<?php

namespace App\Support\Badges;

use InvalidArgumentException;

final class BadgeSpec
{
    /**
     * @var array<int, string>
     */
    private const ALLOWED_COLORS = [
        'gray',
        'info',
        'success',
        'warning',
        'danger',
        'primary',
    ];

    public function __construct(
        public readonly string $label,
        public readonly string $color,
        public readonly ?string $icon = null,
        public readonly ?string $iconColor = null,
    ) {
        if (trim($this->label) === '') {
            throw new InvalidArgumentException('BadgeSpec label must be a non-empty string.');
        }

        if (! in_array($this->color, self::ALLOWED_COLORS, true)) {
            throw new InvalidArgumentException('BadgeSpec color must be one of: '.implode(', ', self::ALLOWED_COLORS));
        }

        if ($this->icon !== null && trim($this->icon) === '') {
            throw new InvalidArgumentException('BadgeSpec icon must be null or a non-empty string.');
        }

        if ($this->iconColor !== null && ! in_array($this->iconColor, self::ALLOWED_COLORS, true)) {
            throw new InvalidArgumentException('BadgeSpec iconColor must be null or one of: '.implode(', ', self::ALLOWED_COLORS));
        }
    }

    /**
     * @return array<int, string>
     */
    public static function allowedColors(): array
    {
        return self::ALLOWED_COLORS;
    }

    public static function unknown(): self
    {
        return new self(
            label: 'Unknown',
            color: 'gray',
            icon: 'heroicon-m-question-mark-circle',
            iconColor: 'gray',
        );
    }
}