app.py

import gradio as gr

def time_value_of_money_calculator(capital_expenditure, annual_revenue, operating_expenditure, project_years, minimum_attractive_rate_of_return):
    capital_expenditure = float(capital_expenditure)
    annual_revenue = float(annual_revenue)
    operating_expenditure = float(operating_expenditure)
    project_years = int(project_years)
    minimum_attractive_rate_of_return = float(minimum_attractive_rate_of_return)/100
    
    cash_flows = [-capital_expenditure] + [annual_revenue - operating_expenditure] * project_years
    net_present_value = sum(cf/(1+minimum_attractive_rate_of_return)**i for i,cf in enumerate(cash_flows))
    
    cumulative_cash_flow = 0
    payback_period = 0
    for i in range(1, len(cash_flows)):
        cumulative_cash_flow += cash_flows[i]
        payback_period = i
        if cumulative_cash_flow >= capital_expenditure: break
    
    profitability_index = abs(net_present_value/capital_expenditure)*100
    project_status = "✅ PROJECT VIABLE" if net_present_value>0 else "❌ PROJECT REVIEW NEEDED"
    
    return f"""<div style='
        animation: slideInUp 0.8s ease-out, glow 2s ease-in-out infinite alternate;
        padding: 25px; 
        background: linear-gradient(145deg, #f8f9ff, #e8ecff);
        border-radius: 20px;
        border-left: 6px solid #667eea;
        box-shadow: 0 15px 35px rgba(102,126,234,0.3);
    '>
<h2 style='
    background: linear-gradient(45deg, #1e3c72, #2a5298, #667eea);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0 0 20px 0;
    font-weight: 700;
'>🧪 Time Value of Money Analysis</h2>

<div style='font-size: 16px; line-height: 1.8;'>
    <h3 style='color: #1e3c72; margin: 15px 0 10px 0;'>📊 INPUT PARAMETERS</h3>
    <table style='width: 100%; border-collapse: collapse; margin-bottom: 20px;'>
        <tr style='background: rgba(102,126,234,0.1);'><td><b>CAPEX:</b></td><td>${capital_expenditure:,.0f}</td></tr>
        <tr><td><b>REV:</b></td><td>${annual_revenue:,.0f}</td></tr>
        <tr style='background: rgba(102,126,234,0.1);'><td><b>OPEX:</b></td><td>${operating_expenditure:,.0f}</td></tr>
    </table>

    <h3 style='color: #1e3c72; margin: 20px 0 15px 0;'>🎯 KEY RESULTS</h3>
    <div style='
        display: grid; 
        grid-template-columns: 1fr 1fr; 
        gap: 15px; 
        margin-bottom: 20px;
    '>
        <div style='text-align: center; padding: 15px; background: linear-gradient(135deg, #d4f1ff, #a3d8f4); border-radius: 12px;'>
            <div style='font-size: 28px; font-weight: bold; color: #0066cc;'>${net_present_value:,.0f}</div>
            <div style='color: #0066cc; font-weight: 600;'>NPV</div>
        </div>
        <div style='text-align: center; padding: 15px; background: linear-gradient(135deg, #fff3cd, #ffeaa7); border-radius: 12px;'>
            <div style='font-size: 28px; font-weight: bold; color: #856404;'>{payback_period} yrs</div>
            <div style='color: #856404; font-weight: 600;'>PAYBACK</div>
        </div>
    </div>

    <div style='
        padding: 20px; 
        background: linear-gradient(135deg, {'#d4edda' if net_present_value>0 else '#f8d7da'}, {'#c3e6cb' if net_present_value>0 else '#f5c6cb'});
        border-radius: 15px; 
        border-left: 6px solid {'#28a745' if net_present_value>0 else '#dc3545'};
        text-align: center;
        font-size: 18px; 
        font-weight: 700;
        color: {'#155724' if net_present_value>0 else '#721c24'};
    '>{project_status}</div>

    <div style='margin-top: 25px; padding-top: 20px; border-top: 2px solid #e1e5e9; text-align: center; color: #6c757d; font-size: 14px;'>
        👨‍💼 **App Builder: M.Kamran Liaqat** | 🆔 **2k23-chE-05**
    </div>
</div>

<style>
@keyframes slideInUp {{
    0% {{ opacity: 0; transform: translateY(50px); }}
    100% {{ opacity: 1; transform: translateY(0); }}
}}
@keyframes glow {{
    0% {{ box-shadow: 0 15px 35px rgba(102,126,234,0.3); }}
    100% {{ box-shadow: 0 20px 45px rgba(102,126,234,0.5); }}
}}
</style>"""

css = """
.gradio-container {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 50%, #0f3460 100%) !important;
    min-height: 100vh;
}
.block.gradio-container > div {
    background: rgba(255,255,255,0.95) !important;
    border-radius: 25px !important;
    box-shadow: 0 25px 50px rgba(0,0,0,0.15) !important;
    border: 1px solid rgba(255,255,255,0.3) !important;
}
.gr-button {
    background: linear-gradient(45deg, #667eea 0%, #764ba2 100%) !important;
    border: none !important;
    color: white !important;
    border-radius: 15px !important;
    font-weight: 700 !important;
    font-size: 16px !important;
    box-shadow: 0 10px 25px rgba(102,126,234,0.4) !important;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94) !important;
}
.gr-button:hover {
    transform: translateY(-3px) scale(1.02) !important;
    box-shadow: 0 15px 35px rgba(102,126,234,0.6) !important;
}
.gr-number input, .gr-slider input {
    background: rgba(255,255,255,0.95) !important;
    border: 2px solid #e8ecff !important;
    border-radius: 12px !important;
    padding: 15px !important;
    font-size: 16px !important;
    transition: all 0.3s ease !important;
}
.gr-number input:focus, .gr-slider input:focus {
    border-color: #667eea !important;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.1) !important;
}
"""

with gr.Blocks(css=css, title="ChemEng TVM Calculator") as demo:
    gr.Markdown("# 🧪 Chemical Engineering TVM Calculator")
    gr.Markdown("**Professional Capital Budgeting & Economic Analysis Tool**")
    
    with gr.Row():
        with gr.Column(scale=1):
            gr.Markdown("### 💰 **Financial Inputs**")
            capital_expenditure_input = gr.Number(value=10000000, label="**CAPEX** ($)", precision=0)
            annual_revenue_input = gr.Number(value=5000000, label="**Annual Revenue** ($)", precision=0)
            operating_expenditure_input = gr.Number(value=3500000, label="**OPEX** ($)", precision=0)
        
        with gr.Column(scale=1):
            gr.Markdown("### 📈 **Project Parameters**")
            project_years_input = gr.Slider(minimum=5, maximum=30, value=15, step=1, label="**Project Years**")
            marr_input = gr.Slider(minimum=8, maximum=25, value=12, step=0.5, label="**MARR (%)**")
    
    calculate_button = gr.Button("🔬 **PERFORM ECONOMIC ANALYSIS**", variant="primary", size="lg")
    results_output = gr.Markdown()
    
    calculate_button.click(time_value_of_money_calculator, 
                          inputs=[capital_expenditure_input, annual_revenue_input, operating_expenditure_input, project_years_input, marr_input], 
                          outputs=results_output)

demo.launch()