<?php

namespace App\Exports;

use App\Models\Dealer;
use App\Models\Product;
use Maatwebsite\Excel\Concerns\FromCollection;
use Maatwebsite\Excel\Concerns\WithMultipleSheets;
use Maatwebsite\Excel\Concerns\WithTitle;
use Maatwebsite\Excel\Concerns\WithHeadings;
use Maatwebsite\Excel\Concerns\WithStyles;
use Maatwebsite\Excel\Concerns\WithColumnWidths;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
use PhpOffice\PhpSpreadsheet\Style\Alignment;
use PhpOffice\PhpSpreadsheet\Style\Border;
use PhpOffice\PhpSpreadsheet\Style\Fill;

class ProductStockDealers implements WithMultipleSheets
{
    public function sheets(): array
    {
        $sheets = [];
        $usedNames = [];
        
        // Get all dealers with their stock data
        $dealers = Dealer::with(['stocks.product.category'])->get();
        
        /** @var Dealer $dealer */
        foreach ($dealers as $dealer) {
            $dealerSheet = new DealerStockSheet($dealer);
            $sheetTitle = $dealerSheet->title();
            
            // Handle duplicate sheet names
            $originalTitle = $sheetTitle;
            $counter = 1;
            while (in_array($sheetTitle, $usedNames)) {
                $sheetTitle = substr($originalTitle, 0, 28) . '_' . $counter;
                $counter++;
            }
            $usedNames[] = $sheetTitle;
            
            // Set the unique title
            $dealerSheet->setUniqueTitle($sheetTitle);
            $sheets[] = $dealerSheet;
        }
        
        return $sheets;
    }
}

class DealerStockSheet implements FromCollection, WithTitle, WithHeadings, WithStyles, WithColumnWidths
{
    protected $dealer;
    protected $uniqueTitle;
    
    public function __construct(Dealer $dealer)
    {
        $this->dealer = $dealer;
    }
    
    public function collection()
    {
        // Get all products with stock for this dealer
        $stocks = $this->dealer->stocks()
            ->with(['product.category'])
            ->whereHas('product', function($query) {
                $query->where('active', true);
            })
            ->get();
        
        $data = collect();
        $no = 1;
        
        foreach ($stocks as $stock) {
            $product = $stock->product;
            $data->push([
                'no' => $no++,
                'kode_produk' => $product->code,
                'nama_produk' => $product->name,
                'kategori' => $product->category ? $product->category->name : '-',
                'satuan' => $product->unit ?? '-',
                'stok' => number_format($stock->quantity, 2)
            ]);
        }
        
        // If no stock, add empty row
        if ($data->isEmpty()) {
            $data->push([
                'no' => '-',
                'kode_produk' => '-',
                'nama_produk' => 'Tidak ada stok produk',
                'kategori' => '-',
                'satuan' => '-',
                'stok' => '0'
            ]);
        }
        
        return $data;
    }
    
    public function setUniqueTitle(string $title): void
    {
        $this->uniqueTitle = $title;
    }

    public function title(): string
    {
        if (isset($this->uniqueTitle)) {
            return $this->uniqueTitle;
        }
        
        // Clean dealer name for sheet title (remove invalid characters and handle edge cases)
        $cleanName = $this->dealer->name;
        
        // Remove parentheses and their contents
        $cleanName = preg_replace('/\([^)]*\)/', '', $cleanName);
        
        // Remove dots, commas, and other special characters
        $cleanName = preg_replace('/[^A-Za-z0-9\-_ ]/', '', $cleanName);
        
        // Clean up multiple spaces and trim
        $cleanName = preg_replace('/\s+/', ' ', trim($cleanName));
        
        // If name is empty after cleaning, use dealer ID
        if (empty($cleanName)) {
            $cleanName = 'Dealer_' . $this->dealer->id;
        }
        
        // Limit to 31 characters and ensure no leading/trailing spaces
        $cleanName = trim(substr($cleanName, 0, 31));
        
        // Ensure it doesn't end with a space (which can cause Excel issues)
        return rtrim($cleanName);
    }
    
    public function headings(): array
    {
        return [
            'No',
            'Kode Produk',
            'Nama Produk', 
            'Kategori',
            'Satuan',
            'Stok'
        ];
    }
    
    public function styles(Worksheet $sheet)
    {
        // Add dealer info at the top first
        $sheet->insertNewRowBefore(1, 2);
        $sheet->setCellValue('A1', 'STOK PRODUK DEALER: ' . strtoupper($this->dealer->name));
        $sheet->setCellValue('A2', 'Tanggal Export: ' . now()->format('d/m/Y H:i:s'));
        
        // Merge cells for dealer info
        $sheet->mergeCells('A1:F1');
        $sheet->mergeCells('A2:F2');
        
        $lastRow = $sheet->getHighestRow();
        
        // Style dealer info
        $sheet->getStyle('A1:A2')->applyFromArray([
            'font' => ['bold' => true, 'size' => 12],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER]
        ]);
        
        // Style headers (row 3 after inserting 2 rows)
        $sheet->getStyle('A3:F3')->applyFromArray([
            'font' => ['bold' => true, 'color' => ['rgb' => 'FFFFFF']],
            'fill' => ['fillType' => Fill::FILL_SOLID, 'startColor' => ['rgb' => '4472C4']],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER],
            'borders' => ['allBorders' => ['borderStyle' => Border::BORDER_THIN]]
        ]);
        
        // Style data rows if they exist
        if ($lastRow > 3) {
            $sheet->getStyle('A4:F' . $lastRow)->applyFromArray([
                'borders' => ['allBorders' => ['borderStyle' => Border::BORDER_THIN, 'color' => ['rgb' => 'CCCCCC']]],
                'alignment' => ['vertical' => Alignment::VERTICAL_CENTER]
            ]);
            
            // Center align specific columns
            $sheet->getStyle('A4:A' . $lastRow)->getAlignment()->setHorizontal(Alignment::HORIZONTAL_CENTER);
            $sheet->getStyle('E4:F' . $lastRow)->getAlignment()->setHorizontal(Alignment::HORIZONTAL_CENTER);
        }
        
        return $sheet;
    }
    
    public function columnWidths(): array
    {
        return [
            'A' => 8,   // No
            'B' => 15,  // Kode Produk
            'C' => 30,  // Nama Produk
            'D' => 20,  // Kategori
            'E' => 12,  // Satuan
            'F' => 12   // Stok
        ];
    }
}