<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Abstract base class for AISP Custom Payment methods.
 */
abstract class AISP_CPM_Custom_Payment_Base extends WC_Payment_Gateway {

	public $id;
	public $method_title;
	public $method_description;
	public $title;
	public $description;
	public $enabled;
	public $order_status;
	public $instructions;
	public $allowed_users;

	public function __construct( $id, $title, $description ) {

		$this->id                 = sanitize_key( $id );
		$this->method_title       = esc_html( $title );
		$this->method_description = esc_html( $description );

		$this->init_form_fields();
		$this->init_settings();

		$this->title         = sanitize_text_field( $this->get_option( 'title' ) );
		$this->description   = sanitize_textarea_field( $this->get_option( 'description' ) );
		$this->enabled       = sanitize_text_field( $this->get_option( 'enabled' ) );
		$this->order_status  = sanitize_text_field( $this->get_option( 'order_status' ) );
		$this->instructions  = sanitize_textarea_field( $this->get_option( 'instructions' ) );
		$this->allowed_users = $this->get_option( 'allowed_users', array() );

		add_action( 'woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options' ) );
		add_action( 'woocommerce_email_before_order_table', array( $this, 'add_instructions_to_email' ), 10, 4 );
		add_action( 'woocommerce_thankyou', array( $this, 'display_instructions_on_thankyou_page' ) );
	}

	public function init_form_fields() {

		include_once( ABSPATH . 'wp-admin/includes/plugin.php' );

		$all_statuses     = wc_get_order_statuses();
		$allowed_statuses = array();

		if ( is_plugin_active( 'aisp-order-tools/aisp-order-tools.php' ) ) {
			$allowed_statuses['wc-pending'] = $all_statuses['wc-pending'];
		}

		$allowed_statuses['wc-on-hold']    = $all_statuses['wc-on-hold'];
		$allowed_statuses['wc-processing'] = $all_statuses['wc-processing'];

		$this->form_fields = array(

			'enabled' => array(
				'title'   => esc_html__( 'Enable/Disable', 'aisp-custom-payment-manager' ),
				'type'    => 'checkbox',
				'label'   => esc_html__( 'Enable this payment method', 'aisp-custom-payment-manager' ),
				'default' => 'yes',
			),

			'title' => array(
				'title'       => esc_html__( 'Title', 'aisp-custom-payment-manager' ),
				'type'        => 'text',
				'description' => esc_html__( 'The title displayed to customers.', 'aisp-custom-payment-manager' ),
				'default'     => esc_html__( 'Custom Payment', 'aisp-custom-payment-manager' ),
			),

			'description' => array(
				'title'       => esc_html__( 'Description', 'aisp-custom-payment-manager' ),
				'type'        => 'textarea',
				'description' => esc_html__( 'The description displayed to customers.', 'aisp-custom-payment-manager' ),
				'default'     => esc_html__( 'Pay using this custom method.', 'aisp-custom-payment-manager' ),
			),

			'order_status' => array(
				'title'       => esc_html__( 'Order Status', 'aisp-custom-payment-manager' ),
				'type'        => 'select',
				'description' => esc_html__( 'Set the order status after payment.', 'aisp-custom-payment-manager' ),
				'options'     => $allowed_statuses,
				'default'     => 'wc-on-hold',
			),

			'instructions' => array(
				'title'       => esc_html__( 'Instructions', 'aisp-custom-payment-manager' ),
				'type'        => 'textarea',
				'description' => esc_html__( 'Instructions included in the email and thank-you page.', 'aisp-custom-payment-manager' ),
				'default'     => '',
			),

			'allowed_users' => array(
				'title'       => esc_html__( 'Allowed Users', 'aisp-custom-payment-manager' ),
				'type'        => 'multiselect',
				'description' => esc_html__( 'Search and select users allowed to use this payment method. Leave empty to allow all users.', 'aisp-custom-payment-manager' ),
				'options'     => $this->get_user_list(),
				'default'     => array(),
				'class'       => 'wc-customer-search',
			),
		);
	}

	/**
	 * Build the user list for the admin multiselect.
	 *
	 * Only loads users already saved in the setting, keeping the initial
	 * page load fast regardless of site size. New users are found via the
	 * AJAX search powered by wc-customer-search / Select2, which queries
	 * the WooCommerce customer search endpoint automatically.
	 *
	 * @return array  $user_id => display_name pairs.
	 */
	private function get_user_list() {

		$saved = $this->get_option( 'allowed_users', array() );
		$list  = array();

		if ( empty( $saved ) ) {
			return $list;
		}

		$users = get_users( array(
			'include' => array_map( 'intval', $saved ),
			'fields'  => array( 'ID', 'display_name' ),
		) );

		foreach ( $users as $user ) {
			$list[ $user->ID ] = esc_html( $user->display_name );
		}

		return $list;
	}

	public function is_available() {

		if ( 'yes' !== $this->enabled ) {
			return false;
		}

		if ( empty( $this->allowed_users ) ) {
			return true;
		}

		return in_array( get_current_user_id(), array_map( 'intval', $this->allowed_users ), true );
	}

	public function process_payment( $order_id ) {

		$order = wc_get_order( $order_id );

		if ( ! $order ) {
			return array( 'result' => 'fail' );
		}

		$order->update_status(
			$this->order_status,
			'Awaiting payment confirmation.'
		);

		return array(
			'result'   => 'success',
			'redirect' => $this->get_return_url( $order ),
		);
	}

	/**
	 * Map an order status slug to its corresponding WooCommerce customer email ID.
	 *
	 * This ensures instructions are injected into the correct email regardless
	 * of which order status is configured for this gateway.
	 *
	 * @param string $order_status  e.g. 'wc-on-hold', 'wc-processing'.
	 * @return string|null          WooCommerce email ID, or null if not mapped.
	 */
	private function get_email_id_for_status( $order_status ) {

		$map = array(
			'wc-pending'    => 'customer_pending_order',
			'wc-on-hold'    => 'customer_on_hold_order',
			'wc-processing' => 'customer_processing_order',
		);

		return isset( $map[ $order_status ] ) ? $map[ $order_status ] : null;
	}

	public function add_instructions_to_email( $order, $sent_to_admin, $plain_text, $email ) {

		$expected_email_id = $this->get_email_id_for_status( $this->order_status );

		if ( ! $expected_email_id || ! isset( $email->id ) || $email->id !== $expected_email_id ) {
			return;
		}

		if ( $order->get_payment_method() !== $this->id ) {
			return;
		}

		if ( ! $this->instructions ) {
			return;
		}

		if ( $plain_text ) {
			echo esc_html__( 'Payment Instructions', 'aisp-custom-payment-manager' ) . ":\n";
			echo wp_kses_post( wpautop( wptexturize( $this->instructions ) ) );
		} else {
			echo '<h2>' . esc_html__( 'Payment Instructions', 'aisp-custom-payment-manager' ) . '</h2>';
			echo wp_kses_post( wpautop( wptexturize( $this->instructions ) ) );
		}
	}

	public function display_instructions_on_thankyou_page( $order_id ) {

		$order = wc_get_order( $order_id );

		if ( $order && $this->instructions && $order->get_payment_method() === $this->id ) {
			echo '<div class="custom-payment-instructions">';
			echo '<h2>' . esc_html__( 'Payment Instructions', 'aisp-custom-payment-manager' ) . '</h2>';
			echo wp_kses_post( wpautop( wptexturize( $this->instructions ) ) );
			echo '</div>';
		}
	}
}