"""
surveys.py

This module is used to write views related to the survey features
"""

import json
from datetime import datetime
from uuid import uuid4

from django.contrib import messages
from django.core import serializers
from django.core.files.storage import default_storage
from django.core.files.uploadedfile import SimpleUploadedFile
from django.db.models import ProtectedError
from django.http import HttpResponse, HttpResponseRedirect, JsonResponse
from django.shortcuts import redirect, render
from django.utils.translation import gettext_lazy as _

from base.methods import closest_numbers, get_pagination
from horilla.decorators import (
    hx_request_required,
    is_recruitment_manager,
    login_required,
    permission_required,
)
from recruitment.filters import SurveyFilter
from recruitment.forms import (
    AddQuestionForm,
    ApplicationForm,
    QuestionForm,
    SurveyForm,
    SurveyPreviewForm,
    TemplateForm,
)
from recruitment.models import (
    Candidate,
    JobPosition,
    Recruitment,
    RecruitmentSurvey,
    RecruitmentSurveyAnswer,
    Resume,
    Stage,
    SurveyTemplate,
)
from recruitment.pipeline_grouper import group_by_queryset
from recruitment.views.paginator_qry import paginator_qry


def survey_form(request):
    """
    This method is used to render survey wform
    """
    recruitment_id = request.GET["recId"]
    recruitment = Recruitment.objects.get(id=recruitment_id)
    form = SurveyForm(recruitment=recruitment).form
    return render(request, "survey/form.html", {"form": form})


def survey_preview(request, title):
    """
    Used to render survey form to the candidate
    """
    # title = request.GET.get("title")
    template = SurveyTemplate.objects.get(title=str(title))

    form = SurveyPreviewForm(template=template).form
    return render(
        request,
        "survey/survey_preview.html",
        {"form": form, "template": template},
    )


from django.views.decorators.csrf import csrf_exempt


@csrf_exempt
def question_order_update(request):
    if request.method == "POST":
        # Extract data from the request
        question_id = request.POST.get("question_id")
        new_position = int(request.POST.get("new_position"))
        qs = RecruitmentSurvey.objects.get(id=question_id)

        if qs.sequence > new_position:
            new_position = new_position
        if qs.sequence <= new_position:
            new_position = new_position - 1

        old_qs = RecruitmentSurvey.objects.filter(sequence=new_position)
        for i in old_qs:

            i.sequence = new_position + 1
            i.save()
        qs.sequence = int(new_position)
        qs.save()
        return JsonResponse(
            {"success": True, "message": "Question order updated successfully"}
        )

    return JsonResponse({"error": "Invalid request method"}, status=405)


def candidate_survey(request):
    """
    Used to render survey form to the candidate
    """
    MAX_FILE_SIZE = 5 * 1024 * 1024  # 5 MB in bytes
    candidate_json = request.session["candidate"]
    candidate_dict = json.loads(candidate_json)
    rec_id = candidate_dict[0]["fields"]["recruitment_id"]
    job_id = candidate_dict[0]["fields"]["job_position_id"]
    job = JobPosition.objects.get(id=job_id)
    recruitment = Recruitment.objects.get(id=rec_id)
    stage_id = candidate_dict[0]["fields"]["stage_id"]
    candidate_dict[0]["fields"]["recruitment_id"] = recruitment
    candidate_dict[0]["fields"]["job_position_id"] = job
    candidate_dict[0]["fields"]["stage_id"] = Stage.objects.get(id=stage_id)
    candidate = Candidate(**candidate_dict[0]["fields"])
    form = SurveyForm(recruitment=recruitment).form
    if request.method == "POST":
        if not Candidate.objects.filter(
            email=candidate.email, recruitment_id=candidate.recruitment_id
        ).exists():
            candidate.save()
        else:
            candidate = Candidate.objects.filter(
                email=candidate.email, recruitment_id=candidate.recruitment_id
            ).first()
        answer = (
            RecruitmentSurveyAnswer()
            if candidate.recruitmentsurveyanswer_set.first() is None
            else candidate.recruitmentsurveyanswer_set.first()
        )
        answer.candidate_id = candidate

        # Process the POST data to properly handle multiple values
        answer_data = {}
        for key, value in request.POST.items():
            if key.startswith("multiple_choices_"):
                parts = key.split("_", 2)
                question_text = parts[2]
                selected_choices = request.POST.getlist(key)
                answer_data[question_text] = selected_choices
            elif key.startswith("date_"):
                parts = key.split("_", 1)
                question_text = parts[1]
                selected_choices = request.POST.getlist(key)
                if selected_choices and selected_choices[0] != "":
                    formatted_dates = [
                        datetime.strptime(date, "%Y-%m-%d").strftime("%d-%m-%Y")
                        for date in selected_choices
                    ]
                    answer_data[question_text] = formatted_dates
            else:
                answer_data[key] = [value]
        for key, value in request.FILES.items():
            attachment = request.FILES[key]
            if attachment.size > MAX_FILE_SIZE:
                messages.error(
                    request, _("File size exceeds the limit. Maximum size is 5 MB")
                )
                return render(
                    request,
                    "survey/candidate_survey_form.html",
                    {"form": form, "candidate": candidate},
                )
            attachment_path = f"recruitment_attachment/{attachment.name}"
            with default_storage.open(attachment_path, "wb+") as destination:
                for chunk in attachment.chunks():
                    destination.write(chunk)
            answer.attachment = attachment_path
            answer_data[key] = [attachment_path]
        answer.answer_json = json.dumps(answer_data)
        answer.save()
        messages.success(request, _("Your answers are submitted."))
        return render(request, "candidate/success.html")
    return render(
        request,
        "survey/candidate_survey_form.html",
        {"form": form, "candidate": candidate},
    )


@login_required
@is_recruitment_manager(perm="recruitment.view_recruitmentsurvey")
def view_question_template(request):
    """
    This method is used to view the question template
    """
    recs = Recruitment.objects.all()
    ids = []
    for i in recs:
        for manager in i.recruitment_managers.all():
            if request.user.employee_get == manager:
                ids.append(i.id)
    if request.user.has_perm("view_recruitmentsurvey"):
        questions = RecruitmentSurvey.objects.all()
    else:
        questions = RecruitmentSurvey.objects.filter(recruitment_ids__in=ids)
    templates = group_by_queryset(
        questions.filter(template_id__isnull=False).distinct(),
        "template_id__title",
        page=request.GET.get("template_page"),
        page_name="template_page",
        records_per_page=get_pagination(),
    )
    all_template_object_list = []
    for template in templates:
        all_template_object_list.append(template)

    survey_templates = SurveyTemplate.objects.all()
    all_templates = survey_templates.values_list("title", flat=True)
    used_templates = questions.values_list("template_id__title", flat=True)

    unused_templates = list(set(all_templates) - set(used_templates))
    unused_groups = []
    for template_name in unused_templates:
        unused_groups.append(
            {
                "grouper": template_name,
                "list": [],
                "dynamic_name": "",
            }
        )
    all_template_object_list = all_template_object_list + unused_groups

    templates = paginator_qry(
        all_template_object_list, request.GET.get("template_page")
    )
    survey_templates = paginator_qry(
        survey_templates, request.GET.get("survey_template_page")
    )
    filter_obj = SurveyFilter()
    requests_ids = json.dumps(
        [
            instance.id
            for instance in paginator_qry(
                questions, request.GET.get("page")
            ).object_list
        ]
    )
    return render(
        request,
        "survey/view_question_templates.html",
        {
            "questions": paginator_qry(questions, request.GET.get("page")),
            "templates": templates,
            "survey_templates": survey_templates,
            "f": filter_obj,
            "requests_ids": requests_ids,
        },
    )


@login_required
@hx_request_required
@permission_required(perm="recruitment.change_recruitmentsurvey")
def update_question_template(request, survey_id):
    """
    This view method is used to update question template
    """
    instance = RecruitmentSurvey.objects.get(id=survey_id)
    form = QuestionForm(
        instance=instance,
    )
    if request.method == "POST":
        form = QuestionForm(request.POST, instance=instance)
        if form.is_valid():
            instance = form.save(commit=False)
            instance.save()
            instance.template_id.set(form.cleaned_data["template_id"])
            instance.recruitment_ids.set(form.recruitment)
            # instance.job_position_ids.set(form.job_positions)
            messages.success(request, _("New survey question updated."))
            return HttpResponse(
                render(
                    request, "survey/template_update_form.html", {"form": form}
                ).content.decode("utf-8")
                + "<script>location.reload();</script>"
            )
    return render(request, "survey/template_update_form.html", {"form": form})


@login_required
@hx_request_required
@permission_required(perm="recruitment.add_recruitmentsurvey")
def create_question_template(request):
    """
    This view method is used to create question template
    """
    form = QuestionForm()
    if request.method == "POST":
        form = QuestionForm(request.POST)
        if form.is_valid():
            instance = form.save(commit=False)
            instance.save()
            instance.recruitment_ids.set(form.recruitment)
            instance.template_id.set(form.cleaned_data["template_id"])
            # instance.job_position_ids.set(form.job_positions)
            messages.success(request, _("New survey question created."))
            return HttpResponse(
                render(
                    request, "survey/template_form.html", {"form": form}
                ).content.decode("utf-8")
                + "<script>location.reload();</script>"
            )
    return render(request, "survey/template_form.html", {"form": form})


@login_required
@permission_required(perm="recriutment.delete_recruitmentsurvey")
def delete_survey_question(request, survey_id):
    """
    This method is used to delete the survey instance
    """
    try:
        RecruitmentSurvey.objects.get(id=survey_id).delete()
        messages.success(request, _("Question was deleted successfully"))
    except RecruitmentSurvey.DoesNotExist:
        messages.error(request, _("Question not found."))
    except ProtectedError:
        messages.error(request, _("You cannot delete this question"))
    return redirect(view_question_template)


def application_form(request):
    """
    This method renders candidate form to create candidate
    """
    form = ApplicationForm()
    recruitment = None
    recruitment_id = request.GET.get("recruitmentId")
    resume_id = request.GET.get("resumeId")
    resume_obj = Resume.objects.filter(id=resume_id).first()

    if resume_obj:
        initial_data = {"resume": resume_obj.file.url if resume_obj else None}
        form = ApplicationForm(initial=initial_data)

    if recruitment_id is not None:
        recruitment = Recruitment.objects.filter(id=recruitment_id)
        if recruitment.exists():
            recruitment = recruitment.first()
    if request.POST:

        if "resume" not in request.FILES and resume_id:
            if resume_obj and resume_obj.file:
                file_content = resume_obj.file.read()
                pdf_file = SimpleUploadedFile(
                    resume_obj.file.name, file_content, content_type="application/pdf"
                )
                request.FILES["resume"] = pdf_file

        form = ApplicationForm(request.POST, request.FILES)
        if form.is_valid():
            candidate_obj = form.save(commit=False)
            recruitment_obj = candidate_obj.recruitment_id
            stages = recruitment_obj.stage_set.all()
            if stages.filter(stage_type="applied").exists():
                candidate_obj.stage_id = stages.filter(stage_type="applied").first()
            else:
                candidate_obj.stage_id = stages.order_by("sequence").first()
            messages.success(request, _("Application saved."))

            resume = request.FILES.get("resume")
            if resume:
                resume_path = f"recruitment/resume/{resume.name}"

                with default_storage.open(resume_path, "wb+") as destination:
                    for chunk in resume.chunks():
                        destination.write(chunk)

                candidate_obj.resume = resume_path
            try:
                profile = request.FILES["profile"] if request.FILES["profile"] else None
                profile_path = f"recruitment/profile/{candidate_obj.name.replace(' ', '_')}_{profile.name}_{uuid4()}"
                with default_storage.open(profile_path, "wb+") as destination:
                    for chunk in profile.chunks():
                        destination.write(chunk)
                candidate_obj.profile = profile_path
            except:
                pass
            request.session["candidate"] = serializers.serialize(
                "json", [candidate_obj]
            )
            if RecruitmentSurvey.objects.filter(
                recruitment_ids=recruitment_id
            ).exists():
                try:
                    employee = request.user.employee_get
                    if (
                        not request.user.has_perm("perms.recruitment.add_candidate")
                        or employee not in recruitment.recruitment_managers.all()
                        or not employee.stage_set.filter(recruitment_id=recruitment)
                    ):
                        return redirect(candidate_survey)
                except:
                    return redirect(candidate_survey)
            candidate_obj.save()

            if resume_obj:
                resume_obj.is_candidate = True
                resume_obj.save()

            return render(request, "candidate/success.html")
        form.fields["job_position_id"].queryset = (
            form.instance.recruitment_id.open_positions.all()
        )
    return render(
        request,
        "candidate/application_form.html",
        {"form": form, "recruitment": recruitment, "resume": resume_obj},
    )


@login_required
@hx_request_required
@is_recruitment_manager(perm="recruitment.view_recruitmentsurvey")
def single_survey(request, survey_id):
    """
    This view method is used to single view of question template
    """
    question = RecruitmentSurvey.objects.get(id=survey_id)
    requests_ids_json = request.GET.get("instances_ids")
    context = {"question": question}
    if requests_ids_json:
        requests_ids = json.loads(requests_ids_json)
        previous_id, next_id = closest_numbers(requests_ids, survey_id)
        context["previous"] = previous_id
        context["next"] = next_id
        context["requests_ids"] = requests_ids_json
    return render(request, "survey/view_single_template.html", context)


@login_required
@hx_request_required
@permission_required("recruitment.add_surveytemplate")
def create_template(request):
    """
    Create question template views
    """
    title = request.GET.get("title")
    instance = None
    if title:
        instance = SurveyTemplate.objects.filter(title=title).first()
    form = TemplateForm(instance=instance)
    if request.method == "POST":
        form = TemplateForm(request.POST, instance=instance)
        if form.is_valid():
            form.save()
            messages.success(request, "Template saved")
            return HttpResponse("<script>window.location.reload()</script>")
    return render(request, "survey/main_form.html", {"form": form})


@login_required
@permission_required("recruitment.delete_surveytemplate")
def delete_template(request):
    """
    This method is used to delete the survey template group
    """
    title = request.GET.get("title")
    SurveyTemplate.objects.filter(title=str(title)).delete()
    if title == "None":
        messages.info(request, "This template group cannot be deleted")
    else:
        messages.success(request, "Template group deleted")

    return HttpResponseRedirect(request.META.get("HTTP_REFERER", "/"))


@login_required
@hx_request_required
@permission_required("recruitment.change_surveytemplate")
def question_add(request):
    """
    This method is used to add survey question to the templates
    """
    template = None
    title = request.GET.get("title")
    if title:
        template = SurveyTemplate.objects.filter(title=title)

    form = AddQuestionForm(initial={"template_ids": template})
    if request.method == "POST":
        form = AddQuestionForm(request.POST)
        if form.is_valid():
            form.save()
            messages.success(request, "Question added")
            return HttpResponse("<script>window.location.reload()</script>")
    return render(request, "survey/add_form.html", {"form": form})
