<?php

namespace Modules\MasterData\Imports;

use Illuminate\Support\Collection;
use Illuminate\Support\Str;
use Maatwebsite\Excel\Concerns\ToCollection;
use Maatwebsite\Excel\Concerns\WithHeadingRow;
use Maatwebsite\Excel\Concerns\WithValidation;
use Maatwebsite\Excel\Concerns\SkipsOnFailure;
use Maatwebsite\Excel\Concerns\SkipsFailures;
use Modules\MasterData\Models\Material;
use Modules\MasterData\Models\MaterialGroup;

class MaterialImport implements ToCollection, WithHeadingRow, WithValidation, SkipsOnFailure
{
    use SkipsFailures;

    private int $importedCount = 0;
    private int $skippedCount = 0;
    private array $groupsCreated = [];

    public function collection(Collection $rows): void
    {
        foreach ($rows as $row) {
            // Skip completely empty rows
            if (empty($row['name'])) {
                continue;
            }

            $sku = $row['sku'] ?? null;
            $name = $row['name'];

            $matchAttributes = [];
            if (!empty($sku)) {
                $matchAttributes['sku'] = $sku;
            } else {
                $matchAttributes['name'] = $name;
            }

            $material = Material::updateOrCreate(
                $matchAttributes,
                [
                    'name' => $name,
                    'sku' => $sku,
                    'category' => $row['category'] ?? null,
                    'unit' => $row['unit'] ?? 'pcs',
                    'unit_cost' => $row['unit_cost'] ?? 0,
                    'description' => $row['description'] ?? null,
                ]
            );

            // Handle group assignment
            $groupName = trim($row['group'] ?? '');
            if ($groupName) {
                $group = MaterialGroup::firstOrCreate(
                    ['name' => $groupName],
                    ['description' => "Auto-created from import"]
                );

                $group->materials()->syncWithoutDetaching([$material->id]);

                if (!in_array($groupName, $this->groupsCreated)) {
                    $this->groupsCreated[] = $groupName;
                }
            }

            $this->importedCount++;
        }
    }

    public function rules(): array
    {
        return [
            'name' => 'required|string|max:255',
            'sku' => 'nullable|string|max:50',
            'category' => 'nullable|string|max:50',
            'unit' => 'nullable|string|max:20',
            'unit_cost' => 'nullable|numeric|min:0',
            'description' => 'nullable|string',
            'group' => 'nullable|string|max:255',
        ];
    }

    public function getImportedCount(): int
    {
        return $this->importedCount;
    }

    public function getSkippedCount(): int
    {
        return $this->skippedCount;
    }

    public function getGroupsCreated(): array
    {
        return $this->groupsCreated;
    }
}