import streamlit as st
import tensorflow as tf
import numpy as np
from PIL import Image
import pandas as pd
import matplotlib.pyplot as plt

# Load the trained model
model_path = "pikatchu_vs_raichu_vs_snorlax.keras"
model = tf.keras.models.load_model(model_path)

# Define the core prediction function
def predict_pokemon(image):
    # Preprocess image
    image = image.resize((150, 150))  # Resize the image to 150x150
    image = image.convert('RGB')  # Ensure image has 3 channels
    image = np.array(image)
    image = np.expand_dims(image, axis=0)  # Add batch dimension
    
    # Predict
    prediction = model.predict(image)
    
    # Apply softmax to get probabilities for each class
    probabilities = tf.nn.softmax(prediction, axis=1)
    
    # Map probabilities to Pokemon classes
    class_names = ['Pikachu', 'Raichu', 'Snorlax']
    probabilities_dict = {pokemon_class: round(float(probability), 2) for pokemon_class, probability in zip(class_names, probabilities.numpy()[0])}
    
    # Get the predicted Pokemon
    predicted_pokemon = max(probabilities_dict, key=probabilities_dict.get)
    
    return predicted_pokemon, probabilities_dict

# Streamlit interface
st.title("Pokemon Classification Tool")
st.write("To classify between Pikachu, Raichu and Snorlax.")
st.write("Please insert a picture of one of the above mentioned Pokemons")

# Upload image
uploaded_image = st.file_uploader("Choose an image...", type=["jpg", "png"])

if uploaded_image is not None:
    image = Image.open(uploaded_image)
    st.image(image, caption='Uploaded Image.', use_column_width=True)
    st.write("")
    st.write("Classifying...")
    
    predicted_pokemon, predictions = predict_pokemon(image)
    
    # Display predicted Pokemon name in bold and large font
    st.write(f"### **Predicted Pokemon: {predicted_pokemon.upper()}**")
    
    # Display predictions as a pie chart
    st.write("### Prediction Chart")
    fig, ax = plt.subplots()
    ax.pie(predictions.values(), labels=predictions.keys(), autopct='%1.1f%%', startangle=90)
    ax.set_title('Prediction Probabilities')
    ax.axis('equal')  # Equal aspect ratio ensures that pie is drawn as a circle.
    st.pyplot(fig)