<?php

namespace Bcs\CategoryChecker;

use Bcs\Databaseinterface\SqlSrvClient;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
use PhpOffice\PhpSpreadsheet\Style\Alignment;

class CategoryChecker
{
    /**
     * CategoryChecker constructor.
     *
     * @param SqlSrvClient $sqlSrvClient The SQL Server client
     * @param string       $csvFilePath  The path to the CSV file
     */
    public function __construct(
        private SqlSrvClient $sqlSrvClient,
        private string $csvFilePath
    ) {
    }

    /**
     * Fetch master categories from MSSQL
     *
     * @return array
     */
    public function fetchMasterCategories(): array
    {
        // Placeholder for the SQL query to select items from MSSQL
        $sql = "SELECT ITEM_NO,
        DESCR,
        USR_MAG_CATEG_1,
        USR_MAG_CATEG_2,
        USR_MAG_CATEG_3,
        USR_MAG_CATEG_4,
        USR_MAG_CATEG_5,
        USR_MAG_CATEG_6
        FROM IM_ITEM i
        where (descr like 'gog%' or descr like 'lens%') and ATTR_COD_3!='d9999' order by DESCR";
        $rows = $this->sqlSrvClient->query($sql);

        $masterData = [];
        foreach ($rows as $row) {
            $sku = $row['ITEM_NO'];
            $categories = array_values(
                array_filter(
                    array_map(
                        fn($value) =>
                            // Check if the category ends with '.html' and remove it
                        str_ends_with($value, '.html') ? substr($value, 0, -5) : $value,
                        $row
                    ),
                    fn($value, $key) =>
                    // Keep only non-empty category values and keys that start with 'category'
                    str_starts_with($key, 'USR_MAG_CATEG_') && !empty($value),
                    ARRAY_FILTER_USE_BOTH
                )
            );

            $masterData[$sku] = $categories;
        }

        return $masterData;
    }

    /**
     * Load categories from CSV file
     *
     * @return array
     */
    public function loadCsvCategories(): array
    {
        $csvData = [];
        if (($handle = fopen($this->csvFilePath, "r")) !== false) {
            while (($data = fgetcsv($handle, 1000, ",")) !== false) {
                //sku, name, category.path
                $sku = $data[0];
                $categories = explode(";", $data[2]);
                $csvData[$sku] = $categories;
            }
            fclose($handle);
        }

        return $csvData;
    }

    /**
     * Compare categories between the two systems
     *
     * @return array
     */
    public function compareCategories(): array
    {
        $masterData = $this->fetchMasterCategories();
        $csvData = $this->loadCsvCategories();
        $mismatches = [];

        foreach ($masterData as $sku => $masterCategories) {
            // If the SKU does not exist in the CSV data, skip it
            if (!isset($csvData[$sku])) {
                continue; // Skip to the next SKU since this one might not be synced yet
            }

            $csvCategories = $csvData[$sku];
            $diffMasterToCsv = array_diff($masterCategories, $csvCategories);
            $diffCsvToMaster = array_diff($csvCategories, $masterCategories);

            if ($diffMasterToCsv !== [] || $diffCsvToMaster !== []) {
                // There are mismatches between the categories
                $mismatches[$sku] = ['master' => $diffMasterToCsv, 'csv' => $diffCsvToMaster];
            }
        }

        return $mismatches;
    }

    /**
     * Output the mismatches to the console
     *
     * @return void
     */
    public function outputMismatches(): void
    {
        $mismatches = $this->compareCategories();
        foreach ($mismatches as $sku => $mismatch) {
            echo "SKU: {$sku}\n";
            echo "Counterpoint only categories: " . implode(", ", $mismatch['master']) . "\n";
            echo "Magento only categories: " . implode(", ", $mismatch['csv']) . "\n";
            echo "-----------------------------------\n";
        }
    }

    /**
     * Output the mismatches as an XLSX file
     *
     * @param  string $outputFilePath The path to the output file
     * @return void
     */
    public function outputMismatchesAsXlsx(string $outputFilePath): void
    {
        $mismatches = $this->compareCategories();

        $spreadsheet = new Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();

        // Set the header
        $sheet->setCellValue('A1', 'SKU');
        $sheet->setCellValue('B1', 'Counterpoint Only Categories');
        $sheet->setCellValue('C1', 'Magento Only Categories');
        $sheet->getStyle('A1:C1')->getAlignment()->setHorizontal(Alignment::HORIZONTAL_CENTER);
        $sheet->getStyle('A1:C1')->getFont()->setBold(true);

        $row = 2; // Start from the second row to leave space for the header
        foreach ($mismatches as $sku => $mismatch) {
            $sheet->setCellValue('A' . $row, $sku);
            $sheet->setCellValue('B' . $row, implode(", ", $mismatch['master']));
            $sheet->setCellValue('C' . $row, implode(", ", $mismatch['csv']));
            $row++;
        }

        // Auto size columns for content
        foreach (range('A', 'C') as $columnID) {
            $sheet->getColumnDimension($columnID)->setAutoSize(true);
        }

        $writer = new Xlsx($spreadsheet);
        $writer->save($outputFilePath);
    }

    /**
     * Output the missing categories as a CSV file
     *
     * @param string $outputFilePath
     */
    public function outputMissingCategoriesAsCsv(string $outputFilePath): void
    {
        $mismatches = $this->compareCategories();

        if (($handle = fopen($outputFilePath, 'w')) !== false) {
            foreach ($mismatches as $sku => $missingCategories) {
                foreach ($missingCategories['csv'] as $category) {
                    fputcsv($handle, ['-CCP', $category, $sku]);
                }
            }
            fclose($handle);
        }
    }
}