import streamlit as st
import pandas as pd
import numpy as np
import torch
import torch.nn as nn
import matplotlib.pyplot as plt
from sklearn.preprocessing import MinMaxScaler

# Aquí se debe pegar el código de tu aplicación

# Cargar los datos de los dos CSV
file1 = 'PARCIAL-AGUA-_2_.csv'
file2 = 'PARCIAL-AGUA-_3_.csv'

data1 = pd.read_csv(file1)
data2 = pd.read_csv(file2)

# Convertir la columna 'FECHA' a objetos datetime y filtrar por años
data1['FECHA'] = pd.to_datetime(data1['FECHA'])
data2['FECHA'] = pd.to_datetime(data2['FECHA'])

filtered_data1 = data1[data1['FECHA'].dt.year >= 2007]
filtered_data2 = data2[data2['FECHA'].dt.year >= 2007]

combined_values = np.concatenate([filtered_data1['VALOR-LS-CF-N'].values, filtered_data2['VALOR-LS-CF-N'].values]).reshape(-1, 1)

scaler = MinMaxScaler()
scaled_values = scaler.fit_transform(combined_values)

scaled_values1 = scaled_values[:len(filtered_data1)]
scaled_values2 = scaled_values[len(filtered_data1):]

def sliding_windows(data, seq_length):
    x, y = [], []
    for i in range(len(data) - seq_length):
        x.append(data[i:i + seq_length])
        y.append(data[i + seq_length])
    return np.array(x), np.array(y)

seq_length = 4
x_train, y_train = sliding_windows(scaled_values1, seq_length)
x_test, y_test = sliding_windows(scaled_values2, seq_length)

trainX = torch.Tensor(x_train)
trainY = torch.Tensor(y_train)
testX = torch.Tensor(x_test)
testY = torch.Tensor(y_test)

class LSTM(nn.Module):
    def __init__(self, input_size, hidden_size, num_layers, output_size):
        super(LSTM, self).__init__()
        self.hidden_size = hidden_size
        self.num_layers = num_layers
        self.lstm = nn.LSTM(input_size, hidden_size, num_layers, batch_first=True)
        self.fc = nn.Linear(hidden_size, output_size)

    def forward(self, x):
        h0 = torch.zeros(self.num_layers, x.size(0), self.hidden_size)
        c0 = torch.zeros(self.num_layers, x.size(0), self.hidden_size)
        out, _ = self.lstm(x, (h0, c0))
        out = self.fc(out[:, -1, :])
        return out

st.title('Predicción de Series de Tiempo')
st.sidebar.title('Parámetros del Modelo')

model_type = st.sidebar.selectbox('Selecciona el modelo', ('LSTM', 'Otro Modelo'))
num_epochs = st.sidebar.slider('Número de épocas', 100, 500, 200)
learning_rate = st.sidebar.number_input('Tasa de aprendizaje', 0.001, 0.1, 0.01, 0.001)

if model_type == 'LSTM':
    input_size = 1
    hidden_size = 50
    num_layers = 2
    output_size = 1

    model = LSTM(input_size, hidden_size, num_layers, output_size)

    criterion = nn.MSELoss()
    optimizer = torch.optim.Adam(model.parameters(), lr=learning_rate)

    if st.sidebar.button('Entrenar y Predecir'):
        for epoch in range(num_epochs):
            model.train()
            outputs = model(trainX)
            optimizer.zero_grad()
            loss = criterion(outputs, trainY)
            loss.backward()
            optimizer.step()
            if (epoch+1) % 100 == 0:
                st.write(f'Epoch [{epoch+1}/{num_epochs}], Loss: {loss.item():.4f}')

        model.eval()
        train_predict = model(trainX)
        test_predict = model(testX)

        train_predict = scaler.inverse_transform(train_predict.detach().numpy().reshape(-1, 1))
        trainY_plot = scaler.inverse_transform(trainY.numpy().reshape(-1, 1))
        test_predict = scaler.inverse_transform(test_predict.detach().numpy().reshape(-1, 1))
        testY_plot = scaler.inverse_transform(testY.numpy().reshape(-1, 1))

        fig, ax = plt.subplots(figsize=(12, 6))
        ax.plot(filtered_data1['FECHA'].values[seq_length:seq_length+len(trainY)], trainY_plot, label='Datos de entrenamiento')
        ax.plot(filtered_data1['FECHA'].values[seq_length:seq_length+len(trainY)], train_predict, label='Predicciones de entrenamiento')
        ax.plot(filtered_data2['FECHA'].values[seq_length:seq_length+len(testY)], testY_plot, label='Datos de prueba')
        ax.plot(filtered_data2['FECHA'].values[seq_length:seq_length+len(testY)], test_predict, label='Predicciones de prueba')
        ax.set_xlabel('Fecha')
        ax.set_ylabel('VALOR-LS-CF-N')
        ax.set_title('Predicciones con LSTM')
        ax.legend()
        ax.grid(True)
        st.pyplot(fig)