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"""🧪 **Time Value of Money Analysis**

**INPUTS:**
- **CAPEX:** ${capital_expenditure:,.0f}
- **REV:** ${annual_revenue:,.0f}
- **OPEX:** ${operating_expenditure:,.0f}

**OUTPUTS:**
- **NPV:** ${net_present_value:,.0f}
- **PAYBACK:** {payback_period} years
- **PI:** {profitability_index:.1f}%
- **STATUS:** {project_status}

---
**👨‍💼 App Builder: M.Kamran Liaqat**  
**🆔 ID: 2k23-chE-05**
    """

gr.Interface(time_value_of_money_calculator, 
             [gr.Number(10000000, label="CAPEX ($)"), 
              gr.Number(5000000, label="Annual Revenue ($)"), 
              gr.Number(3500000, label="Operating Expenditure ($)"),
              gr.Slider(5,30,15, label="Project Years"),
              gr.Slider(8,20,12, label="MARR (%)")], 
             gr.Textbox(), 
             title="🧪 ChemEng TVM Calculator").launch()