AmirSoleimani/IRValidator

package validate

import (
    "errors"
    "fmt"
    "strconv"
)

//NationalID national id validation
func NationalID(value string) error {
    valueCount := len(value)
    if valueCount < 8 {
        return errors.New("nationalid < 8")
    }

    // check len and add zero
    if valueCount >= 8 && valueCount < 10 {
        // add zero 0...
        for i := 0; i < 10-valueCount; i++ {
            value = fmt.Sprintf("0%s", value)
        }
    }

    // convert string to int slice
    var valueSlices []uint8
    for _, s := range value {
        i, err := strconv.ParseInt(string(s), 10, 8)
        if err != nil {
            return errors.New("value problem")
        }
        valueSlices = append(valueSlices, uint8(i))
    }

    // check #1 > *position
    s, err := calculateNationalIDNumbers(&valueSlices)
    if err != nil {
        return err
    }

    // check #2
    s %= 11
    l := valueSlices[len(value)-1]
    if (s < 2 && s != int(l)) || (s >= 2 && int(l) != 11-s) {
        return errors.New("nationalid is not valid")
    }

    return nil
}

//calculateNationalIDNumbers Yo
func calculateNationalIDNumbers(valueSlices *[]uint8) (sum int, err error) {
    var i uint8
    for i = 10; i >= 2; i-- {
        sum += int((i * (*valueSlices)[10-i]))
    }
    return sum, nil
}