#!/usr/bin/env sh
set -eu

if (set -o pipefail) >/dev/null 2>&1; then
  set -o pipefail
fi

export MSYS_NO_PATHCONV=1

SCRIPT_PATH="$0"
case "$SCRIPT_PATH" in
  /*) ;;
  *) SCRIPT_PATH="$(pwd)/$SCRIPT_PATH" ;;
esac
SCRIPT_DIR="$(CDPATH= cd -- "$(dirname -- "$SCRIPT_PATH")" && pwd)"
ENV_FILE="$SCRIPT_DIR/.env"
ENV_EXAMPLE_FILE="$SCRIPT_DIR/.env.example"
ADMIN_SECRET_FILE="$SCRIPT_DIR/server/.secrets/admin.json"
MODE="${1:-all}"

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m'

info()  { printf '%b\n' "${GREEN}[INFO]${NC} $*"; }
warn()  { printf '%b\n' "${YELLOW}[WARN]${NC} $*"; }
error() { printf '%b\n' "${RED}[ERROR]${NC} $*"; exit 1; }

is_container() {
  [ -f "/.dockerenv" ] && return 0

  if [ -r /proc/1/cgroup ] && grep -Eq "(docker|containerd|kubepods)" /proc/1/cgroup 2>/dev/null; then
    return 0
  fi

  return 1
}

if [ ! -f "$ENV_FILE" ]; then
  if [ -f "$ENV_EXAMPLE_FILE" ]; then
    warn ".env not found. Creating it from .env.example"
    cp "$ENV_EXAMPLE_FILE" "$ENV_FILE"
  else
    error ".env and .env.example are both missing."
  fi
fi

ENV_OVERRIDE_WEB_HOST_SET=false
ENV_OVERRIDE_SERVER_HOST_SET=false
ENV_OVERRIDE_ONLYOFFICE_ENABLED_SET=false
ENV_OVERRIDE_ONLYOFFICE_PUBLIC_URL_SET=false
ENV_OVERRIDE_ONLYOFFICE_BACKEND_URL_SET=false
ENV_OVERRIDE_ONLYOFFICE_JWT_SECRET_SET=false
PREFER_ENV_FILE_FOR_ONLYOFFICE=false

case "${X_FINANCIAL_PREFER_ENV_FILE:-false}" in
  1|true|TRUE|yes|YES|on|ON)
    PREFER_ENV_FILE_FOR_ONLYOFFICE=true
    ;;
esac

if [ "${WEB_HOST+x}" = x ]; then
  ENV_OVERRIDE_WEB_HOST_SET=true
  ENV_OVERRIDE_WEB_HOST="$WEB_HOST"
fi

if [ "${SERVER_HOST+x}" = x ]; then
  ENV_OVERRIDE_SERVER_HOST_SET=true
  ENV_OVERRIDE_SERVER_HOST="$SERVER_HOST"
fi

if [ "$PREFER_ENV_FILE_FOR_ONLYOFFICE" != true ] && [ "${ONLYOFFICE_ENABLED+x}" = x ]; then
  ENV_OVERRIDE_ONLYOFFICE_ENABLED_SET=true
  ENV_OVERRIDE_ONLYOFFICE_ENABLED="$ONLYOFFICE_ENABLED"
fi

if [ "$PREFER_ENV_FILE_FOR_ONLYOFFICE" != true ] && [ "${ONLYOFFICE_PUBLIC_URL+x}" = x ]; then
  ENV_OVERRIDE_ONLYOFFICE_PUBLIC_URL_SET=true
  ENV_OVERRIDE_ONLYOFFICE_PUBLIC_URL="$ONLYOFFICE_PUBLIC_URL"
fi

if [ "$PREFER_ENV_FILE_FOR_ONLYOFFICE" != true ] && [ "${ONLYOFFICE_BACKEND_URL+x}" = x ]; then
  ENV_OVERRIDE_ONLYOFFICE_BACKEND_URL_SET=true
  ENV_OVERRIDE_ONLYOFFICE_BACKEND_URL="$ONLYOFFICE_BACKEND_URL"
fi

if [ "$PREFER_ENV_FILE_FOR_ONLYOFFICE" != true ] && [ "${ONLYOFFICE_JWT_SECRET+x}" = x ]; then
  ENV_OVERRIDE_ONLYOFFICE_JWT_SECRET_SET=true
  ENV_OVERRIDE_ONLYOFFICE_JWT_SECRET="$ONLYOFFICE_JWT_SECRET"
fi

set -a
. "$ENV_FILE"
set +a

if [ "$ENV_OVERRIDE_WEB_HOST_SET" = true ]; then
  WEB_HOST="$ENV_OVERRIDE_WEB_HOST"
fi

if [ "$ENV_OVERRIDE_SERVER_HOST_SET" = true ]; then
  SERVER_HOST="$ENV_OVERRIDE_SERVER_HOST"
fi

if [ "$ENV_OVERRIDE_ONLYOFFICE_ENABLED_SET" = true ]; then
  ONLYOFFICE_ENABLED="$ENV_OVERRIDE_ONLYOFFICE_ENABLED"
fi

if [ "$ENV_OVERRIDE_ONLYOFFICE_PUBLIC_URL_SET" = true ]; then
  ONLYOFFICE_PUBLIC_URL="$ENV_OVERRIDE_ONLYOFFICE_PUBLIC_URL"
fi

if [ "$ENV_OVERRIDE_ONLYOFFICE_BACKEND_URL_SET" = true ]; then
  ONLYOFFICE_BACKEND_URL="$ENV_OVERRIDE_ONLYOFFICE_BACKEND_URL"
fi

if [ "$ENV_OVERRIDE_ONLYOFFICE_JWT_SECRET_SET" = true ]; then
  ONLYOFFICE_JWT_SECRET="$ENV_OVERRIDE_ONLYOFFICE_JWT_SECRET"
fi

SERVER_STARTUP_TIMEOUT="${SERVER_STARTUP_TIMEOUT:-300}"
SERVER_SMOKE_CHECK_ENABLED="${SERVER_SMOKE_CHECK_ENABLED:-false}"
SETUP_COMPLETED="${SETUP_COMPLETED:-false}"
APP_DEBUG="${APP_DEBUG:-true}"
APP_ENV="${APP_ENV:-local}"
SERVER_RELOAD="${SERVER_RELOAD:-}"
DEFAULT_SERVER_RELOAD="false"

case "$APP_ENV" in
  local|dev|development)
    DEFAULT_SERVER_RELOAD="true"
    ;;
esac

if [ "$APP_DEBUG" = "true" ]; then
  DEFAULT_SERVER_RELOAD="true"
fi

if is_container; then
  DEFAULT_SERVER_RELOAD="false"
fi

EFFECTIVE_SERVER_RELOAD="${SERVER_RELOAD:-$DEFAULT_SERVER_RELOAD}"

setup_ready() {
  [ "$SETUP_COMPLETED" = "true" ] && [ -f "$ADMIN_SECRET_FILE" ]
}

server_probe_host() {
  case "${SERVER_HOST:-127.0.0.1}" in
    0.0.0.0|::)
      echo "127.0.0.1"
      ;;
    *)
      echo "${SERVER_HOST:-127.0.0.1}"
      ;;
  esac
}

server_probe_url() {
  echo "http://$(server_probe_host):${SERVER_PORT:-8000}${API_V1_PREFIX:-/api/v1}/health"
}

server_smoke_url() {
  echo "http://$(server_probe_host):${SERVER_PORT:-8000}${API_V1_PREFIX:-/api/v1}/employees/meta"
}

server_probe_python() {
  if [ -x "$SCRIPT_DIR/server/.venv/Scripts/python.exe" ]; then
    echo "$SCRIPT_DIR/server/.venv/Scripts/python.exe"
    return 0
  fi

  if [ -x "$SCRIPT_DIR/server/.venv/bin/python" ]; then
    echo "$SCRIPT_DIR/server/.venv/bin/python"
    return 0
  fi

  return 1
}

probe_server_health() {
  _probe_url="${1:-$(server_probe_url)}"
  _probe_python=""

  if _probe_python="$(server_probe_python)"; then
    "$_probe_python" -c "import json, sys, urllib.request; data = json.load(urllib.request.urlopen(sys.argv[1], timeout=2)); raise SystemExit(0 if data.get('status') == 'ok' else 1)" "$_probe_url" >/dev/null 2>&1
    return $?
  fi

  if command -v curl >/dev/null 2>&1; then
    curl --silent --fail --max-time 2 "$_probe_url" | grep -q '"status"[[:space:]]*:[[:space:]]*"ok"'
    return $?
  fi

  return 1
}

probe_server_smoke() {
  _probe_url="${1:-$(server_smoke_url)}"
  _probe_python=""

  if _probe_python="$(server_probe_python)"; then
    "$_probe_python" -c "import sys, urllib.request; response = urllib.request.urlopen(sys.argv[1], timeout=3); raise SystemExit(0 if response.status == 200 else 1)" "$_probe_url" >/dev/null 2>&1
    return $?
  fi

  if command -v curl >/dev/null 2>&1; then
    curl --silent --fail --max-time 3 "$_probe_url" >/dev/null 2>&1
    return $?
  fi

  return 1
}

probe_server_port_open() {
  _probe_python=""
  _probe_host="$(server_probe_host)"
  _probe_port="${SERVER_PORT:-8000}"

  if _probe_python="$(server_probe_python)"; then
    "$_probe_python" -c "import socket, sys; sock = socket.socket(); sock.settimeout(1.5); result = sock.connect_ex((sys.argv[1], int(sys.argv[2]))); sock.close(); raise SystemExit(0 if result == 0 else 1)" "$_probe_host" "$_probe_port" >/dev/null 2>&1
    return $?
  fi

  if command -v ss >/dev/null 2>&1; then
    ss -ltn | grep -q "[.:]${_probe_port}[[:space:]]"
    return $?
  fi

  return 1
}

probe_server_ready() {
  _health_url="${1:-$(server_probe_url)}"
  _smoke_url="${2:-$(server_smoke_url)}"

  probe_server_health "$_health_url" || return 1

  case "$SERVER_SMOKE_CHECK_ENABLED" in
    1|true|TRUE|yes|YES|on|ON)
      probe_server_smoke "$_smoke_url"
      return $?
      ;;
  esac

  return 0
}

prepare_web() {
  info "Preparing web dependencies..."
  (
    cd "$SCRIPT_DIR/web"
    ./web_start.sh deps
  )
}

prepare_server() {
  info "Preparing server dependencies..."
  (
    cd "$SCRIPT_DIR/server"
    ./server_start.sh deps
  )
}

start_web() {
  prepare_web
  cd "$SCRIPT_DIR/web"
  exec ./web_start.sh start
}

start_server() {
  prepare_server
  cd "$SCRIPT_DIR/server"
  exec ./server_start.sh start
}

start_setup_web() {
  warn "Initial setup is not completed. Starting web only."
  warn "Setup requires both .env completion and server/.secrets/admin.json."
  warn "Finish the setup form first; the web setup bridge will start FastAPI after saving."
  prepare_web
  cd "$SCRIPT_DIR/web"
  export X_FINANCIAL_FORCE_SETUP=true
  exec ./web_start.sh start
}

start_all() {
  server_pid=""
  started_server=false
  probe_url=""
  smoke_url=""

  prepare_server

  cleanup() {
    if [ "$started_server" = true ] && [ -n "$server_pid" ] && kill -0 "$server_pid" 2>/dev/null; then
      warn "Stopping FastAPI server..."
      kill "$server_pid" 2>/dev/null || true
      wait "$server_pid" 2>/dev/null || true
    fi
  }

  trap cleanup EXIT INT TERM

  probe_url="$(server_probe_url)"
  smoke_url="$(server_smoke_url)"

  if probe_server_ready "$probe_url" "$smoke_url"; then
    warn "FastAPI is already ready at $probe_url. Reusing the existing backend process."
    if [ "$APP_DEBUG" = "true" ] && [ "$EFFECTIVE_SERVER_RELOAD" != "true" ]; then
      warn "This backend may be stale because SERVER_RELOAD is disabled. If new API routes are missing, stop the old backend process and rerun ./start.sh."
    fi
  elif probe_server_health "$probe_url"; then
    error "An existing backend process is responding at $probe_url, but the smoke check failed at $smoke_url. Stop the old FastAPI process and rerun ./start.sh."
  elif probe_server_port_open; then
    error "Port ${SERVER_PORT:-8000} is already occupied, but FastAPI health checks are not passing at $probe_url. Stop the stale backend process and rerun ./start.sh."
  else
    info "Starting FastAPI server..."
    (
      cd "$SCRIPT_DIR/server"
      ./server_start.sh start
    ) &
    server_pid=$!
    started_server=true
  fi

  wait_for_server_ready() {
    attempt=1
    max_attempts="$SERVER_STARTUP_TIMEOUT"

    info "Waiting for FastAPI readiness before starting the web frontend..."

    while [ "$attempt" -le "$max_attempts" ]; do
      if probe_server_ready "$probe_url" "$smoke_url"; then
        info "FastAPI is ready. Starting web frontend next."
        return 0
      fi

      if [ "$started_server" = true ] && ! kill -0 "$server_pid" 2>/dev/null; then
        if probe_server_ready "$probe_url" "$smoke_url"; then
          warn "FastAPI is already available at $probe_url. Continuing with the existing process."
          started_server=false
          server_pid=""
          return 0
        fi

        wait "$server_pid" 2>/dev/null || true
        error "FastAPI process exited before becoming ready. Run ./server/server_start.sh start directly to inspect the backend error."
      fi

      sleep 1
      attempt=$((attempt + 1))
    done

    if probe_server_health "$probe_url"; then
      error "FastAPI answered health checks at $probe_url, but the smoke check failed at $smoke_url. The running backend is stale or incompatible."
    fi

    error "FastAPI did not become ready within ${SERVER_STARTUP_TIMEOUT}s. Inspect server/logs/app.log."
  }

  wait_for_server_ready

  prepare_web
  info "Starting web frontend..."
  cd "$SCRIPT_DIR/web"
  ./web_start.sh start
}

case "$MODE" in
  web)
    start_web
    ;;
  server)
    start_server
    ;;
  all)
    if setup_ready; then
      start_all
    else
      start_setup_web
    fi
    ;;
  *)
    error "Unknown mode: $MODE. Use one of: web, server, all"
    ;;
esac