package json

import (
	"encoding/json"
	"fmt"
	"reflect"

	cur "git.loafle.net/commons_go/util/reflect"
)

func convertParamsToStringArray(params []interface{}) ([]string, error) {
	var values []string
	if nil == params || 0 == len(params) {
		return values, nil
	}

	for i, param := range params {
		t := reflect.TypeOf(param)
		switch t.Kind() {
		case reflect.String:
			values = append(values, param.(string))
		case reflect.Array, reflect.Slice, reflect.Map, reflect.Struct:
			b, err := json.Marshal(param)
			if nil != err {
				return nil, err
			}
			values = append(values, string(b))
		case reflect.Ptr:
			if t.Elem().Kind() != reflect.Struct {
				return nil, fmt.Errorf("Pointer of param[%d] is permitted only Struct type", i)
			}
			b, err := json.Marshal(param)
			if nil != err {
				return nil, err
			}
			values = append(values, string(b))
		default:
			s, err := cur.ConvertToString(param)
			if nil != err {
				return nil, fmt.Errorf("String conversion of param[%d] has been failed [%v]", i, err)
			}
			values = append(values, s)
		}
	}
	return values, nil
}