from django.contrib import admin
from django.urls import path
from example import views

urlpatterns = [
    path('admin/', admin.site.urls),
    path('callback', views.callback),
]

from django.shortcuts import render

# Create your views here.
from django.conf import settings
from django.http import HttpResponse, HttpResponseBadRequest, HttpResponseForbidden
from django.views.decorators.csrf import csrf_exempt

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

line_bot_api = LineBotApi(settings.LINE_CHANNEL_ACCESS_TOKEN)
parser = WebhookParser(settings.LINE_CHANNEL_SECRET)


@csrf_exempt
def callback(request):
    if request.method == 'POST':
        signature = request.META['HTTP_X_LINE_SIGNATURE']
        body = request.body.decode('utf-8')

        try:
            events = parser.parse(body, signature)
        except InvalidSignatureError:
            return HttpResponseForbidden()
        except LineBotApiError:
            return HttpResponseBadRequest()

        for event in events:
            if isinstance(event, MessageEvent):
                mtext=event.message.text
                message=[]
                message.append(TextSendMessage(text=mtext))
                line_bot_api.reply_message(event.reply_token,message)

        return HttpResponse()
    else:
        return HttpResponseBadRequest()