app.py

import gradio as gr

def cmda_redevelopment_calculator(uds, num_owners, guideline_value, construction_cost, current_area):
    # Calculations
    normal_fsi_area = 2.0 * uds
    premium_fsi_area = 2.8 * uds
    extra_area = 0.8 * uds  # This is the part that needs premium FSI

    # Premium FSI charges
    premium_fsi_charge = 0.4 * guideline_value * extra_area

    # Total construction cost (for full 2.8x UDS build)
    total_construction_cost = premium_fsi_area * construction_cost

    # Area per owner (equal split)
    area_per_owner = premium_fsi_area / num_owners
    uds_per_owner = uds / num_owners
    current_area_per_owner = current_area / num_owners

    # Benefit per owner
    area_gain_per_owner = area_per_owner - current_area_per_owner

    return {
        "Normal FSI Buildable Area (2.0 x UDS)": f"{normal_fsi_area:.2f} sq.ft",
        "Max Buildable Area with Premium FSI (2.8 x UDS)": f"{premium_fsi_area:.2f} sq.ft",
        "Extra Area via Premium FSI (0.8 x UDS)": f"{extra_area:.2f} sq.ft",
        "Premium FSI Charges": f"₹ {premium_fsi_charge:,.2f}",
        "Total Construction Cost (at 2.8 x UDS)": f"₹ {total_construction_cost:,.2f}",
        "Built-up Area per Owner": f"{area_per_owner:.2f} sq.ft",
        "Current Area per Owner": f"{current_area_per_owner:.2f} sq.ft",
        "Net Area Gain per Owner": f"{area_gain_per_owner:.2f} sq.ft"
    }

# Gradio interface
inputs = [
    gr.Number(label="Current UDS (in sq.ft)", value=450),
    gr.Number(label="Number of Owners", value=4),
    gr.Number(label="Guideline Value (₹/sq.ft)", value=5000),
    gr.Number(label="Construction Cost (₹/sq.ft)", value=3500),
    gr.Number(label="Current Total Area (in sq.ft)", value=1800)
]

outputs = gr.JSON(label="CMDA Redevelopment Report")

app = gr.Interface(
    fn=cmda_redevelopment_calculator,
    inputs=inputs,
    outputs=outputs,
    title="CMDA Redevelopment Calculator (Equal Share Model)",
    description="This calculator estimates redevelopment potential based on UDS, FSI rules, and premium FSI charges. Assumes equal area distribution among owners."
)

if __name__ == "__main__":
    app.launch()