<?php

namespace App\Services\Import;

use App\Models\Dictionary\Area;
use App\Models\Dictionary\District;
use Exception;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use PhpOffice\PhpSpreadsheet\IOFactory;

class ImportAreasService
{
    private array $logs = [];
    private array $districtCache = [];

    public function __construct(
        private readonly string $filePath,
        private readonly int $userId,
    ) {}

    public function handle(): array
    {
        try {
            $this->log("Начало импорта справочника районов");

            // Загружаем кэш округов
            $this->loadDistrictCache();

            DB::beginTransaction();

            try {
                $spreadsheet = IOFactory::load($this->filePath);
                $sheet = $spreadsheet->getActiveSheet();

                $highestRow = $sheet->getHighestRow();
                $imported = 0;
                $updated = 0;
                $skipped = 0;

                for ($row = 2; $row <= $highestRow; $row++) {
                    $id = trim($sheet->getCell('A' . $row)->getValue());
                    $name = trim($sheet->getCell('B' . $row)->getValue());
                    $districtShortname = trim($sheet->getCell('C' . $row)->getValue());
                    $districtId = trim($sheet->getCell('D' . $row)->getValue());

                    // Пропускаем пустые строки
                    if (empty($name)) {
                        $skipped++;
                        continue;
                    }

                    // Определяем округ
                    $foundDistrictId = null;

                    // Сначала по ID округа
                    if (!empty($districtId) && is_numeric($districtId)) {
                        $foundDistrictId = (int) $districtId;
                        if (!isset($this->districtCache[$foundDistrictId])) {
                            $this->log("Строка {$row}: округ с ID {$districtId} не найден");
                            $foundDistrictId = null;
                        }
                    }

                    // Потом по сокращению
                    if (!$foundDistrictId && !empty($districtShortname)) {
                        foreach ($this->districtCache as $dId => $dShortname) {
                            if (mb_strtolower($dShortname) === mb_strtolower($districtShortname)) {
                                $foundDistrictId = $dId;
                                break;
                            }
                        }
                        if (!$foundDistrictId) {
                            $this->log("Строка {$row}: округ '{$districtShortname}' не найден");
                        }
                    }

                    if (!$foundDistrictId) {
                        $this->log("Строка {$row}: пропущена (не найден округ)");
                        $skipped++;
                        continue;
                    }

                    $data = [
                        'name' => $name,
                        'district_id' => $foundDistrictId,
                    ];

                    // Если есть ID, ищем по нему
                    if (!empty($id) && is_numeric($id)) {
                        $area = Area::withTrashed()->find((int) $id);
                        if ($area) {
                            if ($area->trashed()) {
                                $area->restore();
                            }
                            $area->update($data);
                            $updated++;
                            continue;
                        }
                    }

                    // Ищем по названию и округу
                    $area = Area::withTrashed()
                        ->where('name', $name)
                        ->where('district_id', $foundDistrictId)
                        ->first();

                    if ($area) {
                        if ($area->trashed()) {
                            $area->restore();
                        }
                        $area->update($data);
                        $updated++;
                    } else {
                        Area::create($data);
                        $imported++;
                    }
                }

                DB::commit();
                $this->log("Импорт районов: создано {$imported}, обновлено {$updated}, пропущено {$skipped}");

                return [
                    'success' => true,
                    'imported' => $imported,
                    'updated' => $updated,
                    'skipped' => $skipped,
                    'logs' => $this->logs,
                ];
            } catch (Exception $e) {
                DB::rollBack();
                throw $e;
            }
        } catch (Exception $e) {
            $this->log("ОШИБКА: " . $e->getMessage());
            Log::error("Ошибка импорта районов: " . $e->getMessage(), [
                'trace' => $e->getTraceAsString(),
            ]);

            return [
                'success' => false,
                'error' => $e->getMessage(),
                'logs' => $this->logs,
            ];
        }
    }

    private function loadDistrictCache(): void
    {
        $this->districtCache = District::pluck('shortname', 'id')->toArray();
    }

    private function log(string $message): void
    {
        $this->logs[] = '[' . date('H:i:s') . '] ' . $message;
        Log::info($message);
    }

    public function getLogs(): array
    {
        return $this->logs;
    }
}