import pandas as pd
import tensorflow as tf
import pickle 
import plotly.express as px
import os 
import numpy as np

from stock_and import GetNewData

class Model:
    def __init__(self, stock_name, model_name) -> None:
        """Этот класс делает прогнозирования, выводит графики, рассчитывает важность признаков."""
        self.stock_name = stock_name # Название 
        self.features = ['lag_25', 'lag_34','lag_33','lag_26','lag_32','lag_31','lag_30','lag_29','lag_27','sentiment_neutral', 'lag_28',
        'sentiment_positive','sentiment_negative', 'month','day'] # Фичи для модели
        self.model_name = model_name # Название модели

        # Загрузка моделей
        if model_name == 'NN':
            self.model = tf.keras.models.load_model(f'models/nn_predict_1day_ver2_{stock_name}.h5', custom_objects={'mae': tf.keras.metrics.MeanAbsoluteError()})

        if model_name == 'LinearRegression':
            with open(os.path.join('models', f'linear_predict_1day_ver2_{stock_name}.pkl'), 'rb') as f:
                self.model = pickle.load(f)

        if model_name == 'LGB':
            with open(os.path.join('models', f'lgb_predict_1day_ver2_{stock_name}.pkl'), 'rb') as f:
                self.model = pickle.load(f)

    def generate_dataset(self, stock_name, num_day):
        """Парсим датасет, добавляем новые row для прогонза"""
        merged_df, string = GetNewData(stock_name).get_full_data() # Тут мы получаем датасет с новостями и акциями 

        # Создаем датасет с дополнительными строками 
        last_date = merged_df['DATE'].max()
        new_date_rng = pd.date_range(start=last_date + pd.Timedelta(hours=1), periods=24 * num_day , freq='H') 

        new_df = pd.DataFrame(new_date_rng, columns=['DATE'])
        new_df['month'] = new_df['DATE'].dt.month
        new_df['day'] = new_df['DATE'].dt.day
        
        for c in  self.features:
            last_value = merged_df[c].values[-24 * num_day :]
            new_df[c] = last_value

        # Объединяем датасет
        merged_df_new = pd.concat([merged_df, new_df[self.features+['DATE']]], ignore_index=True)
        return merged_df_new, string

    def predict(self, num_day):
        # Создаем прогнозы, важности признаков
        merged_df, string = self.generate_dataset(self.stock_name, num_day) # Парсим датасет

        if self.model_name == 'NN':
            importance = np.abs(self.model.layers[0].get_weights()[0])
            importance = np.mean(importance, axis=1)
            df_weighted = merged_df[self.features].ffill().bfill()[-num_day*24:] * importance

        if self.model_name == 'LinearRegression':
            df_weighted = merged_df[self.features].ffill().bfill()[-num_day*24:] * self.model.coef_

        if self.model_name == 'LGB':
            df_weighted = merged_df[self.features].ffill().bfill()[-num_day*24:] * self.model.feature_importances_

        average_values = df_weighted.mean(axis=0).abs().sort_values(ascending=False)
        average_values_filtered = average_values.drop('lag_25')
            
        total_sum = average_values_filtered.sum()
        average_values_percentage = (average_values_filtered / total_sum) * 100

        string += '\n Самые полезные признаки для прогнозов: \n'
        
        for f, v in zip(average_values_percentage.index, average_values_percentage.values):
            string += f'- {f}: важность = {v:.2f}%\n'

        if self.model_name in ['LinearRegression', 'LGB']:
            return pd.DataFrame({
                'predict': self.model.predict(merged_df[self.features].ffill().bfill().values),
                'DATE': merged_df['DATE'].values,
                'CLOSE': merged_df['CLOSE'].values
            }), string

        else:
            return pd.DataFrame({
                'predict': self.model.predict(merged_df[self.features].ffill().bfill().values)[:, 0],
                'DATE': merged_df['DATE'].values,
                'CLOSE': merged_df['CLOSE'].values
            }), string

    def plot_predict(self, predict, add_smoothing):
        predict = predict[-24*12:]

        scaling_factor = predict['CLOSE'].mean() / predict['predict'].mean()
        scaled_preds = predict['predict'] * scaling_factor

        fig = px.line(predict, x=predict.DATE, y='CLOSE', labels={'value': 'Цена'}, title='CLOSE')
        fig.add_scatter(x=predict.DATE, y=scaled_preds, mode='lines', name='Predict', opacity=0.7)

        if add_smoothing:
            smoothed_preds = pd.Series(scaled_preds).ewm(3).mean()
            fig.add_scatter(x=predict.DATE, y=smoothed_preds, mode='lines', name='Сглаженные предсказания', opacity=0.7)

        fig.update_layout(xaxis=dict(type='category'))
        return fig