#!/bin/bash
# Sanad_lite uvicorn launcher. Idempotent — exits cleanly if uvicorn is
# already SERVING on :8000. Designed to be called every 2 min by cron.
#
# This is the copy that actually runs in production, kept here so the repo
# is not missing the piece that keeps the site up. It lives on the host at
#     /home2/sanadliteysloota/sanadlite/start.sh
# and is invoked by:
#     */2 * * * * /home2/sanadliteysloota/sanadlite/start.sh
# The absolute paths below are that account's; change them for another host.

# --- 1. Health check: is the app actually SERVING HTTP on :8000? ----------
# A plain TCP-connect probe is not enough on its own: a wedged uvicorn (frozen
# asyncio loop) still holds the port and completes the TCP handshake, so a
# connect-only check reports "up" and never restarts a hung app (this bit us —
# the site was down ~2 days on a bound-but-frozen process). So: first cheaply
# check whether anything is bound (bash /dev/tcp), and if so require a real
# HTTP response too. curl prints "000" on timeout (hung); any real status code
# (200/303/401/...) means the event loop is alive and serving.
if (exec 3<>/dev/tcp/127.0.0.1/8000) 2>/dev/null; then
    exec 3<&-; exec 3>&-
    CODE="$(curl -s -o /dev/null -m 8 -w '%{http_code}' http://127.0.0.1:8000/api/health 2>/dev/null)"
    if [ -n "$CODE" ] && [ "$CODE" != "000" ]; then
        exit 0   # bound AND serving → healthy, nothing to do
    fi
    # Bound but not responding → wedged. Kill the frozen instance so we can
    # relaunch cleanly. Pattern is anchored to the venv path so it only ever
    # matches our own uvicorn, never this script or the selector helper.
    echo "[start.sh] $(date) — :8000 bound but not serving (code=${CODE:-none}); killing frozen instance" >> /home2/sanadliteysloota/sanadlite/logs/uvicorn.log
    pkill -9 -f '/home2/sanadliteysloota/virtualenv/sanadlite/.*main.py' 2>/dev/null
    sleep 2
fi

cd /home2/sanadliteysloota/sanadlite

# --- 2. Activate the venv (puts python3 on PATH, sets VIRTUAL_ENV) --------
source /home2/sanadliteysloota/virtualenv/sanadlite/3.8/bin/activate

# --- 3. Source env vars set in cPanel "Setup Python App" form -------------
# CloudLinux's Python Selector stores them in ~/.cl.selector/python-selector.json
# but the activate script does NOT re-export them. Parse + export here.
SELECTOR_JSON="$HOME/.cl.selector/python-selector.json"
APP_NAME="sanadlite"
if [ -f "$SELECTOR_JSON" ]; then
    eval "$(python - <<PYEOF
import json, shlex
try:
    data = json.load(open("$SELECTOR_JSON"))
except Exception:
    pass
else:
    app = data.get("$APP_NAME") or {}
    for k, v in (app.get("env_vars") or {}).items():
        print(f"export {shlex.quote(str(k))}={shlex.quote(str(v))}")
PYEOF
)"
fi

# --- 4. Standard runtime env ---------------------------------------------
export SANAD_DASHBOARD_HOST=127.0.0.1

# --- 5. Launch uvicorn in the background ---------------------------------
echo "[start.sh] $(date) — launching uvicorn on :8000" >> /home2/sanadliteysloota/sanadlite/logs/uvicorn.log
nohup python main.py >> /home2/sanadliteysloota/sanadlite/logs/uvicorn.log 2>&1 &
disown