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<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\DataAwareRule;
use Illuminate\Contracts\Validation\InvokableRule;

class ValidatePriceRangeQuantity implements InvokableRule, DataAwareRule
{

/**
     * All of the data under validation.
     *
     * @var array
     */
    protected $data = [];

/**
     * Set the data under validation.
     *
     * @param  array  $data
     * @return $this
     */
    public function setData($data)
    {
        $this->data = $data;

return $this;
    }

/**
     * Run the validation rule.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
     * @return void
     */
    public function __invoke($attribute, $value, $fail)
    {
        $from_arr = explode('.', $attribute);
        $ranges = $this->data[$from_arr[0]][$from_arr[1]][$from_arr[2]];

if ($from_arr[3] > 0){
            $previous_key = $this->getPreviousKey($from_arr[3], $ranges);
            if ($value <= $ranges[$previous_key]['qty_to']){
                return $fail('Quantity from for price range of combination #:position must be greater than previous quantity to.');  // -> "quantity is invalid"
            }
        }
    }

private function getPreviousKey($current_key, $ranges = []): int|string
    {
        $keys = array_keys($ranges);
        return $keys[array_search($current_key, $keys) -1];
    }

}