<?php namespace App\Http\Controllers\App;

use App\Http\Requests\App\BillStoreRequest;
use App\Http\Requests\App\BillUpdateRequest;
use App\Models\Bill;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Storage;
use Notsoweb\ApiResponse\Enums\ApiResponse;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
use PhpOffice\PhpSpreadsheet\Style\Border;
use PhpOffice\PhpSpreadsheet\Style\Fill;
use PhpOffice\PhpSpreadsheet\Style\Alignment;
use Carbon\Carbon;

class BillController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {
        $query = Bill::query()->with('supplier');

        if (request()->filled('q')) {
            $query->where('name', 'like', '%' . request()->q . '%');
        }

        $bills = $query->orderByDesc('created_at')
            ->paginate(config('app.pagination', 15));

        return ApiResponse::OK->response(['bills' => $bills]);
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(BillStoreRequest $request)
    {
        $data = $request->validated();

        if ($request->hasFile('file')) {
            $data['file_path'] = $request->file('file')->store('bills', 'public');
        }

        unset($data['file']);

        $bill = Bill::create($data);

        return ApiResponse::CREATED->response(['bill' => $bill]);
    }

    /**
     * Display the specified resource.
     */
    public function show(Bill $bill)
    {
        return ApiResponse::OK->response(['bill' => $bill]);
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(BillUpdateRequest $request, Bill $bill)
    {
        $data = $request->validated();

        if ($request->hasFile('file')) {
            if ($bill->file_path) {
                Storage::disk('public')->delete($bill->file_path);
            }
            $data['file_path'] = $request->file('file')->store('bills', 'public');
        }

        unset($data['file']);

        $bill->update($data);

        return ApiResponse::OK->response(['bill' => $bill->fresh()]);
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(Bill $bill)
    {
        if ($bill->file_path) {
            Storage::disk('public')->delete($bill->file_path);
        }

        $bill->delete();

        return ApiResponse::OK->response();
    }

    /**
     * Alterna el estado de pago de la factura.
     */
    public function togglePaid(Bill $bill)
    {
        $bill->update(['paid' => !$bill->paid]);

        return ApiResponse::OK->response(['bill' => $bill->fresh()]);
    }

    /**
     * Exporta a Excel las facturas pendientes de pago.
     */
    public function export()
    {
        $bills = Bill::with('supplier')->where('paid', false)
            ->orderBy('deadline')
            ->orderBy('created_at')
            ->get();

        $spreadsheet = new Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();
        $sheet->setTitle('Facturas por Pagar');

        $sheet->getParent()->getDefaultStyle()->getFont()->setName('Arial')->setSize(10);

        $styleHeader = [
            'font'      => ['bold' => true, 'size' => 10, 'color' => ['rgb' => 'FFFFFF']],
            'fill'      => ['fillType' => Fill::FILL_SOLID, 'startColor' => ['rgb' => '4472C4']],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER, 'vertical' => Alignment::VERTICAL_CENTER],
            'borders'   => ['allBorders' => ['borderStyle' => Border::BORDER_THIN]],
        ];

        $styleData = [
            'borders'   => ['allBorders' => ['borderStyle' => Border::BORDER_THIN, 'color' => ['rgb' => 'D0D0D0']]],
            'alignment' => ['vertical' => Alignment::VERTICAL_CENTER],
        ];

        // Título
        $sheet->mergeCells('A1:F1');
        $sheet->setCellValue('A1', 'FACTURAS PENDIENTES DE PAGO');
        $sheet->getStyle('A1')->applyFromArray([
            'font'      => ['bold' => true, 'size' => 14],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER],
        ]);

        $sheet->mergeCells('A2:F2');
        $sheet->setCellValue('A2', 'Generado el ' . Carbon::now()->format('d/m/Y H:i'));
        $sheet->getStyle('A2')->applyFromArray([
            'font'      => ['italic' => true, 'color' => ['rgb' => '666666']],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER],
        ]);

        // Encabezados
        $headers = ['A4' => '#', 'B4' => 'NOMBRE', 'C4' => 'PROVEEDOR', 'D4' => 'COSTO', 'E4' => 'FECHA LÍMITE', 'F4' => 'DÍAS RESTANTES'];
        foreach ($headers as $cell => $text) {
            $sheet->setCellValue($cell, $text);
        }
        $sheet->getStyle('A4:F4')->applyFromArray($styleHeader);
        $sheet->getRowDimension(4)->setRowHeight(22);

        // Datos
        $row = 5;
        $total = 0;
        foreach ($bills as $i => $bill) {
            $deadline = $bill->deadline ? Carbon::parse($bill->deadline) : null;
            // Positivo = días que faltan, negativo = días vencida
            $daysLeft = $deadline ? (int) Carbon::today()->diffInDays($deadline, false) : null;

            if ($daysLeft === null) {
                $daysLabel = '—';
            } elseif ($daysLeft === 0) {
                $daysLabel = 'Hoy';
            } elseif ($daysLeft > 0) {
                $daysLabel = "+{$daysLeft}";
            } else {
                $daysLabel = (string) $daysLeft; // ya incluye el signo negativo
            }

            $sheet->setCellValue('A' . $row, $i + 1);
            $sheet->setCellValue('B' . $row, $bill->name);
            $sheet->setCellValue('C' . $row, $bill->supplier?->business_name ?? '—');
            $sheet->setCellValue('D' . $row, (float) $bill->cost);
            $sheet->setCellValue('E' . $row, $deadline?->format('d/m/Y') ?? '—');
            $sheet->setCellValue('F' . $row, $daysLabel);

            $sheet->getStyle('D' . $row)->getNumberFormat()->setFormatCode('$#,##0.00');
            $sheet->getStyle('A' . $row . ':F' . $row)->applyFromArray($styleData);
            $sheet->getStyle('A' . $row)->getAlignment()->setHorizontal(Alignment::HORIZONTAL_CENTER);
            $sheet->getStyle('D' . $row)->getAlignment()->setHorizontal(Alignment::HORIZONTAL_RIGHT);
            $sheet->getStyle('E' . $row)->getAlignment()->setHorizontal(Alignment::HORIZONTAL_CENTER);
            $sheet->getStyle('F' . $row)->getAlignment()->setHorizontal(Alignment::HORIZONTAL_CENTER);

            // Verde si quedan días, rojo si está vencida
            if ($daysLeft !== null && $daysLeft > 0) {
                $sheet->getStyle('F' . $row)->getFont()->getColor()->setRGB('1A7A1A');
            } elseif ($daysLeft !== null && $daysLeft < 0) {
                $sheet->getStyle('E' . $row . ':F' . $row)->getFont()->getColor()->setRGB('CC0000');
                $sheet->getStyle('E' . $row . ':F' . $row)->getFont()->setBold(true);
            } elseif ($daysLeft === 0) {
                $sheet->getStyle('F' . $row)->getFont()->getColor()->setRGB('B45309');
                $sheet->getStyle('F' . $row)->getFont()->setBold(true);
            }

            $total += (float) $bill->cost;
            $row++;
        }

        // Total
        $sheet->setCellValue('C' . $row, 'TOTAL PENDIENTE');
        $sheet->setCellValue('D' . $row, $total);
        $sheet->getStyle('D' . $row)->getNumberFormat()->setFormatCode('$#,##0.00');
        $sheet->getStyle('C' . $row . ':D' . $row)->applyFromArray([
            'font'      => ['bold' => true, 'size' => 11],
            'fill'      => ['fillType' => Fill::FILL_SOLID, 'startColor' => ['rgb' => 'FFF2CC']],
            'borders'   => ['allBorders' => ['borderStyle' => Border::BORDER_THIN]],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_RIGHT],
        ]);

        // Anchos de columna
        $sheet->getColumnDimension('A')->setWidth(6);
        $sheet->getColumnDimension('B')->setWidth(36);
        $sheet->getColumnDimension('C')->setWidth(30);
        $sheet->getColumnDimension('D')->setWidth(18);
        $sheet->getColumnDimension('E')->setWidth(16);
        $sheet->getColumnDimension('F')->setWidth(16);

        // Generar archivo
        $fileName = 'Facturas_Pendientes_' . Carbon::now()->format('Ymd_His') . '.xlsx';
        $filePath = storage_path('app/temp/' . $fileName);
        if (!file_exists(dirname($filePath))) mkdir(dirname($filePath), 0755, true);

        (new Xlsx($spreadsheet))->save($filePath);

        return response()->download($filePath, $fileName, [
            'Content-Type' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
        ])->deleteFileAfterSend(true);
    }
}