package builder

import (
	"fmt"
	"git.diulo.com/mogfee/kit/stringx"
	"reflect"
	"strings"
)

const dbTag = "db"

func RawFieldNames(in any) []string {
	out := make([]string, 0)
	v := reflect.ValueOf(in)
	if v.Kind() == reflect.Ptr {
		v = v.Elem()
	}
	if v.Kind() != reflect.Struct {
		panic(fmt.Errorf("ToMap only accepts structs; got %T", v))
	}
	typ := v.Type()
	for i := 0; i < v.NumField(); i++ {
		fi := typ.Field(i)
		if !stringx.IsFirstUpper(fi.Name) {
			continue
		}
		tagv := fi.Tag.Get(dbTag)
		switch tagv {
		case "-":
			continue
		case "":
			out = append(out, fmt.Sprintf("`%s`", fi.Name))
		default:
			if strings.Contains(tagv, ",") {
				tagv = strings.TrimSpace(strings.Split(tagv, ",")[0])
			}
			if tagv == "-" {
				continue
			}
			if len(tagv) == 0 {
				tagv = fi.Name
			}
			out = append(out, fmt.Sprintf("`%s`", tagv))
		}
	}
	return out
}