import json
import re
from django.contrib.auth import authenticate, login as auth_login
from django.http import JsonResponse
from django.views.decorators.csrf import csrf_exempt
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from allauth.account.auth_backends import AuthenticationBackend
from .models import User

@csrf_exempt
def admin_login_view(request):
    if request.user.is_authenticated:
        return redirect('admin_home')

    if request.method == 'POST':
        try:
            body = json.loads(request.body)
            username = body.get('username')
            password = body.get('password')
            user = authenticate(request, username=username, password=password)
            if user is not None:
                user.backend = 'allauth.account.auth_backends.AuthenticationBackend'
                auth_login(request, user)
                return JsonResponse({'code': 200, 'message': '登录成功'})
            else:
                return JsonResponse({'code': 400, 'message': '用户名或密码错误'})
        except json.JSONDecodeError:
            return JsonResponse({'code': 400, 'message': '无效的请求数据'})
        except Exception as e:
            return JsonResponse({'code': 500, 'message': f'服务器内部错误: {str(e)}'})

    return render(request, 'admin/admin_login.html')

@login_required
def admin_home_view(request):
    return render(request, 'admin/home.html')