package handler

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/internal/locale"
	"github.com/mymmrac/telego"
	tu "github.com/mymmrac/telego/telegoutil"
	"golang.org/x/text/language"
)

const MaxChatMembers = 32

type ChatMemberUpdatedHandler struct {
	app iface.App
}

func NewChatMemberUpdatedHandler(app iface.App) *ChatMemberUpdatedHandler {
	return &ChatMemberUpdatedHandler{app: app}
}

func (h *ChatMemberUpdatedHandler) Handle(wh telego.Update) error {
	cm := wh.MyChatMember
	if !cm.OldChatMember.MemberIsMember() && cm.OldChatMember.MemberUser().ID == h.app.TGProfile().ID &&
		cm.NewChatMember.MemberIsMember() && cm.NewChatMember.MemberUser().ID == h.app.TGProfile().ID {
		return h.handleAddToChat(wh.MyChatMember.Chat)
	}
	if cm.OldChatMember.MemberIsMember() && cm.OldChatMember.MemberUser().ID == h.app.TGProfile().ID &&
		!cm.NewChatMember.MemberIsMember() && cm.NewChatMember.MemberUser().ID == h.app.TGProfile().ID {
		return h.handleRemoveFromChat(wh.MyChatMember.Chat)
	}

	h.leaveChat(wh.MyChatMember.Chat.ID)
	return nil
}

func (h *ChatMemberUpdatedHandler) handleAddToChat(tgChat telego.Chat) error {
	cr := h.app.DB().ForChat()
	chat, err := cr.ByTelegramID(tgChat.ID)
	if err != nil {
		h.sendInternalError(tgChat.ID, nil)
		h.leaveChat(tgChat.ID)
		return err
	}

	user, err := h.getRegisteredAdmin(tgChat.ID)
	if err != nil {
		h.sendInternalError(tgChat.ID, nil)
		h.leaveChat(tgChat.ID)
		return err
	}
	if user == nil || user.ID == 0 {
		_, err = h.app.TG().SendMessage(&telego.SendMessageParams{
			ChatID:    tu.ID(tgChat.ID),
			Text:      h.app.Localizer(language.English.String()).Message("you_should_register_first"),
			ParseMode: telego.ModeMarkdown,
		})
		h.leaveChat(tgChat.ID)
		return err
	}

	loc := h.app.Localizer(user.Language)

	totalMembers, err := h.app.TG().GetChatMemberCount(&telego.GetChatMemberCountParams{
		ChatID: tu.ID(tgChat.ID),
	})
	if err != nil {
		h.sendInternalError(tgChat.ID, nil)
		h.leaveChat(tgChat.ID)
		return err
	}
	if *totalMembers > MaxChatMembers {
		_, err = h.app.TG().SendMessage(&telego.SendMessageParams{
			ChatID:    tu.ID(tgChat.ID),
			Text:      loc.Template("too_many_members_in_the_group", map[string]interface{}{"Limit": MaxChatMembers}),
			ParseMode: telego.ModeMarkdown,
		})
		h.leaveChat(tgChat.ID)
		return err
	}

	if chat == nil || chat.ID == 0 {
		chat = &model.Chat{
			TelegramID: tgChat.ID,
			UserID:     user.ID,
		}
		err := cr.Save(chat)
		if err != nil {
			h.sendInternalError(tgChat.ID, loc)
			h.leaveChat(tgChat.ID)
			return err
		}
	} else {
		chat.UserID = user.ID
		err := h.app.DB().ForIntegration().DeleteForChat(chat.ID)
		if err != nil {
			h.sendInternalError(tgChat.ID, loc)
			h.leaveChat(tgChat.ID)
			return err
		}
		err = cr.Save(chat)
		if err != nil {
			h.sendInternalError(tgChat.ID, loc)
			h.leaveChat(tgChat.ID)
			return err
		}
	}

	_, _ = h.app.TG().SendMessage(&telego.SendMessageParams{
		ChatID:    tu.ID(user.ChatID),
		Text:      loc.Template("bot_was_added", map[string]interface{}{"Name": tgChat.Title}),
		ParseMode: telego.ModeMarkdown,
	})

	return h.sendKeyboardChooser(tgChat, user, loc)
}

func (h *ChatMemberUpdatedHandler) handleRemoveFromChat(tgChat telego.Chat) error {
	cr := h.app.DB().ForChat()
	chat, err := cr.ByTelegramID(tgChat.ID)
	if err != nil {
		return err
	}
	if chat != nil && chat.ID > 0 {
		user, _ := h.app.DB().ForUser().ByID(chat.UserID)
		if user != nil && user.ID > 0 && user.ChatID > 0 {
			_, _ = h.app.TG().SendMessage(&telego.SendMessageParams{
				ChatID: tu.ID(user.ChatID),
				Text: h.app.Localizer(user.Language).Template(
					"bot_was_removed_from_group", map[string]interface{}{"Name": tgChat.Title}),
			})
		}
		return cr.Delete(chat)
	}
	return nil
}

func (h *ChatMemberUpdatedHandler) sendKeyboardChooser(chat telego.Chat, user *model.User, loc locale.Localizer) error {
	_, err := h.app.TG().SendMessage(&telego.SendMessageParams{
		ChatID:    tu.ID(user.ChatID),
		Text:      loc.Template("choose_keyboard", map[string]interface{}{"Name": chat.Title}),
		ParseMode: telego.ModeMarkdown,
		ReplyMarkup: &telego.InlineKeyboardMarkup{
			InlineKeyboard: [][]telego.InlineKeyboardButton{
				{
					{
						Text: loc.Message("standard_vote_keyboard"),
						CallbackData: util.NewKeyboardChooserPayload(
							user.TelegramID, chat.ID, model.StandardKeyboard).String(),
					},
				},
				{
					{
						Text: loc.Message("sp_vote_keyboard"),
						CallbackData: util.NewKeyboardChooserPayload(
							user.TelegramID, chat.ID, model.StoryPointsKeyboard).String(),
					},
				},
			},
		},
	})
	return err
}

func (h *ChatMemberUpdatedHandler) getRegisteredAdmin(chatID int64) (*model.User, error) {
	admins, err := h.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 := h.app.DB().ForUser().ByTelegramIDs(adminIDs)
	if err != nil {
		return nil, err
	}
	if len(dbAdmins) > 0 {
		return &dbAdmins[0], nil
	}
	return nil, nil
}

func (h *ChatMemberUpdatedHandler) leaveChat(chatID int64) {
	_ = h.app.TG().LeaveChat(&telego.LeaveChatParams{
		ChatID: tu.ID(chatID),
	})
}

func (h *ChatMemberUpdatedHandler) sendInternalError(chatID int64, loc locale.Localizer) {
	if loc == nil {
		loc = h.app.Localizer(language.English.String())
	}
	_, _ = h.app.TG().SendMessage(&telego.SendMessageParams{
		ChatID:    tu.ID(chatID),
		Text:      loc.Message("internal_error"),
		ParseMode: telego.ModeMarkdown,
	})
}