from django.shortcuts import render
from django.http import HttpResponse, HttpResponseRedirect, JsonResponse
from django.views.generic import ListView
from django.db import transaction

from .models.sales import Sale, SaleLine
from .models.customers import Customer
from .models.sales import Sale, SaleLine, Payment
from .models.products import Product, ProductCategory
from .models.payments import PaymentMethods, ReconciliationJar

import csv
import io
import json
from decimal import Decimal


class DecimalEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, Decimal):
            return float(obj)
        return json.JSONEncoder.default(self, obj)


def index(request):
    return render(request, "don_confiao/index.html")


def products(request):
    return JsonResponse(Product.to_list(), safe=False)


def _categories_from_csv_string(categories_string, separator="&"):
    categories = categories_string.split(separator)
    clean_categories = [c.strip() for c in categories]
    return [_category_from_name(category) for category in clean_categories]


def _category_from_name(name):
    return ProductCategory.objects.get_or_create(name=name)[0]


def handle_import_products_file(csv_file):
    data = io.StringIO(csv_file.read().decode("utf-8"))
    reader = csv.DictReader(data, quotechar='"')
    for row in reader:
        product, created = Product.objects.update_or_create(
            name=row["producto"],
            defaults={
                "price": row["precio"],
                "measuring_unit": row["unidad"],
            },
        )
        categories = _categories_from_csv_string(row["categorias"])
        product.categories.clear()
        for category in categories:
            product.categories.add(category)


def handle_import_customers_file(csv_file):
    data = io.StringIO(csv_file.read().decode("utf-8"))
    reader = csv.DictReader(data, quotechar='"')
    for row in reader:
        customer, created = Customer.objects.update_or_create(
            name=row["nombre"],
            defaults={"email": row["correo"], "phone": row["telefono"]},
        )


def sales_to_tryton_csv(sales):
    tryton_sales_header = [
        "Tercero",
        "Dirección de facturación",
        "Dirección de envío",
        "Descripción",
        "Referencia",
        "Fecha venta",
        "Plazo de pago",
        "Almacén",
        "Moneda",
        "Líneas/Producto",
        "Líneas/Cantidad",
        "Líneas/Precio unitario",
        "Líneas/Unidad",
        "Empresa",
        "Tienda",
        "Terminal de venta",
        "Autorecogida",
        "Comentario",
    ]

    csv_data = [tryton_sales_header]
    for sale in sales:
        sale_lines = SaleLine.objects.filter(sale=sale.id)
        if not sale_lines:
            continue
        lines = []
        first_sale_line = sale_lines[0]
        customer_info = [sale.customer.name] * 3 + [sale.description] * 2
        first_line = customer_info + [
            sale.date.strftime("%Y-%m-%d"),
            "Contado",
            "Almacén",
            "Peso colombiano",
            first_sale_line.product.name,
            first_sale_line.quantity,
            first_sale_line.unit_price,
            "Unidad",
            "TIENDA LA ILUSIÓN",
            "Tienda La Ilusion",
            "La Ilusion",
            True,
            sale.description,
        ]
        lines.append(first_line)
        for line in sale_lines[1:]:
            lines.append(
                [""] * 9
                + [
                    line.product.name,
                    line.quantity,
                    line.unit_price,
                    "Unidad",
                ]
                + [""] * 5
            )
        for row in lines:
            csv_data.append(row)

    return csv_data