get_post_status( $notax_id ) ) {
			wp_update_post( [
				'ID'         => $notax_id,
				'post_title' => sprintf(
					// translators: %s = base name of the custom item.
					esc_html__( '%s (No tax)', 'aisp-order-tools-for-woocommerce' ),
					esc_html( $new )
				),
			] );
		}
	}

	private function create_product( $base_name, $is_taxable ) {

		$name = $is_taxable
			? sprintf(
				// translators: %s = base name of the custom item.
				esc_html__( '%s (Taxable)', 'aisp-order-tools-for-woocommerce' ),
				esc_html( $base_name )
			)
			: sprintf(
				// translators: %s = base name of the custom item.
				esc_html__( '%s (No tax)', 'aisp-order-tools-for-woocommerce' ),
				esc_html( $base_name )
			);

		$product_id = wp_insert_post( [
			'post_title'  => $name,
			'post_status' => 'publish',
			'post_type'   => 'product',
		] );

		if ( is_wp_error( $product_id ) ) {
			return 0;
		}

		$product = wc_get_product( $product_id );
		if ( $product ) {
			$product->set_regular_price( 0 );
			$product->set_price( 0 );
			$product->set_virtual( true );
			$product->set_sold_individually( true );
			$product->set_catalog_visibility( 'hidden' );
			$product->set_manage_stock( false );
			$product->set_tax_status( $is_taxable ? 'taxable' : 'none' );
			$product->save();
		}

		return $product_id;
	}

	public function frontend_fields() {
		global $product;

		$taxable_id = (int) get_option( 'aisp_otools_custom_item_taxable_id', 0 );
		$notax_id   = (int) get_option( 'aisp_otools_custom_item_notax_id', 0 );

		if ( ! in_array( $product->get_id(), [ $taxable_id, $notax_id ], true ) ) {
			return;
		}
		?>
		<div class="aisp-custom-item-fields" style="margin:15px 0;">

			<?php wp_nonce_field( 'aisp_custom_item_action', 'aisp_custom_item_nonce' ); ?>

			<p>
				<label><?php esc_html_e( 'Custom name', 'aisp-order-tools-for-woocommerce' ); ?></label><br>
				<input type="text" name="aisp_custom_label" required style="width:260px;">
			</p>

			<p>
				<label><?php esc_html_e( 'Custom price', 'aisp-order-tools-for-woocommerce' ); ?></label><br>
				<input type="number" name="aisp_custom_price" required min="0" step="0.01" style="width:120px;">
			</p>

		</div>
		<?php
	}

	public function save_to_cart( $cart_item_data, $product_id ) {

		if (
			! isset( $_POST['aisp_custom_item_nonce'] ) ||
			! wp_verify_nonce(
				sanitize_text_field( wp_unslash( $_POST['aisp_custom_item_nonce'] ) ),
				'aisp_custom_item_action'
			)
		) {
			return $cart_item_data;
		}

		if ( empty( $_POST['aisp_custom_label'] ) || ! isset( $_POST['aisp_custom_price'] ) ) {
			return $cart_item_data;
		}

		$cart_item_data['aisp_custom_label'] = sanitize_text_field( wp_unslash( $_POST['aisp_custom_label'] ) );
		$raw_price                           = sanitize_text_field( wp_unslash( $_POST['aisp_custom_price'] ) );
		$cart_item_data['aisp_custom_price'] = wc_format_decimal( $raw_price );

		return $cart_item_data;
	}

	public function apply_custom_price( $cart ) {

		if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
			return;
		}

		foreach ( $cart->get_cart() as $item ) {
			if ( isset( $item['aisp_custom_price'] ) ) {
				$item['data']->set_price( $item['aisp_custom_price'] );
			}
		}
	}

	public function change_cart_item_name( $name, $cart_item, $cart_item_key ) {

		return isset( $cart_item['aisp_custom_label'] )
			? esc_html( $cart_item['aisp_custom_label'] )
			: $name;
	}

	public function add_to_order( $item, $cart_item_key, $values, $order ) {

		if ( isset( $values['aisp_custom_label'] ) ) {
			$item->set_name( sanitize_text_field( $values['aisp_custom_label'] ) );
		}

		if ( isset( $values['aisp_custom_price'] ) ) {
			$item->add_meta_data(
				esc_html__( 'Custom price', 'aisp-order-tools-for-woocommerce' ),
				wc_price( $values['aisp_custom_price'] )
			);
		}
	}

	public function block_direct_access() {

		if ( is_admin() || ! is_singular( 'product' ) ) {
			return;
		}

		$taxable_id = (int) get_option( 'aisp_otools_custom_item_taxable_id', 0 );
		$notax_id   = (int) get_option( 'aisp_otools_custom_item_notax_id', 0 );

		if ( ! in_array( get_the_ID(), [ $taxable_id, $notax_id ], true ) ) {
			return;
		}

		if ( current_user_can( 'manage_woocommerce' ) ) {
			return;
		}

		wp_safe_redirect( home_url() );
		exit;
	}

	public function block_trash( $trash, $post ) {

		if ( isset( $GLOBALS['aisp_otools_allow_delete'] ) && $GLOBALS['aisp_otools_allow_delete'] === true ) {
			return $trash;
		}

		if ( ! $post instanceof \WP_Post ) {
			return $trash;
		}

		$taxable_id = (int) get_option( 'aisp_otools_custom_item_taxable_id', 0 );
		$notax_id   = (int) get_option( 'aisp_otools_custom_item_notax_id', 0 );

		if ( in_array( $post->ID, [ $taxable_id, $notax_id ], true ) ) {
			wp_die(
				esc_html__( 'This product is managed by Order Tools and cannot be deleted manually.', 'aisp-order-tools-for-woocommerce' ),
				esc_html__( 'Action blocked', 'aisp-order-tools-for-woocommerce' ),
				[ 'back_link' => true ]
			);
		}

		return $trash;
	}

	public function block_delete( $post_id ) {

		if ( isset( $GLOBALS['aisp_otools_allow_delete'] ) && $GLOBALS['aisp_otools_allow_delete'] === true ) {
			return;
		}

		$taxable_id = (int) get_option( 'aisp_otools_custom_item_taxable_id', 0 );
		$notax_id   = (int) get_option( 'aisp_otools_custom_item_notax_id', 0 );

		if ( in_array( $post_id, [ $taxable_id, $notax_id ], true ) ) {
			wp_die(
				esc_html__( 'This product is required by Order Tools and cannot be deleted manually.', 'aisp-order-tools-for-woocommerce' ),
				esc_html__( 'Action blocked', 'aisp-order-tools-for-woocommerce' ),
				[ 'back_link' => true ]
			);
		}
	}
}