<?php

declare(strict_types=1);

namespace TFGraphics\SmartImport\ProviderFramework;

final class ProviderReasoning
{
    private array $decisions = [];

    public function __construct(array $decisions)
    {
        foreach ($decisions as $decision) {
            if (! $decision instanceof ProviderDecision) throw new \InvalidArgumentException('Reasoning requires provider decisions.');
            $this->decisions[strtolower($decision->getProviderName())] = $decision;
        }
    }

    public function getDecision(string $providerName): ?ProviderDecision
    {
        return $this->decisions[strtolower(trim($providerName))] ?? null;
    }

    public function explain(string $providerName): string
    {
        $decision = $this->getDecision($providerName);

        return $decision === null ? 'Provider is not registered.' : $decision->getReason();
    }

    public function getDecisions(): array { return array_values($this->decisions); }
}