# backend/crm_backend/settings.py
INSTALLED_APPS = [
    'django.contrib.admin',
    ...
    # Local apps
    'customers',

    'line_bot',  # 新增 LINE Bot app
]

# backend/crm_backend/settings.py
ALLOWED_HOSTS = ['yourdomain.com', 'localhost', '127.0.0.1']

# backend/line_bot/apps.py
from django.apps import AppConfig

class LineBotConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'line_bot'

# backend/line_bot/views.py
...

# 載入專案根目錄的 .env 檔案
PROJECT_ROOT = Path(__file__).resolve().parent.parent.parent
ENV_FILE = PROJECT_ROOT / '.env'
load_dotenv(ENV_FILE)

from linebot import LineBotApi, WebhookHandler
from linebot.exceptions import InvalidSignatureError, LineBotApiError
from linebot.models import MessageEvent, TextMessage, TextSendMessage

# 設置日誌
logger = logging.getLogger(__name__)

# LINE Bot 設定 - 從環境變數讀取
LINE_CHANNEL_SECRET = os.getenv('LINE_CHANNEL_SECRET')
LINE_CHANNEL_ACCESS_TOKEN = os.getenv('LINE_CHANNEL_ACCESS_TOKEN')

# 驗證環境變數是否存在
if not LINE_CHANNEL_SECRET or not LINE_CHANNEL_ACCESS_TOKEN:
    logger.error("LINE Bot 環境變數未設置！請檢查 .env 檔案")
    raise ValueError("LINE Bot 環境變數未設置")

line_bot_api = LineBotApi(LINE_CHANNEL_ACCESS_TOKEN)
handler = WebhookHandler(LINE_CHANNEL_SECRET)


@csrf_exempt
@require_POST
def webhook(request):
    """LINE Bot Webhook 處理器"""

    # 獲取請求內容
    body = request.body.decode('utf-8')
    signature = request.META.get('HTTP_X_LINE_SIGNATURE', '')

    # 記錄接收到的請求
    logger.info(f"收到 LINE Webhook 請求: {body}")
    logger.info(f"Signature: {signature}")

    try:
        # 驗證簽名並處理事件
        handler.handle(body, signature)
    except InvalidSignatureError:
        logger.error("無效的簽名")
        return HttpResponseBadRequest("Invalid signature")
    except Exception as e:
        logger.error(f"處理 Webhook 時發生錯誤: {str(e)}")
        return HttpResponseBadRequest(f"Error: {str(e)}")

    return HttpResponse("OK")


@handler.add(MessageEvent, message=TextMessage)
def handle_text_message(event):
    """處理文字訊息"""
    user_id = event.source.user_id
    user_message = event.message.text

    # 記錄收到的訊息
    logger.info(f"收到使用者 {user_id} 的訊息: {user_message}")
    # 簡單的回應邏輯
    reply_message = f"您好！我收到了您的訊息：「{user_message}」"

    try:
        # 回覆訊息
        line_bot_api.reply_message(
            event.reply_token,
            TextSendMessage(text=reply_message)
        )
        logger.info(f"成功回覆訊息給使用者 {user_id}")

    except LineBotApiError as e:
        logger.error(f"回覆訊息時發生錯誤: {e.message}")


def test_connection(request):
    """測試連接的簡單端點"""
    return HttpResponse("LINE Bot 服務運行中！")

# backend/line_bot/urls.py
from django.urls import path
from . import views

app_name = 'line_bot'

urlpatterns = [
    path('webhook/', views.webhook, name='webhook'),  # LINE Bot Webhook 處理器
    path('test/', views.test_connection, name='test'),  # 最基本的連接測試
]

# backend/crm_backend/urls.py

...

urlpatterns = [
    path('admin/', admin.site.urls),
    ...
    path('api/line-bot/', include('line_bot.urls')),  # 新增 LINE Bot 路由
]