#!/usr/bin/env python3
from flask import request, current_app, Response, jsonify
from flask_classful import FlaskView, route
from utils import json_required, influxdb_instance
from influxdb_client import Point


class ReportBuilder:

    def __init__(self, tags: tuple):
        self._tags = tags
        self._report = {}

    def update(self, query_result, type_: str, aggregator: str):
        for table in query_result:
            for row in table.records:
                key = ":".join(row.values[tag] for tag in self._tags)
                if key not in self._report:
                    self._report[key] = {}

                if type_ not in self._report[key]:
                    self._report[key][type_] = {}

                self._report[key][type_][aggregator] = row.values['_value']

    def get_report(self) -> dict:
        return self._report


class ReportView(FlaskView):

    # LINK

    @route("/link", methods=['POST'])
    @json_required
    def link_post(self):
        data = request.json

        points = []

        for type_ in ['latency', 'rate']:
            if type_ in data['measurements']:
                points.append(
                    Point(f"link_{type_}")
                        .tag("client", data['client'])
                        .tag("site", data['site'])
                        .field("value", data['measurements'][type_])
                )

        influxdb_instance.connection.write_api().write("alma", current_app.config['INFLUXDB_V2_ORG'], points)
        return Response(status=201)

    @route("/link", methods=['GET'])
    def link_get(self):
        rep = ReportBuilder(('client', 'site'))

        for type_ in ['latency', 'rate']:
            for aggregator in [('mean', 'mean()'), ('derivative', 'derivative(unit: 5s)')]:
                query = f"""from(bucket: "alma")
                |> range(start: -2m, stop: now())
                |> filter(fn: (r) => r["_measurement"] == "link_{type_}")
                |> {aggregator[1]}
                |> yield()"""
                rep.update(
                    influxdb_instance.query_api.query(query),
                    type_,
                    aggregator[0]
                )

        return jsonify(rep.get_report())

    # CLIENT

    @route("/client", methods=['POST'])
    @json_required
    def client_post(self):
        data = request.json

        points = []

        for type_ in ['queue']:
            if type_ in data['measurements']:
                points.append(
                    Point(f"client_{type_}")
                        .tag("client", data['client'])
                        .field("value", data['measurements'][type_])
                )

        influxdb_instance.connection.write_api().write("alma", current_app.config['INFLUXDB_V2_ORG'], points)
        return Response(status=201)

    @route("/client", methods=['GET'])
    def client_get(self):
        rep = ReportBuilder(('client',))

        for type_ in ['queue']:
            for aggregator in [('mean', 'mean()'), ('derivative', 'derivative(unit: 5s)')]:
                query = f"""from(bucket: "alma")
                |> range(start: -2m, stop: now())
                |> filter(fn: (r) => r["_measurement"] == "client_{type_}")
                |> {aggregator[1]}
                |> yield()"""
                rep.update(
                    influxdb_instance.query_api.query(query),
                    type_,
                    aggregator[0]
                )

        return jsonify(rep.get_report())

    # SITE

    @route("/site", methods=['POST'])
    @json_required
    def site_post(self):
        data = request.json

        points = []

        for type_ in ['queue']:
            if type_ in data['measurements']:
                points.append(
                    Point(f"site_{type_}")
                        .tag("site", data['site'])
                        .field("value", data['measurements'][type_])
                )

        influxdb_instance.connection.write_api().write("alma", current_app.config['INFLUXDB_V2_ORG'], points)
        return Response(status=201)

    @route("/site", methods=['GET'])
    def site_get(self):
        rep = ReportBuilder(('site',))

        for type_ in ['queue']:
            for aggregator in [('mean', 'mean()'), ('derivative', 'derivative(unit: 5s)')]:
                query = f"""from(bucket: "alma")
                |> range(start: -2m, stop: now())
                |> filter(fn: (r) => r["_measurement"] == "site_{type_}")
                |> {aggregator[1]}
                |> yield()"""
                rep.update(
                    influxdb_instance.query_api.query(query),
                    type_,
                    aggregator[0]
                )

        return jsonify(rep.get_report())