<?php

namespace App\Filament\Imports;

use App\Models\Item;
use App\Models\Plant;
use App\Models\SaleOrderMaster;
use Filament\Actions\Imports\Exceptions\RowImportFailedException;
use Filament\Actions\Imports\ImportColumn;
use Filament\Actions\Imports\Importer;
use Filament\Actions\Imports\Models\Import;
use Filament\Facades\Filament;
use Str;

class SaleOrderMasterImporter extends Importer
{
    protected static ?string $model = SaleOrderMaster::class;

    protected array $importedSaleOrders = [];

    public static function getColumns(): array
    {
        return [
            ImportColumn::make('plant')
                ->requiredMapping()
                ->exampleHeader('Plant Code')
                ->example('1000')
                ->label('Plant Code')
                ->relationship(resolveUsing: 'code')
                ->rules(['required']),
            ImportColumn::make('item')
                ->requiredMapping()
                ->exampleHeader('Item Code')
                ->example('630214')
                ->label('Item Code')
                ->relationship(resolveUsing: 'code')
                ->rules(['required']),
            ImportColumn::make('sale_order_number')
                ->requiredMapping()
                ->exampleHeader('Sale Order Number')
                ->example('1JA0029512')
                ->label('Sale Order Number')
                ->rules(['required']),
            ImportColumn::make('supplier_name')
                ->exampleHeader('Supplier Name')
                ->example('ABC Supplier')
                ->label('Supplier Name'),
            ImportColumn::make('quantity')
                ->exampleHeader('Quantity')
                ->example('100')
                ->label('Quantity'),
        ];
    }

    public function resolveRecord(): ?SaleOrderMaster
    {
        $warnMsg = [];
        $plantCod = $this->data['plant'];
        $plant = null;
        $item = null;
        $saleOrder = trim($this->data['sale_order_number']);
        $supplierName = trim($this->data['supplier_name']);

        if (Str::length($plantCod) < 4 || ! is_numeric($plantCod) || ! preg_match('/^[1-9]\d{3,}$/', $plantCod)) {
            $warnMsg[] = 'Invalid plant code found';
        } else {
            $plant = Plant::where('code', $plantCod)->first();
            if (! $plant) {
                $warnMsg[] = 'Plant not found';
            } else {
                $item = Item::where('code', $this->data['item'])->where('plant_id', $plant->id)->first();
            }
            if (! $item) {
                $warnMsg[] = 'Item not found';
            }
        }

        if (Str::length($this->data['sale_order_number']) < 9) {
            $warnMsg[] = 'Invalid Sale Order number found';
        }

        if (empty($this->data['sale_order_number'])) {
            $warnMsg[] = 'Sale Order Number cannot be empty.';
        }

        if (empty($this->data['supplier_name'])) {
            $warnMsg[] = 'Supplier Name cannot be empty.';
        }

        if (empty($this->data['quantity'])) {
            $warnMsg[] = 'Quantity cannot be empty.';
        }

        if (! is_numeric($this->data['quantity'])) {
            $warnMsg[] = 'Quantity must be a number.';
        }

        if (isset($this->importedSaleOrders[$saleOrder])) {

            if (strtolower(trim($this->importedSaleOrders[$saleOrder])) != strtolower($supplierName)){
                $warnMsg[] = "Sale Order '{$saleOrder}' has multiple supplier names in the import file.";
            }
        }
        else {
            $this->importedSaleOrders[$saleOrder] = $supplierName;
        }

        $existingPo = SaleOrderMaster::where('plant_id', $plant->id)->where('sale_order_number', $this->data['sale_order_number'])->first();

        if ($existingPo && trim(strtolower($existingPo->supplier_name)) != trim(strtolower($this->data['supplier_name'])))
        {
            $warnMsg[] =  "Sale Order '{$this->data['sale_order_number']}' is already mapped to supplier '{$existingPo->supplier_name}'.";
        }

        $existingPoItem = SaleOrderMaster::where('plant_id', $plant->id)->where('item_id', $item->id)->where('sale_order_number', $this->data['sale_order_number'])->where('supplier_name', $this->data['supplier_name'])->first();

        if ($existingPoItem)
        {
            $warnMsg[] =  "Sale Order '{$this->data['sale_order_number']}' is already exist with item code '{$this->data['item']}' and supplier name '{$this->data['supplier_name']}'.";
        }

        $user = Filament::auth()->user();

        $operatorName = $user->name;

        if (! empty($warnMsg)) {
            throw new RowImportFailedException(implode(', ', $warnMsg));
        }

        SaleOrderMaster::updateOrCreate([
            'plant_id' => $plant->id,
            'item_id' => $item->id,
            'sale_order_number' => $this->data['sale_order_number'],
            'supplier_name' => $this->data['supplier_name'],
            'quantity' => $this->data['quantity'] ?? null,
            'created_by' => $operatorName,
            'updated_by' => $operatorName,
        ]);

        return null;
    }

    public static function getCompletedNotificationBody(Import $import): string
    {
        $body = 'Your sale order master import has completed and ' . number_format($import->successful_rows) . ' ' . str('row')->plural($import->successful_rows) . ' imported.';

        if ($failedRowsCount = $import->getFailedRowsCount()) {
            $body .= ' ' . number_format($failedRowsCount) . ' ' . str('row')->plural($failedRowsCount) . ' failed to import.';
        }

        return $body;
    }
}