package xmpp

import (
	"fmt"

	"dev.narayana.im/narayana/telegabber/persistence"
	"dev.narayana.im/narayana/telegabber/telegram"
	"dev.narayana.im/narayana/telegabber/xmpp/gateway"

	log "github.com/sirupsen/logrus"
	"gosrc.io/xmpp"
	"gosrc.io/xmpp/stanza"
)

func loginWizardPayload(bare string, requestForm *stanza.Form, resource string, action string) (payload *stanza.Command, cancelSend bool, returnSession *telegram.Client) {
	payload = &stanza.Command{
		SessionId: "loginwizard",
		Node:      "loginwizard",
	}

	session, ok := sessions[bare]
	if ok {
		returnSession = session

		var command string

		if requestForm == nil {
			session.StartLoginWizard(false)
			cancelSend = true
		} else if action == stanza.CommandActionComplete || action == stanza.CommandActionExecute {
			command = "/finish"
		} else {
			if len(requestForm.Fields) != 1 {
				setCommandPayloadError(payload, "Hey, don't tinker with the form!")
				return
			}
			field := requestForm.Fields[0]
			if field != nil {
				if len(field.ValuesList) < 1 {
					setCommandPayloadError(payload, "No value")
					return
				}
				value := field.ValuesList[0]
				switch field.Var {
				case "login", "code", "password", "preset":
					if field.Var == "preset" && value == "" {
						command = "/pass"
					} else {
						command = fmt.Sprintf("/%v %v", field.Var, value)
					}
				case "muc":
					fieldValue := persistence.NormalizeProperty(field.Var, value)
					command = fmt.Sprintf("/config muc %v", fieldValue)
				default:
					setCommandPayloadError(payload, "Unknown field")
					return
				}
			}
		}

		if command != "" {
			session.StartLoginWizard(true)
			response, success := session.ProcessTransportCommand(command, resource)
			if !success {
				setCommandPayloadError(payload, response)
				session.StopLoginWizard()
				return
			}

			cancelSend = true
		}
	} else {
		setCommandPayloadError(payload, fmt.Sprintf("Session is not initialized, add the transport (%v) to contacts first", gateway.Jid.Bare()))
	}

	return
}

func sendLoginWizardResponse(component *xmpp.Component, answer *stanza.IQ, session *telegram.Client) {
	payload := &stanza.Command{
		SessionId: "loginwizard",
		Node:      "loginwizard",
	}

	nextStage := telegram.LoginStageLogin
	if session != nil {
		nextStage = session.GetLoginWizardNextStage()
	}
	log.Debugf("nextStage: %v", nextStage)

	if nextStage == telegram.LoginStageNone || nextStage == telegram.LoginStageCancel {
		setCommandPayloadError(payload, "Cancelled")
		session.StopLoginWizard()
	} else if nextStage == telegram.LoginStageSuccess {
		payload.Status = stanza.CommandStatusCompleted
		session.StopLoginWizard()
	} else {
		required := ""
		var fieldType string
		var finishAction bool
		var options []stanza.Option
		var note string

		switch nextStage {
		case telegram.LoginStagePreset:
			fieldType = stanza.FieldTypeListSingle
			finishAction = true
			options = []stanza.Option{
				stanza.Option{
					ValuesList: []string{""},
				},
				stanza.Option{
					Label:      "Modern",
					ValuesList: []string{"modern"},
				},
				stanza.Option{
					Label:      "Classic",
					ValuesList: []string{"classic"},
				},
			}
			note = "Do you want to use a config preset?\nModern enables brand new XMPP features,\nClassic targets legacy clients stuck in 00s."
		case telegram.LoginStageMUC:
			fieldType = stanza.FieldTypeBool
			finishAction = true

			value, err := session.Session.Get("muc")
			if err != nil {
				log.Error("Achtung! Programming error in retrieving MUC config option")
				value = "false"
			}

			options = append(options, stanza.Option{
				ValuesList: []string{value},
			})
			note = "Enable MUCs? Telegabber still supports the legacy group-to-PM mapping too."
		}

		form := stanza.Form{
			Type:  stanza.FormTypeForm,
			Title: "Login Wizard",
			Fields: []*stanza.Field{
				&stanza.Field{
					Var:      string(nextStage),
					Label:    string(nextStage),
					Required: &required,
					Type:     fieldType,
					Options:  options,
				},
			},
		}
		payload.Status = stanza.CommandStatusExecuting
		payload.CommandElements = append(payload.CommandElements, &form)

		actions := stanza.Actions{
			Next: &struct{}{},
		}
		if finishAction {
			actions.Complete = &struct{}{}
		}
		payload.CommandElements = append(payload.CommandElements, &actions)

		if note != "" {
			payload.CommandElements = append(payload.CommandElements, &stanza.Note{
				Text: note,
				Type: stanza.CommandNoteTypeInfo,
			})
		}
	}

	answer.Payload = payload

	gateway.ResumableSend(component, answer)
}