from django.shortcuts import render
from django.http.response import JsonResponse,HttpResponse
from django.views.decorators.csrf import csrf_exempt # CSRF装饰器
from django.views.decorators.http import require_http_methods,require_safe,require_GET
from django.contrib.auth.decorators import login_required # 登录需求装饰器
from django.core.exceptions import PermissionDenied,ObjectDoesNotExist
from django.conf import settings
from django.contrib.auth import authenticate,login,logout # 认证相关方法
from django.contrib.auth.models import User # Django默认用户模型
from django.shortcuts import render,redirect
from django.utils.translation import gettext_lazy as _
from app_doc.util_upload_img import upload_generation_dir,base_img_upload
from app_api.models import UserToken
from app_doc.models import Project,Doc,DocHistory,Image
from loguru import logger
import time,hashlib
import traceback,json
import datetime

# MrDoc 基于用户的Token访问API模块

# 用户通过该url获取服务器时间戳，便于接口访问
# url范例：http://127.0.0.1:8000/api/get_timestamp/
def get_timestamp(request):
    now_time = str(int(time.time()))
    return JsonResponse({'status':True,'data':now_time})

def oauth0(request):
    # url范例：http://127.0.0.1:8000/api/oauth0/?username=huyang&timestamp=1608797025&randstr=123adsfadf&hashstr=c171ce95ef3789d922cb6663c678c255&redirecturl=http%3A%2F%2F127.0.0.1%3A8000%2Fproject-1%2Fdoc-10%2F
    if request.method == 'GET':
        try:
            username = request.GET.get("username","")
            timestamp = request.GET.get("timestamp","")
            randstr = request.GET.get("randstr","")
            hashstr = request.GET.get("hashstr","")
            redirecturl = request.GET.get("redirecturl","/") 
            if redirecturl == "" :
                # 必须用判断的方式，否则url里提交redirecturl= 还是为空
                redirecturl =  "/"                
            if "" not in [username,timestamp,randstr,hashstr] :
                # 都不为空，才验证哦
                # 1 、验证timestamp的时效性
                nowtime = int (time.time())
                # 时间戳失效时间，默认为3600，可以改短，如30，严格点5秒，如果使用5秒，请求前，需要通过get_timestamp获取服务器时间戳，否则因为和服务器时间差导致无法验证通过
                if (nowtime - int(timestamp)) > 3600 :                    
                    raise ValueError(_('链接已失效，请从合法路径访问，或联系管理员！'))
                # 2、获取userid的Token
                user = User.objects.get(username=username)                                
                if user is None:
                    raise ValueError(_('请求用户出错！'))
                ID = user.id
                State = user.is_active
                if State == 1 and ID is not None:
                    usertoken = UserToken.objects.get(user_id=ID)
                    token = usertoken.token
                else:
                    raise ValueError(_('非法用户！'))
            
                # 3、 验证hash的正确性
                final_str  =  str(randstr) + str(timestamp) + str(username) + token
                md5 = hashlib.md5(final_str.encode("utf-8")).hexdigest()        # 不支持中文
                if md5 == hashstr:
                    # 用户验证成功                   
                    login(request,user)
                    from urllib.parse import unquote
                    newurl = unquote(redirecturl)
                    return redirect(newurl)
                else:                    
                    raise ValueError(_('验证失败,可能是用户名或Token不正确!详情请联系管理员！'))
            else:
                raise ValueError(_('关键字验证失败，请联系管理员！部分关键字为空'))
        except ValueError as e:
            errormsg = e
            return render(request, 'app_api/api404.html', locals())
        except :
            errormsg = _("API接口运行出错！")
            return render(request, 'app_api/api404.html', locals())
    else:
        return JsonResponse({'status':False,'data':'Nothing Here'}) 


# Token管理页面
@require_http_methods(['POST','GET'])
@login_required()
def manage_token(request):
    if request.method == 'GET':
        try:
            token = UserToken.objects.get(user=request.user).token # 查询用户Token
        except ObjectDoesNotExist:
            token = _('你还没有生成过Token！')
        except:
            if settings.DEBUG:
                logger.exception(_("Token管理页面异常"))
        return render(request,'app_api/manage_token.html',locals())
    elif request.method == 'POST':
        try:
            user = request.user
            now_time =str(time.time())
            string = 'user_{}_time_{}'.format(user,now_time).encode('utf-8')
            token_str = hashlib.sha224(string).hexdigest()
            user_token = UserToken.objects.filter(user=user)
            if user_token.exists():
                UserToken.objects.get(user=user).delete()
            UserToken.objects.create(
                user=user,
                token=token_str
            )
            return JsonResponse({'status':True,'data':token_str})
        except:
            logger.exception(_("用户Token生成异常"))
            return JsonResponse({'status':False,'data':_('生成出错，请重试！')})


# 获取文集
@require_GET
def get_projects(request):
    token = request.GET.get('token','')
    try:
        token = UserToken.objects.get(token=token)
        projects = Project.objects.filter(create_user=token.user) # 查询文集
        project_list =  []
        for project in projects:
            item = {
                'id':project.id, # 文集ID
                'name':project.name, # 文集名称
                'type':project.role # 文集状态
            }
            project_list.append(item)
        return JsonResponse({'status':True,'data':project_list})
    except ObjectDoesNotExist:
        return JsonResponse({'status':False,'data':_('token无效')})
    except:
        logger.exception(_("token获取文集异常"))
        return JsonResponse({'status':False,'data':_('系统异常')})


# 获取文集下的文档列表
def get_docs(request):
    token = request.GET.get('token', '')
    try:
        token = UserToken.objects.get(token=token)
        pid = request.GET.get('pid','')
        docs = Doc.objects.filter(create_user=token.user,top_doc=pid)  # 查询文集下的文档
        doc_list = []
        for doc in docs:
            item = {
                'id': doc.id,  # 文档ID
                'name': doc.name,  # 文档名称
                'parent_doc':doc.parent_doc, # 上级文档
                'top_doc':doc.top_doc, # 所属文集
                'status':doc.status, # 文档状态
                'create_time': doc.create_time,  # 文档创建时间
                'modify_time': doc.modify_time,  # 文档的修改时间
                'create_user': doc.create_user.username  # 文档的创建者
            }
            doc_list.append(item)
        return JsonResponse({'status': True, 'data': doc_list})
    except ObjectDoesNotExist:
        return JsonResponse({'status': False, 'data': _('token无效')})
    except:
        logger.exception(_("token获取文集异常"))
        return JsonResponse({'status': False, 'data': _('系统异常')})


# 获取单篇文档
def get_doc(request):
    token = request.GET.get('token', '')
    try:
        token = UserToken.objects.get(token=token)
        did = request.GET.get('did', '')
        doc = Doc.objects.get(create_user=token.user, id=did)  # 查询文集下的文档

        item = {
            'id': doc.id,  # 文档ID
            'name': doc.name,  # 文档名称
            'md_content':doc.pre_content, # 文档内容
            'parent_doc':doc.parent_doc, # 上级文档
            'top_doc':doc.top_doc, # 所属文集
            'status':doc.status, # 文档状态
            'create_time': doc.create_time,  # 文档创建时间
            'modify_time': doc.modify_time,  # 文档的修改时间
            'create_user': doc.create_user.username  # 文档的创建者
        }
        return JsonResponse({'status': True, 'data': item})
    except ObjectDoesNotExist:
        return JsonResponse({'status': False, 'data': _('token无效')})
    except:
        logger.exception("token获取文集异常")
        return JsonResponse({'status': False, 'data': _('系统异常')})


# 新建文集
@require_http_methods(['GET','POST'])
@csrf_exempt
def create_project(request):
    token = request.GET.get('token', '')
    project_name = request.POST.get('name','')
    project_desc = request.POST.get('desc','')
    project_role = request.POST.get('role',1)
    try:
        # 验证Token
        token = UserToken.objects.get(token=token)
        Project.objects.create(
            name = project_name, # 文集名称
            intro = project_desc, # 文集简介
            role = project_role, # 文集权限
            create_user = token.user # 创建的用户
        )
        return JsonResponse({'status': True, 'data': 'ok'})
    except ObjectDoesNotExist:
        return JsonResponse({'status': False, 'data': _('token无效')})
    except:
        logger.exception(_("token创建文集异常"))
        return JsonResponse({'status':False,'data':_('系统异常')})


# 新建文档
@require_http_methods(['GET','POST'])
@csrf_exempt
def create_doc(request):
    token = request.GET.get('token', '')
    project_id = request.POST.get('pid','')
    doc_title = request.POST.get('title','')
    doc_content = request.POST.get('doc','')
    editor_mode = request.POST.get('editor_mode',1)
    try:
        # 验证Token
        token = UserToken.objects.get(token=token)
        # 文集是否属于用户
        is_project = Project.objects.filter(create_user=token.user,id=project_id)
        # 新建文档
        if is_project.exists():
            Doc.objects.create(
                name = doc_title, # 文档内容
                pre_content = doc_content, # 文档的编辑内容，意即编辑框输入的内容
                top_doc = project_id, # 所属文集
                editor_mode = editor_mode, # 编辑器模式
                create_user = token.user # 创建的用户
            )
            return JsonResponse({'status': True, 'data': 'ok'})
        else:
            return JsonResponse({'status':False,'data':_('非法请求')})
    except ObjectDoesNotExist:
        return JsonResponse({'status': False, 'data': _('token无效')})
    except:
        logger.exception(_("token创建文档异常"))
        return JsonResponse({'status':False,'data':_('系统异常')})

# 更新修改文档
@require_http_methods(['GET','POST'])
@csrf_exempt
def modify_doc(request):
    token = request.GET.get('token', '')
    project_id = request.POST.get('pid','')
    doc_id = request.POST.get('did', '')
    doc_title = request.POST.get('title','')
    doc_content = request.POST.get('doc','')
    try:
        # 验证Token
        token = UserToken.objects.get(token=token)
        # 文集是否属于用户
        is_project = Project.objects.filter(create_user=token.user,id=project_id)
        # 修改现有文档
        if is_project.exists():
            # 将现有文档内容写入到文档历史中
            doc = Doc.objects.get(id=doc_id)
            DocHistory.objects.create(
                doc=doc,
                pre_content=doc.pre_content,
                create_user=token.user
            )
            # 更新修改现有文档
            Doc.objects.filter(id=int(doc_id)).update(
                name=doc_title,
                pre_content=doc_content,
                modify_time=datetime.datetime.now(),
            )
            return JsonResponse({'status': True, 'data': 'ok'})
        else:
            return JsonResponse({'status':False,'data':'非法请求'})
    except ObjectDoesNotExist:
        return JsonResponse({'status': False, 'data': 'token无效'})
    except:
        logger.exception("token修改文档异常")
        return JsonResponse({'status':False,'data':'系统异常'})
    
# 上传图片
@csrf_exempt
@require_http_methods(['GET','POST'])
def upload_img(request):
    ##################
    # {"success": 0, "message": "出错信息"}
    # {"success": 1, "url": "图片地址"}
    ##################
    token = request.GET.get('token', '')
    base64_img = request.POST.get('data','')
    try:
        # 验证Token
        token = UserToken.objects.get(token=token)
        # 上传图片
        result = base_img_upload(base64_img, '', token.user)
        return JsonResponse(result)
        # return HttpResponse(json.dumps(result), content_type="application/json")
    except ObjectDoesNotExist:
        return JsonResponse({'success': 0, 'data': _('token无效')})
    except:
        logger.exception(_("token上传图片异常"))
        return JsonResponse({'success':0,'data':_('上传出错')})