#!/usr/bin/env bash
set -euo pipefail

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/env.sh"

PID_FILE="${PID_DIR}/backend.pid"
LOG_FILE="${LOG_DIR}/backend.log"
BACKEND_VENDOR_DIR="${BACKEND_VENDOR_DIR:-${BACKEND_DIR}/.deer-flow/python-vendor}"
BACKEND_WHEELHOUSE="${BACKEND_WHEELHOUSE:-${BACKEND_DIR}/wheelhouse}"
BACKEND_INSTALL_DEPS="${BACKEND_INSTALL_DEPS:-1}"
BACKEND_PIP_PACKAGES="${BACKEND_PIP_PACKAGES:-croniter==6.2.2 langgraph-checkpoint-postgres==3.0.5 psycopg==3.3.3 psycopg-binary==3.3.3 psycopg-pool==3.3.0 orjson==3.11.9 tzdata==2026.2}"

if is_running "${PID_FILE}"; then
  echo "Backend is already running (pid $(cat "${PID_FILE}"))."
  echo "URL: http://${HOST_IP}:${BACKEND_PORT}"
  exit 0
fi

rm -f "${PID_FILE}"

echo "Starting backend..."
echo "Log: ${LOG_FILE}"

mkdir -p "${BACKEND_VENDOR_DIR}"

if [[ "${BACKEND_INSTALL_DEPS}" != "0" ]]; then
  if ! (
    cd "${BACKEND_DIR}" && \
    PYTHONPATH=".:${BACKEND_VENDOR_DIR}${PYTHONPATH:+:${PYTHONPATH}}" \
      uv run --no-sync python -c "import croniter; import psycopg; import psycopg_pool; import langgraph.checkpoint.postgres; import langgraph.store.postgres"
  ) >/dev/null 2>&1; then
    if [[ ! -d "${BACKEND_WHEELHOUSE}" ]]; then
      echo "ERROR: wheelhouse not found: ${BACKEND_WHEELHOUSE}" >&2
      exit 1
    fi
    echo "Installing backend runtime deps into ${BACKEND_VENDOR_DIR}"
    (
      cd "${BACKEND_DIR}" && \
      uv pip install \
        --target "${BACKEND_VENDOR_DIR}" \
        --no-deps \
        --no-index \
        --find-links "${BACKEND_WHEELHOUSE}" \
        ${BACKEND_PIP_PACKAGES}
    )
  fi
fi

# nohup instead of setsid: setsid does not exist on Windows Git Bash.
nohup bash -c '
  cd "$0" || exit 1
  exec env \
    GATEWAY_CORS_ORIGINS="$1" \
    PYTHONPATH=".:$4${PYTHONPATH:+:${PYTHONPATH}}" \
    uv run uvicorn app.gateway.app:app \
      --host "$2" \
      --port "$3" \
      --reload \
      --reload-dir "app" \
      --reload-dir "packages" \
      --reload-exclude "$0/.deer-flow" \
      --reload-exclude "$0/.runtime"
' "${BACKEND_DIR}" "${GATEWAY_CORS_ORIGINS}" "${BACKEND_HOST}" "${BACKEND_PORT}" "${BACKEND_VENDOR_DIR}" \
  >"${LOG_FILE}" 2>&1 &

echo "$!" >"${PID_FILE}"
echo "Backend started (pid $(cat "${PID_FILE}"))."
echo "URL: http://${HOST_IP}:${BACKEND_PORT}"