<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\OriginCountry;
use App\Models\StockBatch;
use App\Models\StockEntry;
use App\Models\StockPosition;
use App\Models\PhysicalItem;
use App\Models\StockSection;
use App\Models\Supplier;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

class StockBatchController extends Controller
{
    /**
     * Display a paginated listing of stock entries.
     *
     * @param Request $request
     * @return \Illuminate\Http\JsonResponse
     */
    public function index(Request $request)
    {
        $query = StockBatch::query()
            ->with(['user', 'supplier', 'stockEntries.statusHistory.status', 'files']);

        // Apply filters if provided
        if ($request->has('search')) {
            $search = $request->search;
            $query->whereHas('physicalItem', function($q) use ($search) {
                $q->where('name', 'like', "%{$search}%");
            });
        }

        // Sort
        $sortField = $request->input('sort_field', 'updated_at');
        $sortDirection = $request->input('sort_direction', 'desc');
        $query->orderBy($sortField, $sortDirection);

        // Paginate
        $perPage = $request->input('per_page', 10);
        $page = $request->input('page', 1);

        $entries = $query->paginate($perPage, ['*'], 'page', $page);

        return response()->json([
            'data' => $entries->items(),
            'meta' => [
                'total' => $entries->total(),
                'per_page' => $entries->perPage(),
                'current_page' => $entries->currentPage(),
                'last_page' => $entries->lastPage(),
            ],
        ]);
    }

    /**
     * Store a newly created stock batch, with multiple files.
     */
    public function addData(Request $request)
    {
        try {


            $validator = Validator::make($request->all(), [
                'supplier_id' => 'nullable|integer',
                'tracking_number' => 'nullable|string',
                'arrival_date' => 'nullable|date',
                'files.*' => 'file',
                'file_types' => 'array',
                'file_types.*' => 'in:invoice,label,other',
            ]);

            if ($validator->fails()) {
                return response()->json(['errors' => $validator->errors()], 422);
            }

            // create the batch
            $batch = StockBatch::create([
                'user_id' => auth()->id() ?? 1,
                'supplier_id' => $request->input('supplier_id'),
                'tracking_number' => $request->input('tracking_number'),
                'arrival_date' => $request->input('arrival_date'),
            ]);

            // attach each uploaded file
            if ($request->hasFile('files')) {
                foreach ($request->file('files') as $i => $upload) {
                    $batch->files()->create([
                        'filename' => $upload->getClientOriginalName(),
                        'file_data' => file_get_contents($upload->getRealPath()),
                        'file_type' => $request->input("file_types.{$i}", 'other'),
                        'user_id' => auth()->id() ?? 1,
                    ]);
                }
            }

            return response()->json([
                'message' => 'Stock batch created successfully',
                'data' => $batch->load(['supplier', 'user', 'files', 'stockEntries']),
            ], 201);
        }
        catch (\Exception $e) {
            return response()->json(['errors' => $e->getMessage()], 500);
        }
    }

    /**
     * Display the specified stock batch, with its files & entries.
     */
    public function show($id)
    {
        $batch = StockBatch::with(['user','supplier','files','stockEntries'])
            ->findOrFail($id);

        return response()->json(['data' => $batch]);
    }

    /**
     * Update the specified stock batch and optionally add new files.
     */
    public function updateData(Request $request, $id)
    {
        $validator = Validator::make($request->all(), [
            'supplier_id'     => 'nullable|integer|exists:supplier,id',
            'tracking_number' => 'nullable|integer',
            'arrival_date'    => 'nullable|date',
            'files.*'         => 'file',
            'file_types'      => 'array',
            'file_types.*'    => 'in:invoice,label,other',
        ]);

        if ($validator->fails()) {
            return response()->json(['errors' => $validator->errors()], 422);
        }

        $batch = StockBatch::findOrFail($id);
        $batch->update($request->only(['supplier_id','tracking_number','arrival_date']) + [
                'updated_at' => now(),
            ]);

        // if there are new files, attach them
        if ($request->hasFile('files')) {
            foreach ($request->file('files') as $i => $upload) {
                $batch->files()->create([
                    'filename'  => $upload->getClientOriginalName(),
                    'file_data' => file_get_contents($upload->getRealPath()),
                    'file_type' => $request->input("file_types.{$i}", 'other'),
                    'user_id'   => auth()->id() ?? 1,
                ]);
            }
        }

        return response()->json([
            'message' => 'Stock batch updated successfully',
            'data'    => $batch->fresh(['supplier','user','files','stockEntries']),
        ]);
    }

    /**
     * Remove the specified stock batch (and its files).
     */
    public function destroy($id)
    {
        $batch = StockBatch::with('files')->findOrFail($id);

        // delete related files first if you need to clean up storage
        foreach ($batch->files as $file) {
            $file->delete();
        }

        $batch->delete();

        return response()->json([
            'message' => 'Stock batch deleted successfully',
        ]);
    }
    /**
     * Get options for dropdown lists.
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function getOptions()
    {
        $stockPositions = StockSection::doesntHave('entries')
            ->with('position.shelf.rack.line.room')
            ->get()
            ->map(function (StockSection $section) {
                $pos   = $section->position;
                $shelf = $pos->shelf;
                $rack  = $shelf->rack;
                $line  = $rack->line;
                $room  = $line->room;

                return [
                    'id'   => $section->section_id,
                    'name' => sprintf(
                        '%s-%s-%s-%s-%s-%s',
                        $room->room_symbol,
                        $line->line_symbol,
                        $rack->rack_symbol,
                        $shelf->shelf_symbol,
                        $pos->position_symbol,
                        $section->section_symbol
                    ),
                ];
            });

        // Get suppliers from warehouse DB
        $suppliers = Supplier::select('id', 'name')->get();

        // Get physical items from warehouse DB
        $countriesOrigin = OriginCountry::select('id', 'code as name')->get();

        return response()->json([
            'stockPositions' => $stockPositions,
            'suppliers' => $suppliers,
            'countriesOrigin' => $countriesOrigin,
        ]);
    }

    /**
     * Get options for dropdown lists.
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function getItems(Request $request)
    {
        // Get physical items from warehouse DB
        $physicalItems = PhysicalItem::select('id', 'name')
            ->where('name', 'like', '%' . $request->input('item_name', '') . '%')
            ->get();

        return response()->json([
            'physicalItems' => $physicalItems,
        ]);
    }

    /**
     * Get options for dropdown lists.
     *
     * @return \Illuminate\Http\JsonResponse
     */
    public function getEntries(Request $request, $id)
    {
        // Get physical items from warehouse DB
        $stockEntries = StockEntry::with(['physicalItem', 'supplier', 'sections', 'statusHistory'])->where('stock_batch_id', $id)->get();

        return response()->json([
            "data" => $stockEntries
        ]);
    }


    public function addEntries(Request $request, $id)
    {
        // Get physical items from warehouse DB
        $stockEntries = StockEntry::whereIn('id', $request->get('ids'))->get();

        foreach ($stockEntries as $entry) {
            $entry->update([
                'stock_batch_id' => $id,
                'on_the_way' => false,
            ]);
        }

        return response()->json([
            'message' => 'Batch entries updated successfully',
            'data' => $entry->fresh(),
        ]);
    }
}