<?php
namespace App\Library;

use DB;
use Hash;
use Storage;
use Config;
use Illuminate\Support\Carbon;
use App\Diagnosis;
use App\User;

class RandomLibrary {
    /**
    * @param object $model
    * @param string|null $column
    * @param string $forCondition
    * @return string|null
    */
    public function random($model, $column, $forCondition): ?string {
        /** @var integer $count */
        $count = 1;
        /** @var boolean $condition */
        $condition = true;
        do {
            if($forCondition == 'patient') {
                //For patient
                $checkCount = $model->where('type','patient')->withTrashed()->count();
            } else if($forCondition == 'diagnosis') {
                //For diagnosis
                $checkCount = $model->where('parent_id', NULL)->withTrashed()->count();
            } else if($forCondition == 'prescription') {
                //For prescription
                $checkCount = $model->withTrashed()->count();
            } else {
                //For appointment
                $checkCount = $model->withTrashed()->count();
            }

            $invID = $checkCount + $count;
            $data_invID = (string)$invID;
            $returnData = str_pad($data_invID, 8, '0', STR_PAD_LEFT);

            $checkLayer = $model->select('id')->where($column, $returnData)->withTrashed()->get();
            if (count($checkLayer) != 0) {
                $count++;
                $condition = true;
            } else {
                $condition = false;
            }

        } while ($condition);

        /** @var string|null $returnData */
        return $returnData;
    }

    /**
    * @param string|null $id
    * @param object $model
    * @param string|null $column
    * @param string $forCondition
    * @return string|null
    */
    public function randomPluck($id, $model, $column, $forCondition='appointment'): ?string {
        if($id != null) {
            $initalQuery = $model->select('id')->where($column, $id)->withTrashed()->count();
            if($initalQuery != 0) {
                $returnData = $this->random($model, $column, $forCondition);
            } else {
                $returnData = $id;
            }
        } else {
            $returnData = $this->random($model, $column, $forCondition);
        }

        /** @var string|null $returnData */
        return $returnData;
    }
}