app.py

import gradio as gr
import numpy as np
import pandas as pd
import joblib
import warnings
from huggingface_hub import hf_hub_download

warnings.filterwarnings("ignore")

# Load ensemble model
def load_model():
    model_path = hf_hub_download(
        repo_id="Zeyadd-Mostaffa/final_ensemble_model",
        filename="final_ensemble_model.pkl"
    )
    model = joblib.load(model_path)
    print("✅ Ensemble model loaded successfully.")
    return model

# Load scaler
def load_scaler():
    scaler_path = hf_hub_download(
        repo_id="Zeyadd-Mostaffa/final_ensemble_model",
        filename="scaler.pkl"
    )
    scaler = joblib.load(scaler_path)
    print("✅ Scaler loaded successfully.")
    return scaler

model = load_model()
scaler = load_scaler()

# Define prediction function
def predict_employee_status(
    satisfaction_level, last_evaluation, number_project,
    average_monthly_hours, time_spend_company,
    work_accident, promotion_last_5years, salary, department, threshold=0.5
):
    expected_columns = [
        'satisfaction_level', 'last_evaluation', 'number_project', 'average_monthly_hours',
        'time_spend_company', 'Work_accident', 'promotion_last_5years', 'salary',
        'satisfaction_evaluation', 'work_balance',
        'department_IT', 'department_RandD', 'department_accounting', 'department_hr',
        'department_management', 'department_marketing', 'department_product_mng',
        'department_sales', 'department_support', 'department_technical'
    ]

    department_features = {col: 0 for col in expected_columns if col.startswith("department_")}
    dept_key = f"department_{department}"
    if dept_key in department_features:
        department_features[dept_key] = 1

    satisfaction_evaluation = satisfaction_level * last_evaluation
    work_balance = average_monthly_hours / number_project

    input_data = {
        "satisfaction_level": [satisfaction_level],
        "last_evaluation": [last_evaluation],
        "number_project": [number_project],
        "average_monthly_hours": [average_monthly_hours],
        "time_spend_company": [time_spend_company],
        "Work_accident": [work_accident],
        "promotion_last_5years": [promotion_last_5years],
        "salary": [salary],
        "satisfaction_evaluation": [satisfaction_evaluation],
        "work_balance": [work_balance],
        **department_features
    }

    input_df = pd.DataFrame(input_data)

    # Ensure all expected columns exist
    for col in expected_columns:
        if col not in input_df.columns:
            input_df[col] = 0
    input_df = input_df[expected_columns]

    # Apply scaling to same numerical columns as training
    numeric_cols = [
        'satisfaction_level', 'last_evaluation',
        'average_monthly_hours', 'number_project', 'work_balance'
    ]
    input_df[numeric_cols] = scaler.transform(input_df[numeric_cols])

    try:
        prob = model.predict_proba(input_df)[0][1]
        result = "✅ Employee is likely to quit." if prob >= threshold else "✅ Employee is likely to stay."
        return f"{result} (Probability: {prob:.2%})"
    except Exception as e:
        return f"❌ Prediction error: {str(e)}"

# Gradio UI
def gradio_interface():
    interface = gr.Interface(
        fn=predict_employee_status,
        inputs=[
            gr.Number(label="Satisfaction Level (0.0 - 1.0)"),
            gr.Number(label="Last Evaluation (0.0 - 1.0)"),
            gr.Number(label="Number of Projects (1 - 10)"),
            gr.Number(label="Average Monthly Hours (80 - 320)"),
            gr.Number(label="Time Spend at Company (Years)"),
            gr.Radio([0, 1], label="Work Accident (0 = No, 1 = Yes)"),
            gr.Radio([0, 1], label="Promotion in Last 5 Years (0 = No, 1 = Yes)"),
            gr.Radio([0, 1, 2], label="Salary (0 = Low, 1 = Medium, 2 = High)"),
            gr.Dropdown(
                ['IT', 'RandD', 'accounting', 'hr', 'management',
                 'marketing', 'product_mng', 'sales', 'support', 'technical'],
                label="Department"
            ),
            gr.Slider(0.1, 0.9, value=0.5, step=0.05, label="Prediction Threshold")
        ],
        outputs="text",
        title="Employee Retention Prediction System (Voting Ensemble)",
        description="Predict whether an employee is likely to stay or quit based on their profile. Supports threshold adjustment.",
        theme="dark"
    )
    interface.launch()

gradio_interface()