<?php

namespace App\Services\Didit;

class DiditDecisionExtractor
{
    public function extract(array $decision): array
    {
        $id       = $this->first($decision, 'id_verifications');
        $liveness = $this->first($decision, 'liveness_checks');
        $face     = $this->first($decision, 'face_matches');

        return [
            'id_verification_status'     => data_get($id, 'status'),
            'liveness_status'            => data_get($liveness, 'status'),
            'face_match_status'          => data_get($face, 'status'),

            'liveness_score'   => $this->score($liveness, 'liveness_score'),
            'face_match_score' => $this->score($face, 'face_match_score'),

            'warnings' => $this->warnings($decision),
        ];
    }

    public function extractDocument(array $decision): ?string
    {
        $id = $this->first($decision, 'id_verifications');

        $taxNumber = data_get($id, 'extra_fields.tax_number');

        return is_string($taxNumber) && $taxNumber !== ''
            ? preg_replace('/\D+/', '', $taxNumber)
            : null;
    }

    /** @return list<array<string, mixed>> */
    public function warnings(array $decision): array
    {
        $warnings = [];

        foreach ($this->featureKeys() as $key) {
            foreach ($this->items($decision, $key) as $item) {
                foreach ((array) data_get($item, 'warnings', []) as $warning) {
                    $warnings[] = $warning;
                }
            }
        }

        return $warnings;
    }

    public function actionableWarnings(array $decision): array
    {
        return array_values(array_filter(
            $this->warnings($decision),
            static fn ($warning) => data_get($warning, 'log_type') === 'warning',
        ));
    }

    /** @return list<string> */
    public function featureKeys(): array
    {
        return [
            'id_verifications',
            'liveness_checks',
            'face_matches',
            'ip_analyses',
            'nfc_verifications',
            'aml_screenings',
            'poa_verifications',
        ];
    }

    public function items(array $decision, string $key): array
    {
        $value = data_get($decision, $key);

        return is_array($value) ? $value : [];
    }

    public function first(array $decision, string $key): ?array
    {
        $items = $this->items($decision, $key);

        return $items === [] ? null : (array) reset($items);
    }

    private function score(?array $item, string $fallbackKey): ?float
    {
        if ($item === null) {
            return null;
        }

        $value = data_get($item, 'score')
            ?? data_get($item, $fallbackKey)
            ?? data_get($item, 'similarity_percentage');

        if (! is_numeric($value)) {
            return null;
        }

        $value = (float) $value;

        return $value <= 1 ? round($value * 100, 2) : round($value, 2);
    }
}