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

use App\Http\Controllers\Controller;
use App\Models\Inventory;
use App\Models\InventoryMovement;
use Illuminate\Http\Request;
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 PhpOffice\PhpSpreadsheet\Style\Color;
use Carbon\Carbon;

/**
 * Controlador para generación de Kardex (Excel)
 */
class KardexController extends Controller
{
    /**
     * Generar Kardex en Excel para un producto o todos los movimientos
     */
    public function export(Request $request)
    {
        // 1. VALIDACIÓN
        $request->validate([
            'inventory_id' => 'nullable|exists:inventories,id',
            'warehouse_id' => 'nullable|exists:warehouses,id',
            'fecha_inicio' => 'required|date',
            'fecha_fin' => 'required|date|after_or_equal:fecha_inicio',
            'movement_type' => 'nullable|in:entry,exit,transfer,sale,return',
        ]);

        $fechaInicio = Carbon::parse($request->fecha_inicio)->startOfDay();
        $fechaFin = Carbon::parse($request->fecha_fin)->endOfDay();

        // Si no hay inventory_id, mostrar todos los movimientos
        if (!$request->inventory_id) {
            return $this->exportAllMovements($request, $fechaInicio, $fechaFin);
        }

        $inventory = Inventory::with(['category', 'price'])->findOrFail($request->inventory_id);

        // 2. CONSULTA DE MOVIMIENTOS
        $query = InventoryMovement::where('inventory_id', $inventory->id)
            ->with(['warehouseFrom', 'warehouseTo', 'user'])
            ->whereBetween('created_at', [$fechaInicio, $fechaFin])
            ->orderBy('created_at', 'asc')
            ->orderBy('id', 'asc');

        $warehouseId = $request->warehouse_id;

        if ($warehouseId) {
            $query->where(function ($q) use ($warehouseId) {
                $q->where('warehouse_from_id', $warehouseId)
                  ->orWhere('warehouse_to_id', $warehouseId);
            });
        }

        if ($request->movement_type) {
            $query->where('movement_type', $request->movement_type);
        }

        $movements = $query->get();

        // 3. CONSTRUIR LÍNEAS DEL KARDEX
        $kardexLines = [];

        foreach ($movements as $movement) {
            $kardexLines[] = [
                'date' => $movement->created_at->format('d/m/Y H:i'),
                'type' => $this->translateMovementType($movement->movement_type),
                'warehouse_from' => $movement->warehouseFrom?->name ?? '-',
                'warehouse_to' => $movement->warehouseTo?->name ?? '-',
                'quantity' => $movement->quantity,
                'unit_cost' => $movement->unit_cost ?? 0,
                'notes' => $movement->notes ?? '',
                'invoice_reference' => $movement->invoice_reference ?? '',
                'user' => $movement->user?->name ?? '',
            ];
        }

        if (empty($kardexLines)) {
            return response()->json(['message' => 'No se encontraron movimientos en el periodo especificado'], 404);
        }

        // 5. GENERAR EXCEL
        $fileName = 'Kardex_' . ($inventory->sku ?? $inventory->id) . '_' . $fechaInicio->format('Ymd') . '_' . $fechaFin->format('Ymd') . '.xlsx';
        $filePath = storage_path('app/temp/' . $fileName);
        if (!file_exists(dirname($filePath))) mkdir(dirname($filePath), 0755, true);

        $spreadsheet = new Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();
        $sheet->setTitle('Kardex');

        // Fuente global
        $sheet->getParent()->getDefaultStyle()->getFont()->setName('Arial');

        // Estilos
        $styleLabel = [
            'font' => ['bold' => true, 'size' => 10],
            'alignment' => ['vertical' => Alignment::VERTICAL_CENTER],
        ];

        $styleBox = [
            'borders' => ['outline' => ['borderStyle' => Border::BORDER_THIN]],
            'alignment' => ['vertical' => Alignment::VERTICAL_CENTER],
        ];

        $styleTableHeader = [
            'font' => ['bold' => true, 'size' => 10, 'color' => ['rgb' => 'FFFFFF']],
            'fill' => ['fillType' => Fill::FILL_SOLID, 'startColor' => ['rgb' => '2E75B6']],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER, 'vertical' => Alignment::VERTICAL_CENTER, 'wrapText' => true],
            'borders' => ['allBorders' => ['borderStyle' => Border::BORDER_THIN]],
        ];

        $lastCol = 'J';

        // --- TÍTULO ---
        $sheet->mergeCells("A2:{$lastCol}2");
        $sheet->setCellValue('A2', 'KARDEX DE PRODUCTO');
        $sheet->getStyle('A2')->applyFromArray([
            'font' => ['bold' => true, 'size' => 16, 'color' => ['rgb' => '2E75B6']],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER, 'vertical' => Alignment::VERTICAL_CENTER],
        ]);
        $sheet->getRowDimension(2)->setRowHeight(30);

        // --- INFORMACIÓN DEL PRODUCTO ---
        $row = 4;

        $sheet->setCellValue("A{$row}", 'PRODUCTO:');
        $sheet->getStyle("A{$row}")->applyFromArray($styleLabel);
        $sheet->mergeCells("B{$row}:E{$row}");
        $sheet->setCellValue("B{$row}", $inventory->name);
        $sheet->getStyle("B{$row}:E{$row}")->applyFromArray($styleBox);

        $sheet->setCellValue("G{$row}", 'SKU:');
        $sheet->getStyle("G{$row}")->applyFromArray($styleLabel);
        $sheet->mergeCells("H{$row}:{$lastCol}{$row}");
        $sheet->setCellValue("H{$row}", $inventory->sku ?? 'N/A');
        $sheet->getStyle("H{$row}:{$lastCol}{$row}")->applyFromArray($styleBox);

        $row++;
        $sheet->setCellValue("A{$row}", 'CATEGORÍA:');
        $sheet->getStyle("A{$row}")->applyFromArray($styleLabel);
        $sheet->mergeCells("B{$row}:E{$row}");
        $sheet->setCellValue("B{$row}", $inventory->category?->name ?? 'Sin categoría');
        $sheet->getStyle("B{$row}:E{$row}")->applyFromArray($styleBox);

        $sheet->setCellValue("G{$row}", 'COSTO ACTUAL:');
        $sheet->getStyle("G{$row}")->applyFromArray($styleLabel);
        $sheet->mergeCells("H{$row}:{$lastCol}{$row}");
        $sheet->setCellValue("H{$row}", '$' . number_format($inventory->price?->cost ?? 0, 2));
        $sheet->getStyle("H{$row}:{$lastCol}{$row}")->applyFromArray($styleBox);

        // --- PERÍODO ---
        $row++;
        Carbon::setLocale('es');
        if ($fechaInicio->format('m/Y') === $fechaFin->format('m/Y')) {
            $periodoTexto = 'del ' . $fechaInicio->format('d') . ' al ' . $fechaFin->format('d') . ' de ' . $fechaFin->translatedFormat('F \d\e Y');
        } else {
            $periodoTexto = 'del ' . $fechaInicio->format('d/m/Y') . ' al ' . $fechaFin->format('d/m/Y');
        }

        $sheet->setCellValue("A{$row}", 'PERÍODO:');
        $sheet->getStyle("A{$row}")->applyFromArray($styleLabel);
        $sheet->mergeCells("B{$row}:{$lastCol}{$row}");
        $sheet->setCellValue("B{$row}", $periodoTexto);
        $sheet->getStyle("B{$row}:{$lastCol}{$row}")->applyFromArray($styleBox);
        $sheet->getStyle("B{$row}")->getFont()->setSize(11);

        // --- ENCABEZADOS DE TABLA ---
        $row += 2;
        $headerRow = $row;

        $headers = [
            'A' => 'FECHA',
            'B' => 'TIPO',
            'C' => "ALMACÉN\nORIGEN",
            'D' => "ALMACÉN\nDESTINO",
            'E' => 'CANTIDAD',
            'F' => "COSTO\nUNITARIO",
            'G' => 'REFERENCIA',
            'H' => 'NOTAS',
            'I' => 'USUARIO',
        ];

        foreach ($headers as $col => $text) {
            $sheet->setCellValue("{$col}{$row}", $text);
        }

        $sheet->getStyle("A{$row}:{$lastCol}{$row}")->applyFromArray($styleTableHeader);
        $sheet->getRowDimension($row)->setRowHeight(30);

        // --- DATOS ---
        $row++;
        $totalQuantity = 0;

        foreach ($kardexLines as $line) {
            $sheet->setCellValue("A{$row}", $line['date']);
            $sheet->setCellValue("B{$row}", $line['type']);
            $sheet->setCellValue("C{$row}", $line['warehouse_from']);
            $sheet->setCellValue("D{$row}", $line['warehouse_to']);
            $sheet->setCellValue("E{$row}", $line['quantity']);
            $sheet->setCellValue("F{$row}", $line['unit_cost'] ? '$' . number_format($line['unit_cost'], 2) : '');
            $sheet->setCellValue("G{$row}", $line['invoice_reference']);
            $sheet->setCellValue("H{$row}", $line['notes']);
            $sheet->setCellValue("I{$row}", $line['user']);

            $totalQuantity += $line['quantity'];

            // Estilo de fila
            $sheet->getStyle("A{$row}:{$lastCol}{$row}")->applyFromArray([
                'borders' => ['allBorders' => ['borderStyle' => Border::BORDER_THIN]],
                'alignment' => ['vertical' => Alignment::VERTICAL_CENTER],
                'font' => ['size' => 10],
            ]);

            // Color alterno
            if (($row - $headerRow) % 2 === 0) {
                $sheet->getStyle("A{$row}:{$lastCol}{$row}")->applyFromArray([
                    'fill' => ['fillType' => Fill::FILL_SOLID, 'startColor' => ['rgb' => 'D9E2F3']],
                ]);
            }

            $row++;
        }

        // --- FILA DE TOTALES ---
        $sheet->mergeCells("A{$row}:D{$row}");
        $sheet->setCellValue("A{$row}", 'TOTALES');
        $sheet->setCellValue("E{$row}", $totalQuantity);

        $sheet->getStyle("A{$row}:{$lastCol}{$row}")->applyFromArray([
            'font' => ['bold' => true, 'size' => 10],
            'borders' => ['allBorders' => ['borderStyle' => Border::BORDER_THIN]],
            'fill' => ['fillType' => Fill::FILL_SOLID, 'startColor' => ['rgb' => '2E75B6']],
            'alignment' => ['vertical' => Alignment::VERTICAL_CENTER],
        ]);
        $sheet->getStyle("A{$row}:{$lastCol}{$row}")->getFont()->setColor(new Color('FFFFFF'));

        // --- ANCHOS DE COLUMNA ---
        $sheet->getColumnDimension('A')->setWidth(18);
        $sheet->getColumnDimension('B')->setWidth(14);
        $sheet->getColumnDimension('C')->setWidth(18);
        $sheet->getColumnDimension('D')->setWidth(18);
        $sheet->getColumnDimension('E')->setWidth(12);
        $sheet->getColumnDimension('F')->setWidth(14);
        $sheet->getColumnDimension('G')->setWidth(18);
        $sheet->getColumnDimension('H')->setWidth(25);
        $sheet->getColumnDimension('I')->setWidth(16);
        $sheet->getColumnDimension('J')->setWidth(16);

        // 6. GUARDAR Y DESCARGAR
        $writer = new Xlsx($spreadsheet);
        $writer->save($filePath);

        return response()->download($filePath, $fileName)->deleteFileAfterSend(true);
    }

    /**
     * Traducir tipo de movimiento
     */
    private function translateMovementType(string $type): string
    {
        return match ($type) {
            'entry' => 'Entrada',
            'exit' => 'Salida',
            'transfer' => 'Traspaso',
            /* 'sale' => 'Venta',
            'return' => 'Devolución', */
            default => $type,
        };
    }

    /**
     * Exportar todos los movimientos (sin filtro de producto)
     */
    private function exportAllMovements(Request $request, Carbon $fechaInicio, Carbon $fechaFin)
    {
        // CONSULTA DE MOVIMIENTOS
        $query = InventoryMovement::with(['inventory', 'warehouseFrom', 'warehouseTo', 'user'])
            ->whereBetween('created_at', [$fechaInicio, $fechaFin])
            ->orderBy('created_at', 'asc')
            ->orderBy('id', 'asc');

        if ($request->warehouse_id) {
            $query->where(function ($q) use ($request) {
                $q->where('warehouse_from_id', $request->warehouse_id)
                  ->orWhere('warehouse_to_id', $request->warehouse_id);
            });
        }

        if ($request->movement_type) {
            $query->where('movement_type', $request->movement_type);
        }

        $movements = $query->get();

        if ($movements->isEmpty()) {
            return response()->json(['message' => 'No se encontraron movimientos en el periodo especificado'], 404);
        }

        // GENERAR EXCEL
        $fileName = 'Movimientos_' . $fechaInicio->format('Ymd') . '_' . $fechaFin->format('Ymd') . '.xlsx';
        $filePath = storage_path('app/temp/' . $fileName);
        if (!file_exists(dirname($filePath))) mkdir(dirname($filePath), 0755, true);

        $spreadsheet = new Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();
        $sheet->setTitle('Movimientos');

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

        $styleTableHeader = [
            'font' => ['bold' => true, 'size' => 10, 'color' => ['rgb' => 'FFFFFF']],
            'fill' => ['fillType' => Fill::FILL_SOLID, 'startColor' => ['rgb' => '2E75B6']],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER, 'vertical' => Alignment::VERTICAL_CENTER, 'wrapText' => true],
            'borders' => ['allBorders' => ['borderStyle' => Border::BORDER_THIN]],
        ];

        $lastCol = 'J';

        // TÍTULO
        $sheet->mergeCells("A2:{$lastCol}2");
        $sheet->setCellValue('A2', 'REPORTE DE MOVIMIENTOS DE INVENTARIO');
        $sheet->getStyle('A2')->applyFromArray([
            'font' => ['bold' => true, 'size' => 16, 'color' => ['rgb' => '2E75B6']],
            'alignment' => ['horizontal' => Alignment::HORIZONTAL_CENTER, 'vertical' => Alignment::VERTICAL_CENTER],
        ]);
        $sheet->getRowDimension(2)->setRowHeight(30);

        // PERÍODO
        $row = 4;
        Carbon::setLocale('es');
        $periodoTexto = 'del ' . $fechaInicio->format('d/m/Y') . ' al ' . $fechaFin->format('d/m/Y');

        $sheet->setCellValue("A{$row}", 'PERÍODO:');
        $sheet->getStyle("A{$row}")->getFont()->setBold(true);
        $sheet->mergeCells("B{$row}:{$lastCol}{$row}");
        $sheet->setCellValue("B{$row}", $periodoTexto);
        $sheet->getStyle("B{$row}:{$lastCol}{$row}")->applyFromArray([
            'borders' => ['outline' => ['borderStyle' => Border::BORDER_THIN]],
        ]);

        // ENCABEZADOS
        $row += 2;
        $headerRow = $row;

        $headers = [
            'A' => 'FECHA',
            'B' => 'PRODUCTO',
            'C' => 'TIPO',
            'D' => "ALMACÉN\nORIGEN",
            'E' => "ALMACÉN\nDESTINO",
            'F' => 'CANTIDAD',
            'G' => "COSTO\nUNITARIO",
            'H' => 'REFERENCIA',
            'I' => 'NOTAS',
            'J' => 'USUARIO',
        ];

        foreach ($headers as $col => $text) {
            $sheet->setCellValue("{$col}{$row}", $text);
        }

        $sheet->getStyle("A{$row}:{$lastCol}{$row}")->applyFromArray($styleTableHeader);
        $sheet->getRowDimension($row)->setRowHeight(30);

        // DATOS
        $row++;
        foreach ($movements as $movement) {
            $sheet->setCellValue("A{$row}", $movement->created_at->format('d/m/Y H:i'));
            $sheet->setCellValue("B{$row}", $movement->inventory?->name ?? 'N/A');
            $sheet->setCellValue("C{$row}", $this->translateMovementType($movement->movement_type));
            $sheet->setCellValue("D{$row}", $movement->warehouseFrom?->name ?? '-');
            $sheet->setCellValue("E{$row}", $movement->warehouseTo?->name ?? '-');
            $sheet->setCellValue("F{$row}", $movement->quantity);
            $sheet->setCellValue("G{$row}", $movement->unit_cost ? '$' . number_format($movement->unit_cost, 2) : '');
            $sheet->setCellValue("H{$row}", $movement->invoice_reference ?? '');
            $sheet->setCellValue("I{$row}", $movement->notes ?? '');
            $sheet->setCellValue("J{$row}", $movement->user?->name ?? '');

            // Estilo de fila
            $sheet->getStyle("A{$row}:{$lastCol}{$row}")->applyFromArray([
                'borders' => ['allBorders' => ['borderStyle' => Border::BORDER_THIN]],
                'alignment' => ['vertical' => Alignment::VERTICAL_CENTER],
                'font' => ['size' => 10],
            ]);

            // Color alterno
            if (($row - $headerRow) % 2 === 0) {
                $sheet->getStyle("A{$row}:{$lastCol}{$row}")->applyFromArray([
                    'fill' => ['fillType' => Fill::FILL_SOLID, 'startColor' => ['rgb' => 'D9E2F3']],
                ]);
            }

            $row++;
        }

        // ANCHOS DE COLUMNA
        $sheet->getColumnDimension('A')->setWidth(18);
        $sheet->getColumnDimension('B')->setWidth(30);
        $sheet->getColumnDimension('C')->setWidth(14);
        $sheet->getColumnDimension('D')->setWidth(18);
        $sheet->getColumnDimension('E')->setWidth(18);
        $sheet->getColumnDimension('F')->setWidth(12);
        $sheet->getColumnDimension('G')->setWidth(14);
        $sheet->getColumnDimension('H')->setWidth(18);
        $sheet->getColumnDimension('I')->setWidth(25);
        $sheet->getColumnDimension('J')->setWidth(16);

        // GUARDAR Y DESCARGAR
        $writer = new Xlsx($spreadsheet);
        $writer->save($filePath);

        return response()->download($filePath, $fileName)->deleteFileAfterSend(true);
    }
}