Fs02/grimoire

package changeset

import (
    "strconv"
    "strings"
)

// ValidateMinErrorMessage is the default error message for ValidateMin.
var ValidateMinErrorMessage = "{field} must be more than {min}"

// ValidateMin validates the value of given field is not smaller than min.
// Validation can be performed against string, slice and numbers.
func ValidateMin(ch *Changeset, field string, min int, opts ...Option) {
    val, exist := ch.changes[field]
    if !exist {
        return
    }

    options := Options{
        message: ValidateMinErrorMessage,
    }
    options.apply(opts)

    invalid := false

    switch v := val.(type) {
    case string:
        invalid = len(v) < min
    case []interface{}:
        invalid = len(v) < min
    case []*Changeset:
        invalid = len(v) < min
    case int:
        invalid = v < min
    case int8:
        invalid = v < int8(min)
    case int16:
        invalid = v < int16(min)
    case int32:
        invalid = v < int32(min)
    case int64:
        invalid = v < int64(min)
    case uint:
        invalid = v < uint(min)
    case uint8:
        invalid = v < uint8(min)
    case uint16:
        invalid = v < uint16(min)
    case uint32:
        invalid = v < uint32(min)
    case uint64:
        invalid = v < uint64(min)
    case uintptr:
        invalid = v < uintptr(min)
    case float32:
        invalid = v < float32(min)
    case float64:
        invalid = v < float64(min)
    }

    if invalid {
        r := strings.NewReplacer("{field}", field, "{min}", strconv.Itoa(min))
        AddError(ch, field, r.Replace(options.message))
    }
}