<?php

namespace App\Http\Controllers;

use App\Models\GrMaster;
use App\Models\Item;
use App\Models\Plant;
use App\Models\User;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Response;
use Illuminate\Support\Facades\Storage;
use Str;

class PdfController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {
        //
    }
    public function updateGR(Request $request)
    {
        $expectedUser = env('API_AUTH_USER');
        $expectedPw   = env('API_AUTH_PW');

        $header_auth = $request->header('Authorization');
        $expectedToken = $expectedUser . ':' . $expectedPw;

        if ("Bearer " . $expectedToken != $header_auth)
        {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Invalid authorization token!'
            ], 403);
        }

        $data = $request->all();

        if ($data['plant_code'] == null || $data['plant_code'] == '')
        {
            // return response("ERROR: Please provide a valid plant code.", 400)
            //     ->header('Content-Type', 'text/plain');
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "Plant code can't be empty!"
            ], 400);
        }
        else if (Str::length($data['plant_code']) < 4 || !is_numeric($data['plant_code']) || !preg_match('/^[1-9]\d{3,}$/', $data['plant_code']))//!ctype_digit($data['plant_code'])
        {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "Invalid plant code found!"
            ], 400);
        }

        $plant = Plant::where('code', $data['plant_code'])->first();
        if (!$plant) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Plant not found!'
            ], 400);
        }

        $plantId = $plant->id;
        if ($data['gr_number'] == null || $data['gr_number'] == '')
        {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "GR Number can't be empty!"
            ], 400);
        }

        $grExists = GRMaster::where('plant_id', $plantId)
            ->where('gr_number', $data['gr_number'])
            ->first();

        if (!$grExists) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "GR Number {$data['gr_number']} not found for plant {$data['plant_code']}!"
            ], 404);
        }

        $scannedBy = $data['scanned_by'] ?? null;

        if ($scannedBy == '' || $scannedBy == null) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "Scanned by can't be empty!"
            ], 400);
        }

        $user = User::where('name', $data['scanned_by'])
            ->first();

        if (!$user) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "'{$data['scanned_by']}' user not found!"
            ], 404);
        }

        $itemCodes = array_column($data['item_codes'], 'item_code');

        $duplicateItemCodes = array_unique(array_diff_assoc($itemCodes, array_unique($itemCodes)));

        if (count($duplicateItemCodes) > 0) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Duplicate item codes found in request!',
                'duplicate_item_codes' => array_values($duplicateItemCodes)
            ], 400);
        }

        $allSerials = [];
        foreach ($data['item_codes'] as $item) {
            if (!isset($item['serial_numbers']) || !is_array($item['serial_numbers'])) {
                continue;
            }
            foreach ($item['serial_numbers'] as $serial) {
                $allSerials[] = $serial;
            }
        }

        $duplicateSerials = array_unique(array_diff_assoc($allSerials, array_unique($allSerials)));

        if (count($duplicateSerials) > 0) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Duplicate serial numbers found in request!',
                'duplicate_serial_numbers' => array_values($duplicateSerials)
            ], 400);
        }

        $invalidLengthItemCodes = [];

        foreach ($data['item_codes'] as $item) {
            $itemCode = $item['item_code'] ?? null;

            // Skip if item code is missing
            if (!$itemCode) {
                continue;
            }

            // Check if item code is less than 6 digits or not numeric
            if (strlen($itemCode) < 6 || !ctype_digit($itemCode)) {
                $invalidLengthItemCodes[] = $itemCode;
            }
        }
        if (count($invalidLengthItemCodes) > 0) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Some item codes are invalid: must be at least 6 digits!',
                'invalid_item_codes' => array_values($invalidLengthItemCodes)
            ], 400);
        }


        $invalidItemCodes = [];
        $invalidPlantItems = [];

        foreach ($data['item_codes'] as $item)
        {
            $itemCode = $item['item_code'] ?? null;

            if (!$itemCode) {
                $invalidItemCodes[] = "(missing)";
                continue;
            }

            $itemObj = Item::where('code', $itemCode)->first();
            if (!$itemObj) {
                $invalidItemCodes[] = $itemCode;
                continue;
            }

            $itemPlant = Item::where('plant_id', $plantId)
                ->where('code', $itemCode)->first();
            if (!$itemPlant) {
                $invalidPlantItems[] = $itemCode;
            }
        }

        if (count($invalidItemCodes) > 0 || count($invalidPlantItems) > 0) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Some item codes are invalid!',
                'not_found_items' => array_values($invalidItemCodes),
                'not_in_plant' => array_values($invalidPlantItems)
            ], 400);
        }

        $missingSerialsByItem = [];

        foreach ($data['item_codes'] as $item) {
            $itemCode = $item['item_code'];
            $serialNumbers = $item['serial_numbers'];

            // Get the item id
            $itemObj = Item::where('plant_id', $plantId)
                ->where('code', $itemCode)
                ->first();

            if (!$itemObj) {
                continue;
            }

            $itemId = $itemObj->id;

            $foundSerials = GRMaster::where('plant_id', $plantId)
                ->where('gr_number', $data['gr_number'])
                ->where('item_id', $itemId)
                ->whereIn('serial_number', $serialNumbers)
                ->pluck('serial_number')
                ->toArray();

            $missingSerials = array_diff($serialNumbers, $foundSerials);

            if (count($missingSerials) > 0) {
                $missingSerialsByItem[$itemCode] = array_values($missingSerials);
            }
        }

        if (count($missingSerialsByItem) > 0) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Some serial numbers not found in DB for given plant, GR number, and item!',
                'missing_serials' => $missingSerialsByItem
            ], 400);
        }

        $alreadyCompleted = [];

        foreach ($data['item_codes'] as $item) {
            $itemCode = $item['item_code'];
            $serialNumbers = $item['serial_numbers'];

            $itemId = Item::where('code', $itemCode)->value('id');

            foreach ($serialNumbers as $serial) {
                $gr = GRMaster::where('plant_id', $plantId)
                    ->where('item_id', $itemId)
                    ->where('gr_number', $data['gr_number'])
                    ->where('serial_number', $serial)
                    ->first();

                if (!$gr) {
                    continue;
                }

                if ($gr->status == 'Completed') {
                    $alreadyCompleted[] = $serial;
                }
            }
        }

        if (!empty($alreadyCompleted)) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Below serial numbers are already completed',
                'serial_numbers' => $alreadyCompleted
            ], 400);
        }
        // {
        //     $itemCode = $item['item_code'];
        //     $serialNumbers = $item['serial_numbers'];

        //     $itemObj = Item::where('code', $itemCode)->first();
        //     if (!$itemObj) {
        //         return response()->json([
        //             'status_code' => 'ERROR',
        //             'status_description' => "Item code: $itemCode not found"
        //         ], 400);
        //     }

        //     $itemPlant = Item::where('plant_id', $plantId)
        //     ->where('code', $itemCode)->first();
        //     if (!$itemPlant) {
        //         return response()->json([
        //             'status_code' => 'ERROR',
        //             'status_description' => "Item code: $itemCode not found for the plant: $data[plant_code]"
        //         ], 400);
        //     }


        //     $itemId = $itemObj->id;

        //     // Update all serial numbers for this item
        //     GRMaster::where('plant_id', $plantId)
        //         ->where('item_id', $itemId)
        //         ->where('gr_number', $data['gr_number'])
        //         ->whereIn('serial_number', $serialNumbers)
        //         ->update(['created_by' => $scannedBy]);
        // }


        foreach ($data['item_codes'] as $item)
        {
            $itemCode = $item['item_code'];
            $serialNumbers = $item['serial_numbers'];

            $itemId = Item::where('code', $itemCode)->value('id');

            GRMaster::where('plant_id', $plantId)
                ->where('item_id', $itemId)
                ->where('gr_number', $data['gr_number'])
                ->whereIn('serial_number', $serialNumbers)
                ->update(['created_by' => $scannedBy, 'status' => 'Completed',]);
        }

        return response()->json([
            'status_code' => 'SUCCESS',
            'status_description' => 'Serial numbers updated successfully!'
        ], 200);

    }

    /**
     * Store a newly created resource in storage.
     */
    public function getPdf(Request $request)
    {
         // Validate input
        // $request->validate([
        //     'filename' => 'required|string',
        // ]);
        $expectedUser = env('API_AUTH_USER');
        $expectedPw   = env('API_AUTH_PW');
        $header_auth  = $request->header('Authorization');
        $expectedToken = $expectedUser . ':' . $expectedPw;

        if ("Bearer " . $expectedToken != $header_auth)
        {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Invalid authorization token!'
            ], 403);
        }

        $filename  = $request->header('process-order');

        if (!$filename)
        {
            return response()->json(['error' => 'Missing file-name header'], 400);
        }

        $filename = basename($filename);

        // Ensure the file has .pdf extension
        if (!str_ends_with(strtolower($filename), '.pdf')) {
            $filename .= '.pdf';
        }

        $filePath = "uploads/ProcessOrder/" . $filename;

        if (!Storage::disk('local')->exists($filePath)) {
            return response()->json(['error' => 'File not found'], 404);
        }

        $file = Storage::disk('local')->get($filePath);
        $mimeType = Storage::disk('local')->mimeType($filePath);

        return Response::make($file, 200, [
            'Content-Type' => $mimeType,
            'Content-Disposition' => 'inline; filename="' . $filename . '"',
        ]);

    }

    public function getGRPdf(Request $request)
    {
         // Validate input
        // $request->validate([
        //     'filename' => 'required|string',
        // ]);
        $expectedUser = env('API_AUTH_USER');
        $expectedPw   = env('API_AUTH_PW');
        $header_auth  = $request->header('Authorization');
        $expectedToken = $expectedUser . ':' . $expectedPw;

        if ("Bearer " . $expectedToken != $header_auth)
        {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Invalid authorization token!'
            ], 403);
        }

        $filename  = $request->header('gr-number');

        if (!$filename)
        {
            return response()->json(['error' => 'Missing file-name header'], 400);
        }

        $filename = basename($filename);

        // Ensure the file has .pdf extension
        if (!str_ends_with(strtolower($filename), '.pdf')) {
            $filename .= '.pdf';
        }

        $filePath = "uploads/GRNumber/" . $filename;

        if (!Storage::disk('local')->exists($filePath)) {
            return response()->json(['error' => 'File not found'], 404);
        }

        $file = Storage::disk('local')->get($filePath);
        $mimeType = Storage::disk('local')->mimeType($filePath);

        return Response::make($file, 200, [
            'Content-Type' => $mimeType,
            'Content-Disposition' => 'inline; filename="' . $filename . '"',
        ]);

    }

    public function getGRSerial(Request $request)
    {
        $expectedUser = env('API_AUTH_USER');
        $expectedPw   = env('API_AUTH_PW');
        $header_auth  = $request->header('Authorization');
        $expectedToken = $expectedUser . ':' . $expectedPw;

        if ("Bearer " . $expectedToken != $header_auth)
        {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'Invalid authorization token!'
            ], 403);
        }

        $plantCode  = $request->header('plant-code');

        $grNumber = $request->header('gr-number');


        if (!$plantCode) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "Plant Code value can't be empty"
            ], 404);
        }
        else if (!$grNumber)
        {
             return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'GR Number is cannot be empty!'
            ], 403);
        }

        $plant = Plant::where('code', $plantCode)->first();
        $plantId = $plant->id;

        if (!$plant) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "Plant Code '{$plantCode}' not found!"
            ], 404);
        }

        $grExist = GRMaster::where('gr_number', $grNumber)->first();

        if (!$grExist) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'GR Number not found'
            ], 404);
        }

        $grExists = GRMaster::where('plant_id', $plantId)
             ->where('gr_number', $grNumber)
             ->first();

        if (!$grExists) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'GR Number not found for this plant!'
            ], 404);
        }


        $grRecords = GrMaster::where('plant_id', $plantId)
                ->where('gr_number', $grNumber)
                ->get(['serial_number', 'item_id']);

        if (empty($grRecords )) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => 'No serial numbers found for the given GR number!'
            ], 404);
        }

        // return response()->json([
        //     'serial_numbers' => $serialNumbers
        // ], 200);
        // $itemId = $grRecords->first()->item_id;

        // $itemCode = $itemId ? optional(Item::find($itemId))->code : null;

        // $serialNumbers = $grRecords->pluck('serial_number')->toArray();

        // return response()->json([
        //     'item_code' => $itemCode,
        //     'serial_numbers' => $serialNumbers
        // ], 200);
        $itemIds = $grRecords->pluck('item_id')->unique()->filter();

            $items = Item::whereIn('id', $itemIds)->pluck('code', 'id');

            $result = $grRecords->groupBy('item_id')->map(function ($group, $itemId) use ($items) {
                return [
                    'item_code' => $items[$itemId] ?? null,
                    'serial_numbers' => $group->pluck('serial_number')->toArray()
                ];
            })->values(); // remove keys

            return response()->json($result, 200);
    }


    /**
     * Display the specified resource.
     */
    public function show(string $id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, string $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(string $id)
    {
        //
    }
}