import datetime

import pandas as pd
from sklearn.model_selection import cross_val_score

import participants.query_db
from features import esm, helper, proximity
from machine_learning import QUESTIONNAIRE_IDS, QUESTIONNAIRE_IDS_RENAME


class MachineLearningPipeline:
    def __init__(
        self,
        labels_questionnaire,
        labels_scale,
        data_types,
        participants_usernames=None,
        feature_names=None,
        grouping_variable=None,
    ):
        if participants_usernames is None:
            participants_usernames = participants.query_db.get_usernames(
                collection_start=datetime.date.fromisoformat("2020-08-01")
            )
        self.participants_usernames = participants_usernames
        self.labels_questionnaire = labels_questionnaire
        self.data_types = data_types

        if feature_names is None:
            self.feature_names = []
        self.df_features = pd.DataFrame()
        self.labels_scale = labels_scale
        self.df_labels = pd.DataFrame()
        self.grouping_variable = grouping_variable
        self.df_groups = pd.DataFrame()

        self.model = None
        self.validation_method = None

        self.df_esm = pd.DataFrame()
        self.df_esm_preprocessed = pd.DataFrame()
        self.df_esm_interest = pd.DataFrame()
        self.df_esm_clean = pd.DataFrame()

        self.df_proximity = pd.DataFrame()

        self.df_full_data_daily_means = pd.DataFrame()
        self.df_esm_daily_means = pd.DataFrame()
        self.df_proximity_daily_counts = pd.DataFrame()

    def get_labels(self):
        self.df_esm = esm.get_esm_data(self.participants_usernames)
        self.df_esm_preprocessed = esm.preprocess_esm(self.df_esm)
        if self.labels_questionnaire == "PANAS":
            self.df_esm_interest = self.df_esm_preprocessed[
                (
                    self.df_esm_preprocessed["questionnaire_id"]
                    == QUESTIONNAIRE_IDS.get("PANAS").get("PA")
                )
                | (
                    self.df_esm_preprocessed["questionnaire_id"]
                    == QUESTIONNAIRE_IDS.get("PANAS").get("NA")
                )
            ]
        self.df_esm_clean = esm.clean_up_esm(self.df_esm_interest)

    def get_sensor_data(self):
        if "proximity" in self.data_types:
            self.df_proximity = proximity.get_proximity_data(
                self.participants_usernames
            )
            self.df_proximity = helper.get_date_from_timestamp(self.df_proximity)
            self.df_proximity = proximity.recode_proximity(self.df_proximity)

    def aggregate_daily(self):
        self.df_esm_daily_means = (
            self.df_esm_clean.groupby(["participant_id", "date_lj", "questionnaire_id"])
            .esm_user_answer_numeric.agg("mean")
            .reset_index()
            .rename(columns={"esm_user_answer_numeric": "esm_numeric_mean"})
        )
        self.df_esm_daily_means = (
            self.df_esm_daily_means.pivot(
                index=["participant_id", "date_lj"],
                columns="questionnaire_id",
                values="esm_numeric_mean",
            )
            .reset_index(col_level=1)
            .rename(columns=QUESTIONNAIRE_IDS_RENAME)
            .set_index(["participant_id", "date_lj"])
        )
        self.df_full_data_daily_means = self.df_esm_daily_means.copy()
        if "proximity" in self.data_types:
            self.df_proximity_daily_counts = proximity.count_proximity(
                self.df_proximity, ["participant_id", "date_lj"]
            )
            self.df_full_data_daily_means = self.df_full_data_daily_means.join(
                self.df_proximity_daily_counts
            )

    def assign_columns(self):
        self.df_features = self.df_full_data_daily_means[self.feature_names]
        self.df_labels = self.df_full_data_daily_means[self.labels_scale]
        if self.grouping_variable:
            self.df_groups = self.df_full_data_daily_means[self.grouping_variable]
        else:
            self.df_groups = None

    def validate_model(self):
        if self.model is None:
            raise AttributeError(
                "Please, specify a machine learning model first, by setting the .model attribute."
            )
        if self.validation_method is None:
            raise AttributeError(
                "Please, specify a cross validation method first, by setting the .validation_method attribute."
            )
        cross_val_score(
            estimator=self.model,
            X=self.df_features,
            y=self.df_labels,
            groups=self.df_groups,
            cv=self.validation_method,
            n_jobs=-1,
        )