<?php

namespace App\Http\Controllers;

use App\Models\Item;
use App\Models\Plant;
use App\Models\WeightValidation;
use Illuminate\Http\Request;

class ObdController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {

    }

    /**
     * Store a newly created resource in storage.
     */

    public function store(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("ERROR: Unauthorized", 403)
                ->header('Content-Type', 'text/plain');
        }

        try
        {
            $data = $request->all();
            // Validate required fields
            $missing = [];
            if (empty($data['plant_name'])) $missing[] = 'plant_name';
            if (empty($data['obd_number'])) $missing[] = 'obd_number';
            if (empty($data['line_numbers'])) $missing[] = 'line_numbers';

            if (!empty($missing))
            {
                $message = "ERROR: Missing required field(s): " . implode(', ', $missing);
                return response($message, 400)->header('Content-Type', 'text/plain');
            }

            // Lookup plant_id by plant_name
            $plantId = Plant::where('name', $data['plant_name'])->value('id');
            if (!$plantId) {
                return response("ERROR: Plant '" . $data['plant_name'] . "' not found", 404)
                    ->header('Content-Type', 'text/plain');
            }

            $missingLines = [];
            $updated = 0;

            foreach ($data['line_numbers'] as $line)
            {
                if (empty($line['line_number'])) continue;

                $exists = WeightValidation::where('plant_id', $plantId)
                    ->where('obd_number', $data['obd_number'])
                    ->where('line_number', $line['line_number'])
                    ->exists();

                if (!$exists)
                {
                    $missingLines[] = $line['line_number'];
                    continue;
                }

                $count = WeightValidation::where([
                        'plant_id'   => $plantId,
                        'obd_number' => $data['obd_number'],
                        'line_number'=> $line['line_number'],
                    ])
                    ->update([
                        'vehicle_number' => $line['vehicle_number'] ?? null,
                        'bundle_number'  => $line['bundle_number'] ?? null,
                        'picked_weight'  => $line['picked_weight'] ?? null,
                        'scanned_by'     => $line['scanned_by'] ?? null,
                        'updated_at'     => now(),
                    ]);

                $updated += $count;
            }

            if (!empty($missingLines)) {
                $message = "ERROR: Line(s) " . implode(', ', $missingLines) . " not found for Plant ID '" . $plantId . "' and OBD Number: '" . $data['obd_number'] . "'";
                return response($message, 404)->header('Content-Type', 'text/plain');
            } else {
                $message = "SUCCESS: OBD Number '" . $data['obd_number'] . "' updated successfully";
                return response($message, 200)->header('Content-Type', 'text/plain');
            }
        }
        catch (\Exception $e)
        {
            return response("ERROR: Server error", 500)->header('Content-Type', 'text/plain');
        }
    }

    /**
     * Display the specified resource.
     */

    // public function get(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("ERROR: Unauthorized", 403)
    //             ->header('Content-Type', 'text/plain');
    //     }

    //     $plantName = $request->header('Plant_Name');
    //     $obdNumber = $request->header('obd_number');

    //     if (empty($plantName) || empty($obdNumber)) {
    //         return response("ERROR: Missing required headers (Plant_Name, OBD_Number)", 400)
    //             ->header('Content-Type', 'text/plain');
    //     }

    //     // Fetch the plant record by name
    //     $plant = Plant::where('name', $plantName)->value('id');

    //     if (!$plant)
    //     {
    //         return response("ERROR: Plant not found", 400)
    //             ->header('Content-Type', 'text/plain');
    //     }

    //     $plantId = $plant->id;

    //     $records = WeightValidation::where('plant_id', $plantId)
    //         ->where('obd_number', $obdNumber)
    //         ->get();

    //     if ($records->isEmpty()) {
    //         return response("ERROR: No records found", 404)->header('Content-Type', 'text/plain');
    //     }

    //     $itemIds = $records->pluck('item_id')->unique();
    //     $itemCodes = Item::whereIn('id', $itemIds)
    //         ->select('id', 'code', 'description')
    //         ->get()
    //         ->keyBy('id');

    //     $ObdResponseStructure = [
    //         'OBD_Number' => [
    //             [
    //                 'OBD_Number' => $obdNumber,
    //                 'Line_Numbers' => $records->map(function ($item) use ($itemCodes) {
    //                     $itemInfo = $itemCodes[$item->item_id] ?? null;
    //                     return [
    //                         'Line' => $item->line_number,
    //                         'Material_Code' => $itemInfo->code ?? "",
    //                         'Material_Description' => $itemInfo->description ?? "",
    //                         // 'Quantity' => $item->picked_weight ?? "",
    //                         'Batch_Number' => $item->batch_number ?? "",
    //                         'Heat_Number' => $item->heat_number ?? "",
    //                     ];
    //                 })->toArray()
    //             ]
    //         ]
    //     ];
    //     return response()->json($ObdResponseStructure);
    // }

    public function get(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("ERROR: Unauthorized", 403)
                ->header('Content-Type', 'text/plain');
        }

        $plantName = $request->header('plant_name'); // use lowercase
        $obdNumber = $request->header('obd_number');

        if (empty($plantName) || empty($obdNumber)) {
            return response("ERROR: Missing required headers (plant_name, obd_number)", 400)
                ->header('Content-Type', 'text/plain');
        }

        // Fetch the plant id by name
        $plantId = Plant::where('name', $plantName)->value('id');

        if (!$plantId) {
            return response("ERROR: Plant not found", 400)
                ->header('Content-Type', 'text/plain');
        }

        $records = WeightValidation::where('plant_id', $plantId)
            ->where('obd_number', $obdNumber)
            ->get();

        if ($records->isEmpty()) {
            return response("ERROR: No records found", 404)->header('Content-Type', 'text/plain');
        }

        $itemIds = $records->pluck('item_id')->unique();
        $itemCodes = Item::whereIn('id', $itemIds)
            ->select('id', 'code', 'description')
            ->get()
            ->keyBy('id');

        $ObdResponseStructure = [
            'OBD_Number' => [
                [
                    'OBD_Number' => $obdNumber,
                    'Line_Numbers' => $records->map(function ($item) use ($itemCodes) {
                        $itemInfo = $itemCodes[$item->item_id] ?? null;
                        return [
                            'Line' => $item->line_number,
                            'Material_Code' => $itemInfo->code ?? "",
                            'Material_Description' => $itemInfo->description ?? "",
                            'Batch_Number' => $item->batch_number ?? "",
                            'Heat_Number' => $item->heat_number ?? "",
                        ];
                    })->toArray()
                ]
            ]
        ];
        return response()->json($ObdResponseStructure);
    }

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

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