import json

from app.utils.api.api_list import header_for_table
from django.contrib.auth.decorators import login_required
from django.db import models
from django.db.models.fields.related import RelatedField
from django.http import JsonResponse
from items.models import Item, ItemType


@login_required
def item_list(request):

    items = Item.objects.filter(author=request.user.setting)
    types = ItemType.objects.filter(author=request.user.setting)

    return JsonResponse(
        {
            "result": {
                "items": list(items.serialize()),
                "items_headers": header_for_table(Item),
                "types": list(types.serialize()),
                "types_headers": header_for_table(ItemType),
            },
            "count": items.count(),
        }
    )


@login_required
def item_edit(request, id=None):
    """Create/edit item view."""

    if id:
        item = Item.objects.filter(id=id, author=request.user.setting).first()

    else:
        item = Item(author=request.user.setting)

    if not item:
        return JsonResponse({}, status=404)

    if request.method == "DELETE":
        try:
            item.delete()

        except Exception:
            return JsonResponse({"error": "INVALID_DELETE"}, status=401)

        return JsonResponse({})

    if request.method != "POST":
        return JsonResponse({}, status=405)

    try:
        data = json.loads(request.body)

    except Exception:
        return JsonResponse({"error": "INVALID_DATA"}, status=401)

    for field in item._meta.fields:
        if field.name in item.Serialization.excluded_fields_edit:
            continue

        if isinstance(field, RelatedField):
            # For now, disregard related field (fk, m2m, 1-1)
            if isinstance(field, models.ForeignKey):
                setattr(item, f"{field.name}_id", data[field.name])

            continue

        if field.name not in data:
            continue

        setattr(item, field.name, data[field.name])

    try:
        item.save()

    except Exception:
        return JsonResponse({"error": "DATA_INVALID"}, status=401)

    return JsonResponse(
        {
            "object": Item.objects.filter(id=item.id).serialize().first(),
        }
    )