<?php
namespace Shopkeeper\VendorNotes\Setup;

use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\UpgradeDataInterface;
use Magento\Framework\App\Config\Storage\WriterInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\Serialize\Serializer\Json;

class UpgradeData implements UpgradeDataInterface
{
    protected $configWriter;
    protected $scopeConfig;
    protected $json;

    public function __construct(
        WriterInterface $configWriter,
        ScopeConfigInterface $scopeConfig,
        Json $json
    ) {
        $this->configWriter = $configWriter;
        $this->scopeConfig = $scopeConfig;
        $this->json = $json;
    }

    public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $setup->startSetup();

        // Migrate from old individual fields to new dynamic rows format
        if (version_compare($context->getVersion(), '1.1.0', '<')) {
            $this->migrateToVendorMapping();
        }

        $setup->endSetup();
    }

    /**
     * Migrate old configuration to new vendor mapping format
     */
    protected function migrateToVendorMapping()
    {
        // Define the old configuration paths and their corresponding vendor names
        $oldConfigs = [
            'vendor_notes/general/thermo_fisher_note' => 'Thermo Fisher',
            'vendor_notes/general/orion_note' => 'Orion',
            'vendor_notes/general/nalgene_note' => 'Nalgene',
            'vendor_notes/general/thermo_fisher_parts_note' => 'Thermo Fisher Parts'
        ];

        $vendorMapping = [];

        foreach ($oldConfigs as $configPath => $vendorName) {
            $note = $this->scopeConfig->getValue($configPath);
            
            if ($note) {
                $vendorMapping[] = [
                    'vendor_name' => $vendorName,
                    'note' => $note
                ];
            }
        }

        // Save the new mapping if we have data
        if (!empty($vendorMapping)) {
            $serializedMapping = $this->json->serialize($vendorMapping);
            $this->configWriter->save(
                'vendor_notes/general/vendor_mapping',
                $serializedMapping
            );
        }
    }
}