Add harvest and generic imports

app/Service/Import/Importers/HarvestClientsImporter.php

@@ -0,0 +1,76 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service\Import\Importers;
+
+use Exception;
+use League\Csv\Exception as CsvException;
+use League\Csv\Reader;
+
+class HarvestClientsImporter extends DefaultImporter
+{
+    /**
+     * @var array<string>
+     */
+    private const array REQUIRED_FIELDS = [
+        'Client Name',
+    ];
+
+    /**
+     * @throws ImportException
+     */
+    #[\Override]
+    public function importData(string $data, string $timezone): void
+    {
+        try {
+            $reader = Reader::createFromString($data);
+            $reader->setHeaderOffset(0);
+            $reader->setDelimiter(',');
+            $reader->setEnclosure('"');
+            $reader->setEscape('');
+            $header = $reader->getHeader();
+            $this->validateHeader($header);
+            $records = $reader->getRecords();
+            foreach ($records as $record) {
+                $this->clientImportHelper->getKey([
+                    'name' => $record['Client Name'],
+                    'organization_id' => $this->organization->id,
+                ]);
+            }
+        } catch (ImportException $exception) {
+            throw $exception;
+        } catch (CsvException $exception) {
+            throw new ImportException('Invalid CSV data');
+        } catch (Exception $exception) {
+            report($exception);
+            throw new ImportException('Unknown error');
+        }
+    }
+
+    /**
+     * @param  array<string>  $header
+     *
+     * @throws ImportException
+     */
+    private function validateHeader(array $header): void
+    {
+        foreach (self::REQUIRED_FIELDS as $requiredField) {
+            if (! in_array($requiredField, $header, true)) {
+                throw new ImportException('Invalid CSV header, missing field: '.$requiredField);
+            }
+        }
+    }
+
+    #[\Override]
+    public function getName(): string
+    {
+        return __('importer.harvest_clients.name');
+    }
+
+    #[\Override]
+    public function getDescription(): string
+    {
+        return __('importer.harvest_clients.description');
+    }
+}