<?php

namespace App\Services;

use stdClass;

class PartnershipMatching
{
    /** @param array<string,mixed>|null $assessment
     * @return array<string,mixed>
     */
    public function explain(stdClass $partnership, stdClass $interest, ?array $assessment = null): array
    {
        $assessment ??= json_decode($interest->assessment, true);
        $payload = json_decode($partnership->payload, true);
        $weights = config('partnerships.type_weights.'.$partnership->partnership_type, config('partnerships.weights'));
        $criteria = [];
        $known = $unknown = 0;
        $mandatoryUnmet = $mandatoryUnknown = false;
        foreach ($weights as $code => $weight) {
            $entry = $assessment[$code] ?? [];
            $state = $entry['state'] ?? 'unknown';
            if (in_array($state, ['met', 'unmet'], true) && empty($entry['evidence'])) {
                $state = 'unknown';
            }
            $mandatory = in_array($code, $payload['mandatory'] ?? [], true);
            $known += $state === 'met' ? $weight : 0;
            $unknown += $state === 'unknown' ? $weight : 0;
            $mandatoryUnmet = $mandatoryUnmet || ($mandatory && $state === 'unmet');
            $mandatoryUnknown = $mandatoryUnknown || ($mandatory && $state === 'unknown');
            $criteria[] = ['code' => $code, 'label' => config('partnerships.criteria.'.$code), 'weight' => $weight, 'state' => $state,
                'mandatory' => $mandatory, 'evidence' => $entry['evidence'] ?? null,
                'explanation' => $state === 'unknown' ? 'Informação insuficiente; declarações sem avaliação documental não provam cumprimento ou incumprimento.' : 'Avaliação fundamentada do responsável; não equivale a certificação ou aprovação.'];
        }
        $total = array_sum($weights);

        return ['algorithm_version' => 'transparent-rules.v1', 'weights_hash' => hash('sha256', json_encode($weights, JSON_THROW_ON_ERROR)), 'score_min' => $total ? round(100 * $known / $total, 1) : null,
            'score_max' => $total ? round(100 * ($known + $unknown) / $total, 1) : null,
            'eligibility' => $mandatoryUnmet ? 'unmet' : ($mandatoryUnknown ? 'unknown' : 'met'), 'criteria' => $criteria,
            'unknown_weight' => $unknown, 'recommendation_is_approval' => false];
    }
}