// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.

package goai

import (
	"reflect"

	"github.com/gogf/gf/v2/internal/json"
	"github.com/gogf/gf/v2/os/gstructs"
	"github.com/gogf/gf/v2/text/gstr"
)

// Response is specified by OpenAPI/Swagger 3.0 standard.
type Response struct {
	Description string  `json:"description"           yaml:"description"`
	Headers     Headers `json:"headers,omitempty"     yaml:"headers,omitempty"`
	Content     Content `json:"content,omitempty"     yaml:"content,omitempty"`
	Links       Links   `json:"links,omitempty"       yaml:"links,omitempty"`
}

// Responses is specified by OpenAPI/Swagger 3.0 standard.
type Responses map[string]ResponseRef

type ResponseRef struct {
	Ref   string
	Value *Response
}

func (r ResponseRef) MarshalJSON() ([]byte, error) {
	if r.Ref != "" {
		return formatRefToBytes(r.Ref), nil
	}
	return json.Marshal(r.Value)
}

type getResponseSchemaRefInput struct {
	BusinessStructName string      // The business struct name.
	ResponseObject     interface{} // Common response object.
	ResponseDataField  string      // Common response data field.
}

func (oai *OpenApiV3) getResponseSchemaRef(in getResponseSchemaRefInput) (*SchemaRef, error) {
	if in.ResponseObject == nil {
		return &SchemaRef{
			Ref: in.BusinessStructName,
		}, nil
	}

	var (
		dataFieldsPartsArray                                        = gstr.Split(in.ResponseDataField, ".")
		bizResponseStructSchemaRef, bizResponseStructSchemaRefExist = oai.Components.Schemas[in.BusinessStructName]
		schema, err                                                 = oai.structToSchema(in.ResponseObject)
	)
	if err != nil {
		return nil, err
	}
	if in.ResponseDataField == "" && bizResponseStructSchemaRefExist {
		for k, v := range bizResponseStructSchemaRef.Value.Properties {
			schema.Properties[k] = v
		}
	} else {
		structFields, _ := gstructs.Fields(gstructs.FieldsInput{
			Pointer:         in.ResponseObject,
			RecursiveOption: gstructs.RecursiveOptionEmbeddedNoTag,
		})
		for _, structField := range structFields {
			var (
				fieldName = structField.Name()
			)
			if jsonName := structField.TagJsonName(); jsonName != "" {
				fieldName = jsonName
			}
			switch len(dataFieldsPartsArray) {
			case 1:
				if structField.Name() == dataFieldsPartsArray[0] {
					schema.Properties[fieldName] = bizResponseStructSchemaRef
					break
				}
			default:
				if structField.Name() == dataFieldsPartsArray[0] {
					var (
						structFieldInstance = reflect.New(structField.Type().Type).Elem()
					)
					schemaRef, err := oai.getResponseSchemaRef(getResponseSchemaRefInput{
						BusinessStructName: in.BusinessStructName,
						ResponseObject:     structFieldInstance,
						ResponseDataField:  gstr.Join(dataFieldsPartsArray[1:], "."),
					})
					if err != nil {
						return nil, err
					}
					schema.Properties[fieldName] = *schemaRef
					break
				}
			}
		}
	}

	return &SchemaRef{
		Value: schema,
	}, nil
}