"""
trigger_proactive/app.py
─────────────────────────
Lightweight HF Space trigger.
Wakes quickly, then polls the main Socrates Docker until ready,
then calls /proactive/run.

Env vars required:
  SOCRATES_URL              – main Docker URL  (e.g. https://alesamodio.hf.space)
  PROACTIVE_TRIGGER_SECRET  – shared secret    (must match main Docker)
"""

import os
import time
import requests
from fastapi import FastAPI, Request, HTTPException

app = FastAPI()

SOCRATES_URL    = os.environ.get("SOCRATES_URL", "").rstrip("/")
TRIGGER_SECRET  = os.environ.get("PROACTIVE_TRIGGER_SECRET", "")

POLL_INTERVAL   = 15    # seconds between readiness checks
POLL_MAX        = 40    # max attempts → 40 × 15s = 10 minutes


@app.get("/")
def health():
    return {"status": "trigger_proactive alive"}


@app.get("/run")
def run(request: Request):
    # ── Auth ──────────────────────────────────────────────────────────────────
    if TRIGGER_SECRET:
        provided = request.headers.get("x-trigger-secret", "")
        if provided != TRIGGER_SECRET:
            raise HTTPException(status_code=403, detail="Invalid trigger secret")

    if not SOCRATES_URL:
        raise HTTPException(status_code=500, detail="SOCRATES_URL not configured")

    # ── Step 1: send wake-up ping ─────────────────────────────────────────────
    print(f"[trigger] Waking {SOCRATES_URL} ...")
    try:
        requests.get(SOCRATES_URL + "/ready", timeout=10)
    except Exception:
        pass   # expected to fail or time out while waking

    # ── Step 2: poll until ready ──────────────────────────────────────────────
    print("[trigger] Polling until main Docker is ready ...")
    ready = False
    for attempt in range(1, POLL_MAX + 1):
        try:
            r = requests.get(SOCRATES_URL + "/ready", timeout=10)
            if r.status_code in (200, 422):
                print(f"[trigger] Ready after {attempt} attempts ({attempt * POLL_INTERVAL}s)")
                ready = True
                break
        except Exception as e:
            print(f"[trigger] attempt {attempt}: {e}")
        time.sleep(POLL_INTERVAL)

    if not ready:
        raise HTTPException(status_code=504, detail="Main Docker did not wake in time")

    # ── Step 3: call /proactive/run ───────────────────────────────────────────
    print("[trigger] Calling /proactive/run ...")
    try:
        resp = requests.post(
            SOCRATES_URL + "/proactive/run",
            headers={
                "Content-Type":    "application/json",
                "x-trigger-secret": TRIGGER_SECRET,
            },
            json={},
            timeout=300,   # proactive pipeline can take a few minutes for many users
        )
        result = resp.json()
        print(f"[trigger] Done. sent={result.get('sent', '?')}")
        return result
    except Exception as e:
        raise HTTPException(status_code=502, detail=f"Proactive pipeline error: {e}")