server/app.py

from fastapi import FastAPI
from pydantic import BaseModel
import random

random.seed(42)

app = FastAPI()

emails = [
    {"email": "Refund my order", "label": "support"},
    {"email": "Interested in pricing", "label": "sales"},
    {"email": "Bug in product", "label": "support"},
    {"email": "Partnership request", "label": "business"}
]

state = {}
done = False

class Action(BaseModel):
    action: str


@app.get("/")
def root():
    return {"status": "ok"}


# ---- TASK 1 ----
@app.post("/reset_easy")
def reset_easy():
    global state, done
    state = random.choice(emails)
    state["task"] = "easy"
    done = False
    return {"state": state}


# ---- TASK 2 ----
@app.post("/reset_medium")
def reset_medium():
    global state, done
    state = random.choice(emails)
    state["task"] = "medium"
    done = False
    return {"state": state}


# ---- TASK 3 ----
@app.post("/reset_hard")
def reset_hard():
    global state, done
    state = random.choice(emails)
    state["task"] = "hard"
    done = False
    return {"state": state}


# ---- TASK 4 ----
@app.post("/reset_expert")
def reset_expert():
    global state, done
    state = random.choice(emails)
    state["task"] = "expert"
    done = False
    return {"state": state}


# default reset
@app.post("/reset")
def reset():
    return reset_easy()


@app.post("/step")
def step(action: Action):
    global state, done

    correct = action.action == state["label"]

    # base reward
    base = 0.55 if correct else 0.25

    # difficulty bonus
    bonus = {
        "easy": 0.05,
        "medium": 0.1,
        "hard": 0.15,
        "expert": 0.2
    }

    reward = base + bonus.get(state["task"], 0)

    # add slight stochastic realism
    import random
    reward += random.uniform(-0.02, 0.02)

    # clamp
    reward = max(0.05, min(reward, 0.95))

    done = True

    return {
        "state": state,
        "reward": reward,
        "done": done
    }
def main():
    import uvicorn
    uvicorn.run("server.app:app", host="0.0.0.0", port=7860)


if __name__ == "__main__":
    main()