<?php

namespace App\Services;

use App\Models\Import;
use App\Models\Product;
use Exception;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
use PhpOffice\PhpSpreadsheet\Worksheet\RowIterator;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;

class ImportBaseService
{
    protected array $headers = [];
    protected Worksheet $sheet;
    protected RowIterator $rowIterator;

    public function __construct(protected readonly Import $import)
    {}

    public function readFile(): void
    {
        $path = Storage::disk('upload')->path($this->import->filename);
        $reader = new Xlsx();
        $spreadsheet = $reader->load($path);
        $this->sheet = $spreadsheet->getActiveSheet();
        $this->rowIterator = $this->sheet->getRowIterator();
    }

    protected function rowToArray($row): array
    {
        $cellIterator = $row->getCellIterator();
        $cellIterator->setIterateOnlyExistingCells(FALSE);
        $row_content = [];
        $keys = array_values($this->headers);

        $i = 0;
        foreach ($cellIterator as $cell) {
            if (isset($keys[$i])) {
                $row_content[$keys[$i]] = $cell->getValue();
            }
            $i++;
        }

        return $row_content;
    }

    /**
     * @param array $headers
     * @return bool
     */
    protected function checkHeaders(array $headers): bool
    {
        foreach ($headers as $k => $header) {
            $headers[$k] = Str::before($header, "\n");
        }

        return $headers == array_keys($this->headers);
    }

    protected function findId(string $tableNameCol, string $value): string
    {
        list($table, $column) = explode('.', $tableNameCol);
        $model = DB::table($table)
            ->where($column, $value)
            ->first();
        if (!$model) {
            echo $this->import->log("SKIP: no {$tableNameCol} {$value} found!", 'WARNING');
        }
        return $model?->id ?? '';
    }

    protected function prepare(): bool
    {
        try {
            $this->import->log('Reading file...');
            $this->readFile();
        } catch (Exception $exception){
            $this->import->log($exception->getMessage(), 'ERROR');
            $this->import->status = 'ERROR';
            $this->import->save();
            return false;
        }

        try {
            $this->import->log('Checking headers...');
            $headers = $this->rowToArray($this->rowIterator->current());
            if (!$this->checkHeaders(array_values($headers))) {
                throw new Exception("Invalid headers");
            }
        } catch (Exception $exception){
            $this->import->log($exception->getMessage(), 'ERROR');
            $this->import->status = 'ERROR';
            $this->import->save();
            return false;
        }
        return true;
    }
}