package mapping

import (
	"errors"
	"fmt"
	"reflect"
	"sync"
)

const (
	defaultOption      = "default"
	envOption          = "env"
	inheritOption      = "inherit"
	stringOption       = "string"
	optionalOption     = "optional"
	optionsOption      = "options"
	rangeOption        = "range"
	optionSeparator    = "|"
	equalToken         = "="
	escapeChar         = '\\'
	leftBracket        = '('
	rightBracket       = ')'
	leftSquareBracket  = '['
	rightSquareBracket = ']'
	segmentSeparator   = ','
)

var (
	errUnsupportedType = errors.New("unsupported type on setting field value")
	errNumberRange     = errors.New("wrong number range setting")
	//optionsCache        = make(map[string]optionsCacheValue)
	cacheLock sync.RWMutex
	//structRequiredCache = make(map[reflect.Type]requiredCacheValue)
	structCacheLock sync.RWMutex
)

func Deref(t reflect.Type) reflect.Type {
	for t.Kind() == reflect.Ptr {
		t = t.Elem()
	}
	return t
}
func ValidatePtr(v *reflect.Value) error {
	if !v.IsValid() || v.Kind() != reflect.Ptr || v.IsNil() {
		return fmt.Errorf("not a valid pointer: %v", v)
	}
	return nil
}