import datetime
from io import BytesIO

import pandas as pd
from django.contrib.gis.measure import Distance
from django.db.models import F

from postamates.settings import DEFAULT_PLACEMENT_POINT_UPDATE_RADIUS
from service import models
from service.enums import PointStatus
from service.tasks import raschet
from service.utils import create_columns_dist
import base64
import requests
from postamates.settings import GEOCODER_API_KEY
from service.enums import MatchingStatus


class PointService:

    def update_fact(self, postamat_id: str, fact: int):
        qs = self.get_point_by_postamat_id(postamat_id)
        qs.update(**{'fact': fact})

    def update_postamat_id(self, point_id: int, postamat_id: str):
        qs = self.get_point_by_id(point_id)
        qs.update(**{'postamat_id': postamat_id})

    @staticmethod
    def start_mathing(obj_id: int):
        file = models.TempFiles.objects.get(id=obj_id)
        excel_file = base64.b64decode(file.data)
        df = pd.read_excel(excel_file)
        total = df.shape[0]
        matched = 0
        problem = 0
        for _i, row in df.iterrows():
            addr = row['Адрес']
            cat = row['Категория объекта']
            req_url = f"https://geocode.search.hereapi.com/v1/geocode?q={addr}&apiKey={GEOCODER_API_KEY}"
            response = requests.get(req_url).json().get('items')
            if not response:
                models.PrePlacementPoint.objects.create(address=addr, matching_status=MatchingStatus.Error.name)
                problem+=1
                continue
            response = response[0]['address']
            obj = models.PlacementPoint.objects.filter(street=response['street'], house_number=response['houseNumber'],
                                                       category=cat).values().first()
            if obj:
                obj.pop('id')
                models.PrePlacementPoint.objects.create(**{**obj, "matching_status": MatchingStatus.Matched.name})
                matched += 1
            else:
                models.PrePlacementPoint.objects.create(address=addr, street=response['street'],
                                                        house_number=response['houseNumber'],
                                                        category=cat, matching_status=MatchingStatus.New.name)
        models.TempFiles.objects.all().delete()
        return total, matched, problem

    @staticmethod
    def get_min_distances_to_group(postamat_id: str):
        return {d['pvz_postamates_group']: d['dist'] for d in list(
            models.PlacementPointPVZDistance.objects.filter(placement_point=postamat_id).values(
                'pvz_postamates_group', 'dist'))}

    @staticmethod
    def update_points_in_radius(qs: models.PlacementPoint, new_status: str):
        triggers = False
        for point in qs:
            if new_status == PointStatus.Installation.name:
                if point.status == PointStatus.Pending.name:
                    pnts = models.PlacementPoint.objects.filter(
                        geometry__distance_lt=(point.geometry, Distance(m=DEFAULT_PLACEMENT_POINT_UPDATE_RADIUS)),
                    )
                    pnts.update(prediction_first=F('prediction_current'), target_post_cnt=F('target_post_cnt') + 1)
                    triggers = True
            elif new_status == PointStatus.Cancelled.name or new_status == PointStatus.Pending.name:
                if point.status == PointStatus.Installation.name:
                    pnts = models.PlacementPoint.objects.filter(
                        geometry__distance_lt=(point.geometry, Distance(m=DEFAULT_PLACEMENT_POINT_UPDATE_RADIUS)),
                    )
                    pnts.update(target_post_cnt=F('target_post_cnt') - 1 if F('target_post_cnt') != 0 else 0)
                    triggers = True
            elif new_status == PointStatus.Working.name and point.status == PointStatus.Pending.name:
                triggers = True
        if triggers:
            raschet.delay()

    @staticmethod
    def update_status(qs: models.PlacementPoint, new_status: str) -> models.PlacementPoint:
        for q in qs:
            if q.status == PointStatus.Installation.name and new_status == PointStatus.Working.name:
                qs.update(**{'age_day': 0, 'start_date': datetime.datetime.now(), 'status': new_status})
            else:
                qs.update(**{'status': new_status})

    @staticmethod
    def get_point_by_id(point_id: int):
        return models.PlacementPoint.objects.filter(pk=point_id)

    @staticmethod
    def get_point_by_postamat_id(postamat_id: str):
        return models.PlacementPoint.objects.filter(postamat_id=postamat_id)

    @staticmethod
    def to_excel(serializer):
        data = pd.DataFrame(serializer.data)
        if not data.empty:
            if data['start_date'].any():
                data['start_date'] = data.get('start_date').dt.tz_localize(None)
            if data['sample_trn'].any():
                data['sample_trn'] = data['sample_trn'].astype(int)
            data.rename(columns={'district_id': 'district', 'area_id': 'area'}, inplace=True)
            data['min_distance_to_group'] = data['min_distance_to_group'].apply(lambda x: list(x.items()))
            new_columns = data.apply(create_columns_dist, axis=1)
            for ind in new_columns.columns:
                expanded = new_columns[ind].apply(pd.Series)
                group = models.Post_and_pvzGroup.objects.get(id=int(expanded.loc[0, 0]))
                expanded[[f"group_{ind + 1}_name", f"group_{ind + 1}_category"]] = group.name, group.category.name
                expanded = expanded.rename(columns={1: f"dist_to_group_{ind + 1}"})
                expanded = expanded.drop(0, axis=1)
                new_columns = pd.concat([new_columns, expanded], axis=1)
                new_columns = new_columns.drop(ind, axis=1)
            data.drop('min_distance_to_group', axis=1, inplace=True)
            data = pd.concat([data, new_columns], axis=1)
        with BytesIO() as b:
            with pd.ExcelWriter(b) as writer:
                data.to_excel(
                    writer, sheet_name='Placement Points',
                    index=False,
                )
            return b.getvalue()

    @staticmethod
    def to_json(serializer):
        data = pd.DataFrame(serializer.data)
        data['start_date'] = pd.to_datetime(data['start_date'], errors='coerce')
        data['start_date'] = data['start_date'].dt.tz_localize(None)
        data['sample_trn'] = data['sample_trn'].astype(int)
        data['geometry'] = data['geometry'].apply(lambda x: {'latitude': x[1], 'longtitude': x[0]})
        data.rename(columns={'district_id': 'district', 'area_id': 'area'}, inplace=True)
        data['min_distance_to_group'] = data['min_distance_to_group'].apply(lambda x: list(x.items()))
        new_columns = data.apply(create_columns_dist, axis=1)
        for ind in new_columns.columns:
            expanded = new_columns[ind].apply(pd.Series)
            group = models.Post_and_pvzGroup.objects.get(id=int(expanded.loc[0, 0]))
            expanded[[f"group_{ind + 1}_name", f"group_{ind + 1}_category"]] = group.name, group.category.name
            expanded = expanded.rename(columns={1: f"dist_to_group_{ind + 1}"})
            expanded = expanded.drop(0, axis=1)
            new_columns = pd.concat([new_columns, expanded], axis=1)
            new_columns = new_columns.drop(ind, axis=1)
        data.drop('min_distance_to_group', axis=1, inplace=True)
        data = pd.concat([data, new_columns], axis=1)
        return data.to_json(orient='records')

    @staticmethod
    def get_first_10_k():
        if models.PlacementPoint.objects.count() > 10000:
            qs = models.PlacementPoint.objects.order_by('-prediction_current').all()[10000]
            return qs.prediction_current
        else:
            return models.PlacementPoint.objects.order_by('prediction_current').first().prediction_current