package telegram

import (
	"dev.narayana.im/narayana/telegabber/xmpp/gateway"

	log "github.com/sirupsen/logrus"
	"github.com/zelenin/go-tdlib/client"
)

type LoginStage string
const (
	LoginStageNone     LoginStage = ""
	LoginStageLogin    LoginStage = "login"
	LoginStageCode     LoginStage = "code"
	LoginStagePassword LoginStage = "password"
	LoginStagePreset   LoginStage = "preset"
	LoginStageMUC      LoginStage = "muc"
	LoginStageSuccess  LoginStage = "success"
	LoginStageCancel   LoginStage = "cancel"
)

// setLoginStage updates loginState and triggers session initialization on login sucess
func (c *Client) setLoginStage(stage LoginStage) {
	c.loginStage = stage
	switch c.loginStage {
	case LoginStageSuccess, LoginStageCancel:
		c.locks.loginFinish.Done()
	}
}

// StartLoginWizard initiates a loginWizard object
func (c *Client) StartLoginWizard(inCommand bool) {
	if c.loginWizard == nil {
		c.loginWizard = &loginWizardMetadata{
			nextStage:   make(chan LoginStage, 1),
			commandSent: inCommand,
		}
	} else {
		c.loginWizard.commandSent = inCommand
	}
}

// StopLoginWizard safely destroys the loginWizard object
func (c *Client) StopLoginWizard() {
	c.locks.loginWizardReadLock.Lock()
	c.locks.loginWizardWriteLock.Lock()
	if c.loginWizard != nil {
		close(c.loginWizard.nextStage)
		c.loginWizard = nil
	}
	c.locks.loginWizardReadLock.Unlock()
	c.locks.loginWizardWriteLock.Unlock()
}

// GetLoginWizardNextStage waits for the next stage from the channel
func (c *Client) GetLoginWizardNextStage() LoginStage {
	c.locks.loginWizardReadLock.Lock()
	defer c.locks.loginWizardReadLock.Unlock()

	if c.loginWizard != nil {
		if c.loginWizard.commandSent {
			log.Debugf("waiting for nextStage...")
			nextStage := <-c.loginWizard.nextStage
			c.loginWizard.commandSent = false
			c.loginWizard.chanBusy = false
			log.Debugf("yielded stage %v", nextStage)
			return nextStage
		} else {
			log.Debugf("commandSent is false")

			if c.lastAuthorizationStateType == client.TypeAuthorizationStateWaitPhoneNumber ||
				c.lastAuthorizationStateType == client.TypeAuthorizationStateClosing ||
				c.Session.Login == "" {
				return LoginStageLogin
			}
			switch c.lastAuthorizationStateType {
			case client.TypeAuthorizationStateWaitCode:
				return LoginStageCode
			case client.TypeAuthorizationStateWaitPassword:
				return LoginStagePassword
			}

			switch c.loginStage {
			case LoginStagePreset:
				return LoginStageMUC
			case LoginStageMUC:
				return LoginStageNone
			}
		}
	}

	return LoginStageNone
}

func (c *Client) wizardStageOrPrompt(stage LoginStage, message string) {
	log.Debugf("loginStage: %v stage: %v", c.loginStage, stage)
	if c.loginStage == stage {
		return
	}

	c.locks.loginWizardWriteLock.Lock()
	c.setLoginStage(stage)
	if c.loginWizard == nil {
		c.locks.loginWizardWriteLock.Unlock()
		if message != "" {
			gateway.SendServiceMessage(c.jid, message, c.xmpp)
		}
	} else {
		if !c.loginWizard.chanBusy {
			log.Debugf("writing wizard stage %v", stage)
			c.loginWizard.nextStage <- stage
		} else {
			log.Warnf("Skipping stage %v, wizard cannot keep up", stage)
		}
		c.loginWizard.chanBusy = true
		c.locks.loginWizardWriteLock.Unlock()
	}
}