<?php
namespace App\Console\Commands;

use App\Models\IstatIndiceMensile;
use Illuminate\Console\Command;
use Illuminate\Support\Arr;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Http;

class IstatSyncIndiciCommand extends Command
{
    protected $signature = 'istat:sync-indici
        {--url= : URL JSON sorgente}
        {--file= : File JSON locale}
        {--series=FOI : Codice serie ISTAT (es. FOI)}
        {--source=ISTAT API : Nome fonte}
        {--dry-run : Mostra righe parsate senza salvare}';

    protected $description = 'Sincronizza indici ISTAT mensili da URL o file JSON';

    public function handle(): int
    {
        $series = strtoupper((string) $this->option('series'));
        $source = (string) $this->option('source');
        $dryRun = (bool) $this->option('dry-run');

        $url  = trim((string) ($this->option('url') ?: config('services.istat.api_url', '')));
        $file = trim((string) ($this->option('file') ?: ''));

        if ($url === '' && $file === '') {
            $this->error('Specifica --url oppure --file (oppure configura ISTAT_API_URL).');
            return self::FAILURE;
        }

        try {
            $payload = $this->loadPayload($url, $file);
            $rows    = $this->extractRows($payload);
            if (empty($rows)) {
                $this->warn('Nessuna riga valida trovata nella sorgente.');
                return self::SUCCESS;
            }

            $upserts = [];
            foreach ($rows as $row) {
                $normalized = $this->normalizeRow($row);
                if (! $normalized) {
                    continue;
                }

                $upserts[] = [
                    'codice_serie'       => $series,
                    'anno'               => $normalized['anno'],
                    'mese'               => $normalized['mese'],
                    'indice'             => $normalized['indice'],
                    'fonte'              => $source,
                    'data_pubblicazione' => $normalized['data_pubblicazione'],
                    'payload'            => $row,
                    'sincronizzato_il'   => now(),
                    'created_at'         => now(),
                    'updated_at'         => now(),
                ];
            }

            if (empty($upserts)) {
                $this->warn('Righe presenti ma nessuna convertibile in (anno,mese,indice).');
                return self::SUCCESS;
            }

            if ($dryRun) {
                $this->info('Dry-run: ' . count($upserts) . ' righe parsate.');
                $this->table(['serie', 'anno', 'mese', 'indice'], collect($upserts)->take(20)->map(fn($r) => [
                    $r['codice_serie'],
                    $r['anno'],
                    $r['mese'],
                    $r['indice'],
                ])->all());
                return self::SUCCESS;
            }

            IstatIndiceMensile::query()->upsert(
                $upserts,
                ['codice_serie', 'anno', 'mese'],
                ['indice', 'fonte', 'data_pubblicazione', 'payload', 'sincronizzato_il', 'updated_at']
            );

            $this->info('Sincronizzazione completata: ' . count($upserts) . ' righe upsertate.');
            return self::SUCCESS;
        } catch (\Throwable $e) {
            $this->error('Errore sincronizzazione ISTAT: ' . $e->getMessage());
            return self::FAILURE;
        }
    }

    private function loadPayload(string $url, string $file): array
    {
        if ($file !== '') {
            if (! is_file($file)) {
                throw new \RuntimeException('File non trovato: ' . $file);
            }
            $decoded = json_decode((string) file_get_contents($file), true);
            if (! is_array($decoded)) {
                throw new \RuntimeException('JSON file non valido.');
            }
            return $decoded;
        }

        $timeout = (int) config('services.istat.timeout', 30);
        $resp    = Http::timeout(max(5, $timeout))->get($url);
        if (! $resp->successful()) {
            throw new \RuntimeException('HTTP ' . $resp->status() . ' da sorgente ISTAT.');
        }

        $decoded = $resp->json();
        if (! is_array($decoded)) {
            throw new \RuntimeException('Risposta JSON non valida.');
        }

        return $decoded;
    }

    private function extractRows(array $payload): array
    {
        if (isset($payload[0]) && is_array($payload[0])) {
            return $payload;
        }

        foreach (['data', 'rows', 'values', 'result'] as $k) {
            $v = Arr::get($payload, $k);
            if (is_array($v) && isset($v[0]) && is_array($v[0])) {
                return $v;
            }
        }

        return [];
    }

    private function normalizeRow(array $row): ?array
    {
        $anno   = $row['anno'] ?? $row['year'] ?? null;
        $mese   = $row['mese'] ?? $row['month'] ?? null;
        $indice = $row['indice'] ?? $row['value'] ?? $row['valore'] ?? null;

        $period = (string) ($row['periodo'] ?? $row['period'] ?? '');
        if (($anno === null || $mese === null) && preg_match('/^(\d{4})[-\/](\d{1,2})$/', $period, $m)) {
            $anno = (int) $m[1];
            $mese = (int) $m[2];
        }

        if (! is_numeric($anno) || ! is_numeric($mese) || ! is_numeric($indice)) {
            return null;
        }

        $anno   = (int) $anno;
        $mese   = (int) $mese;
        $indice = (float) $indice;

        if ($anno < 1900 || $anno > 2300 || $mese < 1 || $mese > 12) {
            return null;
        }

        $pub     = $row['data_pubblicazione'] ?? $row['published_at'] ?? null;
        $pubDate = null;
        if (is_string($pub) && trim($pub) !== '') {
            try {
                $pubDate = Carbon::parse($pub)->format('Y-m-d');
            } catch (\Throwable) {
                $pubDate = null;
            }
        }

        return [
            'anno'               => $anno,
            'mese'               => $mese,
            'indice'             => $indice,
            'data_pubblicazione' => $pubDate,
        ];
    }
}