import os
from pathlib import Path
from dotenv import load_dotenv
import numpy as np
import tensorflow as tf

load_dotenv()

class PredictionPipeline:
    """
    A class representing a pipeline for making predictions using a pre-trained model.

    Attributes:
        filename (str): The filename of the image to predict.

    Methods:
        predict() -> int:
            Loads a pre-trained model, processes an image, and predicts its class.
    """
    def __init__(self,filename):
        """
        Initialize the PredictionPipeline class.

        Args:
            filename (str): The filename of the image to predict.
        """
        self.filename =filename
    
    def predict(self) -> int:
        """
        Perform prediction on the image specified by the filename.

        Returns:
            int: The predicted class label.
        """
        model = tf.keras.models.load_model("model.keras")
        class_labels = ['brightpixel','narrowband',
                 'narrowbanddrd','noise',
                 'squarepulsednarrowband','squiggle',
                 'squigglesquarepulsednarrowband']

        imagename = self.filename
        test_image = tf.keras.preprocessing.image.load_img(imagename, target_size = (256,256))
        test_image = tf.keras.preprocessing.image.img_to_array(test_image)
        test_image = np.expand_dims(test_image, axis = 0)
        result = np.argmax(model.predict(test_image), axis=1)
        return class_labels[int(result)]