<?php

namespace App\Http\Controllers;

use App\Http\Requests;
use App\Http\Controllers\Controller;

use App\License;
use App\LicenseType;
use App\Product;
use App\Purchaser;
use App\Subproduct;
use App\Vendor;
use Illuminate\Http\Request;
use Carbon\Carbon;
use Illuminate\Support\Facades\DB;
use Session;

class LicenseController extends Controller
{
    public function __construct()
    {
        $this->middleware('auth');
    }

    /**
     * Display a listing of the resource.
     *
     * @return Response
     */
    public function index()
    {
        $license = License::orderBy('created_at', 'desc')->paginate(15);
        $batchNum = License::max('batch');
        return view('license.index', compact('license', 'batchNum'));
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return Response
     */
    public function create()
    {
        $licensetype = LicenseType::lists('licenseType', 'id');
        $product = Product::lists('productName', 'id');
        $subproduct = Subproduct::lists('subproductName', 'id');
        $vendor = Vendor::lists('vendorName', 'id');

        return view('license.create', compact('licensetype', 'product', 'subproduct', 'vendor'));
    }

    /**
     * Store a newly created resource in storage.
     *
     * @return Response
     */
    public function store(Request $request)
    {
        $batch = (int)License::max('batch');
        // make sure a null value is entered - is this really necessary?
        $request['expiration'] = $request['expiration']?:null;

        for ($i=0; $i < $request['numLicenses']; $i++) {
            License::create(array_merge($request->all(), ['licenseKey' => $this->generateLicenseKey(), 'batch' => $batch+1]));
        }
        Session::flash('flash_message', 'License added!');

        return redirect('license');
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     *
     * @return Response
     */
    public function show($id)
    {
        $license = License::findOrFail($id);

        return view('license.show', compact('license'));
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     *
     * @return Response
     */
    public function edit($id)
    {
        $license = License::findOrFail($id);

        $licensetype = LicenseType::lists('licenseType', 'id');
        $product = Product::lists('productName', 'id');
        $subproduct = Subproduct::lists('subproductName', 'id');
        $vendor = Vendor::lists('vendorName', 'id');
        $purchaser = Purchaser::lists('contactName', 'id');

        return view('license.edit', compact('license', 'licensetype', 'product', 'subproduct', 'vendor', 'purchaser'));
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  int  $id
     *
     * @return Response
     */
    public function update($id, Request $request)
    {
        
        $license = License::findOrFail($id);
        $license->update($request->all());

        Session::flash('flash_message', 'License updated!');

        return redirect('license');
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     *
     * @return Response
     */
    public function destroy($id)
    {
        License::destroy($id);

        Session::flash('flash_message', 'License deleted!');

        return redirect('license');
    }

    /**
     * Generates a license key
     */
    public function generateLicenseKey() {
        $tokens = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $segment_chars = 5;
        $num_segments = 4;
        $key_string = '';

        for ($i = 0; $i < $num_segments; $i++) {

            $segment = '';

            for ($j = 0; $j < $segment_chars; $j++) {
                $segment .= $tokens[rand(0, 35)];
            }

            $key_string .= $segment;

            if ($i <= $num_segments-1) {
                $key_string .= '-';
            }

        }

        $key_string .= strtoupper(substr(md5($key_string), 0, 5));

        return $key_string;
    }

}