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1<?php
2
3namespace App\Services\ImportExport;
4
5use Illuminate\Database\Eloquent\Model;
6use Maatwebsite\Excel\Concerns\FromQuery;
7use Maatwebsite\Excel\Concerns\WithHeadings;
8use Maatwebsite\Excel\Concerns\WithMapping;
9
10/**
11 * A generic spreadsheet export driven by a Definition. Streams straight from
12 * the query, so large tables don't blow memory.
13 */
14class Exporter implements FromQuery, WithHeadings, WithMapping
15{
16    public function __construct(
17        private readonly Definition $definition,
18        private readonly array $filters = [],
19    ) {}
20
21    public function query()
22    {
23        return $this->definition->applyFilters($this->definition->query(), $this->filters);
24    }
25
26    public function headings(): array
27    {
28        return $this->definition->headings();
29    }
30
31    /** @param  Model  $row */
32    public function map($row): array
33    {
34        $out = [];
35        foreach ($this->definition->resolvedColumns() as $key => $col) {
36            $out[] = isset($col['export'])
37                ? $col['export']($row)
38                : data_get($row, $key);
39        }
40
41        return $out;
42    }
43}