from datetime import datetime
import random
from django.db.models import Q, Count
from account.models import User
from submission.models import Submission, JudgeStatus
from utils.api import APIView
from account.decorators import check_contest_permission
from ..models import ProblemTag, Problem, ProblemRuleType
from ..serializers import (
    ProblemSerializer,
    TagSerializer,
    ProblemSafeSerializer,
    ProblemListSerializer,
)
from contest.models import ContestRuleType


class ProblemTagAPI(APIView):
    def get(self, request):
        qs = ProblemTag.objects
        keyword = request.GET.get("keyword")
        if keyword:
            qs = ProblemTag.objects.filter(name__icontains=keyword)
        tags = qs.annotate(problem_count=Count("problem")).filter(problem_count__gt=0)
        return self.success(TagSerializer(tags, many=True).data)


class PickOneAPI(APIView):
    def get(self, request):
        problems = Problem.objects.filter(contest_id__isnull=True, visible=True)
        count = problems.count()
        if count == 0:
            return self.error("No problem to pick")
        return self.success(problems[random.randint(0, count - 1)]._id)


class ProblemAPI(APIView):
    @staticmethod
    def _add_problem_status(request, queryset_values):
        if request.user.is_authenticated:
            profile = request.user.userprofile
            acm_problems_status = profile.acm_problems_status.get("problems", {})
            oi_problems_status = profile.oi_problems_status.get("problems", {})
            # paginate data
            results = queryset_values.get("results")
            if results is not None:
                problems = results
            else:
                problems = [
                    queryset_values,
                ]
            for problem in problems:
                if problem["rule_type"] == ProblemRuleType.ACM:
                    problem["my_status"] = acm_problems_status.get(
                        str(problem["id"]), {}
                    ).get("status")
                else:
                    problem["my_status"] = oi_problems_status.get(
                        str(problem["id"]), {}
                    ).get("status")

    def get(self, request):
        # 问题详情页
        problem_id = request.GET.get("problem_id")
        if problem_id:
            try:
                problem = Problem.objects.select_related("created_by").get(
                    _id=problem_id, contest_id__isnull=True, visible=True
                )
                problem_data = ProblemSerializer(problem).data
                self._add_problem_status(request, problem_data)
                return self.success(problem_data)
            except Problem.DoesNotExist:
                return self.error("Problem does not exist")

        limit = request.GET.get("limit")
        if not limit:
            return self.error("Limit is needed")

        problems = (
            Problem.objects.select_related("created_by")
            .filter(contest_id__isnull=True, visible=True)
            .order_by("-create_time")
        )
        # 按照标签筛选
        tag_text = request.GET.get("tag")
        if tag_text:
            problems = problems.filter(tags__name=tag_text)

        # 搜索的情况
        keyword = request.GET.get("keyword", "").strip()
        if keyword:
            problems = problems.filter(
                Q(title__icontains=keyword) | Q(_id__icontains=keyword)
            )

        # 难度筛选
        difficulty = request.GET.get("difficulty")
        if difficulty:
            problems = problems.filter(difficulty=difficulty)
        # 根据profile 为做过的题目添加标记
        data = self.paginate_data(request, problems, ProblemListSerializer)
        self._add_problem_status(request, data)
        return self.success(data)


class ContestProblemAPI(APIView):
    def _add_problem_status(self, request, queryset_values):
        if request.user.is_authenticated:
            profile = request.user.userprofile
            if self.contest.rule_type == ContestRuleType.ACM:
                problems_status = profile.acm_problems_status.get(
                    "contest_problems", {}
                )
            else:
                problems_status = profile.oi_problems_status.get("contest_problems", {})
            for problem in queryset_values:
                problem["my_status"] = problems_status.get(str(problem["id"]), {}).get(
                    "status"
                )

    @check_contest_permission(check_type="problems")
    def get(self, request):
        problem_id = request.GET.get("problem_id")
        if problem_id:
            try:
                problem = Problem.objects.select_related("created_by").get(
                    _id=problem_id, contest=self.contest, visible=True
                )
            except Problem.DoesNotExist:
                return self.error("Problem does not exist.")
            if self.contest.problem_details_permission(request.user):
                problem_data = ProblemSerializer(problem).data
                self._add_problem_status(
                    request,
                    [
                        problem_data,
                    ],
                )
            else:
                problem_data = ProblemSafeSerializer(problem).data
            return self.success(problem_data)

        contest_problems = Problem.objects.select_related("created_by").filter(
            contest=self.contest, visible=True
        )
        if self.contest.problem_details_permission(request.user):
            data = ProblemListSerializer(contest_problems, many=True).data
            self._add_problem_status(request, data)
        else:
            data = ProblemSafeSerializer(contest_problems, many=True).data
        return self.success(data)


class ProblemSolvedPeopleCount(APIView):
    def get(self, request):
        problem_id = request.GET.get("problem_id")
        if not request.user.is_authenticated:
            return self.success("0%")
        submission_count = Submission.objects.filter(
            user_id=request.user.id,
            problem_id=problem_id,
            result=JudgeStatus.ACCEPTED,
        ).count()
        if submission_count == 0:
            return self.success("0%")
        today = datetime.today()
        total_count = Submission.objects.filter(
            create_time__gte=datetime(today.year - 1, today.month, today.day, 0, 0)
        ).aggregate(user_count=Count("user_id", distinct=True))["user_count"]
        accepted_count = Submission.objects.filter(
            problem_id=problem_id, result=JudgeStatus.ACCEPTED
        ).aggregate(user_count=Count("user_id", distinct=True))["user_count"]
        if accepted_count < total_count:
            rate = "%.2f" % ((total_count - accepted_count) / total_count * 100)
        else:
            rate = "0"
        return self.success(f"{rate}%")