1use std::time::Duration;
2use std::time::Instant;
3
4use flatland_protocol::{Intent, LifeState, NpcView, ResourceNodeView, Seq, Snapshot};
5use rand::Rng;
6use rand::SeedableRng;
7use rand::rngs::StdRng;
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 { entity_id, snapshot, .. } => {
167 debug!(bot = %self.config.name, entity_id, "welcome");
168 self.ingest_snapshot(&snapshot);
169 if !self.did_special {
170 self.did_special = true;
171 if self.config.harvest_once {
172 if let Some(node) = snapshot
173 .resource_nodes
174 .iter()
175 .find(|n| n.state == flatland_protocol::ResourceNodeState::Available)
176 {
177 self.seq += 1;
178 self.session
179 .submit_intent(Intent::Harvest {
180 entity_id: self.session.entity_id(),
181 node_id: node.id.clone(),
182 seq: self.seq,
183 })
184 .await?;
185 self.stats.intents_sent += 1;
186 }
187 }
188 if let Some(text) = &self.config.say_once {
189 self.seq += 1;
190 self.session
191 .submit_intent(Intent::Say {
192 entity_id: self.session.entity_id(),
193 channel: flatland_protocol::ChatChannel::Nearby,
194 text: text.clone(),
195 seq: self.seq,
196 })
197 .await?;
198 self.stats.intents_sent += 1;
199 }
200 }
201 }
202 SessionEvent::Tick(delta) => {
203 self.stats.ticks_received += 1;
204 self.stats.last_tick = delta.tick;
205 self.stats.last_entity_count = delta.entities.len();
206 if let Some(entity) = delta
207 .entities
208 .iter()
209 .find(|e| e.id == self.session.entity_id())
210 {
211 self.last_pos = (
212 entity.transform.position.x,
213 entity.transform.position.y,
214 );
215 }
216 if !delta.npcs.is_empty() {
217 self.last_npcs = delta.npcs;
218 }
219 if !delta.resource_nodes.is_empty() {
220 self.last_resource_nodes = delta.resource_nodes;
221 }
222 }
223 SessionEvent::IntentAck { seq, .. } => {
224 self.stats.intent_acks += 1;
225 if let Some(idx) = self.pending.iter().position(|p| p.seq == seq) {
226 let pending = self.pending.remove(idx);
227 let ms = pending.sent_at.elapsed().as_secs_f64() * 1000.0;
228 self.stats.intent_latency_p99_ms =
229 self.stats.intent_latency_p99_ms.max(ms);
230 }
231 }
232 SessionEvent::Chat(_) | SessionEvent::HarvestResult(_) => {}
233 SessionEvent::CraftResult(_)
234 | SessionEvent::Death(_)
235 | SessionEvent::Interaction(_)
236 | SessionEvent::ShopOpened(_)
237 | SessionEvent::UseResult(_)
238 | SessionEvent::ContentUpdated { .. } => {}
239 SessionEvent::Disconnected { .. } => {
240 anyhow::bail!("disconnected");
241 }
242 }
243 Ok(())
244 }
245
246 fn ingest_snapshot(&mut self, snapshot: &Snapshot) {
247 self.last_npcs = snapshot.npcs.clone();
248 self.last_resource_nodes = snapshot.resource_nodes.clone();
249 if let Some(entity) = snapshot
250 .entities
251 .iter()
252 .find(|e| e.id == self.session.entity_id())
253 {
254 self.last_pos = (
255 entity.transform.position.x,
256 entity.transform.position.y,
257 );
258 }
259 }
260
261 fn nearest_wildlife(&self) -> Option<&NpcView> {
262 let (px, py) = self.last_pos;
263 self.last_npcs
264 .iter()
265 .filter(|n| n.entity_id.is_some())
266 .filter(|n| n.building_id.is_none())
267 .filter(|n| n.life_state != Some(LifeState::Dead))
268 .min_by(|a, b| {
269 let da = (a.x - px).hypot(a.y - py);
270 let db = (b.x - px).hypot(b.y - py);
271 da.partial_cmp(&db).unwrap_or(std::cmp::Ordering::Equal)
272 })
273 }
274
275 fn nearest_carcass(&self) -> Option<&ResourceNodeView> {
276 let (px, py) = self.last_pos;
277 self.last_resource_nodes
278 .iter()
279 .filter(|n| n.id.starts_with("carcass-"))
280 .filter(|n| n.state == flatland_protocol::ResourceNodeState::Available)
281 .min_by(|a, b| {
282 let da = (a.x - px).hypot(a.y - py);
283 let db = (b.x - px).hypot(b.y - py);
284 da.partial_cmp(&db).unwrap_or(std::cmp::Ordering::Equal)
285 })
286 }
287
288 async fn send_hunt_intent(&mut self) -> anyhow::Result<()> {
289 let phase = self.hunt_phase.unwrap_or(HuntPhase::Done);
290 let entity_id = self.session.entity_id();
291 let (px, py) = self.last_pos;
292
293 if let Some(carcass) = self.nearest_carcass().cloned() {
294 let dist = (carcass.x - px).hypot(carcass.y - py);
295 if dist <= 2.0 {
296 self.hunt_phase = Some(HuntPhase::Butcher);
297 self.seq += 1;
298 self.session
299 .submit_intent(Intent::Harvest {
300 entity_id,
301 node_id: carcass.id,
302 seq: self.seq,
303 })
304 .await?;
305 self.stats.intents_sent += 1;
306 self.hunt_phase = Some(HuntPhase::Done);
307 return Ok(());
308 }
309 }
310
311 match phase {
312 HuntPhase::Seek | HuntPhase::Fight => {
313 if let Some(prey) = self.nearest_wildlife().cloned() {
314 let tx = prey.x;
315 let ty = prey.y;
316 let prey_entity = prey.entity_id;
317 let dist = (tx - px).hypot(ty - py);
318 if dist <= 2.0 {
319 self.hunt_phase = Some(HuntPhase::Fight);
320 if self.hunt_target != prey_entity {
321 self.hunt_target = prey_entity;
322 self.seq += 1;
323 if let Some(target_id) = prey_entity {
324 self.session
325 .submit_intent(Intent::SetTarget {
326 entity_id,
327 target_id,
328 seq: self.seq,
329 })
330 .await?;
331 self.stats.intents_sent += 1;
332 }
333 }
334 if self.attack_cooldown == 0 {
335 self.seq += 1;
336 self.session
337 .submit_intent(Intent::Attack {
338 entity_id,
339 target_id: prey_entity,
340 weapon_slot: None,
341 seq: self.seq,
342 })
343 .await?;
344 self.stats.intents_sent += 1;
345 self.attack_cooldown = 6;
346 } else {
347 self.attack_cooldown = self.attack_cooldown.saturating_sub(1);
348 }
349 return Ok(());
350 }
351
352 let dx = tx - px;
353 let dy = ty - py;
354 let len = (dx * dx + dy * dy).sqrt().max(0.001);
355 let forward = dy / len;
356 let strafe = dx / len;
357 self.seq += 1;
358 self.session
359 .submit_intent(Intent::Move {
360 entity_id,
361 forward,
362 strafe,
363 vertical: 0.0,
364 sprint: true,
365 seq: self.seq,
366 })
367 .await?;
368 self.stats.intents_sent += 1;
369 return Ok(());
370 }
371 }
372 HuntPhase::Butcher | HuntPhase::Done => {}
373 }
374
375 self.send_random_move().await
376 }
377
378 async fn send_random_move(&mut self) -> anyhow::Result<()> {
379 self.seq += 1;
380 let forward = self.rng.gen_range(-1.0..=1.0);
381 let strafe = self.rng.gen_range(-1.0..=1.0);
382 let seq = self.seq;
383
384 self.session
385 .submit_intent(Intent::Move {
386 entity_id: self.session.entity_id(),
387 forward,
388 strafe,
389 vertical: 0.0,
390 sprint: false,
391 seq,
392 })
393 .await?;
394
395 self.pending.push(PendingIntent {
396 sent_at: Instant::now(),
397 seq,
398 });
399 self.stats.intents_sent += 1;
400 Ok(())
401 }
402}