<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Str;
use Illuminate\Support\Facades\Schema;

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

    /**
     * Store a newly created resource in storage.
     */
    // public function store(Request $request)
    // {
    //     //
    // }

    public function getSapData(Request $request)
    {

    }

    public function readFiles(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');

         if ($plantCode == null || $plantCode == '')
        {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "Plant code can't be empty!"
            ], 400);
        }
        else if (Str::length($plantCode) < 4 || !is_numeric($plantCode) || !preg_match('/^[1-9]\d{3,}$/', $plantCode))
        {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "Invalid plant code found!"
            ], 400);
        }

        $path = "/LaserPRD/{$plantCode}";

        // $isDir = is_dir($path);
        // $isReadable = is_readable($path);

        // Check if folder exists
        if (!is_dir($path)) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "Folder for plant-code {$plantCode} not found!"
            ], 404);
        }

        if (!is_readable($path)) {
            return response()->json([
                'status_code' => 'ERROR',
                'status_description' => "Folder for plant-code {$plantCode} exists but is not readable!"
            ], 500);
        }

        // Scan folder
        $allFiles = scandir($path);
        if ($allFiles === false) {
            return response()->json([
                'status' => 'error',
                'status_description' => 'Failed to scan directory',
            ], 500);
        }

        $files = array_filter($allFiles, function($item) use ($path) {
            $fullPath = $path . '/' . $item;
            return @is_file($fullPath) && pathinfo($item, PATHINFO_EXTENSION) === 'txt';
        });

        if (empty($files)) {
            return response()->json([
                'status' => 'error',
                'status_description' => 'No text files found',
            ], 404);
        }

        // $data = [];
        // foreach ($files as $file)
        // {
        //     $filePath = $path . '/' . $file;

        //     $content = file_get_contents($filePath);

        //     $data[] = [
        //         'filename' => $file,
        //         'content' => $content,
        //     ];
        // }

        // return response()->json([
        //     'status' => 'success',
        //     'files' => $data,
        // ]);

        $fileName = 'RMGLAS02-1725800-1.txt';

         $lines = file($fileName, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
        if (!$lines) {
            return response()->json(['status' => 'ERROR', 'message' => 'File is empty'], 400);
        }

         $table = 'class_characteristics';
        $columns = Schema::getColumnListing($table); // returns lowercase column names

        $rows = [];
        foreach ($lines as $line) {
            $values = str_getcsv($line); // split by comma

            $row = [];
            foreach ($columns as $index => $column) {
                $value = $values[$index] ?? null;  // if missing, set null
                if ($value === '') $value = null;   // empty string -> null
                $row[$column] = $value;
            }

            $rows[] = $row;
        }

          // Insert into database
            foreach ($rows as $row) {
                \App\Models\ClassCharacteristic::create($row);
            }

            return response()->json([
                'status' => 'SUCCESS',
                'rows_imported' => count($rows),
            ]);
    }


    /**
     * 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)
    {
        //
    }
}