from django.core.cache import cache
from django.views.generic import View
from libs import JsonParser, Argument, human_time, json_response
from .models import User
import time
import uuid


class UserView(View):
    def get(self, request):
        users = User.objects.filter(is_supper=False, deleted_by_id__isnull=True)
        return json_response([x.to_dict(excludes=('access_token', 'password_hash')) for x in users])

    def post(self, request):
        form, error = JsonParser(
            Argument('username', help='请输入登录名'),
            Argument('password', help='请输入密码'),
            Argument('nickname', help='请输入姓名'),
        ).parse(request.body)
        if error is None:
            form.password_hash = User.make_password(form.pop('password'))
            form.created_by = request.user
            User.objects.create(**form)
        return json_response(error=error)

    def patch(self, request):
        form, error = JsonParser(
            Argument('id', type=int, help='请指定操作对象'),
            Argument('username', required=False),
            Argument('password', required=False),
            Argument('nickname', required=False),
            Argument('is_active', type=bool, required=False),
        ).parse(request.body, True)
        if error is None:
            if form.get('password'):
                form.password_hash = User.make_password(form.pop('password'))
            User.objects.filter(pk=form.pop('id')).update(**form)
        return json_response(error=error)

    def delete(self, request):
        form, error = JsonParser(
            Argument('id', type=int, help='请指定操作对象')
        ).parse(request.GET)
        if error is None:
            User.objects.filter(pk=form.id).update(
                deleted_at=human_time(),
                deleted_by=request.user
            )
        return json_response(error=error)


def login(request):
    form, error = JsonParser(
        Argument('username', help='请输入用户名'),
        Argument('password', help='请输入密码')
    ).parse(request.body)
    if error is None:
        user = User.objects.filter(username=form.username).first()
        if user:
            if not user.is_active:
                return json_response(error="账户已被禁用")
            if user.verify_password(form.password):
                cache.delete(form.username)
                token_isvalid = user.access_token and len(user.access_token) == 32 and user.token_expired >= time.time()
                user.access_token = user.access_token if token_isvalid else uuid.uuid4().hex
                user.token_expired = time.time() + 8 * 60 * 60
                user.last_login = human_time()
                user.save()
                return json_response({'access_token': user.access_token, 'nickname': user.nickname})

        value = cache.get_or_set(form.username, 0, 86400)
        if value >= 3:
            if user and user.is_active:
                user.is_active = False
                user.save()
            return json_response(error='账户已被禁用')
        cache.set(form.username, value + 1, 86400)
        return json_response(error="用户名或密码错误，连续多次错误账户将会被禁用")
    return json_response(error=error)


def logout(request):
    request.user.token_expired = 0
    request.user.save()
    return json_response()