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

ROOT="${MOUSEHOLD_ROOT:-/mnt/DATA/git/mousehold}"
PYTHON="${PYTHON:-$ROOT/.venv/bin/python}"
NPM="${NPM:-npm}"
BACKEND_HOST="${MOUSEHOLD_BACKEND_HOST:-127.0.0.1}"
BACKEND_PORT="${MOUSEHOLD_BACKEND_PORT:-8000}"
FRONTEND_HOST="${MOUSEHOLD_FRONTEND_HOST:-127.0.0.1}"
FRONTEND_PORT="${MOUSEHOLD_FRONTEND_PORT:-5173}"
OPEN_BROWSER="${OPEN_BROWSER:-1}"

LOG_DIR="$ROOT/data/dev-launcher"
BACKEND_LOG="$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 $ROOT && python -m venv .venv && . .venv/bin/activate && pip install -r requirements-dev.txt && pip install -e ."
command -v "$NPM" >/dev/null 2>&1 || fail "npm not found. Install Node.js/npm, then rerun this launcher."
[ -d "$ROOT/node_modules" ] || fail "node_modules missing. Run: cd $ROOT && npm install"

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

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 Mousehold API at %s\n' "$BACKEND_URL"
(
  cd "$ROOT"
  "$PYTHON" -m uvicorn mousehold_api.main:app --host "$BACKEND_HOST" --port "$BACKEND_PORT" --reload
) >"$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 Mousehold Web UI at %s\n' "$FRONTEND_URL"
(
  cd "$ROOT/apps/web"
  "$NPM" run dev -- --host "$FRONTEND_HOST" --port "$FRONTEND_PORT"
) >"$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

Mousehold is running.
Web UI:  $FRONTEND_URL
API:     $BACKEND_URL
Health:  $BACKEND_URL/health
Docs:    $BACKEND_URL/docs

Logs:
Backend: $BACKEND_LOG
Web UI:  $FRONTEND_LOG

Press Ctrl+C to stop both processes.
EOF

wait