from django.contrib.auth.decorators import login_required
from django.db.models import Q
from django.http import HttpResponse, HttpResponseRedirect, JsonResponse
from django.shortcuts import render, get_object_or_404
from django.views.decorators.http import require_http_methods
from django.urls import reverse

import pendulum

from jarvis.people.models import Gymnast

from .forms import (
    SkillForm,
    PasseForm,
    CombinationForm,
    CombinationSkillForm,
)
from .models import (
    Skill,
    Passe,
    Routine,
    Educative,
    RoutineSkill,
    TrainingProgram,
    PrerequisiteClosure,
)


@login_required
@require_http_methods(["POST"])
def educative_lookup(request):
    """
    Récupère la liste des skill à la volée suivant des caractères de recherche entrés (min 3
    caractères).
    """
    results = []
    pattern = request.POST.get("pattern", None)

    # Ignore queries shorter than length 2
    if pattern is not None and len(pattern) > 2:
        model_results = Educative.objects.filter(
            Q(short_label__icontains=pattern) | Q(long_label__icontains=pattern)
        )
        results = [
            {"ID": x.id, "long_label": x.long_label, "short_label": x.short_label}
            for x in model_results
        ]

    return JsonResponse(results, safe=False)


@login_required
@require_http_methods(["POST"])
def skill_lookup(request):
    """
    Récupère la liste des skill à la volée suivant des caractères de recherche entrés (min 3
    caractères).
    """
    results = []
    pattern = request.POST.get("pattern", None)

    # Ignore queries shorter than length 2
    if pattern is not None and len(pattern) > 2:
        model_results = Skill.objects.filter(
            Q(short_label__icontains=pattern)
            | Q(long_label__icontains=pattern)
            | Q(notation__icontains=pattern)
        )
        results = [
            {"ID": x.id, "Name": str(x), "Notation": x.notation} for x in model_results
        ]

    return JsonResponse(results, safe=False)


@login_required
@require_http_methods(["GET"])
def skill_without_prerequisite_listing(request):
    """
    Récupère la liste des skills n'ayant aucun prérequis.
    """
    skill_list = Skill.objects.filter(prerequisites=None)
    context = {"skill_list": skill_list}
    return render(request, "skills/list.html", context)


@login_required
@require_http_methods(["GET"])
def skill_listing(request, field=None, expression=None, value=None, level=None):
    """
    Récupère la liste des skills suivant un pattern si celui-ci est définit.

    Args:
        field           (str)   champ sur lequel doit être effectué la recherche
        expression      (str)   expression de comparaison : le, leq, ge, geq, …
        value           (str)   valeur de la recherche
        level           (int)   niveau requis pour les skills cherchés.
    """

    pattern = None

    if not field or not value or not expression:
        pattern = request.GET.get("pattern", None)

    if pattern:
        skill_list = Skill.objects.filter(
            Q(long_label__icontains=pattern) | Q(short_label__icontains=pattern)
        )
    elif field and expression and value:
        kwargs = {f"{field}__{expression}": value}
        skill_list = Skill.objects.filter(**kwargs)
    elif level is not None:
        skill_list = Skill.objects.filter(level=level)
    else:
        skill_list = Skill.objects.all()

    context = {"skill_list": skill_list}
    return render(request, "skills/list.html", context)


@login_required
@require_http_methods(["GET"])
def skill_tree(request, skill_id):
    """Récupère tout l'arbre des prérequis pour une saut passé en paramètre

    Args:
        skill_id    (int)   identifiant de la classe Skill
    """
    skill = get_object_or_404(Skill, pk=skill_id)
    node_dict = {}
    skill_closure = PrerequisiteClosure.objects.filter(descendant=skill)
    for closure in skill_closure:
        node_dict[closure.ancestor] = closure.ancestor.prerequisites.all()

    context = {"skill": skill, "node_dict": node_dict}
    return render(request, "skills/learning_line.html", context)


@login_required
@require_http_methods(["GET"])
def skill_details(request, skill_id):
    """Récupère toutes les informations d'un skill.

    La méthode en profite pour vérifier les champs level, rank, age_boy et age_girl
    par rapport aux pré-requis.

    Args:
        skill_id    (int)   identifiant de la classe Skill
    """
    skill = get_object_or_404(Skill, pk=skill_id)

    for prerequisite in skill.prerequisites.all():
        skill.level = max(prerequisite.level + 1, skill.level)
        skill.rank = max(prerequisite.rank + 1, skill.rank)

        skill.age_boy_with_help = max(
            skill.age_boy_with_help, prerequisite.age_boy_with_help
        )
        skill.age_boy_without_help = max(
            skill.age_boy_without_help, prerequisite.age_boy_without_help
        )
        skill.age_boy_chained = max(skill.age_boy_chained, prerequisite.age_boy_chained)
        skill.age_boy_masterised = max(
            skill.age_boy_masterised, prerequisite.age_boy_masterised
        )

        skill.age_girl_with_help = max(
            skill.age_girl_with_help, prerequisite.age_girl_with_help
        )
        skill.age_girl_without_help = max(
            skill.age_girl_without_help, prerequisite.age_girl_without_help
        )
        skill.age_girl_chained = max(
            skill.age_girl_chained, prerequisite.age_girl_chained
        )
        skill.age_girl_masterised = max(
            skill.age_girl_masterised, prerequisite.age_girl_masterised
        )

    skill.save()

    # Je sépare les educatifs de type "skill" et les éducatifs de type "combination" pour mieux
    # gérer l'affichage. Du code bien dégueulasse !
    # QTF : une idée pour faire ca de manière plus propre, plus élégante ?
    combination_dict = {}
    educative_skill = skill.educatives.filter(id__in=Skill.objects.all())
    for educative in skill.educatives.filter(id__in=Routine.objects.all()):
        combination = Routine.objects.get(pk=educative.id)
        combination_dict[combination] = []
        for educ_skill in combination.routine.skill_links.all():
            combination_dict[combination].append(educ_skill)

    context = {
        "skill": skill,
        "combination_dict": combination_dict,
        "educative_skill": educative_skill,
    }
    return render(request, "skills/details.html", context)


@login_required
@require_http_methods(["GET", "POST"])
def skill_create_or_update(request, skill_id=None):
    """Création ou modification d'un saut.

    Args:
        skill_id    (int)   identifiant d'un object de classe <Skill>.
    """

    if skill_id:
        skill = get_object_or_404(Skill, pk=skill_id)
    else:
        skill = None

    if request.method == "POST":
        form = SkillForm(request.POST, instance=skill)

        if form.is_valid():
            skill = form.save()
            return HttpResponseRedirect(reverse("skill_details", args=(skill.pk,)))
        return render(request, "skill/create.html", {"form": form})

    form = SkillForm(instance=skill)
    context = {"form": form, "skill_id": skill_id}
    return render(request, "skills/create.html", context)


@login_required
@require_http_methods(["GET"])
def competition_routine_listing(request, gymnast_id=None):
    """Récupère la liste des routines (séries) de compétition suivant un pattern si celui-ci est
    défini.

    Args:
        gymnast_id  (int)   identifiant de la classe Gymnast
    """

    gymnast = None
    pattern = request.GET.get("pattern", None)
    if pattern is not None and len(pattern) > 2:
        routine_list = Routine.objects.filter(
            is_routine=True, is_competitive=True
        ).filter(Q(long_label__icontains=pattern) | Q(short_label__icontains=pattern))
    else:
        if gymnast_id:
            routine_list = Routine.objects.filter(
                is_routine=True, is_competitive=True
            ).filter(done_by_gymnast__gymnast=gymnast_id)
            gymnast = Gymnast.objects.get(pk=gymnast_id)
        else:
            routine_list = Routine.objects.filter(is_routine=True, is_competitive=True)

    context = {
        "title": "Competition Routines",
        "routine_list": routine_list,
        "gymnast_id": gymnast_id,
        "gymnast": gymnast,
    }
    return render(request, "combinations/list.html", context)


@login_required
@require_http_methods(["GET"])
def routine_listing(request, gymnast_id=None):
    """Récupère la liste des routines (série) suivant un pattern si celui-ci est défini

    Args:
        gymnast_id  (int)   identifiant de la classe Gymnast
    """

    gymnast = None
    pattern = request.GET.get("pattern", None)
    base_queryset = Routine.objects.filter(is_routine=True)
    if pattern is not None and len(pattern) > 2:
        routine_list = base_queryset.filter(
            Q(long_label__icontains=pattern) | Q(short_label__icontains=pattern)
        )
    else:
        if gymnast_id:
            routine_list = base_queryset.filter(done_by_gymnast__gymnast=gymnast_id)
            gymnast = Gymnast.objects.get(pk=gymnast_id)
        else:
            routine_list = base_queryset

    context = {
        "title": "Routines",
        "routine_list": routine_list,
        "gymnast_id": gymnast_id,
        "gymnast": gymnast,
    }
    return render(request, "combinations/list.html", context)


@login_required
@require_http_methods(["GET"])
def educative_combination_listing(request, gymnast_id=None):
    """Récupère la liste des educatifs suivant un pattern si celui-ci est défini

    Args:
        gymnast_id  (int)   identifiant de la classe Gymnast
    """

    gymnast = None
    pattern = request.GET.get("pattern", None)
    base_queryset = Routine.objects.filter(is_routine=False)
    if pattern is not None and len(pattern) > 2:
        routine_list = base_queryset.filter(
            Q(long_label__icontains=pattern) | Q(short_label__icontains=pattern)
        )
    else:
        if gymnast_id:
            routine_list = base_queryset.filter(done_by_gymnast__gymnast=gymnast_id)
            gymnast = Gymnast.objects.get(pk=gymnast_id)
        else:
            routine_list = base_queryset

    context = {
        "title": "Educative",
        "routine_list": routine_list,
        "gymnast_id": gymnast_id,
        "gymnast": gymnast,
    }
    return render(request, "combinations/list.html", context)


@login_required
@require_http_methods(["GET"])
def combination_listing(request, gymnast_id=None):
    """Récupère la liste des combinaisons suivant un pattern si celui-ci est défini

    Args:
        gymnast_id  (int)   identifiant de la classe Gymnast
    """

    gymnast = None
    pattern = request.GET.get("pattern", None)
    if pattern is not None and len(pattern) > 2:
        routine_list = Routine.objects.filter(
            Q(long_label__icontains=pattern) | Q(short_label__icontains=pattern)
        )
    else:
        if gymnast_id:
            routine_list = Routine.objects.filter(done_by_gymnast__gymnast=gymnast_id)
            gymnast = Gymnast.objects.get(pk=gymnast_id)
        else:
            routine_list = Routine.objects.all()

    context = {
        "title": "Combinations",
        "routine_list": routine_list,
        "gymnast_id": gymnast_id,
        "gymnast": gymnast,
    }
    return render(request, "combinations/list.html", context)


@login_required
@require_http_methods(["POST"])
def combination_lookup(request, search_type=None):
    """
    Récupère la liste des combinaisons à la volée suivant des caractères de recherche entrés.
    """
    pattern = request.POST.get("pattern", None)

    if pattern is not None and len(pattern) > 2:
        results = Routine.objects.filter(
            Q(long_label__icontains=pattern) | Q(short_label__icontains=pattern)
        )

        if search_type:
            if search_type == "competitive":
                results = results.filter(is_competitive=1)
            elif search_type == "routine":
                results = results.filter(is_routine=1)

        combination_list = [{"id": x.id, "label": str(x)} for x in results]

    return JsonResponse(combination_list, safe=False)


@login_required
@require_http_methods(["GET"])
def combination_details(request, combination_id):
    """
    Récupère toutes les informations d'une combinaison.

    Args:
        combination_id  (int)   identifiant d'une routine
    """

    combination = get_object_or_404(Routine, pk=combination_id)
    combination.compute_informations()
    combination_string = combination.inline_str()
    context = {
        "combination": combination,
        "combination_string": combination_string,
        "skill_link_list": combination.skill_links.all(),
    }
    return render(request, "combinations/details.html", context)


@login_required
@require_http_methods(["GET", "POST"])
def combination_create_or_update(request, combination_id=None):
    """Création d'une série.

    Args:
        combination_id  (int)   identifiant d'un object de classe <routine>.
    """
    if combination_id:
        combination = get_object_or_404(Routine, pk=combination_id)
    else:
        combination = None

    if request.method == "POST":
        form = CombinationForm(request.POST, instance=combination)

        if form.is_valid():
            combination = form.save()
            # ici faire un FOR skill in form_skills_list:
            # record.save()  # ca sauve le record dans la table RoutineSkill
            # something like this :
            #       http://stackoverflow.com/questions/3074938/django-m2m-form-save-through-table
            # QTF : can you help me ?
            return HttpResponseRedirect(
                reverse("combination_details", args=(combination.pk,))
            )

        return render(request, "combinations/create.html", {"form": form})

    form = CombinationForm(instance=combination)
    context = {"form": form, "combination_id": combination_id}
    return render(request, "combinations/create.html", context)


@login_required
@require_http_methods(["GET"])
def compose_combination(request, combination_id):
    """
    Récupère une routine et les sauts associés sur base d'un id passé en paramètre.

    Args:
        combination_id  (int)   identifiant d'un object de classe <routine>.
    """

    routine = get_object_or_404(Routine, pk=combination_id)
    skill_link_list = routine.skill_links.all()
    skill_list = Skill.objects.all()
    context = {
        "routine": routine,
        "skill_link_list": skill_link_list,
        "number_of_skill": skill_link_list.count(),
        "skill_list": skill_list,
    }
    return render(request, "combinations/compose.html", context)


@require_http_methods(["POST"])
def link_skill_to_combination(request):
    """
    Recoit dans request trois informations permettant de lier complètement un saut à une routine :
        - combination_id    (int)   identifiant d'un object de classe <routine>
        - skill_id          (int)   identifiant d'un object de classe <skill>
        - rank              (int)   numéro de place du skill dans la routine
    """
    data = {
        "routine": get_object_or_404(Routine, pk=request.POST.get("combination_id", 0)),
        "skill": get_object_or_404(Skill, pk=request.POST.get("skill_id", 0)),
        "rank": request.POST.get("rank", 0),
    }
    form = CombinationSkillForm(data)

    if form.is_valid():
        link, created = RoutineSkill.objects.get_or_create(
            routine=form.cleaned_data["routine"],
            skill=form.cleaned_data["skill"],
            rank=form.cleaned_data["rank"],
        )
        return HttpResponse(200, (link, created))

    return HttpResponse(406)


@require_http_methods(["POST"])
def unlink_skill_from_combination(request):
    """
    Recoit dans request deux informations permettant d'enlever un skill d'une routine :
        - rank              (int)   numéro de place du skill dans la routine
        - combination_id    (int)   identifiant d'un object de classe <routine>
    """
    rank = request.POST.get("rank", None)
    combination_id = request.POST.get("combination_id", None)
    combination = get_object_or_404(Routine, pk=combination_id)
    try:
        RoutineSkill.objects.get(routine=combination, rank=rank).delete()
    except Exception:
        return HttpResponse(409)

    return HttpResponse(200)


@login_required
@require_http_methods(["GET"])
def passe_listing(request):
    """Liste des passages."""
    passe_listing = Passe.objects.all()
    context = {"passe_listing": passe_listing}
    return render(request, "passes/list.html", context)


@login_required
@require_http_methods(["GET"])
def passe_details(request, passe_id):
    """Détails d'un passage."""

    is_skill = False
    passe = get_object_or_404(Passe, pk=passe_id)
    educative_list = passe.educatives.all()
    number_of_educative = educative_list.count()

    context = {
        "passe": passe,
        "is_skill": is_skill,
        "educative_list": educative_list,
        "difficulty": passe.difficulty,
        "number_of_skill": passe.number_of_skill,
        "number_of_educative": number_of_educative,
    }
    return render(request, "passes/details.html", context)


@login_required
@require_http_methods(["GET", "POST"])
def passe_create_or_update(request, passe_id=None):
    """Création d'un passage.

    Args:
        passe_id  (int)   identifiant d'un object de classe <Passe>.
    """
    if passe_id:
        passe = get_object_or_404(Passe, pk=passe_id)
    else:
        passe = None

    if request.method == "POST":
        form = PasseForm(request.POST, instance=passe)

        if form.is_valid():
            passe = form.save()
            return HttpResponseRedirect(reverse("passe_details", args=(passe.pk,)))

        return render(request, "passes/create.html", {"form": form})

    form = PasseForm(instance=passe)
    context = {"form": form, "passe_id": passe_id}
    return render(request, "passes/create.html", context)


@login_required
@require_http_methods(["GET"])
def trainingprogram_details(request, date=None, gymnast_id=None):
    """Détails d'un entraînement."""
    trainingprogram_id = None
    if trainingprogram_id is not None:
        trainingprogram = get_object_or_404(TrainingProgram, pk=trainingprogram_id)
        trainingprogram_list = None
    else:
        trainingprogram = None
        trainingprogram_list = TrainingProgram.objects.all()
        parsed_date = pendulum.parse(date).date()
        if date is not None:
            trainingprogram_list = trainingprogram_list.filter(date=parsed_date)

        if gymnast_id is not None:
            trainingprogram_list = trainingprogram_list.filter(gymnast=gymnast_id)

        # trainingprogram_list = trainingprogram_list.order_by("rank")

        difficulty = 0
        number_of_skill = 0
        for trainingprogram in trainingprogram_list:
            difficulty += trainingprogram.difficulty
            number_of_skill += trainingprogram.number_of_skill

    context = {
        "date": parsed_date,
        "difficulty": difficulty,
        "number_of_skill": number_of_skill,
        "trainingprogram": trainingprogram,
        "trainingprogram_list": trainingprogram_list,
    }
    return render(request, "trainingprograms/details.html", context)


@require_http_methods(["POST"])
def switch_trainingprogram_line(request):
    """
    Recoit dans request deux identifiants de trainingprogram qu'il faut échanger () :
        - tp1   (int)   identifiant d'une instance de TraiingProgram
        - tp2   (int)   identifiant d'une instance de TraiingProgram

    J'utilise `32767` comme valeur intermédiaire pour le `rank` car c'est la limite supérieure d'un
    PositiveSmallIntegerField.
    """
    try:
        target_trainingprogram_id = request.POST.get("tp1", None)
        source_trainingprogram_id = request.POST.get("tp2", None)

        target_trainingprogram = get_object_or_404(
            TrainingProgram, pk=target_trainingprogram_id
        )
        source_trainingprogram = get_object_or_404(
            TrainingProgram, pk=source_trainingprogram_id
        )

        saved_source_rank = source_trainingprogram.rank
        saved_target_rank = target_trainingprogram.rank
        source_trainingprogram.rank = 32767
        source_trainingprogram.save()
        target_trainingprogram.rank = saved_source_rank
        target_trainingprogram.save()
        source_trainingprogram.rank = saved_target_rank
        source_trainingprogram.save()
    except Exception:
        return HttpResponse(409)

    return HttpResponse(200)