import uuid

from django.contrib.auth.mixins import LoginRequiredMixin
from django.http import HttpResponseBadRequest
from django.shortcuts import render
from django.urls import reverse
from django.views import View
from rest_framework.parsers import FormParser
from two_factor.views.mixins import OTPRequiredMixin

from core.exchanges import GenericAPIError
from core.models import Account, Trade
from core.util import logs

log = logs.get_logger(__name__)


def get_positions(user, account_id=None):
    items = []
    accounts = Account.objects.filter(user=user)
    for account in accounts:
        try:
            positions = account.client.get_all_positions()
        except GenericAPIError:
            continue

        for item in positions:
            items.append(item)
    return items


def annotate_positions(positions, user, return_order_ids=False):
    """
    Annotate positions with trade information.
    If return_order_ids is True, yield a list of order_ids instead of a list of trades.
    :param positions: list of positions
    :param user: user
    :param return_order_ids: whether to return a generator of order_ids
    :return: None or list of order_ids
    :rtype: None or generator
    """
    for item in positions:
        try:
            if "trade_ids" in item:
                if return_order_ids:
                    for trade_id in Trade.objects.filter(
                        user=user, order_id__in=item["trade_ids"]
                    ):
                        yield trade_id.order_id
                else:
                    item["trades"] = Trade.objects.filter(
                        user=user, order_id__in=item["trade_ids"]
                    )
        except Trade.DoesNotExist:
            pass


class Positions(LoginRequiredMixin, OTPRequiredMixin, View):
    allowed_types = ["modal", "widget", "window", "page"]
    window_content = "window-content/objects.html"
    list_template = "partials/position-list.html"
    page_title = "Live positions from all exchanges"
    page_subtitle = "Manual trades are editable under 'Bot Trades' tab."

    def get(self, request, type, account_id=None):
        if type not in self.allowed_types:
            return HttpResponseBadRequest
        self.template_name = f"wm/{type}.html"
        unique = str(uuid.uuid4())[:8]
        items = get_positions(request.user, account_id)
        annotate_positions(items, request.user, return_order_ids=False)

        orig_type = type
        if type == "page":
            type = "modal"
        cast = {
            "type": orig_type,
        }
        if account_id:
            cast["account_id"] = account_id
        list_url = reverse("positions", kwargs={**cast})
        context = {
            "title": f"Positions ({type})",
            "unique": unique,
            "window_content": self.window_content,
            "list_template": self.list_template,
            "items": items,
            "type": type,
            "page_title": self.page_title,
            "page_subtitle": self.page_subtitle,
            "list_url": list_url,
            "context_object_name_singular": "position",
            "context_object_name": "positions",
        }
        # Return partials for HTMX
        if self.request.htmx:
            if orig_type == "page":
                self.template_name = self.list_template
            else:
                context["window_content"] = self.list_template
        return render(request, self.template_name, context)


class PositionAction(LoginRequiredMixin, OTPRequiredMixin, View):
    allowed_types = ["modal", "widget", "window", "page"]
    window_content = "window-content/view-position.html"
    parser_classes = [FormParser]

    def get(self, request, type, account_id, symbol):
        """
        Get live information for a trade.
        """
        if type not in self.allowed_types:
            return HttpResponseBadRequest()
        template_name = f"wm/{type}.html"
        unique = str(uuid.uuid4())[:8]

        account = Account.get_by_id(account_id, request.user)
        info = account.client.get_position_info(symbol)
        valid_trade_ids = list(
            annotate_positions([info], request.user, return_order_ids=True)
        )

        # Remove some fields from the info dict
        del info["long"]
        del info["short"]

        if type == "page":
            type = "modal"
        context = {
            "title": f"Position info ({type})",
            "unique": unique,
            "window_content": self.window_content,
            "type": type,
            "items": info,
            "valid_trade_ids": valid_trade_ids,
        }

        return render(request, template_name, context)

    def delete(self, request, account_id, side, symbol):
        """
        Close a position.
        """
        template_name = "partials/notify.html"
        account = Account.get_by_id(account_id, request.user)
        try:
            api_response = account.client.close_position(side, symbol)
        except GenericAPIError as e:
            context = {"message": e, "class": "danger"}
            return render(request, template_name, context)
        if "longOrderCreateTransaction" in api_response:
            context = {
                "message": f"Long position closed on {symbol}",
                "class": "success",
            }
        elif "shortOrderCreateTransaction" in api_response:
            context = {
                "message": f"Short position closed on {symbol}",
                "class": "success",
            }
        response = render(request, template_name, context)
        response["HX-Trigger"] = "positionEvent"
        return response