flag.gno

 1package boards2
 2
 3import (
 4	"strconv"
 5
 6	"gno.land/p/nt/avl"
 7)
 8
 9// DefaultFlaggingThreshold defines the default number of flags that hides flaggable items.
10const DefaultFlaggingThreshold = 1
11
12var gFlaggingThresholds avl.Tree // string(board ID) -> int
13
14type Flaggable interface {
15	// Flag adds a new flag to an item.
16	// It returns false when the user flagging already flagged the item.
17	Flag(user address, reason string) bool
18
19	// FlagsCount returns number of times item was flagged.
20	FlagsCount() int
21}
22
23// flagItem adds a flag to a flaggable item.
24// Returns whether flag count threshold is reached and item can be hidden.
25// Panics if flag count threshold was already reached.
26func flagItem(item Flaggable, user address, reason string, threshold int) bool {
27	if item.FlagsCount() >= threshold {
28		panic("item flag count threshold exceeded: " + strconv.Itoa(threshold))
29	}
30
31	if !item.Flag(user, reason) {
32		panic("item has been already flagged by " + user.String())
33	}
34
35	return item.FlagsCount() == threshold
36}
37
38func getFlaggingThreshold(bid BoardID) int {
39	if v, ok := gFlaggingThresholds.Get(bid.String()); ok {
40		return v.(int)
41	}
42	return DefaultFlaggingThreshold
43}