from django.db.models import Q
from rest_framework.pagination import PageNumberPagination
from django.contrib.auth.decorators import login_required
from django.utils.decorators import method_decorator
from django.core.files.base import ContentFile
from rest_framework.decorators import api_view, permission_classes
import base64
from cmath import inf
import csv
import importlib.util
import io
import os
import re
import subprocess
import tempfile
from django.http import FileResponse, HttpResponse
from django.shortcuts import render
from time import sleep
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status
from django.template.loader import get_template
import sympy

from .filters import ExosFilter

from .paginations import CustomPagination

from .pdfmaker import pdf_settings

from .models import generate_unique_code_step

from .utils import TexError, checkExoModelObject

import requests

from api.Generateur import Csv_generator, Generateur

from .models import Exercice, Tag
from .serializers import ExerciceCreateSerializer, ExerciceSerializer, TagSerializer
from users.serializers import UserSerializer

from rest_framework import permissions
# Create your views here.


class ExerciceAPI(APIView):
    pagination_class = CustomPagination

    def get(self, request, format=None):
        steps = Exercice.objects.filter(private=False)
        userExos = []
        if request.user.is_authenticated:
            steps = [s for s in steps if s.author.id != request.user.id]
            userExos = request.user.exercice_set.all()

        code = request.GET.get('id')

        if code == 'pdf':
            stepsListSorted = [s for s in steps if s.isPdf == True]
            userExosListSorted = [s for s in userExos if s.isPdf == True]
        elif code == 'web':
            stepsListSorted = [s for s in steps if s.isWeb == True]
            userExosListSorted = [s for s in userExos if s.isWeb == True]
        if code == 'all':
            stepsListSorted = steps
            userExosListSorted = userExos
        else:
            stepsListSorted = steps
            userExosListSorted = userExos

        if code != 'all' and code != 'pdf' and code != "web":
            try:
                exo = Exercice.objects.get(id_code=code)
            except:
                exo = None
                return Response({'error': "Not found"}, status= status.HTTP_404_NOT_FOUND)
            isUser = False
            if request.user == exo.author:
                isUser = True
            return Response({"data": {**ExerciceSerializer(exo).data, "isUser": isUser, "original": exo.origin.id_code if exo.origin != None else None, "author": UserSerializer(exo.author).data if exo.author != None else None, 'exo_model': {'filename': exo.exo_model.name.split('/')[-1], "data": open(exo.exo_model.name, 'r').read()},  "tags": [{**TagSerializer(t).data, 'value': t.id_code, 'label': t.name} for t in [tt for tt in exo.tags.all() if tt.user == request.user]]}}, status=status.HTTP_200_OK)
        
        else:
            return Response({"data": {
                "userExos": [{**ExerciceSerializer(ex).data, 'isUser': True, "original": ex.origin.id_code if ex.origin != None else None, "author": UserSerializer(ex.author).data if ex.author != None else None, "exo_model": {"filename": ex.exo_model.name.split('/')[-1], "data":  open(
                    ex.exo_model.name, 'r').read()}, "tags": [{**TagSerializer(t).data, 'value': t.id_code, 'label': t.name} for t in ex.tags.all()]} for ex in userExosListSorted],
                "publicList": [{**ExerciceSerializer(ex).data, 'isUser': False, 'isRegistered': len(request.user.registeredExos.filter(id_code=ex.id_code)) != 0 if request.user.is_authenticated else None, "author": UserSerializer(ex.author).data if ex.author != None else None, "exo_model": {"filename": ex.exo_model.name.split('/')[-1], "data":  open(
                    ex.exo_model.name, 'r').read()}, "original": ex.origin.id_code if ex.origin != None else None,
                    "tags": [{**TagSerializer(t).data, 'value': t.id_code, 'label': t.name} for t in [tt for tt in ex.tags.all() if tt.user == request.user]]} for ex in stepsListSorted],
            }}, status=status.HTTP_200_OK)

    def post(self, request, format=None):
        file = request.FILES['file']
        name = request.data.get('name')
        private = request.data.get('private')
        consigne = request.data.get('consigne')
        create_serializer = ExerciceCreateSerializer(
            data={'exo_model': file, "consigne": consigne, "name": name, 'private': private}, context={'request': request})
        if create_serializer.is_valid():
            author = request.user if request.user.is_authenticated else None
            new_exo = Exercice(consigne=consigne,
                               exo_model=create_serializer.validated_data['exo_model']['file'], name=name, author=author, private=create_serializer.validated_data['private'])
            # Generateur(exo_model, 5)

            new_exo.isPdf = create_serializer.validated_data['exo_model']['isPdf']
            new_exo.isCsv = create_serializer.validated_data['exo_model']['isCsv']
            new_exo.isWeb = create_serializer.validated_data['exo_model']['isWeb']
            new_exo.save()
            new_exo.exemple = {
                # f'{"Csv" if new_exo.isCsv == True else ""}{"Web" if new_exo.isWeb == True else ""}',
                'type': 'Csv' if new_exo.isCsv == True else 'Web' if new_exo.isWeb == True else None,
                'data': Generateur(new_exo.exo_model.name, 5, 'csv' if new_exo.isCsv == True else 'web' if new_exo.isWeb == True else None, True) if new_exo.isCsv == True or new_exo.isWeb == True else None
            }
            new_exo.save()
            # sleep(2)

            return Response({"status": "200", "errors": {}, "data": {**ExerciceSerializer(new_exo).data, "author": UserSerializer(new_exo.author).data if new_exo.author != None else None, 'exo_model': {'filename': new_exo.exo_model.name.split('/')[-1], "data": open(new_exo.exo_model.name, 'r').read()},  "tags": [{**TagSerializer(t).data, 'value': t.id_code, 'label': t.name} for t in new_exo.tags.all()]}}, status=status.HTTP_200_OK)
        
        return Response({"status": "400", "errors": create_serializer.errors}, status=status.HTTP_400_BAD_REQUEST)

    @method_decorator(login_required)
    def put(self, request, format=None):
        file = request.FILES['file']
        name = request.data.get('name')
        consigne = request.data.get('consigne')
        id_code = request.data.get('id_code')
        private = request.data.get('private')

        exo = Exercice.objects.filter(id_code=id_code)
        if len(exo) == 0:
            return Response({'status': "404", "data": {}},
                            status=status.HTTP_404_NOT_FOUND)
        exo = exo[0]
        if request.user != exo.author:
            return Response({'status': "401", "data": {}},
                            status=status.HTTP_401_UNAUTHORIZED)

        serializer = ExerciceCreateSerializer(
            data={'exo_model': file, "consigne": consigne, "name": name, "private": private})
        errors = []

        if serializer.is_valid():
            exo.name = name
            exo.consigne = consigne
            exo.exo_model = serializer.validated_data['exo_model']['file']
            exo.private = serializer.validated_data['private']

            exo.isPdf = serializer.validated_data['exo_model']['isPdf']
            exo.isCsv = serializer.validated_data['exo_model']['isCsv']
            exo.isWeb = serializer.validated_data['exo_model']['isWeb']
            exo.save()
            exo.exemple = {
                # f'{"Csv" if new_exo.isCsv == True else ""}{"Web" if new_exo.isWeb == True else ""}',
                'type': 'Csv' if exo.isCsv == True else 'Web' if exo.isWeb == True else None,
                'data': Generateur(exo.exo_model.name, 5, 'csv' if exo.isCsv == True else 'web' if exo.isWeb == True else None, True) if exo.isCsv == True or exo.isWeb == True else None
            }
            exo.save()

            return Response({"status": "200", "errors": {}, "data": ExerciceSerializer(exo).data}, status=status.HTTP_200_OK)
        return Response({"status": "400", "errors": serializer.errors}, status=status.HTTP_400_BAD_REQUEST)

    @method_decorator(login_required)
    def delete(self, request, format=None):

        id_code = request.data.get('id_code')
        exo = Exercice.objects.filter(id_code=id_code)
        if len(exo) == 0:
            return Response({'status': "404", "data": {}},
                            status=status.HTTP_404_NOT_FOUND)
        exo = exo[0]
        if request.user != exo.author:
            return Response({'status': "401", "data": {}},
                            status=status.HTTP_401_UNAUTHORIZED)

        exo.delete()

        return Response({'status': "200", "data": id_code}, status=status.HTTP_200_OK)


@api_view(['GET'])
def getPublicList(request):
    ''' paginator = PageNumberPagination()
    paginator.page_size = 10
    person_objects = Exercice.objects.all()
    result_page = paginator.paginate_queryset(person_objects, request) '''
    #exos = Exercice.objects.all()
    # return Response({'data': ExerciceSerializer(exos[8], context={'user_id': request.user.id_code if not request.user.is_anonymous else ''}).data}, status=status.HTTP_200_OK)

    paginator = CustomPagination()
    paginator.page_size = 22

    exos = Exercice.objects.filter(private=False).filter(original=True)

    if not request.user.is_anonymous:
        # [ex for ex in exos if ex.author.id != request.user.id]
        exos = exos.filter(~Q(author__id=request.user.id))

    code = request.query_params.get('code')

    if code == 'pdf':
        exos = exos.filter(isPdf=True)  # [s for s in exos if s.isPdf == True]
    elif code == 'web':
        exos = exos.filter(isWeb=True)  # [s for s in exos if s.isWeb == True]
    elif code == 'csv':
        exos = exos.filter(isCsv=True)  # [s for s in exos if s.isCsv == True]
    exos = ExosFilter(request=request.GET, queryset=exos).qs
    
    result_page = paginator.paginate_queryset(
        exos.order_by('-last_update'), request)
    serializer = ExerciceSerializer(result_page, many=True, context={
                                    'user_id': request.user.id_code if not request.user.is_anonymous else ''})
    return paginator.get_paginated_response(serializer.data)


@api_view(['GET'])
@permission_classes([permissions.IsAuthenticated])
def getUserExosList(request):
    paginator = CustomPagination()
    paginator.page_size = 22

    # Exercice.objects.filter(private=False).filter(original=True)
    exos = request.user.exercice_set.all()
    code = request.query_params.get('code')

    if code == 'pdf':
        exos = exos.filter(isPdf=True)  # [s for s in exos if s.isPdf == True]
    elif code == 'web':
        exos = exos.filter(isWeb=True)  # [s for s in exos if s.isWeb == True]
    elif code == 'csv':
        exos = exos.filter(isCsv=True)  # [s for s in exos if s.isCsv == True]
    exos = ExosFilter(request=request.GET, queryset=exos).qs
    result_page = paginator.paginate_queryset(
        exos.order_by('-last_update'), request)
    serializer = ExerciceSerializer(result_page, many=True, context={
                                    'user_id': request.user.id_code if not request.user.is_anonymous else ''})
    return paginator.get_paginated_response(serializer.data)


@api_view(['GET'])
def getExoModelFile(request):

    id_code = request.query_params['id_code']
    exo = Exercice.objects.filter(id_code=id_code)
    if len(exo) == 0:
        return Response({'errors': 'Not found'}, status=status.HTTP_404_NOT_FOUND)
    exo = exo[0]
    model = exo.exo_model
    
    with open(model.name, 'r') as f:

        response = HttpResponse(f.read(), content_type='text/x-python')
        response['Content-Disposition'] = f'attachment;filename={model.name.split("/")[-1]}'
        return response


@api_view(['POST'])
@permission_classes([permissions.IsAuthenticated])
def fav(request):
    code = request.data.get('code')
    exo = Exercice.objects.filter(id_code=code)
    if len(exo) == 0:
        return Response({'data': {'msg': 'Not found'}}, status=status.HTTP_404_NOT_FOUND)
    originExo = exo[0]
    exo = exo[0]
    with open(exo.exo_model.path, 'r') as f:
        
        exo.pk = None
        exo.id = None
        exo.id_code = generate_unique_code_step()
        exo.author = request.user
        exo.original = False
        exo.origin = Exercice.objects.filter(id_code=code)[0]
        exo.exo_model.save(f.name.split('/')[-1], ContentFile(f.read()))
        exo._state.adding = True
        exo.save()

    return Response({'data': {'isRegistered': False}}, status=status.HTTP_200_OK)


class TagsAPI(APIView):
    @method_decorator(login_required)
    def get(self, request, format=None):
        tags = request.user.tag_set.all()
        return Response({"data": list(map(lambda tag: {**TagSerializer(tag).data, 'label': tag.name, "value": tag.id_code}, tags))}, status=status.HTTP_200_OK)

    @method_decorator(login_required)
    def post(self, request, format=None):
        options = request.data.get('tags')
        id_code = request.data.get('step')
        exo = Exercice.objects.filter(id_code=id_code)
        if len(exo) == 0:
            return Response({'status': "404", "data": {}},
                            status=status.HTTP_404_NOT_FOUND)
        exo = exo[0]
        tagsList = []

        for o in options:
            # 
            if o['value'].startswith('new_opt'):
                newTag = Tag(name=o['label'],
                             color=o['color'], user=request.user)
                newTag.save()
                exo.tags.add(newTag)
                exo.save()
                tagsList.append(
                    {'name': o['label'], 'color': o['color'], 'id_code': newTag.id_code})
            else:
                tagId = o['value']
                tag = request.user.tag_set.filter(id_code=tagId)
                if len(tag) == 0:
                    return Response({'errors': ''}, status=status.HTTP_400_BAD_REQUEST)
                tag = tag[0]
                exo.tags.add(tag)
                exo.save()
                tagsList.append(
                    {'name': o['label'], 'color': o['color'], 'id_code': tag.id_code})
        return Response({'id_code': exo.id_code, 'tags': [{**TagSerializer(t).data, 'value': t.id_code, 'label': t.name} for t in exo.tags.all() if t.user == request.user]}, status=status.HTTP_200_OK)

    @method_decorator(login_required)
    def delete(self, request, format=None):
        tagId = request.data.get('tag')
        id_code = request.data.get('step')
        exo = Exercice.objects.filter(id_code=id_code)
        if len(exo) == 0:
            return Response({'status': "404", "data": {}},
                            status=status.HTTP_404_NOT_FOUND)
        tag = request.user.tag_set.filter(id_code=tagId)
        if len(tag) == 0:
            return Response({'errors': ''}, status=status.HTTP_400_BAD_REQUEST)
        tag = tag[0]
        exo = exo[0]
        if request.user != exo.author:
            if tag.user != request.user:
                return Response({'status': "401", "data": {}},
                                status=status.HTTP_401_UNAUTHORIZED)

        exo.tags.remove(tag)
        exo.save()
        return Response({'id_code': exo.id_code, 'name': tag.name, 'tagId': tag.id_code, 'tags': [{**TagSerializer(t).data, 'value': t.id_code, 'label': t.name} for t in exo.tags.all() if t.user == request.user]}, status=status.HTTP_200_OK)


class Editor(APIView):
    def post(self, request, format=None):
        code = request.data.get('code')

        if code == None:
            return Response([''], status=status.HTTP_200_OK)

        with tempfile.TemporaryDirectory() as tempdir:
            with open(os.path.join(tempdir, "tmp.py"), 'w') as script:
                script.write(code)
            proc = subprocess.Popen(['python3.10', 'tmp.py', ],
                                    stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=tempdir)
            
            out, err = proc.communicate()
            out = out.decode().splitlines()
            return Response({"out": out, "error": err.decode('utf-8').splitlines()}, status=status.HTTP_200_OK)


class CSV_Generator(APIView):
    def get(self, request, code, format=None):

        ex = Exercice.objects.filter(id_code=code)[0]
        if ex.isCsv == False:
            return Response({'error': "Bah non en fait"}, status=status.HTTP_401_UNAUTHORIZED)

        model = ex.exo_model.name
        consigne = ex.consigne

        response = HttpResponse(content_type='text/csv')
        response['Content-Disposition'] = 'attachment;filename="test.csv"'
        writer = csv.writer(response, delimiter=',',
                            quotechar=',', quoting=csv.QUOTE_MINIMAL, dialect='excel')  # mettre | comme sep un jour

        Csv_generator(model, 10, 10, 10,
                      consigne, writer)

        return response


@api_view(['POST'])
def pdfGen(request):
    
    exos = [pdf_settings(Exercice.objects.get(id_code=ex['id_code']).exo_model.name, int(ex['numberInExo']), Exercice.objects.get(id_code=ex['id_code']).consigne)
            for ex in request.data.get('exos')]
   
    for e in range(len(exos)):
        for exo in range(len(exos[e]['exos'])):
            # 

            exos[e]['exos'][exo]['calcul'] = sympy.latex(
                exos[e]['exos'][exo]['calcul'])

            exos[e]['exos'][exo]['calcul'] = exos[e]['exos'][exo]['calcul'].replace(
                '≃', '\\ensuremath{\\simeq}')
            exos[e]['exos'][exo]['calcul'] = exos[e]['exos'][exo]['calcul'].replace(
                '≈', '\\ensurmath{\approx}')
            exos[e]['exos'][exo]['calcul'] = exos[e]['exos'][exo]['calcul'].replace(
                '≠', '\\ensuremath{\neq}')

            exos[e]['exos'][exo]['correction'] = sympy.latex(
                exos[e]['exos'][exo]['correction'])

            exos[e]['exos'][exo]['correction'] = exos[e]['exos'][exo]['correction'].replace(
                '≃', '\\ensuremath{\\simeq}')
            exos[e]['exos'][exo]['correction'] = exos[e]['exos'][exo]['correction'].replace(
                '≈', '\\ensurmath{\approx}')
            exos[e]['exos'][exo]['correction'] = exos[e]['exos'][exo]['correction'].replace(
                '≠', '\\ensuremath{\neq}')

            exp_list = re.findall(
                r'\[([A-Za-z0-9_]+)\]', exos[e]['exos'][exo]['correction'])
            red = '{red}'
            for exp in exp_list:
                exos[e]['exos'][exo]['correction'] = exos[e]['exos'][exo]['correction'].replace(
                    f'[{exp}]', f'\\textcolor{red}{{{exp}}}')
    context = {'exos': exos, 'title': request.data.get(
            'title'), 'police': request.data.get('police')}

    template = get_template('test.tex')
    latex = template.render(context)
    
    with tempfile.TemporaryDirectory() as tempdir:
        direct = tempdir
        with open(os.path.join(direct, 'tmp.tex'), 'x', encoding='utf-8') as f:
            f.write(latex)
        command = f'xelatex -interaction=batchmode tmp.tex'
        try:
            subprocess.run(command, shell=True,
                            stdout=subprocess.PIPE,
                            stderr=subprocess.PIPE,
                            check=True,
                            cwd=direct)
        except TexError:
            raise TexError(log=log, source=latex,
                            template_name='test.tex')
        try:
            subprocess.run(command, shell=True,
                            stdout=subprocess.PIPE,
                            stderr=subprocess.PIPE,
                            check=True,
                            cwd=direct)
        except TexError:
            raise TexError(log=log, source=latex,
                            template_name='test.tex')

        with open(os.path.join(direct, 'tmp.pdf'), 'rb') as out:

            pdf = out.read()
            buffer = io.BytesIO(out.read())
        fich_name = request.data.get('file')
        if fich_name.count('.') >= 1:
            ext = fich_name.split('.')[-1]
            # 
            if ext == 'pdf':
                fich_name = fich_name
            elif ext != 'pdf':
                # 
                fich_name = fich_name.replace(f'.{ext}', '.pdf')
        else:
            fich_name = fich_name + '.pdf'
        return Response({'pdf': base64.b64encode(pdf), 'filename': fich_name}, status=status.HTTP_200_OK)


class PDF(APIView):
    def post(self, request, format=None):
        exos = list(map(lambda ex: pdf_settings(
            Exercice.objects.filter(id_code=ex['id_code'])[0].exo_model.name, 14, int(ex['numberInExo']), int(ex['numberOfExo']), 1, ex['consigne']), request.data.get('exos')))

        # 
        # dans str mettre space(0.5) replace by \hspace{0.5cm}
        template_name = 'test.tex'
        symbols = {
            "≈": "\\approx",
            '≠': '\\neq',
            "≃": "\\simeq"
        }

        # a refaire pour supp les symbols
        for e in range(len(exos)):
            for exo in range(len(exos[e]['exos'])):
                # 

                exos[e]['exos'][exo]['calcul'] = sympy.latex(
                    exos[e]['exos'][exo]['calcul'])

                exos[e]['exos'][exo]['calcul'] = exos[e]['exos'][exo]['calcul'].replace(
                    '≃', '\\ensuremath{\\simeq}')
                exos[e]['exos'][exo]['calcul'] = exos[e]['exos'][exo]['calcul'].replace(
                    '≈', '\\ensurmath{\approx}')
                exos[e]['exos'][exo]['calcul'] = exos[e]['exos'][exo]['calcul'].replace(
                    '≠', '\\ensuremath{\neq}')

                exos[e]['exos'][exo]['correction'] = sympy.latex(
                    exos[e]['exos'][exo]['correction'])

                exos[e]['exos'][exo]['correction'] = exos[e]['exos'][exo]['correction'].replace(
                    '≃', '\\ensuremath{\\simeq}')
                exos[e]['exos'][exo]['correction'] = exos[e]['exos'][exo]['correction'].replace(
                    '≈', '\\ensurmath{\approx}')
                exos[e]['exos'][exo]['correction'] = exos[e]['exos'][exo]['correction'].replace(
                    '≠', '\\ensuremath{\neq}')

                exp_list = re.findall(
                    r'\[([A-Za-z0-9_]+)\]', exos[e]['exos'][exo]['correction'])
                red = '{red}'
                for exp in exp_list:
                    exos[e]['exos'][exo]['correction'] = exos[e]['exos'][exo]['correction'].replace(
                        f'[{exp}]', f'\\textcolor{red}{{{exp}}}')

        context = {'exos': exos, 'title': request.data.get(
            'title'), 'police': request.data.get('police')}

        template = get_template('test.tex')
        latex = template.render(context)  # latex to compile
       # 
        with tempfile.TemporaryDirectory() as tempdir:
            direct = tempdir
            with open(os.path.join(direct, 'tmp.tex'), 'x', encoding='utf-8') as f:
                f.write(latex)
            command = f'xelatex -interaction=batchmode tmp.tex'
            try:
                subprocess.run(command, shell=True,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE,
                               check=True,
                               cwd=direct)
            except TexError:
                raise TexError(log=log, source=latex,
                               template_name='test.tex')
            try:
                subprocess.run(command, shell=True,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE,
                               check=True,
                               cwd=direct)
            except TexError:
                raise TexError(log=log, source=latex,
                               template_name='test.tex')

            with open(os.path.join(direct, 'tmp.pdf'), 'rb') as out:

                pdf = out.read()
                buffer = io.BytesIO(out.read())
            fich_name = request.data.get('file')
            if fich_name.count('.') >= 1:
                ext = fich_name.split('.')[-1]
                # 
                if ext == 'pdf':
                    fich_name = fich_name
                elif ext != 'pdf':
                    # 
                    fich_name = fich_name.replace(f'.{ext}', '.pdf')
            else:
                fich_name = fich_name + '.pdf'
            return Response({'pdf': base64.b64encode(pdf), 'filename': fich_name}, status=status.HTTP_200_OK)
            ''' return PDFResponse(base64.b64encode(pdf), filename=fich_name)
            subprocess.run('ls', cwd=direct)
 '''


class Test(APIView):
    def get(self, request, format=None):
        code = "VZRKLZ"
        ex = Exercice.objects.filter(id_code=code)[0]
        model = ex.exo_model
        
        oplist = Generateur(model.name, 2, 'calcul')
        return Response({"data": oplist}, status=status.HTTP_200_OK)


class ExoModelApi(APIView):
    def get(self, request, format=None):
        code = request.GET.get('id_code')
        exo = Exercice.objects.filter(id_code=code)[0]
        
        model = open(exo.exo_model.name, 'rb')
        return FileResponse(model, status=status.HTTP_200_OK)