Update app.py

app.py

@@ -1,53 +1,91 @@
 import gradio as gr
+import matplotlib.pyplot as plt
 
-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
+def cmda_redevelopment_fsi_calculator(
+    uds, num_owners, old_fsi, new_fsi,
+    guideline_value, construction_cost, current_area,
+    builder_share_percent
+):
+    # Step 1: Calculate built-up areas
+    old_area = old_fsi * uds
+    new_area = new_fsi * uds
+    area_gain = new_area - old_area
 
-    # Premium FSI charges
-    premium_fsi_charge = 0.4 * guideline_value * extra_area
+    # Step 2: Premium FSI
+    premium_fsi_factor = max(0, new_fsi - 2.0)
+    premium_area = premium_fsi_factor * uds
+    premium_fsi_charge = 0.4 * guideline_value * premium_area
 
-    # Total construction cost (for full 2.8x UDS build)
-    total_construction_cost = premium_fsi_area * construction_cost
+    # Step 3: Construction Cost
+    total_construction_cost = new_area * construction_cost
 
-    # Area per owner (equal split)
-    area_per_owner = premium_fsi_area / num_owners
-    uds_per_owner = uds / num_owners
+    # Step 4: Builder Share
+    builder_share_area = (builder_share_percent / 100) * new_area
+    owner_share_area = new_area - builder_share_area
+    resale_value_builder = builder_share_area * guideline_value
+    construction_cost_builder = builder_share_area * construction_cost
+    builder_profit = resale_value_builder - construction_cost_builder - premium_fsi_charge
+
+    # Step 5: Owner-wise calculations
     current_area_per_owner = current_area / num_owners
+    owner_area_per_person = owner_share_area / num_owners
+    gain_per_owner = owner_area_per_person - current_area_per_owner
 
-    # Benefit per owner
-    area_gain_per_owner = area_per_owner - current_area_per_owner
+    # Step 6: Plotting
+    fig, ax = plt.subplots(figsize=(6, 4))
+    labels = ['Old FSI Area', 'New FSI Area', 'Premium FSI Area']
+    values = [old_area, new_area, premium_area]
+    ax.bar(labels, values, edgecolor='black')
+    ax.set_ylabel("Total Area (sq.ft)")
+    ax.set_title("FSI Area Comparison")
+    plt.tight_layout()
 
     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",
+        "Old FSI Buildable Area": f"{old_area:.2f} sq.ft",
+        "New FSI Buildable Area": f"{new_area:.2f} sq.ft",
+        "Total Area Gain": f"{area_gain:.2f} sq.ft",
+        "Premium FSI Portion": f"{premium_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",
+        "Total Construction Cost (New FSI)": f"₹ {total_construction_cost:,.2f}",
+        "--- Builder Deal Analysis ---": "",
+        "Builder Share Area": f"{builder_share_area:.2f} sq.ft",
+        "Owner Share Area": f"{owner_share_area:.2f} sq.ft",
+        "Resale Value of Builder Area": f"₹ {resale_value_builder:,.2f}",
+        "Construction Cost for Builder": f"₹ {construction_cost_builder:,.2f}",
+        "Estimated Builder Profit": f"₹ {builder_profit:,.2f}",
+        "--- Owner Breakdown ---": "",
         "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"
-    }
+        "New Area per Owner": f"{owner_area_per_person:.2f} sq.ft",
+        "Net Gain per Owner": f"{gain_per_owner:.2f} sq.ft"
+    }, fig
+
 
-# Gradio interface
+# Gradio UI
 inputs = [
     gr.Number(label="Current UDS (in sq.ft)", value=450),
     gr.Number(label="Number of Owners", value=4),
+    gr.Number(label="Old FSI", value=1.5),
+    gr.Number(label="New FSI (max 2.8)", value=2.8),
     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)
+    gr.Number(label="Current Total Area (in sq.ft)", value=1800),
+    gr.Slider(label="Builder Share (%) of Redeveloped Area", value=40, minimum=0, maximum=80, step=1)
 ]
 
-outputs = gr.JSON(label="CMDA Redevelopment Report")
+outputs = [
+    gr.JSON(label="CMDA Redevelopment & Builder Analysis"),
+    gr.Plot(label="FSI Area Comparison")
+]
 
 app = gr.Interface(
-    fn=cmda_redevelopment_calculator,
+    fn=cmda_redevelopment_fsi_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."
+    title="CMDA Redevelopment Calculator with Builder Deal Estimator",
+    description=(
+        "Compare old vs new FSI, calculate premium FSI charges, construction costs, and simulate builder-owner deals. "
+        "Premium FSI is charged only beyond 2.0 FSI. Builder profit assumes resale at guideline value."
+    )
 )
 
 if __name__ == "__main__":