#!/bin/bash
# StreamCore - Start the backend.
#
# The backend owns everything: it serves the built frontend, starts the media
# origin at boot, supervises ffmpeg, and restarts either if it dies. This script
# only has to bring up the process that owns all of that. Node is a build-time
# dependency only (see the frontend build below), never a runtime one.
set -e

BASE="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"

export LS_HLS_RUNTIME_DIR="${LS_HLS_RUNTIME_DIR:-$BASE/runtime/hls}"
export LS_REPLAY_MEDIA_DIR="${LS_REPLAY_MEDIA_DIR:-$BASE/runtime/replay}"
mkdir -p "$LS_HLS_RUNTIME_DIR" "$LS_REPLAY_MEDIA_DIR" "$BASE/runtime/logs"

HOST="${LS_HOST:-0.0.0.0}"
PORT="${LS_PORT:-8080}"

# Build the frontend once, so a fresh checkout does not come up as a 503.
if [ ! -f "$BASE/frontend/dist/index.html" ]; then
  if command -v npm >/dev/null 2>&1; then
    echo "[StreamCore] Building frontend..."
    cd "$BASE/frontend"
    [ -d node_modules ] || npm install
    npm run build
  else
    echo "[StreamCore] WARNING: npm not found and frontend/dist is missing; the site will return 503." >&2
    echo "[StreamCore] WARNING: install Node.js and run: cd frontend && npm install && npm run build" >&2
  fi
fi

cd "$BASE/backend"
PY="$BASE/backend/venv/bin/python"
[ -x "$PY" ] || PY="$BASE/backend/.venv/bin/python"
[ -x "$PY" ] || PY="python"

echo "[StreamCore] Starting backend on ${HOST}:${PORT}..."
echo "[StreamCore] Frontend, MediaMTX, transcoders and HLS are served by the backend."
exec "$PY" -m uvicorn main:app --host "$HOST" --port "$PORT"