<?php

namespace App\Imports;

use App\Enums\ShipmentType;
use App\Models\ShippingRate;
use Maatwebsite\Excel\Concerns\OnEachRow;
use Maatwebsite\Excel\Concerns\WithMultipleSheets;
use Maatwebsite\Excel\Concerns\WithStartRow;
use Maatwebsite\Excel\Row;

class ShippingRatesImport implements WithMultipleSheets
{
    public function sheets(): array
    {
        return [
            'Export Rate' => new RateSheetImport('export'),
            'Import Rate' => new RateSheetImport('import'),
            'DocEco' => new SimpleRateSheetImport(ShipmentType::DocEconomy, 'export'),
        ];
    }
}

class RateSheetImport implements OnEachRow, WithStartRow
{
    protected int $imported = 0;
    protected int $skipped = 0;
    protected array $errors = [];

    public function __construct(protected string $direction) {}

    public function startRow(): int
    {
        return 5;
    }

    public function onRow(Row $row)
    {
        $rowIndex = $row->getIndex();
        $cells = $row->toArray();

        if (empty($cells[0]) || !is_numeric($cells[0])) {
            $this->skipped++;
            return;
        }

        try {
            $type = $this->resolveType($rowIndex, $cells);

            $zones = [];
            for ($i = 1; $i <= 10; $i++) {
                $val = str_replace([',', ' '], '', (string) ($cells[$i] ?? 0));
                $zones['zone_' . $i] = is_numeric($val) ? (float) $val : 0;
            }

            ShippingRate::updateOrCreate(
                [
                    'direction' => $this->direction,
                    'type' => $type->value,
                    'weight' => (float) $cells[0],
                ],
                $zones
            );

            $this->imported++;
        } catch (\Throwable $e) {
            $this->errors[] = "Row $rowIndex: " . $e->getMessage();
            $this->skipped++;
        }
    }

    public function getStats(): array
    {
        return [
            'imported' => $this->imported,
            'skipped' => $this->skipped,
            'errors' => $this->errors,
        ];
    }

    private function resolveType(int $rowIndex, array $cells): ShipmentType
    {
        $header = strtoupper((string) ($cells[3] ?? ''));

        if (str_contains($header, 'DOCUMENT') || str_contains($header, 'DOC')) {
            return ShipmentType::DocNormal;
        }

        if (str_contains($header, 'NON') || str_contains($header, 'PARCEL')) {
            return ShipmentType::Parcel;
        }

        return $rowIndex < 10 ? ShipmentType::DocNormal : ShipmentType::Parcel;
    }
}

class SimpleRateSheetImport implements OnEachRow, WithStartRow
{
    protected int $imported = 0;
    protected int $skipped = 0;
    protected array $errors = [];

    public function __construct(
        protected ShipmentType $type,
        protected string $direction = 'export'
    ) {}

    public function startRow(): int
    {
        return 2;
    }

    public function onRow(Row $row)
    {
        $cells = $row->toArray();

        if (empty($cells[0]) || !is_numeric($cells[0])) {
            $this->skipped++;
            return;
        }

        try {
            $weight = (float) $cells[0];
            $zoneNumber = (int) $cells[1];
            $rawValue = str_replace([',', ' '], '', (string) ($cells[2] ?? 0));
            $value = is_numeric($rawValue) ? (float) $rawValue : 0;

            if ($zoneNumber < 1 || $zoneNumber > 10 || $value <= 0) {
                $this->skipped++;
                return;
            }

            $zoneColumn = 'zone_' . $zoneNumber;

            $defaults = [];
            for ($i = 1; $i <= 10; $i++) {
                $defaults['zone_' . $i] = 0;
            }

            $record = ShippingRate::firstOrCreate(
                [
                    'direction' => $this->direction,
                    'type' => $this->type->value,
                    'weight' => $weight,
                ],
                $defaults
            );

            $record->{$zoneColumn} = $value;
            $record->save();

            $this->imported++;
        } catch (\Throwable $e) {
            $this->errors[] = "Row " . $row->getIndex() . ": " . $e->getMessage();
            $this->skipped++;
        }
    }

    public function getStats(): array
    {
        return [
            'imported' => $this->imported,
            'skipped' => $this->skipped,
            'errors' => $this->errors,
        ];
    }
}