package mail

import (
	"fmt"
	"log"
	"strings"

	"github.com/emersion/go-imap/v2"
	client "github.com/emersion/go-imap/v2/imapclient"
	"github.com/logrusorgru/aurora/v4"
	"github.com/spf13/viper"

	"git.amok.space/yevhen/resource-scraper/helper/sugar"
)

type EmailService struct {
	User      string
	pass      string
	Err       error
	client    *client.Client
	Mailboxes []*imap.SelectData
	Messages  []*client.FetchMessageBuffer
}

func (s *EmailService) CheckErr(msg string, err error) bool {
	if err != nil {
		if sugar.IsDev() {
			sugar.LogError(err.Error())
		}
		s.Err = err
		return true
	}

	return false
}

func (s *EmailService) success(msg string) {
	if sugar.IsDev() {
		sugar.LogSuccess(msg)
	}
}

func (s *EmailService) Warn(msg string) {
	if sugar.IsDev() {
		sugar.LogWarning(msg)
	}
}

func (s *EmailService) Connect() {
	box := strings.Split(s.User, "@")
	mail := viper.GetStringMapString("mail." + box[1])

	conn, err := client.DialTLS(mail["dial-tls"], nil)
	if s.CheckErr("DialTLS", err) {
		return
	}

	s.client = conn
	s.pass = mail[s.User]
	s.success("connected to " + mail["dial-tls"])

	//defer s.Logout()
}

func (s *EmailService) Login() {
	s.Connect()

	err := s.client.Login(s.User, s.pass).Wait()
	if s.CheckErr("Login", err) {
		return
	}
	s.success(s.User + " logged")
}

func (s *EmailService) ListMailboxes(mailboxes []string) {
	selectOptions := &imap.SelectOptions{ReadOnly: true}

	for _, mailbox := range mailboxes {
		mbox, err := s.client.Select(mailbox, selectOptions).Wait()
		if s.CheckErr("Listing mailbox", err) {
			return
		}
		s.Mailboxes = append(s.Mailboxes, mbox)
	}

	if len(s.Mailboxes) == 0 {
		s.Warn(sugar.SqueezeLine("mailboxes " + strings.Join(mailboxes, ", ") + " not found"))
	}
}

func (s *EmailService) ListMessages(mailboxes []string, criteria *imap.SearchCriteria) {
	for _, mailbox := range mailboxes {
		mbox, err := s.client.Select(mailbox, nil).Wait()
		if s.CheckErr("Listing mailbox", err) {
			continue
		}

		seqs, err := s.client.UIDSearch(criteria, nil).Wait()
		if s.CheckErr("UIDSearch", err) {
			return
		}

		seqSet := imap.SeqSet{}
		seqSet.AddRange(1, mbox.NumMessages)
		if len(seqs.AllUIDs()) == 0 {
			s.Warn("no messages found in mailbox: " + mailbox)
			continue
		}
		s.success(fmt.Sprintf("Search complete, found %d messages: %+v", len(seqs.AllUIDs()), mbox.UIDNext))

		fetchOptions := &imap.FetchOptions{
			Envelope:      true,
			Flags:         true,
			BodyStructure: &imap.FetchItemBodyStructure{Extended: true},
			BodySection:   []*imap.FetchItemBodySection{{Peek: true, Part: []int{2}}},
		}

		messages, err := s.client.Fetch(seqSet, fetchOptions).Collect()
		if s.CheckErr("Fetch", err) {
			continue
		}

		s.Messages = messages
	}
}

func (s *EmailService) LogOut() {
	err := s.client.Logout().Wait()
	if !s.CheckErr("failed to logout", err) {
		s.success("logged out successfully")
	}
}

func (s *EmailService) CreateMailbox(mailboxName string) {
	s.client.Create(mailboxName, nil)
}

func (s *EmailService) MailboxesList() {
	listCmd := s.client.List("", "%", &imap.ListOptions{
		ReturnStatus: &imap.StatusOptions{
			NumMessages: true,
			NumUnseen:   true,
		},
	})

	for {
		mbox := listCmd.Next()
		if mbox == nil {
			break
		}

		fmt.Printf("%+v\n", mbox)
	}

	if err := listCmd.Close(); err != nil {
		log.Fatalf("LIST command failed: %v", err)
	}
}

func (s *EmailService) MoveMessageToMailbox(msg *client.FetchMessageBuffer, status string) bool {
	movable := imap.SeqSet{}
	movable.AddNum(msg.SeqNum)
	mailbox := viper.GetStringMapString("stb.move-processed-to-mailbox")
	wait, err := s.client.Move(movable, mailbox[status]).Wait()
	if s.CheckErr("Moving to archive", err) {
		return false
	}

	fmt.Printf("Message %s moved, srcUIDs: %s, dstUIDs: %s\n", aurora.White(msg.Envelope.MessageID), aurora.Yellow(wait.SourceUIDs), aurora.Yellow(wait.DestUIDs))

	return true
}