1use std::time::Duration;
2use std::time::Instant;
3
4use flatland_protocol::{Intent, LifeState, NpcView, ResourceNodeView, Seq, Snapshot};
5use rand::rngs::StdRng;
6use rand::Rng;
7use rand::SeedableRng;
8use tracing::debug;
9
10use crate::session::{PlayConnection, SessionEvent};
11
12#[derive(Debug, Clone)]
13pub struct BotConfig {
14 pub name: String,
15 pub think_interval: Duration,
16 pub harvest_once: bool,
17 pub hunt_once: bool,
18 pub say_once: Option<String>,
19}
20
21impl BotConfig {
22 pub fn new(name: impl Into<String>) -> Self {
23 Self {
24 name: name.into(),
25 think_interval: Duration::from_millis(100),
26 harvest_once: false,
27 hunt_once: false,
28 say_once: None,
29 }
30 }
31}
32
33#[derive(Debug, Default, Clone)]
34pub struct BotStats {
35 pub ticks_received: u64,
36 pub intents_sent: u64,
37 pub intent_acks: u64,
38 pub last_tick: u64,
39 pub last_entity_count: usize,
40 pub intent_latency_p99_ms: f64,
41}
42
43struct PendingIntent {
44 sent_at: Instant,
45 seq: Seq,
46}
47
48#[derive(Debug, Clone, Copy, PartialEq, Eq)]
49enum HuntPhase {
50 Seek,
51 Fight,
52 Butcher,
53 Done,
54}
55
56pub struct BotClient<S: PlayConnection> {
57 config: BotConfig,
58 session: S,
59 seq: Seq,
60 stats: BotStats,
61 pending: Vec<PendingIntent>,
62 rng: StdRng,
63 did_special: bool,
64 hunt_phase: Option<HuntPhase>,
65 last_pos: (f32, f32),
66 last_npcs: Vec<NpcView>,
67 last_resource_nodes: Vec<ResourceNodeView>,
68 hunt_target: Option<u64>,
69 attack_cooldown: u8,
70}
71
72impl<S: PlayConnection> BotClient<S> {
73 pub fn new(config: BotConfig, session: S) -> Self {
74 let seed = session.entity_id() ^ session.session_id().rotate_left(17);
75 let hunt_once = config.hunt_once;
76 Self {
77 config,
78 session,
79 seq: 0,
80 stats: BotStats::default(),
81 pending: Vec::new(),
82 rng: StdRng::seed_from_u64(seed),
83 did_special: false,
84 hunt_phase: if hunt_once {
85 Some(HuntPhase::Seek)
86 } else {
87 None
88 },
89 last_pos: (0.0, 0.0),
90 last_npcs: Vec::new(),
91 last_resource_nodes: Vec::new(),
92 hunt_target: None,
93 attack_cooldown: 0,
94 }
95 }
96
97 pub fn entity_id(&self) -> u64 {
98 self.session.entity_id()
99 }
100
101 pub fn stats(&self) -> &BotStats {
102 &self.stats
103 }
104
105 pub async fn run_until(&mut self, deadline: Instant) -> anyhow::Result<()> {
106 let mut next_think = tokio::time::Instant::now();
107
108 while Instant::now() < deadline {
109 tokio::select! {
110 _ = tokio::time::sleep_until(next_think) => {
111 self.send_random_intent().await?;
112 next_think = tokio::time::Instant::now() + self.config.think_interval;
113 }
114 event = self.session.next_event() => {
115 match event {
116 Some(ev) => self.handle_event(ev).await?,
117 None => break,
118 }
119 }
120 }
121 }
122
123 self.disconnect();
124 Ok(())
125 }
126
127 pub fn disconnect(&self) {
128 self.session.disconnect();
129 }
130
131 async fn send_random_intent(&mut self) -> anyhow::Result<()> {
132 if self.config.hunt_once {
133 if let Some(phase) = self.hunt_phase {
134 if phase != HuntPhase::Done {
135 return self.send_hunt_intent().await;
136 }
137 }
138 }
139
140 self.seq += 1;
141 let forward = self.rng.gen_range(-1.0..=1.0);
142 let strafe = self.rng.gen_range(-1.0..=1.0);
143 let seq = self.seq;
144
145 self.session
146 .submit_intent(Intent::Move {
147 entity_id: self.session.entity_id(),
148 forward,
149 strafe,
150 vertical: 0.0,
151 sprint: false,
152 seq,
153 })
154 .await?;
155
156 self.pending.push(PendingIntent {
157 sent_at: Instant::now(),
158 seq,
159 });
160 self.stats.intents_sent += 1;
161 Ok(())
162 }
163
164 async fn handle_event(&mut self, event: SessionEvent) -> anyhow::Result<()> {
165 match event {
166 SessionEvent::Welcome {
167 entity_id,
168 snapshot,
169 ..
170 } => {
171 debug!(bot = %self.config.name, entity_id, "welcome");
172 self.ingest_snapshot(&snapshot);
173 if !self.did_special {
174 self.did_special = true;
175 if self.config.harvest_once {
176 if let Some(node) = snapshot
177 .resource_nodes
178 .iter()
179 .find(|n| n.state == flatland_protocol::ResourceNodeState::Available)
180 {
181 self.seq += 1;
182 self.session
183 .submit_intent(Intent::Harvest {
184 entity_id: self.session.entity_id(),
185 node_id: node.id.clone(),
186 seq: self.seq,
187 })
188 .await?;
189 self.stats.intents_sent += 1;
190 }
191 }
192 if let Some(text) = &self.config.say_once {
193 self.seq += 1;
194 self.session
195 .submit_intent(Intent::Say {
196 entity_id: self.session.entity_id(),
197 channel: flatland_protocol::ChatChannel::Nearby,
198 text: text.clone(),
199 to_entity: None,
200 seq: self.seq,
201 })
202 .await?;
203 self.stats.intents_sent += 1;
204 }
205 }
206 }
207 SessionEvent::Tick(delta) => {
208 self.stats.ticks_received += 1;
209 self.stats.last_tick = delta.tick;
210 self.stats.last_entity_count = delta.entities.len();
211 if let Some(entity) = delta
212 .entities
213 .iter()
214 .find(|e| e.id == self.session.entity_id())
215 {
216 self.last_pos = (entity.transform.position.x, entity.transform.position.y);
217 }
218 if !delta.npcs.is_empty() {
219 self.last_npcs = delta.npcs;
220 }
221 if !delta.resource_nodes.is_empty() {
222 self.last_resource_nodes = delta.resource_nodes;
223 }
224 }
225 SessionEvent::IntentAck { seq, .. } => {
226 self.stats.intent_acks += 1;
227 if let Some(idx) = self.pending.iter().position(|p| p.seq == seq) {
228 let pending = self.pending.remove(idx);
229 let ms = pending.sent_at.elapsed().as_secs_f64() * 1000.0;
230 self.stats.intent_latency_p99_ms = self.stats.intent_latency_p99_ms.max(ms);
231 }
232 }
233 SessionEvent::Chat(_) | SessionEvent::HarvestResult(_) => {}
234 SessionEvent::CraftResult(_)
235 | SessionEvent::Death(_)
236 | SessionEvent::Interaction(_)
237 | SessionEvent::ShopOpened(_)
238 | SessionEvent::BankOpened(_)
239 | SessionEvent::StorageOpened(_)
240 | SessionEvent::TradeOpened(_)
241 | SessionEvent::TradeClosed { .. }
242 | SessionEvent::UseResult(_)
243 | SessionEvent::NpcTalkOpened(_)
244 | SessionEvent::NpcTalkPending(_)
245 | SessionEvent::NpcTalkReply(_)
246 | SessionEvent::NpcTalkClosed(_)
247 | SessionEvent::NpcTalkError(_)
248 | SessionEvent::QuestOffer(_)
249 | SessionEvent::QuestAccepted(_)
250 | SessionEvent::QuestWithdrawn(_)
251 | SessionEvent::QuestStepCompleted(_)
252 | SessionEvent::QuestCompleted(_)
253 | SessionEvent::ContentUpdated { .. } => {}
254 SessionEvent::Disconnected { .. } => {
255 anyhow::bail!("disconnected");
256 }
257 }
258 Ok(())
259 }
260
261 fn ingest_snapshot(&mut self, snapshot: &Snapshot) {
262 self.last_npcs = snapshot.npcs.clone();
263 self.last_resource_nodes = snapshot.resource_nodes.clone();
264 if let Some(entity) = snapshot
265 .entities
266 .iter()
267 .find(|e| e.id == self.session.entity_id())
268 {
269 self.last_pos = (entity.transform.position.x, entity.transform.position.y);
270 }
271 }
272
273 fn nearest_wildlife(&self) -> Option<&NpcView> {
274 let (px, py) = self.last_pos;
275 self.last_npcs
276 .iter()
277 .filter(|n| n.entity_id.is_some())
278 .filter(|n| n.building_id.is_none())
279 .filter(|n| n.life_state != Some(LifeState::Dead))
280 .min_by(|a, b| {
281 let da = (a.x - px).hypot(a.y - py);
282 let db = (b.x - px).hypot(b.y - py);
283 da.partial_cmp(&db).unwrap_or(std::cmp::Ordering::Equal)
284 })
285 }
286
287 fn nearest_carcass(&self) -> Option<&ResourceNodeView> {
288 let (px, py) = self.last_pos;
289 self.last_resource_nodes
290 .iter()
291 .filter(|n| n.id.starts_with("carcass-"))
292 .filter(|n| n.state == flatland_protocol::ResourceNodeState::Available)
293 .min_by(|a, b| {
294 let da = (a.x - px).hypot(a.y - py);
295 let db = (b.x - px).hypot(b.y - py);
296 da.partial_cmp(&db).unwrap_or(std::cmp::Ordering::Equal)
297 })
298 }
299
300 async fn send_hunt_intent(&mut self) -> anyhow::Result<()> {
301 let phase = self.hunt_phase.unwrap_or(HuntPhase::Done);
302 let entity_id = self.session.entity_id();
303 let (px, py) = self.last_pos;
304
305 if let Some(carcass) = self.nearest_carcass().cloned() {
306 let dist = (carcass.x - px).hypot(carcass.y - py);
307 if dist <= 2.0 {
308 self.hunt_phase = Some(HuntPhase::Butcher);
309 self.seq += 1;
310 self.session
311 .submit_intent(Intent::Harvest {
312 entity_id,
313 node_id: carcass.id,
314 seq: self.seq,
315 })
316 .await?;
317 self.stats.intents_sent += 1;
318 self.hunt_phase = Some(HuntPhase::Done);
319 return Ok(());
320 }
321 }
322
323 match phase {
324 HuntPhase::Seek | HuntPhase::Fight => {
325 if let Some(prey) = self.nearest_wildlife().cloned() {
326 let tx = prey.x;
327 let ty = prey.y;
328 let prey_entity = prey.entity_id;
329 let dist = (tx - px).hypot(ty - py);
330 if dist <= 2.0 {
331 self.hunt_phase = Some(HuntPhase::Fight);
332 if self.hunt_target != prey_entity {
333 self.hunt_target = prey_entity;
334 self.seq += 1;
335 if let Some(target_id) = prey_entity {
336 self.session
337 .submit_intent(Intent::SetTarget {
338 entity_id,
339 target_id,
340 seq: self.seq,
341 })
342 .await?;
343 self.stats.intents_sent += 1;
344 }
345 }
346 if self.attack_cooldown == 0 {
347 self.seq += 1;
348 self.session
349 .submit_intent(Intent::Attack {
350 entity_id,
351 target_id: prey_entity,
352 weapon_slot: None,
353 seq: self.seq,
354 })
355 .await?;
356 self.stats.intents_sent += 1;
357 self.attack_cooldown = 6;
358 } else {
359 self.attack_cooldown = self.attack_cooldown.saturating_sub(1);
360 }
361 return Ok(());
362 }
363
364 let dx = tx - px;
365 let dy = ty - py;
366 let len = (dx * dx + dy * dy).sqrt().max(0.001);
367 let forward = dy / len;
368 let strafe = dx / len;
369 self.seq += 1;
370 self.session
371 .submit_intent(Intent::Move {
372 entity_id,
373 forward,
374 strafe,
375 vertical: 0.0,
376 sprint: true,
377 seq: self.seq,
378 })
379 .await?;
380 self.stats.intents_sent += 1;
381 return Ok(());
382 }
383 }
384 HuntPhase::Butcher | HuntPhase::Done => {}
385 }
386
387 self.send_random_move().await
388 }
389
390 async fn send_random_move(&mut self) -> anyhow::Result<()> {
391 self.seq += 1;
392 let forward = self.rng.gen_range(-1.0..=1.0);
393 let strafe = self.rng.gen_range(-1.0..=1.0);
394 let seq = self.seq;
395
396 self.session
397 .submit_intent(Intent::Move {
398 entity_id: self.session.entity_id(),
399 forward,
400 strafe,
401 vertical: 0.0,
402 sprint: false,
403 seq,
404 })
405 .await?;
406
407 self.pending.push(PendingIntent {
408 sent_at: Instant::now(),
409 seq,
410 });
411 self.stats.intents_sent += 1;
412 Ok(())
413 }
414}