<?php

namespace App\Services;

use App\Models\InvestmentZone;
use App\Support\StructuredData;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;

/** Public park observations remain individual source records, never regional estimates. */
final class InvestmentMapIndicators
{
    public const INDICATORS = ['employment', 'investment', 'production', 'exports', 'local_procurement'];

    /** @param Collection<int, InvestmentZone> $zones
     * @return array<string,mixed> */
    public function forZones(Collection $zones, bool $zoneLimitReached = false): array
    {
        $zoneLimitReached = $zoneLimitReached || $zones->count() > 30;
        $zones = $zones->take(30)->values();
        $details = app(InvestmentZoneOperationalDetails::class);
        $result = ['state' => $details->installed() ? 'available' : 'unavailable', 'records' => [],
            'zones_consulted' => $zones->count(), 'zone_limit' => 30, 'record_limit' => 200, 'truncated' => $zoneLimitReached];
        if ($result['state'] === 'unavailable') {
            return $result;
        }
        foreach ($zones as $zone) {
            // This is the already selected public envelope; never decrypt the private preparation.
            $public = $details->publicData($zone);
            $observations = StructuredData::collectionItems($public['integral']['observations'] ?? []);
            $values = [];
            if ($observations !== []) {
                // Extract decimal text from this exact loaded snapshot, not a newer database version or a PHP float.
                foreach (DB::select("SELECT item->>'id' AS id, item->>'value' AS value FROM jsonb_array_elements((?::jsonb)->'public'->'integral'->'observations') AS item", [$zone->getRawOriginal('operational_details')]) as $number) {
                    $values[$number->id] = $number->value;
                }
            }
            foreach ($observations as $row) {
                if (! in_array($row['indicator'] ?? null, self::INDICATORS, true)) {
                    continue;
                }
                if (count($result['records']) === 200) {
                    $result['truncated'] = true;

                    return $result;
                }
                $knowledge = $row['knowledge'] ?? 'unknown';
                $rawValue = $values[$row['id'] ?? ''] ?? null;
                $value = $knowledge !== 'unknown' && is_numeric($rawValue) ? $rawValue : null;
                $missing = [];
                foreach (['unit', 'period_start', 'period_end', 'scope', 'population', 'methodology', 'source_reference', 'source_date'] as $field) {
                    if (trim((string) ($row[$field] ?? '')) === '') {
                        $missing[] = $field;
                    }
                }
                $result['records'][] = [
                    ...array_intersect_key($row, array_flip(['id', 'label', 'description', 'indicator', 'unit', 'period_start', 'period_end', 'scope', 'population', 'methodology', 'source_reference', 'source_date', 'phase_id', 'plot_id'])),
                    'zone_id' => $zone->id, 'zone_name' => $zone->name, 'zone_version' => (int) $zone->version_no, 'url' => '/zonas/'.$zone->id,
                    'theme' => $row['indicator'] === 'employment' ? 'workforce' : 'economic_potential',
                    'value' => $value, 'knowledge' => $knowledge, 'missing_metadata' => $missing,
                ];
            }
        }

        return $result;
    }
}