#!/usr/bin/env bash

set -u

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
REPO_ROOT="$(cd -- "$SCRIPT_DIR/.." && pwd -P)"
FRONTEND_DIR="$REPO_ROOT/frontend"

node_version_supported() {
  local version="$1"
  local major
  local minor

  [[ "$version" =~ ^v([0-9]+)\.([0-9]+)\.([0-9]+) ]] || return 1
  major=$((10#${BASH_REMATCH[1]}))
  minor=$((10#${BASH_REMATCH[2]}))
  (( (major == 20 && minor >= 19) || (major == 22 && minor >= 12) || major >= 23 ))
}

if [[ ! -f "$FRONTEND_DIR/package.json" ]]; then
  echo "[ERROR] Frontend package.json was not found:" >&2
  echo "        $FRONTEND_DIR/package.json" >&2
  exit 1
fi

NODE_EXE=""
NPM_EXE=""
for candidate in "$REPO_ROOT"/.tools/node-*-linux-x64/bin; do
  if [[ -x "$candidate/node" && -x "$candidate/npm" ]]; then
    CANDIDATE_VERSION="$("$candidate/node" --version 2>/dev/null || true)"
    if node_version_supported "$CANDIDATE_VERSION"; then
      NODE_EXE="$candidate/node"
      NPM_EXE="$candidate/npm"
      PATH="$candidate:${PATH:-}"
      break
    fi
  fi
done
export PATH

if [[ -z "$NODE_EXE" ]]; then
  NODE_EXE="$(command -v node || true)"
  NPM_EXE="$(command -v npm || true)"
fi

if [[ -z "$NODE_EXE" || -z "$NPM_EXE" ]]; then
  echo "[ERROR] Node.js and npm were not found." >&2
  echo "Install Node.js 20.19+ or 22.12+ and make node/npm available on PATH." >&2
  exit 1
fi

NODE_VERSION="$("$NODE_EXE" --version 2>/dev/null || true)"
if ! node_version_supported "$NODE_VERSION"; then
  echo "[ERROR] Unsupported Node.js version: $NODE_VERSION" >&2
  echo "Vite requires Node.js 20.19+ or 22.12+ (Node.js 21 is not supported)." >&2
  exit 1
fi

if [[ ! -x "$FRONTEND_DIR/node_modules/.bin/vite" ]]; then
  echo "[ERROR] Frontend dependencies are not installed." >&2
  echo "Run the following command first:" >&2
  echo "        cd \"$FRONTEND_DIR\" && \"$NPM_EXE\" ci" >&2
  exit 1
fi

cd "$FRONTEND_DIR"

echo "Starting ReactFlow at http://127.0.0.1:5173"
echo "Press Ctrl+C to stop the service."
echo

exec "$NPM_EXE" run dev -- --strictPort