# Import necessary libraries
import numpy as np
import joblib  # For loading the serialized model
import pandas as pd  # For data manipulation
from flask import Flask, request, jsonify  # For creating the Flask API

# Initialize the Flask application
superkart_sales_predictor_api = Flask("Superkart sales Predictor")

# Load the trained machine learning model
model = joblib.load("superkart_price_prediction_model_v1_0.joblib")

# Define a route for the home page (GET request)
@superkart_sales_predictor_api.get('/')
def home():
    """
    This function handles GET requests to the root URL ('/') of the API.
    It returns a simple welcome message.
    """
    return "Welcome to the SuperKart sales Prediction API!"

# Define an endpoint for single sales prediction (POST request)
@superkart_sales_predictor_api.post('/v1/sksales')
def predict_sksales_price():
    """
    This function handles POST requests to the '/v1/sksales' endpoint.
    It expects a JSON payload containing property details and returns
    the predicted rental price as a JSON response.
    """
    # Get the JSON data from the request body
    sksales_data = request.get_json()

    # Extract relevant features from the JSON data
    sample = {
        'product_Weight': product_Weight,
        'product_Sugar_Content': product_Sugar_Content,
        'product_Allocated_Area': product_Allocated_Area,
        'product_Type': product_Type,
        'product_MRP': product_MRP,
        'store_Id': store_Id,
        'store_Establishment_Year': store_Establishment_Year,
        'store_Size': store_Size,
        'store_Location_City_Type': store_Location_City_Type,
        'store_Type': store_Type
    }

    # Convert the extracted data into a Pandas DataFrame
    input_data = pd.DataFrame([sample])

    # Make prediction (get log_price)
    predicted_sales_price = model.predict(input_data)[0]

    
    # The conversion above is needed as we convert the model prediction (log price) to actual price using np.exp, which returns predictions as NumPy float32 values.
    # When we send this value directly within a JSON response, Flask's jsonify function encounters a datatype error

    # Return the actual price
    return jsonify({'Predicted sales price (in dollars)': predicted_sales_price})



# Run the Flask application in debug mode if this script is executed directly
if __name__ == '__main__':
    superkart_sales_predictor_api.run(debug=True)