<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\StockPosition;
use Illuminate\Http\Request;
use Illuminate\Validation\ValidationException;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Illuminate\Support\Facades\Log;

// Replace these with your actual model classes
use App\Models\StockBatch;
use App\Models\StockSection;
use Metzli\Encoder\Encoder;
use Metzli\Renderer\PngRenderer;

class ScannerController extends Controller {


    public function barcodeScan(Request $request)
    {
        // 1) Validate the incoming JSON structure
        // {"barcode_type": "stock_batch","payload":{"id": 7}}
        try {
            $data = $request->validate([
                'barcode_type'      => 'required|string|in:stock_batch,stock_section,stock_position,label_scanned,carrier_scanned',
                'payload'           => 'required|array',
                'payload.id'        => 'required|integer|min:1',
            ]);
        } catch (ValidationException $e) {
            return response()->json([
                'success' => false,
                'error'   => 'validation_failed',
                'message' => $e->errors(),
            ], 422);
        }

        $type = $data['barcode_type'];
        $id   = $data['payload']['id'];

        try {
            switch ($type) {
                // ─────────────────────────────────────────────────────────────
                case 'stock_batch':
                    // Attempt to load a StockBatch by ID. Adjust with(...) if you have relationships you want to return.
                    $batch = StockBatch::with(['stockEntries.physicalItem', 'stockEntries.sections.position.shelf.rack.line.room', 'stockEntries.supplier', 'files', 'supplier'])
                        ->findOrFail($id);

                    return response()->json([
                        'success' => true,
                        'data'    => $batch,
                    ], 200);

                // ─────────────────────────────────────────────────────────────
                case 'stock_section':
                    // Attempt to load a StockSection by ID.
                    $section = StockSection::with(['position.sections.entries.physicalItem', 'entries.physicalItem'])
                        ->findOrFail($id);

                    return response()->json([
                        'success' => true,
                        'data'    => $section,
                    ], 200);

                // ─────────────────────────────────────────────────────────────
                case 'stock_position':
                    // Attempt to load a StockPosition by ID.
                    $position = StockPosition::with(['shelf', 'sections.entries.physicalItem'])
                        ->findOrFail($id);

                    return response()->json([
                        'success' => true,
                        'data'    => $position,
                    ], 200);

                // ─────────────────────────────────────────────────────────────
                case 'label_scanned':
                    // Attempt to load a Label by ID. Replace with your real model/relations.
                    $label = Label::with(['product', 'batch'])
                        ->findOrFail($id);

                    return response()->json([
                        'success' => true,
                        'data'    => $label,
                    ], 200);

                // ─────────────────────────────────────────────────────────────
                case 'carrier_scanned':
                    // “Do something” for carrier scans. For example, mark the carrier as checked‐in.
                    // Here we just look up a Carrier and flip a boolean. Adjust to your real logic.
                    $carrier = Carrier::findOrFail($id);
                    $carrier->last_scanned_at = now();
                    $carrier->save();

                    return response()->json([
                        'success' => true,
                    ], 200);

                // ─────────────────────────────────────────────────────────────
                default:
                    // This will never run because our validator already limits barcode_type to the four values.
                    return response()->json([
                        'success' => false,
                        'error'   => 'invalid_barcode_type',
                    ], 400);
            }
        } catch (ModelNotFoundException $e) {
            // Any of the findOrFail(...) calls threw a ModelNotFoundException
            return response()->json([
                'success' => false,
                'error'   => 'not_found',
                'message' => "No record found for ID {$id} under type '{$type}'.",
            ], 404);

        } catch (\Exception $e) {
            // Log the exception so you can inspect it later
            Log::error('Error in BarcodeController@scan', [
                'barcode_type' => $type,
                'id'           => $id,
                'exception'    => $e->getMessage(),
                'trace'        => $e->getTraceAsString(),
            ]);

            return response()->json([
                'success' => false,
                'error'   => 'server_error',
                'message' => 'An unexpected error occurred.',
            ], 500);
        }
    }

    public function batchBarcodePrint(Request $request) {

        $code = Encoder::encode(json_encode(
            [
                "barcode_type" => "stock_batch",
                "payload" => [
                    'id' => $request->input('id'),
                ]
            ]
        ));
        $renderer = new PngRenderer();

        $aztec_code = $renderer->render($code);

        $base64_aztec_img = base64_encode($aztec_code);
        $base64_aztec_src = "data:image/png;base64,{$base64_aztec_img}";
        return response()->json([
            'success' => true,
            'data'    => $base64_aztec_src,
        ], 200);
    }

}