<?php
/**
 * Stable canvas graphs for gallery recipes.
 *
 * @package Bookline
 */

declare( strict_types=1 );

namespace Bookline\Application\Automation;

use Bookline\Domain\Automation\ActionStep;
use Bookline\Domain\Automation\ContextMode;

/**
 * Packs a linear recipe into a flow_layout step the builder can open.
 *
 * @since 0.1.0
 */
final class RecipeCanvas {

	/**
	 * First action: canvas positions and wires. Executor skips this type.
	 *
	 * @param string                     $prefix       Stable id prefix.
	 * @param string                     $trigger_id   Trigger catalogue id.
	 * @param string                     $trigger_kind event|relative|schedule.
	 * @param list<array<string, mixed>> $items        Ordered condition and action nodes.
	 *
	 * @since 0.1.0
	 */
	public static function layout_step(
		string $prefix,
		string $trigger_id,
		string $trigger_kind,
		array $items
	): ActionStep {
		$origin_x = 72;
		$origin_y = 36;
		$gap      = 156;
		$nodes    = [
			[
				'id'          => $prefix . '-t',
				'kind'        => 'trigger',
				'x'           => $origin_x,
				'y'           => $origin_y,
				'triggerId'   => $trigger_id,
				'triggerKind' => $trigger_kind,
			],
		];
		$edges    = [];
		$prev     = $prefix . '-t';
		$port     = 'next';
		$i        = 0;
		foreach ( $items as $item ) {
			++$i;
			$id   = $prefix . '-n' . (string) $i;
			$kind = isset( $item['kind'] ) ? (string) $item['kind'] : 'action';
			$y    = $origin_y + ( $i * $gap );
			if ( 'condition' === $kind ) {
				$nodes[] = [
					'id'         => $id,
					'kind'       => 'condition',
					'x'          => $origin_x,
					'y'          => $y,
					'identifier' => (string) ( $item['identifier'] ?? '' ),
					'config'     => isset( $item['config'] ) && is_array( $item['config'] ) ? $item['config'] : [],
				];
				$edges[] = [
					'id'   => $prefix . '-e' . (string) $i,
					'from' => $prev,
					'to'   => $id,
					'port' => $port,
				];
				$prev = $id;
				$port = 'true';
				continue;
			}
			$nodes[] = [
				'id'           => $id,
				'kind'         => 'action',
				'x'            => $origin_x,
				'y'            => $y,
				'type'         => (string) ( $item['type'] ?? 'log_activity' ),
				'delayMinutes' => (int) ( $item['delay_minutes'] ?? 0 ),
				'contextMode'  => (string) ( $item['context_mode'] ?? ContextMode::Snapshot->value ),
				'recipient'    => (string) ( $item['recipient'] ?? 'customer' ),
				'intent'       => (string) ( $item['intent'] ?? 'transactional' ),
				'config'       => isset( $item['config'] ) && is_array( $item['config'] ) ? $item['config'] : [],
			];
			$edges[] = [
				'id'   => $prefix . '-e' . (string) $i,
				'from' => $prev,
				'to'   => $id,
				'port' => $port,
			];
			$prev = $id;
			$port = 'next';
		}

		return new ActionStep(
			'flow_layout',
			[
				'v'     => 1,
				'nodes' => $nodes,
				'edges' => $edges,
			],
			0,
			0,
			ContextMode::Snapshot
		);
	}
}