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 seq: self.seq,
200 })
201 .await?;
202 self.stats.intents_sent += 1;
203 }
204 }
205 }
206 SessionEvent::Tick(delta) => {
207 self.stats.ticks_received += 1;
208 self.stats.last_tick = delta.tick;
209 self.stats.last_entity_count = delta.entities.len();
210 if let Some(entity) = delta
211 .entities
212 .iter()
213 .find(|e| e.id == self.session.entity_id())
214 {
215 self.last_pos = (entity.transform.position.x, entity.transform.position.y);
216 }
217 if !delta.npcs.is_empty() {
218 self.last_npcs = delta.npcs;
219 }
220 if !delta.resource_nodes.is_empty() {
221 self.last_resource_nodes = delta.resource_nodes;
222 }
223 }
224 SessionEvent::IntentAck { seq, .. } => {
225 self.stats.intent_acks += 1;
226 if let Some(idx) = self.pending.iter().position(|p| p.seq == seq) {
227 let pending = self.pending.remove(idx);
228 let ms = pending.sent_at.elapsed().as_secs_f64() * 1000.0;
229 self.stats.intent_latency_p99_ms = 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::BankOpened(_)
238 | SessionEvent::StorageOpened(_)
239 | SessionEvent::UseResult(_)
240 | SessionEvent::NpcTalkOpened(_)
241 | SessionEvent::NpcTalkPending(_)
242 | SessionEvent::NpcTalkReply(_)
243 | SessionEvent::NpcTalkClosed(_)
244 | SessionEvent::NpcTalkError(_)
245 | SessionEvent::QuestOffer(_)
246 | SessionEvent::QuestAccepted(_)
247 | SessionEvent::QuestWithdrawn(_)
248 | SessionEvent::QuestStepCompleted(_)
249 | SessionEvent::QuestCompleted(_)
250 | SessionEvent::ContentUpdated { .. } => {}
251 SessionEvent::Disconnected { .. } => {
252 anyhow::bail!("disconnected");
253 }
254 }
255 Ok(())
256 }
257
258 fn ingest_snapshot(&mut self, snapshot: &Snapshot) {
259 self.last_npcs = snapshot.npcs.clone();
260 self.last_resource_nodes = snapshot.resource_nodes.clone();
261 if let Some(entity) = snapshot
262 .entities
263 .iter()
264 .find(|e| e.id == self.session.entity_id())
265 {
266 self.last_pos = (entity.transform.position.x, entity.transform.position.y);
267 }
268 }
269
270 fn nearest_wildlife(&self) -> Option<&NpcView> {
271 let (px, py) = self.last_pos;
272 self.last_npcs
273 .iter()
274 .filter(|n| n.entity_id.is_some())
275 .filter(|n| n.building_id.is_none())
276 .filter(|n| n.life_state != Some(LifeState::Dead))
277 .min_by(|a, b| {
278 let da = (a.x - px).hypot(a.y - py);
279 let db = (b.x - px).hypot(b.y - py);
280 da.partial_cmp(&db).unwrap_or(std::cmp::Ordering::Equal)
281 })
282 }
283
284 fn nearest_carcass(&self) -> Option<&ResourceNodeView> {
285 let (px, py) = self.last_pos;
286 self.last_resource_nodes
287 .iter()
288 .filter(|n| n.id.starts_with("carcass-"))
289 .filter(|n| n.state == flatland_protocol::ResourceNodeState::Available)
290 .min_by(|a, b| {
291 let da = (a.x - px).hypot(a.y - py);
292 let db = (b.x - px).hypot(b.y - py);
293 da.partial_cmp(&db).unwrap_or(std::cmp::Ordering::Equal)
294 })
295 }
296
297 async fn send_hunt_intent(&mut self) -> anyhow::Result<()> {
298 let phase = self.hunt_phase.unwrap_or(HuntPhase::Done);
299 let entity_id = self.session.entity_id();
300 let (px, py) = self.last_pos;
301
302 if let Some(carcass) = self.nearest_carcass().cloned() {
303 let dist = (carcass.x - px).hypot(carcass.y - py);
304 if dist <= 2.0 {
305 self.hunt_phase = Some(HuntPhase::Butcher);
306 self.seq += 1;
307 self.session
308 .submit_intent(Intent::Harvest {
309 entity_id,
310 node_id: carcass.id,
311 seq: self.seq,
312 })
313 .await?;
314 self.stats.intents_sent += 1;
315 self.hunt_phase = Some(HuntPhase::Done);
316 return Ok(());
317 }
318 }
319
320 match phase {
321 HuntPhase::Seek | HuntPhase::Fight => {
322 if let Some(prey) = self.nearest_wildlife().cloned() {
323 let tx = prey.x;
324 let ty = prey.y;
325 let prey_entity = prey.entity_id;
326 let dist = (tx - px).hypot(ty - py);
327 if dist <= 2.0 {
328 self.hunt_phase = Some(HuntPhase::Fight);
329 if self.hunt_target != prey_entity {
330 self.hunt_target = prey_entity;
331 self.seq += 1;
332 if let Some(target_id) = prey_entity {
333 self.session
334 .submit_intent(Intent::SetTarget {
335 entity_id,
336 target_id,
337 seq: self.seq,
338 })
339 .await?;
340 self.stats.intents_sent += 1;
341 }
342 }
343 if self.attack_cooldown == 0 {
344 self.seq += 1;
345 self.session
346 .submit_intent(Intent::Attack {
347 entity_id,
348 target_id: prey_entity,
349 weapon_slot: None,
350 seq: self.seq,
351 })
352 .await?;
353 self.stats.intents_sent += 1;
354 self.attack_cooldown = 6;
355 } else {
356 self.attack_cooldown = self.attack_cooldown.saturating_sub(1);
357 }
358 return Ok(());
359 }
360
361 let dx = tx - px;
362 let dy = ty - py;
363 let len = (dx * dx + dy * dy).sqrt().max(0.001);
364 let forward = dy / len;
365 let strafe = dx / len;
366 self.seq += 1;
367 self.session
368 .submit_intent(Intent::Move {
369 entity_id,
370 forward,
371 strafe,
372 vertical: 0.0,
373 sprint: true,
374 seq: self.seq,
375 })
376 .await?;
377 self.stats.intents_sent += 1;
378 return Ok(());
379 }
380 }
381 HuntPhase::Butcher | HuntPhase::Done => {}
382 }
383
384 self.send_random_move().await
385 }
386
387 async fn send_random_move(&mut self) -> anyhow::Result<()> {
388 self.seq += 1;
389 let forward = self.rng.gen_range(-1.0..=1.0);
390 let strafe = self.rng.gen_range(-1.0..=1.0);
391 let seq = self.seq;
392
393 self.session
394 .submit_intent(Intent::Move {
395 entity_id: self.session.entity_id(),
396 forward,
397 strafe,
398 vertical: 0.0,
399 sprint: false,
400 seq,
401 })
402 .await?;
403
404 self.pending.push(PendingIntent {
405 sent_at: Instant::now(),
406 seq,
407 });
408 self.stats.intents_sent += 1;
409 Ok(())
410 }
411}