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