package nechotron

import (
	"strings"
)

type FilterFn func(u *Update) bool
type FilteredValue interface{}

func TextStartsWith(text string) FilterFn {
	return func(u *Update) bool {
		return strings.HasPrefix(u.Text(), text)
	}
}

func TextStartsWithAny(subs ...string) FilterFn {
	return func(u *Update) bool {
		text := u.Text()
		for _, sub := range subs {
			if strings.HasPrefix(text, sub) {
				return true
			}
		}
		return false
	}
}

func TextHas(text string) FilterFn {
	return func(u *Update) bool {
		return strings.Contains(u.Text(), text)
	}
}

func TextHasAny(subs ...string) FilterFn {
	return func(u *Update) bool {
		text := u.Text()
		for _, sub := range subs {
			if strings.Contains(text, sub) {
				return true
			}
		}
		return false
	}
}

func IsPrivate(u *Update) bool {
	return u.ChatID() > 0
}

func IsForum(u *Update) bool {
	return u.Chat().IsForum
}

func IsReply(u *Update) bool {
	return u.IsReply()
}

func IsUserAdmin(u *Update) bool {
	if IsPrivate(u) {
		return true
	}
	member, err := u.Bot.GetChatMember(u.ChatID(), u.From().ID)
	if err != nil {
		return false
	}
	return member.Result.Status == "administrator" || member.Result.Status == "creator"
}