from django.shortcuts import render
from django.http import HttpResponse, HttpResponseRedirect
from django.contrib.auth import authenticate, login, logout
from django.template.defaultfilters import register
from .forms import UploadFileForm
from .models import *
import os
from subprocess import Popen, PIPE, STDOUT, call
import shutil
from django.conf import settings
import time

@register.filter(name='dict_key')
def dict_key(d, k):
    return d[k]

def Index(request):
    if request.user.is_authenticated:
        user = User.objects.get(id = request.user.id)
    else:
        return HttpResponseRedirect('login/')
        
    if request.method == 'POST':
        p_id = request.POST.get('problem')
        problem = Problems.objects.get(id=p_id)
        resolved = Resolvs.objects.filter(Problem=problem, Status=1, User=user).last()
        if not problem or resolved:
            return HttpResponseRedirect('/')
            
        file = Resolvs(
            SrcFile = request.FILES['resolve'],
            User = user,
            Problem = problem,
            )
        file.save()
        file_ext =file.SrcFile.path[file.SrcFile.path.rindex('.')+1:]
        if file_ext in ['py','cpp']:
            #Запускаю проверку решения на корректность
            tests = Tests.objects.filter(Problem=problem)
            rt_dir = os.path.join(settings.TEMP_DIR,str(user.id))
            if not os.path.exists(rt_dir):
                os.mkdir(rt_dir)
            shutil.copy(file.SrcFile.path, rt_dir+'/resolv.'+file_ext)
            status = 1
            message = ''
            dt = 0
            test_num = 0
            for t in tests:
                test_num += 1
                stdout_data = ''
                stderr_data = ''
                
                with open(rt_dir+'/INPUT.TXT','w') as f:
                    f.write(t.Input)
                #Запускаем отдельный процесс для проверки задачи
                try:
                    startt = time.time()
                    if file_ext == 'py':
                        proc = Popen(['python',f'{rt_dir}\\resolv.py'], stdout=PIPE, stdin=PIPE, stderr=PIPE, text=True)
                        print(t.Input,f'{rt_dir}\\resolv.py')
                        stdout_data, stderr_data = proc.communicate(input=t.Input, timeout=20)
                        print(stdout_data, stderr_data)
                    elif file_ext == 'cpp':
                        if test_num == 1:
                            proc = call(f"g++ {rt_dir}/resolv.cpp",
                                          cwd=rt_dir,
                                          timeout=20,
                                          shell=True)
                        proc = call(f"{rt_dir}/a.out",
                                      cwd=rt_dir,
                                      timeout=problem.TimeLimit,
                                      shell=True)			
                    endt = time.time()
                    tm = endt - startt
                    dt = tm if dt < tm else dt
                except Exception as e:
                    print(e)
                    status = 3
                    message = f"Выбили по таймауту"
                    break
                #Проверяем корректность решения
                if os.path.exists(rt_dir+'/OUTPUT.TXT'):
                    with open(rt_dir+'/OUTPUT.TXT','r') as f:
                        st = f.read()
                        if st != t.Output:
                            status = 3
                            message=f'Решение не верно. Тест {test_num}.'
                            break
                else:
                    if stdout_data.strip() != t.Output:
                        status = 3
                        message=f'Решение не верно. Тест {test_num}.'
                        break
        else:
            status = 9
            message = "Неизвесный формат файла"
        
        #Записываем результат в БД
        file.Status = status
        file.Message = message
        file.Time = dt
        file.save()
    
    problems = Problems.objects.all()
    dr = {}
    dmessage = {}
    link = {}
    for p in problems:
        resolv = Resolvs.objects.filter(User=user, Problem=p).last()
        if resolv:
            if resolv.Status == 1:
                dr[p.id] = 1
                dmessage[p.id] = ''
                link[p.id] = resolv.SrcFile.url
            else:
                dr[p.id] = 0
                dmessage[p.id] = resolv.Message
        else:
            dr[p.id] = 0
            dmessage[p.id] = ''
    return render(request,'index.html',{'problems':problems,
                                        'user':user,
                                        'resolved':dr,
                                        'message':dmessage,
                                        'link':link,})
def Details(request,p_id):
    if request.user.is_authenticated:
        user = User.objects.get(id = request.user.id)
    else:
        return HttpResponseRedirect('login/')
    problem = Problems.objects.get(id=p_id)
    resolvs = Resolvs.objects.filter(Problem=problem, Status=1)
    res = []
    usrs = {}
    ext = {}
    for r in resolvs:
        res.append(r.id)
        usrs[r.id] = r.User.username
        ext[r.id] = os.path.splitext(r.SrcFile.name)[1][1:].upper()
    return render(request,'details.html',{
            'problem':problem,
            'user':user,
            'resolvs':res,
            'u_list':usrs,
            'ext':ext,
            })
    

def Login(request):
    if request.method == 'POST':
        username = request.POST.get('login')
        pwd = request.POST.get('password')
        user = authenticate(request,username=username, password=pwd)
        if user is not None:
            login(request, user)
            request.session['username'] = username
            request.session.save()
            return HttpResponseRedirect('/')
    return render(request, 'login.html')

def Logout(request):
    logout(request)
    return HttpResponseRedirect('/')
    
def Registration(request):
    if request.method == 'POST':
        name = request.POST.get('name')
        pwd = request.POST.get('password')
        email = request.POST.get('email')
        user = User.objects.filter(username = name).first()
        if user:
            print('Имя занято')
            return render(request,'register.html')
        user = User.objects.filter(email = email).first()
        if user:
            print('Email уже есть')
            return render(request,'register.html')
        user = User.objects.create_user(
                name,
                email,
                pwd,
                is_staff = True
                )
        return HttpResponseRedirect('/')
    return render(request,'register.html')