<?php

namespace App\Services;

use Illuminate\Support\Facades\Cache;

class TerritorioPdfImportState
{
    protected int $ttlSeconds = 86400;

    public function initialize(string $importId, int $totalFiles): array
    {
        $state = [
            'id' => $importId,
            'status' => 'queued',
            'stats' => [
                'total' => $totalFiles,
                'processed' => 0,
                'updated' => 0,
                'skipped' => 0,
                'errors' => 0,
            ],
            'logs' => [
                'Import creato. In attesa del worker di coda.',
            ],
            'issues' => [],
            'started_at' => null,
            'finished_at' => null,
        ];

        $this->put($importId, $state);

        return $state;
    }

    public function get(string $importId): ?array
    {
        return Cache::get($this->key($importId));
    }

    public function put(string $importId, array $state): void
    {
        Cache::put($this->key($importId), $state, $this->ttlSeconds);
    }

    public function update(string $importId, callable $callback): ?array
    {
        $state = $this->get($importId);

        if (! $state) {
            return null;
        }

        $updatedState = $callback($state) ?? $state;
        $this->put($importId, $updatedState);

        return $updatedState;
    }

    public function appendLog(string $importId, string $message): void
    {
        $this->update($importId, function (array $state) use ($message) {
            $timestamp = now()->format('H:i:s');
            $state['logs'][] = '[' . $timestamp . '] ' . $message;

            return $state;
        });
    }

    public function increment(string $importId, string $metric, int $amount = 1): void
    {
        $this->update($importId, function (array $state) use ($metric, $amount) {
            $state['stats'][$metric] = ($state['stats'][$metric] ?? 0) + $amount;

            return $state;
        });
    }

    public function addIssue(string $importId, array $issue): void
    {
        $this->update($importId, function (array $state) use ($issue) {
            $state['issues'][] = $issue;

            return $state;
        });
    }

    public function markRunning(string $importId): void
    {
        $this->update($importId, function (array $state) {
            $state['status'] = 'running';
            $state['started_at'] = now()->toDateTimeString();

            return $state;
        });
    }

    public function markCompleted(string $importId): void
    {
        $this->update($importId, function (array $state) {
            $state['status'] = 'completed';
            $state['finished_at'] = now()->toDateTimeString();

            return $state;
        });
    }

    public function markFailed(string $importId): void
    {
        $this->update($importId, function (array $state) {
            $state['status'] = 'failed';
            $state['finished_at'] = now()->toDateTimeString();

            return $state;
        });
    }

    protected function key(string $importId): string
    {
        return 'territori-pdf-import:' . $importId;
    }
}