from apps.livestock.models import LiveStock, TemporaryLiveStock
from decimal import Decimal
from apps.herd.models import Rancher
from apps.warehouse.models import (
    InventoryEntry,
    InventoryQuotaSaleItem
)
from django.db.models import Sum
from apps.product.models import Quota, QuotaDistribution
from apps.herd.services.rancher_service import RancherService
from django.db.models import Count, Q
import typing


def get_rancher_statistics(rancher: Rancher = None) -> typing.Any:
    """ get statistics of a rancher """  # noqa

    livestocks = LiveStock.objects.filter(herd__rancher=rancher)  # noqa
    temporary_livestock = TemporaryLiveStock.objects.filter(rancher=rancher)

    if livestocks:
        stats = livestocks.aggregate(
            herd_count=Count("herd", distinct=True),
            light_count=Count('id', filter=Q(weight_type='L')),
            heavy_count=Count('id', filter=Q(weight_type='H')),
            sheep=Count('id', filter=Q(type__name='گوسفند')),  # noqa
            goat=Count('id', filter=Q(type__name='بز')),
            cow=Count('id', filter=Q(type__name='گاو')),
            camel=Count('id', filter=Q(type__name='شتر')),
            horse=Count('id', filter=Q(type__name='بز')),
        )
    else:
        stats = temporary_livestock.aggregate(
            herd_count=0,
            light_count=Count('id', filter=Q(livestock_type__weight_type='L')),
            heavy_count=Count('id', filter=Q(livestock_type__weight_type='H')),
            sheep=Count('id', filter=Q(livestock_type__name='گوسفند')),  # noqa
            goat=Count('id', filter=Q(livestock_type__name='بز')),
            cow=Count('id', filter=Q(livestock_type__name='گاو')),
            camel=Count('id', filter=Q(livestock_type__name='شتر')),
            horse=Count('id', filter=Q(livestock_type__name='بز')),
        )

    return [{'name': key, 'value': value} for key, value in stats.items()], stats


def rancher_quota_weight(
        rancher: Rancher,
        inventory_entry: InventoryEntry = None,
        distribution: QuotaDistribution = None
):
    """
    :param rancher: Rancher instance
    :param inventory_entry: InventoryEntry instance
    :param distribution: QuotaDistribution instance
    :return: dict {total, by_type}
    """

    live_stock_meta = {
        "گوسفند": "sheep",  # noqa
        "بز": "goat",
        "گاو": "cow",
        "شتر": "camel",
        "اسب": "horse"
    }

    if inventory_entry:
        quota: Quota = inventory_entry.distribution.quota
    elif distribution:
        quota: Quota = distribution.quota
    else:
        quota: Quota = Quota()

    # list of quota live stock allocations
    allocations = list(quota.livestock_allocations.all().select_related('livestock_type'))
    # list of quota incentive plans
    incentive_plans = list(quota.incentive_assignments.all().select_related('livestock_type'))

    livestock_counts_list, livestock_counts_dict = get_rancher_statistics(rancher)

    total_weight = 0
    merged = {}

    # calculate quota base weight by livestock type & base total weight
    for item in allocations:  # noqa
        if item.livestock_type:
            animal_type_fa = item.livestock_type.name
            animal_type_en = item.livestock_type.en_name
            per_head = item.quantity_kg
            count = livestock_counts_dict.get(live_stock_meta.get(animal_type_fa), 0)

            weight = per_head * count
            total_weight += weight

            if animal_type_en not in merged:
                merged[animal_type_en] = {
                    "name_fa": animal_type_fa,
                    "weight": weight,
                    "type": item.livestock_type.weight_type
                }
            else:
                merged[animal_type_en]['weight'] += weight

    # calculate rancher incentive plans weight by livestock type & add it to total_weight
    for item in incentive_plans:
        rancher_plans = item.incentive_plan.rancher_plans.select_related(
            'rancher',
            'livestock_type'
        ).filter(rancher=rancher, livestock_type=item.livestock_type)
        if rancher_plans.exists():
            # multiple count of rancher livestock on incentive plan &
            # incentive plan quantity by this livestock type
            rancher_plan_weight = rancher_plans.first().allowed_quantity * item.quantity_kg
            total_weight += rancher_plan_weight

    # get rancher remaining usage of quota for purchase
    rancher_remaining_usage = RancherService.get_total_used_weight(rancher, InventoryQuotaSaleItem)

    return {
        "total_weight": total_weight,
        "remaining_weight": total_weight - rancher_remaining_usage,
        "by_type": [{
            "name": key,
            "name_fa": value['name_fa'],
            "weight": value['weight'],
            "type": value['type']
        } for key, value in merged.items()]
    }