package rest

import (
	"io"
	"log"
	"reflect"
	"strings"

	"git.ali33.ru/fcg-xvii/go-tools/json"
)

func findFileKey(m map[string]io.ReadCloser, key string) (io.Reader, bool) {
	key = camelToSnake(key)
	for fKey, val := range m {
		fKey = strings.Replace(fKey, ".", "_", -1)
		if key == fKey {
			return val, true
		}
	}
	return nil, false
}

func findKey(m map[string]any, key string) (val any, check bool) {
	if val, check = m[key]; !check {
		if !check {
			key = camelToSnake(key)
			val, check = m[key]
		}
	}
	return val, check
}

func serializeRequest(obj any, data json.Map, files map[string]io.ReadCloser, parent string) IErrorArgs {
	data.LogPretty()
	val := reflect.ValueOf(obj)
	if val.Kind() != reflect.Ptr {
		return NewErrPrtexpected(parent)
	}
	el := val.Elem()
	for i := 0; i < el.NumField(); i++ {
		required, isFile, arrived := false, false, false
		field := el.Type().Field(i)
		log.Println("------>", field)
		xField := el.Field(i)
		tag := field.Tag.Get("rest")
		if len(tag) > 0 {
			required = strings.Contains(tag, "required")
			isFile = strings.Contains(tag, "file")
		}
		if isFile {
			if f, check := findFileKey(files, field.Name); check {
				xField.Set(reflect.ValueOf(f))
				arrived = true
			}
		} else {
			if cval, check := findKey(data, field.Name); check {
				rVal := reflect.ValueOf(cval)
				switch {
				case xField.Kind() == reflect.Ptr:
					if rVal.Kind() != reflect.Map {
						return NewErrFieldType(field.Name, xField.Type().String(), rVal.String(), "expected json object")
					}
					rv := reflect.New(xField.Type().Elem())
					m := rVal.Convert(reflect.TypeOf(json.Map{})).Interface()
					if err := serializeRequest(rv.Interface(), m.(json.Map), files, field.Name); err != nil {
						return err
					}
					xField.Set(rv)
				default:
					if rVal.CanConvert(xField.Type()) {
						xField.Set(rVal.Convert(xField.Type()))
					} else {
						return NewErrFieldType(field.Name, xField.Type().String(), rVal.Kind().String(), "convert error")
					}
				}
				arrived = true
			}
		}
		if required && !arrived {
			return NewErrFieldRequired(field.Name)
		}
	}
	return nil
}