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Add Wild Draw Four challenge mechanic and bot bluffing

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- When a WD4 is played, the victim can challenge or accept
- Challenge succeeds if the WD4 player had a card matching the
  previous color — they draw 4 instead
- Challenge fails: victim draws 6 (4 + 2 penalty)
- Bot as victim: challenges probabilistically based on opponent
  hand size (10-70% chance, more cards = more likely to challenge)
- Bot as player: 20% chance to illegally play WD4 when it has
  matching color cards, making challenges meaningful against it
- Auto-play defaults to accepting (safe option)
- Challenge phase integrates with existing turn timer

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
prosolis
2026-03-19 22:18:30 -07:00
parent b9237181b1
commit 20332d69d6
2 changed files with 217 additions and 21 deletions
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7
internal/plugin/uno.go
View File

@@ -1030,6 +1030,13 @@ func botPickNormal(hand []unoCard, topColor unoColor, playable []int, opponentMi
}
}
// Sometimes play WD4 even when we have other options (20% chance)
// This makes the challenge mechanic meaningful against the bot.
if len(wd4s) > 0 && (len(actions) > 0 || len(numbers) > 0) && rand.IntN(5) == 0 {
idx := wd4s[0]
return hand[idx], idx
}
// Save WD4 unless opponent is close to winning
if opponentMinCards > 3 {
if len(actions) > 0 {

217
internal/plugin/uno_multi.go
View File

@@ -23,6 +23,7 @@ const (
unoMultiPhasePlay unoMultiPhase = iota
unoMultiPhaseChooseColor // active player must pick a color
unoMultiPhaseDrawnPlayable // active player drew a playable card, yes/no
unoMultiPhaseChallenge // next player may challenge a Wild Draw Four
)
type unoMultiPlayer struct {
@@ -48,6 +49,11 @@ type unoMultiGame struct {
phase unoMultiPhase
drawnCard *unoCard // card drawn this turn
pendingCard *unoCard // wild waiting for color
// Wild Draw Four challenge state
wd4Player *unoMultiPlayer // who played the WD4
wd4Victim *unoMultiPlayer // who can challenge
wd4PrevColor unoColor // color before the wild was played
turns int
turnID int // monotonic, used to invalidate stale timers
startedAt time.Time
@@ -717,6 +723,9 @@ func (p *UnoPlugin) handleMultiDMInput(ctx MessageContext, game *unoMultiGame) e
}
switch game.phase {
case unoMultiPhaseChallenge:
return p.handleMultiChallengeInput(game, player, input)
case unoMultiPhaseChooseColor:
return p.handleMultiColorChoice(game, player, input)
@@ -748,6 +757,20 @@ func (p *UnoPlugin) handleMultiDMInput(ctx MessageContext, game *unoMultiGame) e
// Play handlers
// ---------------------------------------------------------------------------
func (p *UnoPlugin) handleMultiChallengeInput(game *unoMultiGame, player *unoMultiPlayer, input string) error {
switch input {
case "challenge", "c":
name := p.unoDisplayName(player.userID)
p.SendMessage(game.roomID, fmt.Sprintf("⚡ %s challenges the Wild Draw Four!", name))
p.resolveWD4Challenge(game, true)
case "accept", "a":
p.resolveWD4Challenge(game, false)
default:
p.SendMessage(player.dmRoomID, "Type **challenge** or **accept**.")
}
return nil
}
func (p *UnoPlugin) handleMultiPlayerPlay(game *unoMultiGame, player *unoMultiPlayer, idx int) error {
card := player.hand[idx]
@@ -784,6 +807,9 @@ func (p *UnoPlugin) handleMultiPlayerPlay(game *unoMultiGame, player *unoMultiPl
// Wild — need color choice
if card.Value == unoWildCard || card.Value == unoWildDrawFour {
game.pendingCard = &card
if card.Value == unoWildDrawFour {
game.wd4PrevColor = game.topColor
}
game.phase = unoMultiPhaseChooseColor
p.SendMessage(player.dmRoomID,
fmt.Sprintf("You played **%s**! Choose a color:\n1. 🟥 Red\n2. 🟦 Blue\n3. 🟨 Yellow\n4. 🟩 Green", card.Value))
@@ -906,6 +932,9 @@ func (p *UnoPlugin) handleMultiDrawnPlayable(game *unoMultiGame, player *unoMult
if drawnCard.Value == unoWildCard || drawnCard.Value == unoWildDrawFour {
game.pendingCard = &drawnCard
if drawnCard.Value == unoWildDrawFour {
game.wd4PrevColor = game.topColor
}
game.phase = unoMultiPhaseChooseColor
p.SendMessage(player.dmRoomID,
fmt.Sprintf("You played **%s**! Choose a color:\n1. 🟥 Red\n2. 🟦 Blue\n3. 🟨 Yellow\n4. 🟩 Green", drawnCard.Value))
@@ -935,6 +964,7 @@ type cardEffectResult struct {
skippedName string // non-empty if a player was skipped
reversed bool // true if direction was reversed
drawnCount int // cards drawn by the victim (2 or 4)
needsChallenge bool // true if WD4 challenge phase should start
}
// applyCardEffects applies skip/reverse/draw effects and advances the turn.
@@ -979,13 +1009,8 @@ func (p *UnoPlugin) applyCardEffects(game *unoMultiGame, card unoCard) cardEffec
game.turnID++
case unoWildDrawFour:
drawn := game.draw(4)
nextPlayer.hand = append(nextPlayer.hand, drawn...)
result.needsChallenge = true
result.skippedName = nextName
result.drawnCount = 4
game.currentIdx = nextIdx
game.currentIdx = game.nextActiveIdx()
game.turnID++
default:
game.currentIdx = game.nextActiveIdx()
@@ -997,7 +1022,9 @@ func (p *UnoPlugin) applyCardEffects(game *unoMultiGame, card unoCard) cardEffec
// writeEffectLines appends human-readable effect descriptions to a string builder.
func writeEffectLines(sb *strings.Builder, eff cardEffectResult) {
if eff.drawnCount > 0 {
if eff.needsChallenge {
sb.WriteString(fmt.Sprintf("\n %s may challenge! ⚡", eff.skippedName))
} else if eff.drawnCount > 0 {
sb.WriteString(fmt.Sprintf("\n %s draws %d and is skipped!", eff.skippedName, eff.drawnCount))
} else if eff.skippedName != "" && eff.reversed {
sb.WriteString(fmt.Sprintf("\n %s is skipped! (reverse)", eff.skippedName))
@@ -1017,6 +1044,18 @@ func (p *UnoPlugin) applyAndAnnounce(game *unoMultiGame, player *unoMultiPlayer,
eff := p.applyCardEffects(game, card)
writeEffectLines(&roomMsg, eff)
// UNO announcement
if len(player.hand) == 1 && player.calledUno {
roomMsg.WriteString(fmt.Sprintf("\n %s calls UNO! 🔥", name))
}
// Wild Draw Four — enter challenge phase
if eff.needsChallenge {
p.SendMessage(game.roomID, roomMsg.String())
p.startWD4Challenge(game, player)
return
}
// Book state commentary (occasionally)
if game.turns%4 == 0 {
if changed := game.updateBookState(); changed {
@@ -1028,11 +1067,6 @@ func (p *UnoPlugin) applyAndAnnounce(game *unoMultiGame, player *unoMultiPlayer,
}
}
// UNO announcement
if len(player.hand) == 1 && player.calledUno {
roomMsg.WriteString(fmt.Sprintf("\n %s calls UNO! 🔥", name))
}
// Next player
nextUp := game.currentPlayer()
nextUpName := p.unoDisplayName(nextUp.userID)
@@ -1045,6 +1079,127 @@ func (p *UnoPlugin) applyAndAnnounce(game *unoMultiGame, player *unoMultiPlayer,
p.executeMultiTurn(game)
}
// ---------------------------------------------------------------------------
// Wild Draw Four challenge
// ---------------------------------------------------------------------------
// startWD4Challenge enters the challenge phase. The victim can challenge or accept.
// Caller must hold game.mu.
func (p *UnoPlugin) startWD4Challenge(game *unoMultiGame, wd4Player *unoMultiPlayer) {
nextIdx := game.nextActiveIdx()
victim := game.players[nextIdx]
game.wd4Player = wd4Player
game.wd4Victim = victim
game.phase = unoMultiPhaseChallenge
game.currentIdx = nextIdx
game.turnID++
playerName := p.unoDisplayName(wd4Player.userID)
if wd4Player.isBot {
playerName = unoBotName()
}
if victim.isBot {
// Bot decides whether to challenge
p.botHandleWD4Challenge(game)
return
}
p.SendMessage(victim.dmRoomID,
fmt.Sprintf("⚡ **%s** played Wild Draw Four!\nYou can **challenge** — if they had a %s %s card, they draw 4 instead.\nIf the challenge fails, you draw 6.\n\nType **challenge** or **accept**.",
playerName, game.wd4PrevColor.Emoji(), game.wd4PrevColor))
p.startMultiAutoPlayTimer(game)
}
// resolveWD4Challenge resolves the challenge. Caller must hold game.mu.
func (p *UnoPlugin) resolveWD4Challenge(game *unoMultiGame, challenged bool) {
wd4Player := game.wd4Player
victim := game.wd4Victim
wd4Name := p.unoDisplayName(wd4Player.userID)
if wd4Player.isBot {
wd4Name = unoBotName()
}
victimName := p.unoDisplayName(victim.userID)
if victim.isBot {
victimName = unoBotName()
}
// Clear challenge state
game.wd4Player = nil
game.wd4Victim = nil
game.phase = unoMultiPhasePlay
if !challenged {
// Victim accepts — draw 4, get skipped
drawn := game.draw(4)
victim.hand = append(victim.hand, drawn...)
p.SendMessage(game.roomID,
fmt.Sprintf("🃏 %s accepts the Wild Draw Four. Draws 4 and is skipped!", victimName))
game.currentIdx = game.nextActiveIdx()
game.turnID++
p.executeMultiTurn(game)
return
}
// Check if the WD4 player had a card matching the previous color
hadMatch := false
for _, c := range wd4Player.hand {
if c.Color == game.wd4PrevColor {
hadMatch = true
break
}
}
if hadMatch {
// Challenge succeeds — WD4 player drew illegally, they draw 4
drawn := game.draw(4)
wd4Player.hand = append(wd4Player.hand, drawn...)
p.SendMessage(game.roomID,
fmt.Sprintf("⚡ **Challenge successful!** %s had a %s %s card. %s draws 4!",
wd4Name, game.wd4PrevColor.Emoji(), game.wd4PrevColor, wd4Name))
// Victim is NOT skipped — turn continues from victim
game.turnID++
p.executeMultiTurn(game)
} else {
// Challenge fails — victim draws 6 (4 + 2 penalty)
drawn := game.draw(6)
victim.hand = append(victim.hand, drawn...)
p.SendMessage(game.roomID,
fmt.Sprintf("⚡ **Challenge failed!** %s played legally. %s draws 6!",
wd4Name, victimName))
// Victim is skipped
game.currentIdx = game.nextActiveIdx()
game.turnID++
p.executeMultiTurn(game)
}
}
// botHandleWD4Challenge decides whether the bot challenges a WD4. Caller must hold game.mu.
func (p *UnoPlugin) botHandleWD4Challenge(game *unoMultiGame) {
// More cards = more likely they had a matching color = more likely to challenge.
// 1-3 cards: 10%, 4-5: 30%, 6-7: 50%, 8+: 70%
cards := len(game.wd4Player.hand)
threshold := 10
if cards >= 8 {
threshold = 70
} else if cards >= 6 {
threshold = 50
} else if cards >= 4 {
threshold = 30
}
challenged := rand.IntN(100) < threshold
bn := unoBotName()
if challenged {
p.SendMessage(game.roomID, fmt.Sprintf("⚡ %s challenges the Wild Draw Four!", bn))
} else {
p.SendMessage(game.roomID, fmt.Sprintf("🃏 %s accepts the Wild Draw Four.", bn))
}
p.resolveWD4Challenge(game, challenged)
}
// ---------------------------------------------------------------------------
// Bot turn (multiplayer)
// ---------------------------------------------------------------------------
@@ -1104,6 +1259,9 @@ func (p *UnoPlugin) botMultiTurn(game *unoMultiGame, roomBuf *strings.Builder) {
// Wild color choice
if card.Value == unoWildCard || card.Value == unoWildDrawFour {
if card.Value == unoWildDrawFour {
game.wd4PrevColor = game.topColor
}
game.topColor = botPickColor(bot.hand)
} else {
game.topColor = card.Color
@@ -1149,6 +1307,17 @@ func (p *UnoPlugin) botMultiTurn(game *unoMultiGame, roomBuf *strings.Builder) {
eff := p.applyCardEffects(game, card)
writeEffectLines(roomBuf, eff)
// WD4 challenge — flush buffer and enter challenge phase
if eff.needsChallenge {
if roomBuf.Len() > 0 {
p.SendMessage(game.roomID, roomBuf.String())
roomBuf.Reset()
}
game.turns++
p.startWD4Challenge(game, bot)
return
}
game.turns++
}
@@ -1249,6 +1418,13 @@ func (p *UnoPlugin) autoPlayMultiTurn(game *unoMultiGame, player *unoMultiPlayer
name := p.unoDisplayName(player.userID)
switch game.phase {
case unoMultiPhaseChallenge:
// Auto-play: accept the WD4 (safe default)
p.SendMessage(player.dmRoomID, "*Auto-played:* Accepted Wild Draw Four.")
p.SendMessage(game.roomID, fmt.Sprintf("🃏 *%s was auto-played.* Accepts the Wild Draw Four.", name))
p.resolveWD4Challenge(game, false)
return
case unoMultiPhaseChooseColor:
// Auto-pick most common color
color := botPickColor(player.hand)
@@ -1287,6 +1463,9 @@ func (p *UnoPlugin) autoPlayMultiTurn(game *unoMultiGame, player *unoMultiPlayer
game.turns++
if drawnCard.Value == unoWildCard || drawnCard.Value == unoWildDrawFour {
if drawnCard.Value == unoWildDrawFour {
game.wd4PrevColor = game.topColor
}
color := botPickColor(player.hand)
game.topColor = color
p.SendMessage(player.dmRoomID, fmt.Sprintf("*Auto-played:* %s (chose %s %s).", drawnCard.Display(), color.Emoji(), color))
@@ -1343,6 +1522,9 @@ func (p *UnoPlugin) autoPlayMultiTurn(game *unoMultiGame, player *unoMultiPlayer
game.turns++
if card.Value == unoWildCard || card.Value == unoWildDrawFour {
if card.Value == unoWildDrawFour {
game.wd4PrevColor = game.topColor
}
color := botPickColor(player.hand)
game.topColor = color
p.SendMessage(player.dmRoomID, fmt.Sprintf("*Auto-played:* %s (chose %s %s).", card.Display(), color.Emoji(), color))
@@ -1398,6 +1580,9 @@ func (p *UnoPlugin) autoPlayMultiTurn(game *unoMultiGame, player *unoMultiPlayer
game.turns++
if card.Value == unoWildCard || card.Value == unoWildDrawFour {
if card.Value == unoWildDrawFour {
game.wd4PrevColor = game.topColor
}
color := botPickColor(player.hand)
game.topColor = color
p.SendMessage(player.dmRoomID, fmt.Sprintf("*Auto-played:* Drew and played %s (chose %s %s).", card.Display(), color.Emoji(), color))
@@ -1425,8 +1610,12 @@ func (p *UnoPlugin) autoPlayMultiTurn(game *unoMultiGame, player *unoMultiPlayer
}
// applyAutoEffects applies card effects after an auto-play and advances the turn.
func (p *UnoPlugin) applyAutoEffects(game *unoMultiGame, _ *unoMultiPlayer, card unoCard) {
p.applyCardEffects(game, card)
func (p *UnoPlugin) applyAutoEffects(game *unoMultiGame, player *unoMultiPlayer, card unoCard) {
eff := p.applyCardEffects(game, card)
if eff.needsChallenge {
p.startWD4Challenge(game, player)
return
}
p.executeMultiTurn(game)
}