<?php

declare(strict_types=1);

namespace Domain\DTO;

// @responsibility: DTO für Content-Version-Daten aus Repository

final readonly class ContentVersionDTO
{
    public function __construct(
        public int $id,
        public int $orderId,
        public int $versionNumber,
        public string $content,
        public string $model,
        public int $tokensInput,
        public int $tokensOutput,
        public float $costUsd,
        public int $durationMs,
        public \DateTimeImmutable $createdAt,
        public ?string $title = null,
    ) {}

    /**
     * Create from database row.
     *
     * @param array<string, mixed> $row
     */
    public static function fromDatabaseRow(array $row): self
    {
        return new self(
            id: (int) $row['id'],
            orderId: (int) $row['order_id'],
            versionNumber: (int) $row['version_number'],
            content: (string) $row['content'],
            model: (string) ($row['model'] ?? 'unknown'),
            tokensInput: (int) ($row['tokens_input'] ?? 0),
            tokensOutput: (int) ($row['tokens_output'] ?? 0),
            costUsd: (float) ($row['cost_usd'] ?? 0.0),
            durationMs: (int) ($row['duration_ms'] ?? 0),
            createdAt: new \DateTimeImmutable($row['created_at'] ?? 'now'),
            title: $row['title'] ?? null,
        );
    }

    /**
     * Get total tokens used.
     */
    public function totalTokens(): int
    {
        return $this->tokensInput + $this->tokensOutput;
    }

    /**
     * Get content preview (first N characters).
     */
    public function preview(int $length = 200): string
    {
        if (mb_strlen($this->content) <= $length) {
            return $this->content;
        }

        return mb_substr($this->content, 0, $length) . '...';
    }
}