package fsmwizard

import (
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/internal/db/model"
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/internal/handler/iface"
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/internal/handler/util"
	"gitea.neur0tx.site/Neur0toxine/vegapokerbot/pkg/fsm"
	"github.com/mymmrac/telego"
	tu "github.com/mymmrac/telego/telegoutil"
	"golang.org/x/text/language"
)

const MaxChatMembers = 32

const AddChatMemberStateID fsm.StateID = "add_chat_member"

type AddChatMemberState struct {
	State
}

func NewAddChatMemberState(app iface.App) fsm.IState[Wizard] {
	return &AddChatMemberState{newBase(app)}
}

func (s *AddChatMemberState) Enter(pl *Wizard, mc fsm.MachineControls[*Wizard]) error {
	if pl.Data.MyChatMember == nil {
		s.Move(mc, WaitingForMemberWebhookStateID, pl)
	}
	return nil
}

func (s *AddChatMemberState) Handle(pl *Wizard, mc fsm.MachineControls[*Wizard]) {
	next := WaitingForMemberWebhookStateID
	defer func() {
		s.Move(mc, next, pl)
	}()

	cr := s.App.DB().ForChat()
	tgChat := pl.Data.MyChatMember.Chat
	user, chat := s.getUserAndChat(tgChat)
	if user == nil || chat == nil {
		return
	}

	s.Payload.Loc = s.Localizer(user.Language)
	if s.handleTooManyMembers(tgChat.ID) {
		return
	}

	if chat.ID == 0 {
		chat = &model.Chat{
			TelegramID: tgChat.ID,
			UserID:     user.ID,
		}
		err := cr.Save(chat)
		if err != nil {
			s.curseAndLeave(tgChat.ID, err)
			return
		}
	} else {
		chat.UserID = user.ID
		err := s.App.DB().ForIntegration().DeleteForChat(chat.ID)
		if err != nil {
			s.curseAndLeave(tgChat.ID, err)
			return
		}
		err = cr.Save(chat)
		if err != nil {
			s.curseAndLeave(tgChat.ID, err)
			return
		}
	}

	_, err := s.App.TG().SendMessage(&telego.SendMessageParams{
		ChatID:    tu.ID(user.ChatID),
		Text:      s.Payload.Loc.Template("bot_was_added", map[string]interface{}{"Name": tgChat.Title}),
		ParseMode: telego.ModeMarkdown,
	})
	s.LogError(err)
	pl.User = user
	pl.TGChat = tgChat
	next = KeyboardChooserStateID
}

func (s *AddChatMemberState) handleTooManyMembers(chatID int64) bool {
	totalMembers, err := s.App.TG().GetChatMemberCount(&telego.GetChatMemberCountParams{
		ChatID: tu.ID(chatID),
	})
	if err != nil {
		s.curseAndLeave(chatID, err)
		return true
	}
	if *totalMembers > MaxChatMembers {
		_, err = s.App.TG().SendMessage(&telego.SendMessageParams{
			ChatID: tu.ID(chatID),
			Text: s.Payload.Loc.Template(
				"too_many_members_in_the_group", map[string]interface{}{"Limit": MaxChatMembers}),
			ParseMode: telego.ModeMarkdown,
		})
		s.leaveChat(chatID)
		s.LogError(err)
		return true
	}
	return false
}

func (s *AddChatMemberState) getUserAndChat(tgChat telego.Chat) (*model.User, *model.Chat) {
	cr := s.App.DB().ForChat()
	chat, err := cr.ByTelegramID(tgChat.ID)
	if err != nil {
		s.curseAndLeave(tgChat.ID, err)
		return nil, nil
	}

	user, err := s.getRegisteredAdmin(tgChat.ID)
	if err != nil {
		s.curseAndLeave(tgChat.ID, err)
		return nil, nil
	}
	if user == nil || user.ID == 0 {
		_, err = s.App.TG().SendMessage(&telego.SendMessageParams{
			ChatID: tu.ID(tgChat.ID),
			Text: s.Localizer(language.English.String()).
				Template("you_should_register_first", map[string]interface{}{"Name": s.App.TGProfile().Username}),
			ParseMode: telego.ModeMarkdown,
		})
		s.leaveChat(tgChat.ID)
		s.LogError(err)
		return nil, nil
	}
	return user, chat
}

func (s *AddChatMemberState) curseAndLeave(chatID int64, err error) {
	s.LogError(util.SendInternalError(s.App.TG(), chatID, s.Localizer()))
	s.leaveChat(chatID)
	s.LogError(err)
}

func (s *AddChatMemberState) getRegisteredAdmin(chatID int64) (*model.User, error) {
	admins, err := s.App.TG().GetChatAdministrators(&telego.GetChatAdministratorsParams{
		ChatID: tu.ID(chatID),
	})
	if err != nil {
		return nil, err
	}
	adminIDs := make([]int64, len(admins))
	for i, admin := range admins {
		adminIDs[i] = admin.MemberUser().ID
	}
	dbAdmins, err := s.App.DB().ForUser().ByTelegramIDs(adminIDs)
	if err != nil {
		return nil, err
	}
	if len(dbAdmins) > 0 {
		return &dbAdmins[0], nil
	}
	return nil, nil
}

func (s *AddChatMemberState) leaveChat(chatID int64) {
	s.LogError(s.App.TG().LeaveChat(&telego.LeaveChatParams{
		ChatID: tu.ID(chatID),
	}))
}

func (s *AddChatMemberState) ID() fsm.StateID {
	return AddChatMemberStateID
}