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

ROOT="${GOVOPLAN_CORE_ROOT:-/mnt/DATA/git/govoplan-core}"
WEBUI_ROOT="$ROOT/webui"
PYTHON="${PYTHON:-$ROOT/.venv/bin/python}"
NODE_BIN="${NODE_BIN:-/home/zemion/.nvm/versions/node/v22.22.3/bin}"
NPM="${NPM:-$NODE_BIN/npm}"

BACKEND_HOST="${GOVOPLAN_BACKEND_HOST:-127.0.0.1}"
BACKEND_PORT="${GOVOPLAN_BACKEND_PORT:-8000}"
FRONTEND_HOST="${GOVOPLAN_FRONTEND_HOST:-127.0.0.1}"
FRONTEND_PORT="${GOVOPLAN_FRONTEND_PORT:-5173}"
OPEN_BROWSER="${OPEN_BROWSER:-1}"
FRONTEND_FORCE_RELOAD="${GOVOPLAN_FRONTEND_FORCE_RELOAD:-1}"
FRONTEND_CLEAR_VITE_CACHE="${GOVOPLAN_FRONTEND_CLEAR_VITE_CACHE:-1}"
FRONTEND_USE_POLLING="${GOVOPLAN_FRONTEND_USE_POLLING:-1}"
FRONTEND_POLLING_INTERVAL="${GOVOPLAN_FRONTEND_POLLING_INTERVAL:-500}"

LOG_DIR="$ROOT/runtime/dev-launcher"
BACKEND_LOG="$LOG_DIR/backend.log"
FRONTEND_LOG="$LOG_DIR/frontend.log"
BACKEND_URL="http://$BACKEND_HOST:$BACKEND_PORT"
FRONTEND_URL="http://$FRONTEND_HOST:$FRONTEND_PORT"

backend_pid=""
frontend_pid=""

fail() {
  printf 'launch-dev: %s\n' "$*" >&2
  exit 1
}

port_is_free() {
  "$PYTHON" - "$1" "$2" <<'PY'
import socket
import sys

host = sys.argv[1]
port = int(sys.argv[2])
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    try:
        sock.bind((host, port))
    except OSError:
        raise SystemExit(1)
PY
}

wait_for_url() {
  "$PYTHON" - "$1" <<'PY'
import sys
import time
import urllib.request

url = sys.argv[1]
deadline = time.monotonic() + 60
last_error = None
while time.monotonic() < deadline:
    try:
        with urllib.request.urlopen(url, timeout=2) as response:
            if 200 <= response.status < 500:
                raise SystemExit(0)
    except Exception as exc:  # noqa: BLE001 - printed only on timeout.
        last_error = exc
    time.sleep(1)
print(f"Timed out waiting for {url}: {last_error}", file=sys.stderr)
raise SystemExit(1)
PY
}

cleanup() {
  if [ -n "${frontend_pid:-}" ] && kill -0 "$frontend_pid" 2>/dev/null; then
    kill "$frontend_pid" 2>/dev/null || true
  fi
  if [ -n "${backend_pid:-}" ] && kill -0 "$backend_pid" 2>/dev/null; then
    kill "$backend_pid" 2>/dev/null || true
  fi
}
trap cleanup EXIT INT TERM

[ -x "$PYTHON" ] || fail "Python virtualenv not found at $PYTHON. Run: cd $ROOT && ./.venv/bin/python -m pip install -r requirements-dev.txt"
[ -x "$NPM" ] || fail "npm not found at $NPM. Set NODE_BIN or NPM to your Node installation."
[ -f "$WEBUI_ROOT/package.json" ] || fail "WebUI package.json not found at $WEBUI_ROOT/package.json"
[ -d "$WEBUI_ROOT/node_modules" ] || fail "WebUI node_modules missing. Run: cd $WEBUI_ROOT && PATH=$NODE_BIN:\$PATH $NPM install"

mkdir -p "$LOG_DIR"
: > "$BACKEND_LOG"
: > "$FRONTEND_LOG"

if [ "$FRONTEND_CLEAR_VITE_CACHE" = "1" ]; then
  rm -rf "$WEBUI_ROOT/node_modules/.vite" "$WEBUI_ROOT/node_modules/.vite-temp"
fi

port_is_free "$BACKEND_HOST" "$BACKEND_PORT" || fail "$BACKEND_URL is already in use"
port_is_free "$FRONTEND_HOST" "$FRONTEND_PORT" || fail "$FRONTEND_URL is already in use"

printf 'Starting GovOPlaN backend at %s\n' "$BACKEND_URL"
(
  cd "$ROOT"
  "$PYTHON" -m govoplan_core.devserver --host "$BACKEND_HOST" --port "$BACKEND_PORT"
) >"$BACKEND_LOG" 2>&1 &
backend_pid="$!"

printf 'Waiting for %s/health\n' "$BACKEND_URL"
wait_for_url "$BACKEND_URL/health" || {
  tail -n 80 "$BACKEND_LOG" >&2 || true
  fail "backend did not become healthy"
}

printf 'Starting GovOPlaN WebUI at %s\n' "$FRONTEND_URL"
(
  cd "$WEBUI_ROOT"
  frontend_args=(run dev)
  if [ "$FRONTEND_FORCE_RELOAD" = "1" ]; then
    frontend_args+=(-- --force)
  fi
  PATH="$WEBUI_ROOT/node_modules/.bin:$NODE_BIN:$PATH" \
    CHOKIDAR_USEPOLLING="$FRONTEND_USE_POLLING" \
    CHOKIDAR_INTERVAL="$FRONTEND_POLLING_INTERVAL" \
    VITE_API_PROXY_TARGET="$BACKEND_URL" \
    "$NPM" "${frontend_args[@]}"
) >"$FRONTEND_LOG" 2>&1 &
frontend_pid="$!"

printf 'Waiting for %s\n' "$FRONTEND_URL"
wait_for_url "$FRONTEND_URL" || {
  tail -n 80 "$FRONTEND_LOG" >&2 || true
  fail "frontend did not become reachable"
}

if [ "$OPEN_BROWSER" = "1" ] && command -v xdg-open >/dev/null 2>&1; then
  xdg-open "$FRONTEND_URL" >/dev/null 2>&1 || true
fi

cat <<EOF

GovOPlaN is running.
Web UI:  $FRONTEND_URL
API:     $BACKEND_URL/api/v1
Health:  $BACKEND_URL/health

Logs:
Backend: $BACKEND_LOG
WebUI:   $FRONTEND_LOG

Frontend reload:
Vite cache cleared: $FRONTEND_CLEAR_VITE_CACHE
Vite --force:       $FRONTEND_FORCE_RELOAD
Watch polling:      $FRONTEND_USE_POLLING (${FRONTEND_POLLING_INTERVAL}ms)

Press Ctrl+C to stop both processes.
EOF

wait