/*
Copyright (c) 2014-2024 VMware, Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package esx

import (
	"io"

	"github.com/vmware/govmomi/vim25/xml"
)

type Values map[string][]string

type Response struct {
	Info   *CommandInfoMethod `json:"info"`
	Values []Values           `json:"values"`
	String string             `json:"string"`
	Kind   string             `json:"-"`
}

func (v Values) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
	for {
		t, err := d.Token()
		if err != nil {
			if err == io.EOF {
				return nil
			}
			return err
		}

		if s, ok := t.(xml.StartElement); ok {
			t, err = d.Token()
			if err != nil {
				return err
			}

			key := s.Name.Local
			var val string
			if c, ok := t.(xml.CharData); ok {
				val = string(c)
			}
			v[key] = append(v[key], val)
		}
	}
}

func (s Values) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	tokens := []xml.Token{start}

	for key, val := range s {
		field := xml.StartElement{Name: xml.Name{Local: key}}
		for _, v := range val {
			tokens = append(tokens, field, xml.CharData(v), field.End())
		}
	}

	tokens = append(tokens, start.End())

	for _, t := range tokens {
		err := e.EncodeToken(t)
		if err != nil {
			return err
		}
	}

	return nil
}

func (v Values) Value(name string) string {
	if val, ok := v[name]; ok {
		if len(val) != 0 {
			return val[0]
		}
	}
	return ""
}

func (r *Response) Type(start xml.StartElement) string {
	for _, a := range start.Attr {
		if a.Name.Local == "type" {
			return a.Value
		}
	}
	return ""
}

func (r *Response) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
	stype := r.Type(start)

	if stype != "ArrayOfDataObject" {
		switch stype {
		case "xsd:string", "xsd:boolean", "xsd:long":
			return d.DecodeElement(&r.String, &start)
		}
		v := Values{}
		if err := d.DecodeElement(&v, &start); err != nil {
			return err
		}
		r.Values = append(r.Values, v)
		return nil
	}

	for {
		t, err := d.Token()
		if err != nil {
			if err == io.EOF {
				return nil
			}
			return err
		}

		if s, ok := t.(xml.StartElement); ok {
			if s.Name.Local == "DataObject" {
				v := Values{}
				if err := d.DecodeElement(&v, &s); err != nil {
					return err
				}
				r.Values = append(r.Values, v)
			}
		}
	}
}

func (r *Response) MarshalXML(e *xml.Encoder, _ xml.StartElement) error {
	kind := "ArrayOfDataObject"
	native := r.String != ""
	if native {
		kind = "xsd:" + r.Kind
	}

	start := xml.StartElement{
		Name: xml.Name{
			Space: "urn:vim25",
			Local: "obj",
		},
		Attr: []xml.Attr{
			{
				Name:  xml.Name{Local: "xmlns:xsd"},
				Value: "http://www.w3.org/2001/XMLSchema",
			},
			{
				Name:  xml.Name{Local: "xmlns:xsi"},
				Value: "http://www.w3.org/2001/XMLSchema-instance",
			},
			{
				Name:  xml.Name{Local: "xsi:type"},
				Value: kind,
			},
		},
	}

	if err := e.EncodeToken(start); err != nil {
		return err
	}

	var err error
	if native {
		err = e.EncodeToken(xml.CharData(r.String))
	} else {
		obj := xml.StartElement{
			Name: xml.Name{Local: "DataObject"},
			Attr: []xml.Attr{{
				Name:  xml.Name{Local: "xsi:type"},
				Value: r.Kind,
			}},
		}
		err = e.EncodeElement(r.Values, obj)
	}

	if err != nil {
		return err
	}

	return e.EncodeToken(start.End())
}