<?php
/**
 * SMS gateways admin screen.
 *
 * @package Rahkar\WP
 */

declare( strict_types = 1 );

namespace Rahkar\WP\Modules\Notifications;

use Rahkar\WP\Admin\FieldRenderer;
use Rahkar\WP\Admin\Help;
use Rahkar\WP\Admin\Menu;
use Rahkar\WP\Admin\PatternPicker;
use Rahkar\WP\Admin\Ui;
use Rahkar\WP\Contracts\CheckableDriver;
use Rahkar\WP\Contracts\PatternLookupDriver;
use Rahkar\WP\Contracts\SmsDriver;
use Rahkar\WP\Contracts\VoiceOtpDriver;
use Rahkar\WP\Notifications\Gateways;
use Rahkar\WP\Support\Settings;

defined( 'ABSPATH' ) || exit;

/**
 * Which SMS providers the store sends through, and in which order.
 *
 * One card per gateway the registry knows about, with its credentials, whether
 * it is on, and its place in the order. A gateway added later — by this plugin
 * or an add-on — appears here with no change to this screen.
 *
 * Credentials live here rather than on the general settings screen because a
 * gateway is a thing with state the store owner needs to see: configured or
 * not, reachable or not, what it can do. A block of text fields cannot say any
 * of that.
 */
final class GatewaysPage {

	public const SLUG = Menu::SLUG . '-gateways';

	private const NONCE = 'rahkar_wp_gateways';

	/**
	 * Settings row the gateways' fields are stored in.
	 */
	private const MODULE = 'notifications';

	/**
	 * Renders driver fields exactly as the settings screen does.
	 *
	 * @var FieldRenderer
	 */
	private FieldRenderer $fields;

	/**
	 * Set up the field renderer.
	 */
	public function __construct() {
		$this->fields = new FieldRenderer();
	}

	/**
	 * Render the screen.
	 */
	public function render(): void {
		if ( ! current_user_can( Menu::CAPABILITY ) ) {
			wp_die( esc_html__( 'شما اجازه دسترسی به این صفحه را ندارید.', 'rahkar-toolkit' ) );
		}

		$notice = $this->handleSubmission();

		Ui::pageOpen(
			__( 'درگاه‌های پیامک', 'rahkar-toolkit' ),
			__( 'سرویس‌دهنده‌هایی که فروشگاه از طریقشان پیامک می‌فرستد. اگر چند درگاه روشن باشد، به ترتیب اولویت امتحان می‌شوند و اگر اولی نپذیرفت، بعدی.', 'rahkar-toolkit' ),
			Help::link( self::MODULE, __( 'اطلاع‌رسانی', 'rahkar-toolkit' ) )
		);

		if ( '' !== $notice['message'] ) {
			echo wp_kses( Ui::notice( $notice['type'], $notice['message'] ), Ui::allowedHtml() );
		}

		$gateways = Gateways::available();

		if ( [] === $gateways ) {
			echo wp_kses( Ui::emptyState( __( 'هیچ درگاه پیامکی ثبت نشده است.', 'rahkar-toolkit' ), '', 'plug' ), Ui::allowedHtml() );
			Ui::pageClose();

			return;
		}

		$enabled = Gateways::enabledIds();
		$values  = Settings::all( self::MODULE );

		Ui::formOpen();
		wp_nonce_field( self::NONCE );

		foreach ( $gateways as $id => $driver ) {
			$position = array_search( $id, $enabled, true );

			$this->renderGateway( $id, $driver, false !== $position, false === $position ? count( $enabled ) + 1 : $position + 1, $values );
		}

		$this->renderPolicy();

		Ui::formClose();
		Ui::pageClose();
	}

	/**
	 * One gateway's card.
	 *
	 * @param string               $id       Gateway id.
	 * @param SmsDriver            $driver   The gateway.
	 * @param bool                 $isOn     Whether it is enabled.
	 * @param int                  $priority Its place in the order, 1-based.
	 * @param array<string, mixed> $values   Stored settings.
	 */
	private function renderGateway( string $id, SmsDriver $driver, bool $isOn, int $priority, array $values ): void {
		$badges = $driver->isConfigured()
			? Ui::badge( __( 'تنظیم‌شده', 'rahkar-toolkit' ), 'success' )
			: Ui::badge( __( 'تنظیمات ناقص', 'rahkar-toolkit' ), 'warning' );

		if ( $driver instanceof VoiceOtpDriver ) {
			$badges .= Ui::badge( __( 'تماس صوتی', 'rahkar-toolkit' ), 'info' );
		}

		Ui::panelOpen( $driver->name(), '', 'plug', $badges, 'gateway-' . $id );

		Ui::rowOpen( __( 'استفاده از این درگاه', 'rahkar-toolkit' ), 'rahkar-gw-on-' . $id );
		echo wp_kses( Ui::toggle( 'rahkar_gw[' . $id . '][enabled]', $isOn, [ 'id' => 'rahkar-gw-on-' . $id ] ), Ui::allowedHtml() );
		Ui::rowClose();

		Ui::rowOpen(
			__( 'اولویت', 'rahkar-toolkit' ),
			'rahkar-gw-priority-' . $id,
			__( 'عدد کمتر زودتر امتحان می‌شود.', 'rahkar-toolkit' )
		);
		echo wp_kses( Ui::input( 'number', 'rahkar_gw[' . $id . '][priority]', (string) $priority, [ 'id' => 'rahkar-gw-priority-' . $id, 'min' => '1', 'max' => '99' ] ), Ui::allowedHtml() );
		Ui::rowClose();

		foreach ( $driver->settingsSchema() as $key => $field ) {
			$name = 'rahkar_gw_field[' . $key . ']';

			Ui::rowOpen( (string) ( $field['label'] ?? $key ), sanitize_html_class( str_replace( [ '[', ']' ], '-', $name ) ), (string) ( $field['help'] ?? '' ) );
			$this->fields->render( $name, $field, $values[ $key ] ?? ( $field['default'] ?? '' ) );
			Ui::rowClose();
		}

		if ( $driver instanceof PatternLookupDriver ) {
			Ui::rowOpen(
				__( 'الگوهای پنل', 'rahkar-toolkit' ),
				'rahkar-gw-lookup-' . $id,
				__( 'فهرست الگوهای پنل را ببینید، یا کد یک الگو را وارد کنید تا متن، متغیرها و وضعیتش خوانده شود. فقط برای دیدن است و چیزی ذخیره نمی‌کند.', 'rahkar-toolkit' )
			);
			// No name: this box is for looking, and must never be submitted.
			echo wp_kses( Ui::input( 'text', '', '', [ 'id' => 'rahkar-gw-lookup-' . $id, 'dir' => 'ltr' ], true ), Ui::allowedHtml() );
			echo wp_kses( PatternPicker::controls( $id, 'rahkar-gw-lookup-' . $id ), Ui::allowedHtml() );
			Ui::rowClose();
		}

		$footer = Ui::button( __( 'ذخیره', 'rahkar-toolkit' ), 'primary', [ 'type' => 'submit', 'name' => 'rahkar_gw_action', 'value' => 'save' ], '', 'check' );

		if ( $driver instanceof CheckableDriver ) {
			$footer .= Ui::button( __( 'ذخیره و تست اتصال', 'rahkar-toolkit' ), 'secondary', [ 'type' => 'submit', 'name' => 'rahkar_gw_action', 'value' => 'check:' . $id ], '', 'gauge' );
		}

		Ui::panelClose( $footer );
	}

	/**
	 * What to do when a gateway refuses.
	 */
	private function renderPolicy(): void {
		Ui::panelOpen( __( 'وقتی درگاهی ارسال را نپذیرفت', 'rahkar-toolkit' ), '', 'refresh' );

		Ui::rowOpen( __( 'رفتار', 'rahkar-toolkit' ), 'rahkar-gw-policy' );
		echo wp_kses( Ui::select(
			'rahkar_gw_policy',
			[
				Gateways::POLICY_FAILOVER   => __( 'درگاه بعدی امتحان شود (پیشنهادی)', 'rahkar-toolkit' ),
				Gateways::POLICY_FIRST_ONLY => __( 'فقط درگاه اول؛ خطای آن نتیجه نهایی است', 'rahkar-toolkit' ),
			],
			Gateways::policy(),
			[ 'id' => 'rahkar-gw-policy' ]
		), Ui::allowedHtml() );
		Ui::rowClose();

		Ui::panelClose(
			Ui::button( __( 'ذخیره', 'rahkar-toolkit' ), 'primary', [ 'type' => 'submit', 'name' => 'rahkar_gw_action', 'value' => 'save' ], '', 'check' )
		);
	}

	/**
	 * Apply a submission.
	 *
	 * Every action saves first: a store owner who types a key and presses "test"
	 * expects the key they typed to be the one tested.
	 *
	 * @return array{type: string, message: string}
	 */
	private function handleSubmission(): array {
		if ( ! isset( $_POST['rahkar_gw_action'] ) ) {
			return [
				'type'    => '',
				'message' => '',
			];
		}

		check_admin_referer( self::NONCE );

		$action = sanitize_text_field( wp_unslash( $_POST['rahkar_gw_action'] ) );

		$this->save();

		[ $verb, $id ] = array_pad( explode( ':', $action, 2 ), 2, '' );
		$driver        = Gateways::available()[ $id ] ?? null;

		if ( 'check' === $verb && $driver instanceof CheckableDriver ) {
			$check = $driver->checkConnection();

			return [
				'type'    => $check->ok ? 'success' : 'error',
				'message' => $driver->name() . ' — ' . $check->message,
			];
		}

		return [
			'type'    => 'success',
			'message' => __( 'تنظیمات درگاه‌ها ذخیره شد.', 'rahkar-toolkit' ),
		];
	}

	/**
	 * Persist enabled gateways, their order, the policy and every driver field.
	 */
	private function save(): void {
		// phpcs:disable WordPress.Security.NonceVerification.Missing -- Verified in handleSubmission(), the only caller.
		$posted = isset( $_POST['rahkar_gw'] ) && is_array( $_POST['rahkar_gw'] )
			? map_deep( wp_unslash( $_POST['rahkar_gw'] ), 'sanitize_text_field' )
			: [];
		$fields = isset( $_POST['rahkar_gw_field'] ) && is_array( $_POST['rahkar_gw_field'] )
			? map_deep( wp_unslash( $_POST['rahkar_gw_field'] ), 'sanitize_text_field' )
			: [];
		$policy = isset( $_POST['rahkar_gw_policy'] ) ? sanitize_key( wp_unslash( $_POST['rahkar_gw_policy'] ) ) : Gateways::POLICY_FAILOVER;
		// phpcs:enable WordPress.Security.NonceVerification.Missing

		$order  = [];
		$values = [];

		foreach ( Gateways::available() as $id => $driver ) {
			$row = is_array( $posted[ $id ] ?? null ) ? $posted[ $id ] : [];

			if ( ! empty( $row['enabled'] ) ) {
				$order[ $id ] = max( 1, (int) ( $row['priority'] ?? 99 ) );
			}

			foreach ( $driver->settingsSchema() as $key => $field ) {
				if ( ! array_key_exists( $key, $fields ) ) {
					continue;
				}

				// An empty secret means "unchanged": the field is rendered empty on
				// purpose in some browsers' autofill handling, and wiping a working
				// API key because a box looked blank would stop every send.
				if ( 'password' === ( $field['type'] ?? '' ) && '' === trim( (string) $fields[ $key ] ) ) {
					continue;
				}

				$values[ $key ] = $this->fields->sanitize( $field, $fields[ $key ] );
			}
		}

		// Sorted by priority, and by registry order where priorities tie.
		$ranked = [];

		foreach ( array_keys( $order ) as $index => $id ) {
			$ranked[] = [ $order[ $id ], $index, $id ];
		}

		sort( $ranked );

		$values['sms_gateways'] = array_column( $ranked, 2 );
		$values['sms_policy']   = Gateways::POLICY_FIRST_ONLY === $policy ? Gateways::POLICY_FIRST_ONLY : Gateways::POLICY_FAILOVER;

		Settings::save( self::MODULE, $values );

		// A new key can mean a different panel with different patterns.
		foreach ( array_keys( Gateways::available() ) as $id ) {
			PatternPicker::flush( $id );
		}
	}
}