import datetime
from datetime import timedelta

from django.db.models import Sum, Q, QuerySet
from django.http import JsonResponse
from django.shortcuts import render, get_object_or_404, redirect
from django.views import generic
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_POST

from dispatcher.core import import_tasks
from dispatcher.forms import ProjectForm, ImportForm, ParentForm
from dispatcher.models import Project, Parent, Clocking, Task
from dispatcher.serializers import ClockingSerializer


def dashboard_view(request):
    context = {
        "projects": Project.objects.all(),
        "parents": Parent.objects.all()
    }
    return render(request, "dashboard.html", context)

def projects_view(request):
    context = {
        "class_name": "parent",
        "projects": Project.objects.all(),
        "parents": Parent.objects.all()
    }
    return render(request, "projects.html", context)


def parent_view(request, id):
    parent = get_object_or_404(Parent, id=id)

    if request.method == "DELETE":
        parent.delete()
        return JsonResponse({"status": "success"})

    context = {
        "class": "parent",
        "id": id
    }
    form = ParentForm(request.POST or None, request.FILES or None, instance=parent)
    if form.is_valid():
        form.save()
        return redirect("parents")
    context["form"] = ParentForm(instance=parent)
    return render(request, "edit.html", context)

def parent_on_delete_view(request, id):
    parent = get_object_or_404(Parent, id=id)
    projects = parent.project_set.count()
    tasks = Task.objects.filter(project__parent=parent).count()

    return JsonResponse({
        "status": "success",
        "projects": projects,
        "tasks": tasks
    })

def project_on_delete_view(request, id):
    project = get_object_or_404(Project, id=id)
    tasks = project.task_set.count()

    return JsonResponse({
        "status": "success",
        "tasks": tasks
    })

def new_parent_view(request):
    context = {
        "class": "parent"
    }
    form = ParentForm(request.POST or None, request.FILES or None)
    if form.is_valid():
        form.save()
        return redirect("parents")
    context["form"] = form
    return render(request, "add.html", context)

def project_view(request, id):
    project = get_object_or_404(Project, id=id)

    if request.method == "DELETE":
        project.delete()
        return JsonResponse({"status": "success"})

    context = {
        "class": "project",
        "id": id
    }
    form = ProjectForm(request.POST or None, request.FILES or None, instance=project)
    if form.is_valid():
        form.save()
    context["form"] = ProjectForm(instance=project)
    return render(request, "edit.html", context)

def new_project_view(request):
    context = {
        "class": "project"
    }
    form = ProjectForm(request.POST or None, request.FILES or None)
    if form.is_valid():
        form.save()
        return redirect("projects")
    context["form"] = form
    return render(request, "add.html", context)

def table_view(request):
    return render(request, "table.html")

@require_POST
def set_parent(request, id):
    project = get_object_or_404(Project, id=id)
    parent_id = request.POST.get("parent_id") or None
    try:
        parent = Parent.objects.get(id=parent_id)
    except Parent.DoesNotExist:
        parent = None

    project.parent = parent
    project.save()
    return JsonResponse({"status": "success"})


def import_view(request):
    if request.method == "POST":
        form = ImportForm(request.POST, request.FILES)
        if form.is_valid():
            print(request.FILES)
            import_tasks(request.FILES["file"].read().decode("utf-8"))
            return redirect("dashboard")

    return render(request, "import.html")

def get_stats_by_month(request, year: int, month: int):
    if month < 1 or month > 12:
        return JsonResponse({"status": "error", "error": f"Invalid month {month}"})

    parents = Parent.objects.annotate(
        total_duration=Sum(
            "project__task__duration",
            filter=Q(
                project__task__date__year=year,
                project__task__date__month=month
            )
        )
    )
    projects = Project.objects.annotate(
        total_duration=Sum(
            "task__duration",
            filter=Q(
                task__date__year=year,
                task__date__month=month
            )
        )
    )
    clockings = Clocking.objects.filter(
        date__year=year,
        date__month=month
    )
    return JsonResponse({"status": "success", "data": format_stats(parents, projects, clockings)})

def get_stats_between(request, start_date: datetime.date, end_date: datetime.date):
    parents = Parent.objects.annotate(
        total_duration=Sum(
            "project__task__duration",
            filter=Q(
                project__task__date__gte=start_date,
                project__task__date__lt=end_date + timedelta(days=1)
            )
        )
    )
    projects = Project.objects.annotate(
        total_duration=Sum(
            "task__duration",
            filter=Q(
                task__date__gte=start_date,
                task__date__lt=end_date + timedelta(days=1)
            )
        )
    )
    clockings = Clocking.objects.filter(
        date__gte=start_date,
        date__lt=end_date + timedelta(days=1)
    )
    return JsonResponse({"status": "success", "data": format_stats(parents, projects, clockings)})

def format_stats(parents: QuerySet[Parent], projects: QuerySet[Project], clockings: QuerySet[Clocking]):
    data = {
        "parents": [
            {
                "id": parent.id,
                "name": parent.name,
                "project_num": parent.project_num,
                "is_productive": parent.is_productive,
                "duration": parent.total_duration
            }
            for parent in parents
        ],
        "projects": [
            {
                "id": project.id,
                "name": project.name,
                "duration": project.total_duration
            }
            for project in projects
        ],
        "clockings": ClockingSerializer(clockings, many=True).data
    }
    Clocking.objects.filter()
    return data

class ParentsView(generic.ListView):
    model = Parent
    template_name = "parents.html"
    context_object_name = "elements"

class ProjectsView(generic.ListView):
    model = Project
    template_name = "projects.html"
    context_object_name = "elements"
    ordering = ["parent"]

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["parents"] = Parent.objects.all()
        return context


def get_table_data(request, start_date: datetime.date, end_date: datetime.date):
    end_date = end_date + timedelta(days=1)
    clockings = Clocking.objects.filter(
        date__gte=start_date,
        date__lte=end_date
    )

    parents = Parent.objects.all().order_by("id")
    data = {
        "parents": [
            {
                "id": parent.id,
                "name": parent.name,
                "project_num": parent.project_num,
                "is_productive": parent.is_productive,
                "projects": [
                    {
                        "id": project.id,
                        "name": project.name,
                        "tasks": [
                            {
                                "date": task["date"],
                                "duration": task["duration"]
                            }
                            for task in project.task_set.filter(
                                date__gte=start_date,
                                date__lt=end_date
                            ).values("date").order_by("date").annotate(duration=Sum("duration"))
                        ]
                    }
                    for project in parent.project_set.order_by("id")
                ]
            }
            for parent in parents
        ],
        "clockings": ClockingSerializer(clockings, many=True).data
    }
    return JsonResponse({"status": "success", "data": data})

@require_POST
@csrf_exempt
def set_clocking(request, date: datetime.date):
    clocking, created = Clocking.objects.get_or_create(date=date)
    clocking.in_am = request.POST.get("in_am", clocking.in_am) or None
    clocking.out_am = request.POST.get("out_am", clocking.out_am) or None
    clocking.in_pm = request.POST.get("in_pm", clocking.in_pm) or None
    clocking.out_pm = request.POST.get("out_pm", clocking.out_pm) or None
    clocking.remote = request.POST.get("remote", clocking.remote) or None
    clocking.save()
    clocking.refresh_from_db()

    return JsonResponse({
        "status": "success",
        "clocking": ClockingSerializer(clocking).data
    })