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# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
import random
from typing import Dict, List, Optional
from uuid import uuid4
from openenv.core.env_server.interfaces import Environment
from openenv.core.env_server.types import State
try:
from ..models import BRIDGE_TYPES, MATERIALS, BridgeForgeAction, BridgeForgeObservation
except (ImportError, ValueError):
from models import BRIDGE_TYPES, MATERIALS, BridgeForgeAction, BridgeForgeObservation
try:
from .scenarios import SCENARIOS, get_scenario, get_visible_constraints
from .simulation import run_simulation
from .reward import compute_reward
except (ImportError, ValueError):
from server.scenarios import SCENARIOS, get_scenario, get_visible_constraints
from server.simulation import run_simulation
from server.reward import compute_reward
class BridgeForgeEnvironment(Environment):
SUPPORTS_CONCURRENT_SESSIONS: bool = True
def __init__(self):
self._state = State(episode_id=str(uuid4()), step_count=0)
self._bridge_type: Optional[str] = None
self._nodes: List[Dict] = []
self._members: List[Dict] = []
self._supports: List[Dict] = []
self._loads: List[Dict] = []
self._simulation_result: Optional[Dict] = None
self._scenario: Optional[Dict] = None
self._done = False
def reset(self, seed: Optional[int] = None, **kwargs) -> BridgeForgeObservation:
if seed is not None:
random.seed(seed)
scenario_id = kwargs.get("scenario_id")
if scenario_id:
self._scenario = get_scenario(scenario_id)
else:
self._scenario = random.choice(SCENARIOS)
self._state = State(episode_id=str(uuid4()), step_count=0)
self._bridge_type = None
self._nodes = []
self._members = []
self._supports = []
self._loads = []
self._simulation_result = None
self._done = False
return self._make_observation(message="Environment reset. Choose a bridge type to begin.")
def step(self, action: BridgeForgeAction, **kwargs) -> BridgeForgeObservation:
if self._done:
return self._make_observation(message="Episode is done. Call reset() to start a new episode.")
if self._scenario is None:
return self._make_observation(message="No scenario loaded. Call reset() first.")
self._state.step_count += 1
action_type = action.action_type
params = action.params
handler = {
"select_type": self._handle_select_type,
"add_node": self._handle_add_node,
"add_member": self._handle_add_member,
"add_support": self._handle_add_support,
"add_load": self._handle_add_load,
"simulate": self._handle_simulate,
"submit": self._handle_submit,
}.get(action_type)
if handler is None:
return self._make_observation(
message=f"Unknown action_type: {action_type}. "
f"Valid types: select_type, add_node, add_member, add_support, add_load, simulate, submit"
)
return handler(params)
def _handle_select_type(self, params: Dict) -> BridgeForgeObservation:
bridge_type = params.get("bridge_type", "")
if bridge_type not in BRIDGE_TYPES:
return self._make_observation(
message=f"Invalid bridge type '{bridge_type}'. Choose from: {BRIDGE_TYPES}"
)
self._bridge_type = bridge_type
return self._make_observation(message=f"Bridge type set to '{bridge_type}'.")
def _handle_add_node(self, params: Dict) -> BridgeForgeObservation:
node_id = params.get("node_id")
x = params.get("x")
y = params.get("y")
if node_id is None or x is None or y is None:
return self._make_observation(message="add_node requires: node_id, x, y")
for n in self._nodes:
if n["node_id"] == node_id:
return self._make_observation(message=f"Node '{node_id}' already exists.")
self._nodes.append({"node_id": str(node_id), "x": float(x), "y": float(y)})
return self._make_observation(message=f"Node '{node_id}' added at ({x}, {y}).")
def _handle_add_member(self, params: Dict) -> BridgeForgeObservation:
member_id = params.get("member_id")
node_start = params.get("node_start")
node_end = params.get("node_end")
material = params.get("material", "steel")
section_area = params.get("section_area", 0.01)
if member_id is None or node_start is None or node_end is None:
return self._make_observation(message="add_member requires: member_id, node_start, node_end")
if material not in MATERIALS:
return self._make_observation(
message=f"Invalid material '{material}'. Choose from: {list(MATERIALS.keys())}"
)
node_ids = {n["node_id"] for n in self._nodes}
if str(node_start) not in node_ids:
return self._make_observation(message=f"Node '{node_start}' not found.")
if str(node_end) not in node_ids:
return self._make_observation(message=f"Node '{node_end}' not found.")
for m in self._members:
if m["member_id"] == member_id:
return self._make_observation(message=f"Member '{member_id}' already exists.")
self._members.append({
"member_id": str(member_id),
"node_start": str(node_start),
"node_end": str(node_end),
"material": material,
"section_area": float(section_area),
})
return self._make_observation(
message=f"Member '{member_id}' added: {node_start} -> {node_end} ({material}, A={section_area})."
)
def _handle_add_support(self, params: Dict) -> BridgeForgeObservation:
node_id = params.get("node_id")
support_type = params.get("support_type")
if node_id is None or support_type is None:
return self._make_observation(message="add_support requires: node_id, support_type (pin|roller)")
if support_type not in ("pin", "roller"):
return self._make_observation(message="support_type must be 'pin' or 'roller'.")
node_ids = {n["node_id"] for n in self._nodes}
if str(node_id) not in node_ids:
return self._make_observation(message=f"Node '{node_id}' not found.")
for s in self._supports:
if s["node_id"] == str(node_id):
return self._make_observation(message=f"Support already exists at node '{node_id}'.")
self._supports.append({"node_id": str(node_id), "support_type": support_type})
return self._make_observation(message=f"Support ({support_type}) added at node '{node_id}'.")
def _handle_add_load(self, params: Dict) -> BridgeForgeObservation:
node_id = params.get("node_id")
Fx = params.get("Fx", 0.0)
Fy = params.get("Fy", 0.0)
if node_id is None:
return self._make_observation(message="add_load requires: node_id")
node_ids = {n["node_id"] for n in self._nodes}
if str(node_id) not in node_ids:
return self._make_observation(message=f"Node '{node_id}' not found.")
self._loads.append({"node_id": str(node_id), "Fx": float(Fx), "Fy": float(Fy)})
return self._make_observation(
message=f"Load applied at node '{node_id}': Fx={Fx} kN, Fy={Fy} kN."
)
def _handle_simulate(self, params: Dict) -> BridgeForgeObservation:
if not self._nodes or not self._members:
return self._make_observation(message="Cannot simulate: add nodes and members first.")
if not self._supports:
return self._make_observation(message="Cannot simulate: add at least one support.")
if not self._loads:
return self._make_observation(message="Cannot simulate: add at least one load.")
result = run_simulation(
nodes=self._nodes,
members=self._members,
supports=self._supports,
loads=self._loads,
constraints=self._scenario["constraints"],
)
self._simulation_result = result
reward = compute_reward(
bridge_type=self._bridge_type or "",
nodes=self._nodes,
simulation_result=result,
constraints=self._scenario["constraints"],
is_submit=False,
)
return self._make_observation(
message="Simulation complete.",
reward=reward,
)
def _handle_submit(self, params: Dict) -> BridgeForgeObservation:
if self._simulation_result is None:
return self._make_observation(message="Run simulate() before submitting.")
reward = compute_reward(
bridge_type=self._bridge_type or "",
nodes=self._nodes,
simulation_result=self._simulation_result,
constraints=self._scenario["constraints"],
is_submit=True,
)
self._done = True
return self._make_observation(
message=f"Design submitted. Final reward: {reward}",
reward=reward,
done=True,
)
def _make_observation(
self,
message: str = "",
reward: float = 0.0,
done: bool = False,
) -> BridgeForgeObservation:
visible_constraints = {}
if self._scenario:
visible_constraints = get_visible_constraints(self._scenario["constraints"])
return BridgeForgeObservation(
scenario=self._scenario["scenario"] if self._scenario else "",
bridge_type=self._bridge_type,
nodes=list(self._nodes),
members=list(self._members),
supports=list(self._supports),
loads=list(self._loads),
simulation_result=self._simulation_result,
constraints=visible_constraints,
step_count=self._state.step_count,
done=done,
reward=reward,
message=message,
)
@property
def state(self) -> State:
return self._state
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