from itertools import zip_longest

from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import render, get_object_or_404
from django.db.models import Q
from django.urls import reverse

from collections import OrderedDict

from django.views.decorators.http import require_http_methods
from django.contrib.auth.decorators import login_required

from .models import (
    Transaction,
    TransactionType,
    EvaluationRules,
    EvaluationRulesAdaptation,
    Annuality,
    ComplementaryInformations,
)

from .forms import TransactionForm

from .tools import (
    get_transactions_and_sums_for_year_and_type,
    get_transactiontypes_and_total_amount_transactions,
    get_transactiontype_and_sum_for_spf_export,
    get_right_engagement_and_sump_spf,
    get_asset_liability_and_sump_spf,
)

from tools.pdf_generator import (
    SpfDocument,
    BillPaper,
)

import locale

EXTENSES = 0
RECETTES = 1


@login_required
@require_http_methods(["GET"])
def comptability_export(request, accounting_year, export_type):
    """
    Définit une fonction d'export.

    Args:
        request: La requête HTTP
        accounting_year (int): L'année à exporter.
        export_type (string): à choisir parmi `sxs` (side by side) ou `ooo` (one over other).

    Returns:
        render_to_response sur la page HTML correspondante.
    """
    if export_type == "sxs":
        return get_transaction_list_for_accountingyear_sxs(request, accounting_year)
    else:
        return get_transaction_list_for_accountingyear_ooo(request, accounting_year)


@login_required
@require_http_methods(["GET"])
def get_transaction_list_for_accountingyear_ooo(request, accounting_year):
    """
    Affichage et calcul des `Recettes` et `Dépenses` pour une année donnée dans deux tableaux l'un
    au dessus de l'autre (one over other - ooo).

    Args:
        accounting_year (int): année comptable
    """
    transactions_list_expenses = get_transactions_and_sums_for_year_and_type(
        accounting_year, EXTENSES
    )
    transactions_list_recettes = get_transactions_and_sums_for_year_and_type(
        accounting_year, RECETTES
    )
    context = {
        "transactions_list_expenses": transactions_list_expenses,
        "accounting_year": accounting_year,
        "transactions_list_recettes": transactions_list_recettes,
    }

    return render(request, "comptability/year_transaction_export_ooo.html", context)


@login_required
@require_http_methods(["GET"])
def get_transaction_list_for_accountingyear_sxs(request, accounting_year):
    """
    Calcule et affiche la comptabilité d'une année passée en parametre dans un unique tableau (side
    by side).

    Args:
        accounting_year (int): année comptable
    """
    expenses_transactiontypes_list = get_transactiontypes_and_total_amount_transactions(
        accounting_year, EXTENSES
    )
    recettes_transactiontypes_list = get_transactiontypes_and_total_amount_transactions(
        accounting_year, RECETTES
    )

    transactiontypes_list = zip_longest(
        recettes_transactiontypes_list["transactiontypes_info_list"],
        expenses_transactiontypes_list["transactiontypes_info_list"],
    )

    context = {
        "transactiontypes_list": transactiontypes_list,
        "accounting_year": accounting_year,
        "total_expenses": expenses_transactiontypes_list["total"],
        "total_recettes": recettes_transactiontypes_list["total"],
    }
    return render(request, "comptability/year_transaction_export_sxs.html", context)


@login_required
@require_http_methods(["GET"])
def export_year_spf_finance(request, accounting_year):
    """
    Calcule et affiche la comptabilité d'une année passée en parametre dans un unique tableau (side
    by side).

    Args:
        accounting_year (int): année comptable
    """
    annuality = Annuality.objects.filter(year__year=accounting_year)

    transactiontypes_list_expenses = get_transactiontype_and_sum_for_spf_export(
        accounting_year, EXTENSES
    )
    transactiontypes_list_recettes = get_transactiontype_and_sum_for_spf_export(
        accounting_year, RECETTES
    )
    transactiontypes_list = [
        x
        for x in zip_longest(
            transactiontypes_list_recettes["transaction_type_info"],
            transactiontypes_list_expenses["transaction_type_info"],
        )
    ]

    # règle d'évaluation
    rules_list = EvaluationRules.objects.filter(
        Q(stop_date__year__lte=accounting_year) | Q(stop_date__isnull=True)
    ).exclude(start_date__year__gt=accounting_year)

    rules_adaptation_list = EvaluationRulesAdaptation.objects.filter(
        start_date__year=accounting_year
    )
    complementary_informations = ComplementaryInformations.objects.filter(
        annuality=annuality[0]
    )

    liquidity = 0
    assets_list = get_asset_liability_and_sump_spf(accounting_year, category=0)
    for item in assets_list:
        if item[0] == "Liquidité":
            item[1] += (
                annuality[0].opening_balance
                + transactiontypes_list_recettes["sum_total_transaction"]
                - transactiontypes_list_expenses["sum_total_transaction"]
            )
            liquidity = item[1]

    asset_liability_list = get_asset_liability_and_sump_spf(accounting_year, category=1)
    asset_liability_sum = [x for x in zip_longest(assets_list, asset_liability_list)]

    right_list = get_right_engagement_and_sump_spf(accounting_year, category=0)
    engagement_list = get_right_engagement_and_sump_spf(accounting_year, category=1)
    right_engagement_sum = [x for x in zip_longest(right_list, engagement_list)]

    if len(right_engagement_sum) == 0:
        right_engagement_sum = None

    annuality[0].closing_balance = liquidity
    annuality[0].save()

    context = {
        "transactiontypes_list": transactiontypes_list,
        "accounting_year": accounting_year,
        "total_expenses": transactiontypes_list_expenses["sum_total_transaction"],
        "total_recette": transactiontypes_list_recettes["sum_total_transaction"],
        "rules_list": rules_list,
        "rules_adaptation_list": rules_adaptation_list,
        "complementary_informations": complementary_informations,
        "asset_liability_sum": asset_liability_sum,
        "right_engagement_sum": right_engagement_sum,
    }

    return render(request, "comptability/year_transaction_export_spf.html", context)


@login_required
@require_http_methods(["GET"])
def generate_pdf_for_spf(request, accounting_year):
    """ Génère un fichier PDF suivant les contraintes du SPF Finances

    Args:
        accounting_year (int): année

    Returns:
        ???
    """
    response = HttpResponse(content_type="application/pdf")
    response["Content-Disposition"] = (
        'attachment; filename="comptes_simplifies_annuels_' + str(accounting_year) + '.pdf"'
    )
    document = SpfDocument(response)
    document.generate(str(accounting_year))
    document.download()

    return response


def __get_transactions_for_accounting_year_and_kind(
    accounting_year, transaction_kind=None
):
    """
    """

    transactions_list = Transaction.objects.by_year(accounting_year)

    if transaction_kind == "bank":
        transaction_kind = "Banque"
        transactions_list = transactions_list.filter(bkAmount__isnull=False).exclude(
            bkAmount=0
        )

    elif transaction_kind == "box":
        transaction_kind = "Caisse"
        transactions_list = transactions_list.filter(bxAmount__isnull=False).exclude(
            bxAmount=0
        )

    else:
        transaction_kind = "Tous"

    transactions_list = transactions_list.order_by("registrationDate")

    return transactions_list, transaction_kind


@login_required
@require_http_methods(["GET"])
def transaction_by_year_listing(request, accounting_year, transaction_kind=None):
    """ Liste toutes les lignes de comptabilité pour une année recue en paramètre

    Args:
        accounting_year (int): année comptable
        transaction_kind (string):
    """

    (
        transactions_list,
        transaction_kind,
    ) = __get_transactions_for_accounting_year_and_kind(
        accounting_year, transaction_kind
    )

    # pour mon dictionnaire date/total
    previous_date = None
    date_sum = OrderedDict()

    tmp_Total = 0
    tmp_Amount = 0
    sum_extense = 0
    sum_extense_simulated = 0
    sumrecette = 0
    sumrecette_simulated = 0
    transaction_list_and_sum = []

    for transaction in transactions_list:

        # transaction type :
        #   0 : dépense
        #   1 : recette
        # Suivant le type de la transaction, on ajoute son montant aux recettes ou au dépenses et
        # on ajoute le signe ("+" ou "-") afin de pouvoir l'utiliser dans des calculs après.
        tmp_Amount = transaction.totalAmount
        if transaction.transaction_type.transaction_type == EXTENSES:
            sum_extense_simulated += tmp_Amount
            if transaction.is_simulated is not None and transaction.is_simulated == 0:
                sum_extense += tmp_Amount
            tmp_Amount = -tmp_Amount
        else:
            sumrecette_simulated += tmp_Amount
            if transaction.is_simulated is not None and transaction.is_simulated == 0:
                sumrecette += tmp_Amount

        # Si la transaction n'est pas simulée on ajoute la transaction au total temporaire.
        if (
            transaction.is_simulated is not None and transaction.is_simulated == 0
        ) and (transaction.is_done is not None and transaction.is_done == 1):
            tmp_Total += tmp_Amount

        transaction_list_and_sum.append((transaction, tmp_Total))

        if transaction.registrationDate.date() in date_sum:
            date_sum[transaction.registrationDate.date()] += tmp_Amount
        else:
            if previous_date is not None:
                date_sum[transaction.registrationDate.date()] = (
                    date_sum[previous_date] + tmp_Amount
                )
            else:
                date_sum[transaction.registrationDate.date()] = tmp_Amount

        previous_date = transaction.registrationDate.date()

    total = sumrecette - sum_extense
    total_simulated = sumrecette_simulated - sum_extense_simulated

    nb_transaction = transactions_list.count()
    context = {
        "transaction_list": transaction_list_and_sum,
        "accounting_year": accounting_year,
        "totaldepense": sum_extense,
        "totalrecette": sumrecette,
        "totaldepense_simulated": sum_extense_simulated,
        "totalrecette_simulated": sumrecette_simulated,
        "total": total,
        "total_simulated": total_simulated,
        "date_sum": date_sum,
        "nb_transaction": nb_transaction,
        "t_type": transaction_kind,
    }
    return render(request, "comptability/transactions/listing.html", context)


@login_required
@require_http_methods(["GET"])
def year_listing(request):
    """
    Liste toutes les années pour lesquelles il y a des transactions.
    """
    years = Transaction.objects.dates("registrationDate", "year")

    year_list = []
    for year in years:
        year_list.append((year.year, Transaction.objects.by_year(year.year).count(),))

    context = {"year_list": year_list}
    return render(request, "year_listing.html", context)


@login_required
@require_http_methods(["GET"])
def transaction_listing_for_year_and_type(
    request, accounting_year, transaction_type_id
):
    """
    Liste toutes les transactions d'un `type de transaction` et pour une année passés en paramètre.

    Args:
        request (???):
        accounting_year (int): année
        transaction_type_id (int): id d'un type de transaction

    Returns:
        (???)
    """
    transaction_type = TransactionType.objects.get(pk=transaction_type_id)
    # by_year_condition = Q(registrationDate__year=accounting_year)
    by_type_condition = Q(transaction_type=transaction_type_id)
    by_parent_type_condition = Q(transaction_type__parent=transaction_type_id)

    transaction_list = (
        Transaction.objects.by_year(accounting_year)
        .filter((by_type_condition | by_parent_type_condition))
        .order_by("registrationDate")
    )

    total = 0
    total_simulated = 0
    transaction_list_and_sum = []
    for transaction in transaction_list:
        total_simulated += transaction.totalAmount
        if transaction.is_simulated is not None and transaction.is_simulated == 0:
            total += transaction.totalAmount

        transaction_list_and_sum.append((transaction, total))

    context = {
        "transaction_list": transaction_list_and_sum,
        "transaction_type": str(transaction_type),
        "accounting_year": accounting_year,
        "total_simulated": total_simulated,
        "total": total,
    }
    return render(request, "transactions/listing.html", context)


@login_required
@require_http_methods(["GET"])
def transaction_details(request, transaction_id):
    """
    Renvoie les détails d'une ligne de comptabilité.
    """
    transaction = Transaction.objects.get(pk=transaction_id)
    context = {"event": transaction.event, "transaction": transaction}
    # changed template
    return render(request, "transactions/details.html", context)


@login_required
@require_http_methods(["GET", "POST"])
def transaction_create_or_update(request, transaction_id=None):
    """ Création ou modificatin d'une transaction.

    Args:
        transaction_id (int): identifiant d'une transaction.
    """

    if transaction_id:
        transaction = get_object_or_404(Transaction, pk=transaction_id)
    else:
        transaction = None

    if request.method == "POST":
        form = TransactionForm(request.POST, instance=transaction)

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

    else:
        form = TransactionForm(instance=transaction)

    context = {"form": form, "transaction_id": transaction_id}
    return render(request, "transactions/create.html", context)