<?php

namespace App\Filament\Imports;

use App\Models\Plant;
use App\Models\ProductionOrder;
use Carbon\Carbon;
use Filament\Actions\Imports\Exceptions\RowImportFailedException;
use Filament\Actions\Imports\ImportColumn;
use Filament\Actions\Imports\Importer;
use Filament\Actions\Imports\Models\Import;
use Str;

class ProductionOrderImporter extends Importer
{
    protected static ?string $model = ProductionOrder::class;

    public static function getColumns(): array
    {
        return [
            ImportColumn::make('plant')
                ->requiredMapping()
                ->label('PLANT CODE')
                ->exampleHeader('PLANT CODE')
                ->example('1000')
                ->relationship(resolveUsing: 'code')
                ->rules(['required']),
            ImportColumn::make('item')
                ->requiredMapping()
                ->label('ITEM CODE')
                ->exampleHeader('ITEM CODE')
                ->example('123456')
                ->relationship(resolveUsing: 'code')
                ->rules(['required']),
            ImportColumn::make('quantity')
                ->label('QUANTITY')
                ->exampleHeader('QUANTITY')
                ->example('3')
                ->rules(['required']),
            ImportColumn::make('start_date')
                ->label('START DATETIME')
                ->exampleHeader('START DATETIME')
                ->example('2026-04-30 10:00:00')
                ->rules(['required']),
            ImportColumn::make('end_date')
                ->label('END DATETIME')
                ->exampleHeader('END DATETIME')
                ->example('2026-05-30 10:00:00')
                ->rules(['required']),
            ImportColumn::make('production_order')
                ->label('PRODUCTION ORDER')
                ->exampleHeader('PRODUCTION ORDER')
                ->example('260116180001')
                ->rules(['required']),
            ImportColumn::make('from_serial_number')
                ->label('FROM SERIAL NUMBER')
                ->exampleHeader('FROM SERIAL NUMBER')
                ->example('1000211260400001')
                ->rules(['required']),
            ImportColumn::make('to_serial_number')
                ->label('TO SERIAL NUMBER')
                ->exampleHeader('TO SERIAL NUMBER')
                ->example('1000211260400003')
                ->rules(['required']),
            ImportColumn::make('created_by')
                ->label('CREATED BY')
                ->exampleHeader('CREATED BY')
                ->example('USER00001')
                ->rules(['required']),
            ImportColumn::make('updated_by')
                ->label('UPDATED BY')
                ->exampleHeader('UPDATED BY')
                ->example('USER00001')
                ->rules(['required']),
        ];
    }

    public function resolveRecord(): ?ProductionOrder
    {
        $warnMsg = [];
        $plant = null;
        $plantCod = trim($this->data['plant']) ?? '';
        $plantId = null;
        $item = null;
        $itemCod = trim($this->data['item']) ?? '';
        $itemId = null;
        $qnty = trim($this->data['quantity']) ?? '';
        $startAt = trim($this->data['start_date']) ?? '';
        $endAt = trim($this->data['end_date']) ?? '';
        $prodOrd = trim($this->data['production_order']) ?? '';
        $fromSerNo = trim($this->data['from_serial_number']) ?? '';
        $toSerNo = trim($this->data['to_serial_number']) ?? '';
        $createdBy = trim($this->data['created_by']) ?? '';
        $updatedBy = trim($this->data['updated_by']) ?? '';

        if ($qnty) {
            if ($plantCod == null || $plantCod == '') {
                $warnMsg[] = "Plant code can't be empty!";
            } elseif (! is_numeric($plantCod)) {
                $warnMsg[] = 'Plant code should contain only numeric values!';
            } elseif (Str::length($plantCod) < 4 || Str::length($plantCod) > 7) {
                $warnMsg[] = 'Plant code must be between 4 and 7 digits only!';
            } elseif (! preg_match('/^[1-9]\d{6,}$/', $plantCod)) {
                $warnMsg[] = 'Invalid plant code found!';
            }

            $dupProd = ProductionOrder::where('production_order', $prodOrd)->first(); // where('plant_id', $plantId)->
            if ($dupProd) {
                $warnMsg[] = "Production Order '{$prodOrd}' already exists in database!";
            }

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

            $now = Carbon::now();
            $plantId = $plantCod ?? null;
            $quantity = $qnty ?? null;
            $plantCode = Plant::find($plantId)->code;

            $year = $now->format('y'); // Year (last 2 digits)
            $month = $now->format('m');

            $monthText = strtoupper($now->format('M')); // APR
            $monthNumber = '';

            foreach (str_split($monthText) as $char) {
                $curSeq = ord($char) - 64;
                $monthNumber .= str_pad($curSeq, 2, '0', STR_PAD_LEFT);
            }

            $prefix = $year.$monthNumber;

            $last = ProductionOrder::where('production_order', 'like', "{$prefix}%")->orderByDesc('production_order')->first(); // ProductionOrder::where('production_order', 'like', $prefix.'%')->orderBy('production_order', 'desc')->first();

            if ($last) {
                $lastSeq = substr($last->production_order, -4);
                $nextSeq = str_pad(((int) $lastSeq + 1), 4, '0', STR_PAD_LEFT);
            } else {
                $nextSeq = '0001';
            }

            $productionOrder = $prefix.$nextSeq;

            $prefixSerial = $plantCode.$year.$month;

            $last = ProductionOrder::where('to_serial_number', 'like', "{$prefixSerial}%")->orderByDesc('to_serial_number')->first();

            if ($last) {
                $lastSeq = (int) substr($last->to_serial_number, -6);
                $startSeq = $lastSeq + 1;
            } else {
                $startSeq = 1;
            }

            $endSeq = $startSeq + $quantity - 1;

            $fromSerial = $prefixSerial.str_pad($startSeq, 6, '0', STR_PAD_LEFT);
            $toSerial = $prefixSerial.str_pad($endSeq, 6, '0', STR_PAD_LEFT);
        }
        // return ProductionOrder::firstOrNew([
        //     // Update existing records, matching them by `$this->data['column_name']`
        //     'email' => $this->data['email'],
        // ]);

        return new ProductionOrder;
    }

    public static function getCompletedNotificationBody(Import $import): string
    {
        $body = 'Your production order import has completed and '.number_format($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;
    }
}