#!/usr/bin/env python3
"""
PolySimulator Example Trading Bot

Simple mean-reversion strategy:
1. Fetch hot markets
2. Find markets where Yes price is < 0.40 (undervalued)
3. Buy small positions
4. Monitor and sell when price rises above 0.60

Usage:
    export POLYSIM_API_KEY="ps_live_..."
    export POLYSIM_BASE_URL="https://api.polysimulator.com"
    python trading_bot.py
"""

import json
import os
import time
import uuid
import requests

API_KEY = os.environ["POLYSIM_API_KEY"]
BASE_URL = os.environ.get("POLYSIM_BASE_URL", "https://api.polysimulator.com")
HEADERS = {
    "X-API-Key": API_KEY,
    "Content-Type": "application/json",
}


def get_balance():
    """Get current account balance."""
    resp = requests.get(f"{BASE_URL}/v1/account/balance", headers=HEADERS)
    resp.raise_for_status()
    return resp.json()


def get_hot_markets(limit=20):
    """Fetch actively traded markets."""
    resp = requests.get(
        f"{BASE_URL}/v1/markets",
        headers=HEADERS,
        params={"hot_only": True, "limit": limit},
    )
    resp.raise_for_status()
    return resp.json()


# Terminal (non-resting) order states returned by GET /v1/orders/{id}.
# A PENDING order is still resting on the book; anything in this set is
# done. NOTE the endpoint matters — and the CANCELLED spelling differs:
#   * GET /v1/orders/{id}        → PENDING | FILLED | CANCELLED | REJECTED | EXPIRED  (native, double-L CANCELLED — this bot)
#   * GET /v1/data/order/{id}    → ORDER_STATUS_LIVE | _MATCHED | _CANCELED | _INVALID  (PM-CLOB shape, single-L CANCELED)
#   * POST /v1/order response    → live | matched | unmatched  (PM write-response shape)
TERMINAL_STATUSES = ("FILLED", "CANCELLED", "REJECTED", "EXPIRED")


def poll_order(order_id, timeout_s=30):
    """Poll GET /v1/orders/{id} until status is final.

    Used to recover from a 503 DEADLINE_OVERSHOT_BUT_PERSISTED — the
    order persisted but the server response timed out. Polling lets us
    learn the real outcome (a ``TERMINAL_STATUSES`` value, vs the
    still-resting ``PENDING``) without double-placing.

    Each request has a per-call ``timeout=5`` so a stalled TCP socket
    can't pin a poll iteration past the ``timeout_s`` deadline. On
    ``requests.exceptions.RequestException`` we sleep and retry instead
    of bailing — transient network failures shouldn't terminate the
    recovery loop.
    """
    deadline = time.time() + timeout_s
    while time.time() < deadline:
        try:
            r = requests.get(
                f"{BASE_URL}/v1/orders/{order_id}",
                headers=HEADERS,
                timeout=5,
            )
            if r.status_code == 200:
                body = r.json()
                status = body.get("status")
                if status in TERMINAL_STATUSES:
                    return body
        except requests.exceptions.RequestException:
            # Transient (connect/read timeout, DNS, conn-reset).
            # Keep polling — the order is already persisted server-side.
            pass
        time.sleep(1)
    return None  # caller decides whether to give up or keep polling


def place_order(
    market_id,
    side,
    outcome,
    quantity,
    price,
    order_type="market",
    idempotency_key=None,
):
    """Place a market or limit order.

    Note: ``price`` is REQUIRED even for market orders — it acts as a
    worst-price slippage cap (Polymarket-faithful semantics). For BUY,
    set the maximum you'll pay; for SELL, the minimum you'll accept.

    Handles the 503 DEADLINE_OVERSHOT_BUT_PERSISTED envelope correctly:
    when the server-side deadline fires after the order has already
    persisted, the response carries the order_id in the
    ``X-Polysim-Order-Id`` header. We DO NOT re-place; we poll the
    order endpoint to learn the final state. Critically, we re-use the
    SAME idempotency_key on retry — the server's idempotency layer
    deduplicates, but only when the key is stable across the retry
    sequence.
    """
    # The default idempotency key MUST be stable across retries of the
    # same logical order; otherwise the helper's retry-safety guarantee
    # is hollow (a fresh key on every retry defeats the server-side
    # dedup layer). Do NOT use ``uuid.uuid4()`` here — it's fresh-random
    # per call.
    #
    # The deterministic key is uuid5(NAMESPACE_OID, payload) where the
    # payload combines the order tuple AND a second-precision timestamp.
    # Second precision keeps retries within a 1-second window dedup'd
    # (typical 503-overshoot retry latency is <500ms) while letting
    # genuinely independent same-second orders be the caller's job to
    # disambiguate — for high-frequency strategies, pass an explicit
    # ``idempotency_key`` (e.g. ``f"{strategy}-{client_seq}"``).
    if idempotency_key is None:
        second_bucket = int(time.time())
        seed = f"{market_id}|{side}|{outcome}|{quantity}|{price}|{second_bucket}"
        idempotency_key = f"bot-{uuid.uuid5(uuid.NAMESPACE_OID, seed)}"

    payload = {
        "market_id": market_id,
        "side": side,
        "outcome": outcome,
        "quantity": str(quantity),  # Always use strings for numeric values
        "price": str(price),         # Worst-price slippage cap
        "order_type": order_type,
    }

    # Mirror ``poll_order``'s per-call ``timeout=5`` here. A stalled TCP
    # socket on the POST would otherwise hang past the retry/idempotency
    # boundary — and because the request is wrapped in idempotency-by-key,
    # ``requests.exceptions.RequestException`` is the SAFE recovery surface:
    # we don't know whether the order persisted server-side or not, but the
    # caller's next call with the SAME default key will dedup if it did.
    # Surface the exception so the caller can decide (retry with the same
    # ``idempotency_key`` is safe; ignore-and-continue would silently lose
    # an order). Do NOT swallow — unlike the poll loop, place_order is the
    # write path, not a recovery loop.
    try:
        resp = requests.post(
            f"{BASE_URL}/v1/orders",
            headers={
                **HEADERS,
                "Idempotency-Key": idempotency_key,
            },
            json=payload,
            timeout=5,
        )
    except requests.exceptions.RequestException as exc:
        # Surface a structured error so callers can retry with the SAME
        # ``idempotency_key`` (guaranteed-stable by the uuid5 seed above)
        # without double-placing. The server's idempotency layer will
        # deduplicate if the original request did land.
        raise RuntimeError(
            f"place_order network error (retry with same idempotency_key "
            f"{idempotency_key!r} is safe): {exc}"
        ) from exc

    # Handle 503 DEADLINE_OVERSHOT_BUT_PERSISTED without crashing.
    # The order DID land server-side; the X-Polysim-Order-Id header
    # carries the id so we can poll for the final status instead of
    # retrying (which would either double-fill or be deduplicated by
    # the idempotency layer — but only if the key is stable).
    if resp.status_code == 503:
        body = {}
        try:
            body = resp.json()
        except Exception:
            pass
        # Branch on the stable machine code in the X-Polysim-Code header.
        # The body is {"error": "<CODE>", "message": "<human text>"}, so
        # body["error"] carries the same code; never branch on "message".
        if resp.headers.get("X-Polysim-Code") == "DEADLINE_OVERSHOT_BUT_PERSISTED":
            order_id = resp.headers.get("X-Polysim-Order-Id") or body.get("order_id")
            if order_id is not None:
                print(f"  [503] Order {order_id} persisted but deadline overshot. Polling for final state...")
                final = poll_order(order_id)
                if final is not None:
                    return final
                # Polling timed out — surface the partial info so the
                # caller can decide whether to keep polling or give up.
                return {"order_id": order_id, "status": "PENDING", "deadline_overshoot": True}
        # Other 503 classes (SERVER_BUSY etc.) — let raise_for_status fire.

    resp.raise_for_status()
    return resp.json()


def get_positions():
    """Get all open positions."""
    resp = requests.get(
        f"{BASE_URL}/v1/account/positions",
        headers=HEADERS,
        params={"status": "OPEN"},
    )
    resp.raise_for_status()
    return resp.json()


def run_strategy():
    """Main trading loop."""
    print("=== PolySimulator Bot Starting ===")
    balance = get_balance()
    print(f"Balance: ${balance['balance']} | Unrealized PnL: {balance['unrealized_pnl']}")

    while True:
        try:
            # 1. Check balance
            balance = get_balance()
            cash = float(balance["balance"])
            print(f"\n--- Cycle at {time.strftime('%H:%M:%S')} | Cash: ${cash:.2f} ---")

            if cash < 1.0:
                print("Low balance — waiting for sells or settlements")
                time.sleep(30)
                continue

            # 2. Scan for undervalued markets
            markets = get_hot_markets(limit=30)
            opportunities = []
            for m in markets:
                if not m.get("live_price"):
                    continue
                yes_price = float(m["live_price"]["buy"])
                if 0.10 < yes_price < 0.40:
                    opportunities.append((m, yes_price))

            if opportunities:
                print(f"Found {len(opportunities)} undervalued markets")
                # Buy the cheapest one
                opportunities.sort(key=lambda x: x[1])
                market, price = opportunities[0]
                qty = min(5, int(cash / price))
                if qty > 0:
                    # Worst-price BUY cap: 5% above live ask, hard-clamped at 0.99
                    worst_buy = min(0.99, price * 1.05)
                    print(f"  BUY {qty}x Yes @ {price:.2f} (cap {worst_buy:.2f}) — {market['question'][:60]}")
                    result = place_order(
                        market["condition_id"], "BUY", "Yes", qty, worst_buy
                    )
                    print(f"  → Order {result['order_id']}: {result['status']} @ {result['price']}")

            # 3. Check existing positions for exit signals
            positions = get_positions()
            for pos in positions:
                current = float(pos["current_price"]) if pos.get("current_price") else None
                if current and current > 0.60:
                    qty = int(float(pos["quantity"]))
                    if qty > 0:
                        # Worst-price SELL floor: 5% below current, hard-floored at 0.01
                        worst_sell = max(0.01, current * 0.95)
                        print(f"  SELL {qty}x {pos['outcome']} @ {current:.2f} (floor {worst_sell:.2f})")
                        result = place_order(
                            pos["market_id"], "SELL", pos["outcome"], qty, worst_sell
                        )
                        print(f"  → Order {result['order_id']}: {result['status']} @ {result['price']}")

            time.sleep(10)  # Wait before next cycle

        except requests.exceptions.HTTPError as e:
            if e.response.status_code == 429:
                retry = int(e.response.headers.get("Retry-After", 5))
                print(f"Rate limited — waiting {retry}s")
                time.sleep(retry)
            else:
                print(f"HTTP Error: {e}")
                time.sleep(5)
        except Exception as e:
            print(f"Error: {e}")
            time.sleep(10)


if __name__ == "__main__":
    run_strategy()

# Set environment variables
export POLYSIM_API_KEY="ps_live_..."
export POLYSIM_BASE_URL="https://api.polysimulator.com"

# Install dependencies
pip install requests

# Run
python trading_bot.py