<?php

declare(strict_types=1);

namespace App\Framework\Queue\ValueObjects;

/**
 * Value Object representing a single step in job progress tracking
 */
final readonly class ProgressStep
{
    public function __construct(
        public string $stepName,
        public string $description,
        public bool $completed = false,
        public ?string $completedAt = null,
        public ?array $metadata = null
    ) {
        $this->validate();
    }

    public static function create(string $stepName, string $description, ?array $metadata = null): self
    {
        return new self(
            stepName: $stepName,
            description: $description,
            metadata: $metadata
        );
    }

    public static function completed(string $stepName, string $description, ?array $metadata = null): self
    {
        return new self(
            stepName: $stepName,
            description: $description,
            completed: true,
            completedAt: date('Y-m-d H:i:s'),
            metadata: $metadata
        );
    }

    public function markAsCompleted(?array $additionalMetadata = null): self
    {
        $metadata = $this->metadata ?? [];
        if ($additionalMetadata) {
            $metadata = array_merge($metadata, $additionalMetadata);
        }

        return new self(
            stepName: $this->stepName,
            description: $this->description,
            completed: true,
            completedAt: date('Y-m-d H:i:s'),
            metadata: $metadata
        );
    }

    public function withMetadata(array $metadata): self
    {
        return new self(
            stepName: $this->stepName,
            description: $this->description,
            completed: $this->completed,
            completedAt: $this->completedAt,
            metadata: array_merge($this->metadata ?? [], $metadata)
        );
    }

    public function getDisplayName(): string
    {
        return $this->stepName;
    }

    public function getStatus(): string
    {
        return $this->completed ? 'completed' : 'pending';
    }

    public function toArray(): array
    {
        return [
            'step_name' => $this->stepName,
            'description' => $this->description,
            'completed' => $this->completed,
            'completed_at' => $this->completedAt,
            'status' => $this->getStatus(),
            'metadata' => $this->metadata
        ];
    }

    private function validate(): void
    {
        if (empty(trim($this->stepName))) {
            throw new \InvalidArgumentException('Step name cannot be empty');
        }

        if (empty(trim($this->description))) {
            throw new \InvalidArgumentException('Step description cannot be empty');
        }

        if ($this->completed && !$this->completedAt) {
            throw new \InvalidArgumentException('Completed steps must have a completion timestamp');
        }
    }
}