<?php

namespace App\Domains\Ticketing\Ticket\Services;

use Carbon\CarbonImmutable;
use DateTimeZone;
use Illuminate\Support\Facades\DB;
use InvalidArgumentException;

class ConvertValidityTimesToUtcService
{
    /**
     * @param  array<int, int>  $ids
     * @return array<int, array<string, mixed>>
     */
    public function run(array $ids, string $timezone, bool $apply = false, bool $all = false, bool $reverse = false): array
    {
        if (! in_array($timezone, DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC), true)) {
            throw new InvalidArgumentException('Zona horaria inválida.');
        }
        if ($all === ($ids !== [])) {
            throw new InvalidArgumentException('Indicar --all o --ids, exclusivamente una opción.');
        }

        return DB::transaction(function () use ($ids, $timezone, $apply, $all, $reverse): array {
            $query = DB::table('validity_times')->orderBy('id');
            $all ? $query->where('type', 'fixed_window') : $query->whereIn('id', $ids);
            if ($apply) {
                $query->lockForUpdate();
            }
            $rows = $query->get();
            if (! $all && $rows->count() !== count(array_unique($ids))) {
                throw new InvalidArgumentException('Uno o más IDs no existen.');
            }
            if ($rows->contains(fn ($row): bool => $row->type !== 'fixed_window')) {
                throw new InvalidArgumentException('Sólo se admiten IDs de fixed_window.');
            }
            $source = $reverse ? 'UTC' : $timezone;
            $target = $reverse ? $timezone : 'UTC';
            $result = [];
            foreach ($rows as $row) {
                $convert = fn (?string $value): ?string => $value === null
                    ? null
                    : CarbonImmutable::parse($value, $source)->setTimezone($target)->format('Y-m-d H:i:s');
                $start = $convert($row->fixed_starts_at);
                $end = $convert($row->fixed_expires_at);
                $result[] = [
                    'id' => $row->id,
                    'original_start' => $row->fixed_starts_at,
                    'original_end' => $row->fixed_expires_at,
                    'result_start' => $start,
                    'result_end' => $end,
                ];
                if ($apply) {
                    DB::table('validity_times')->where('id', $row->id)->update([
                        'fixed_starts_at' => $start,
                        'fixed_expires_at' => $end,
                    ]);
                }
            }

            return $result;
        });
    }
}