app.py

import streamlit as st

st.set_page_config(page_title="🏠 House Material & Cost Estimator", page_icon="🛠", layout="centered")

st.title("🏠 House Material & Cost Estimator")
st.write("Plan your building project with estimated materials and cost.")

# Inputs
house_area = st.number_input('Enter the total house area (in square feet)', min_value=100)
house_type = st.selectbox(
    'Select the house type',
    ('Single Story', 'Double Story', 'Luxury')
)

# Material ratios based on house type (per 1000 sq ft)
material_ratios = {
    "Single Story": {
        "Bricks (units)": 8000,
        "Cement (bags)": 400,
        "Sand (tons)": 15,
        "Steel (tons)": 5,
        "Gravel (tons)": 20,
        "Wood (cubic feet)": 500
    },
    "Double Story": {
        "Bricks (units)": 12000,
        "Cement (bags)": 600,
        "Sand (tons)": 22,
        "Steel (tons)": 8,
        "Gravel (tons)": 30,
        "Wood (cubic feet)": 700
    },
    "Luxury": {
        "Bricks (units)": 10000,
        "Cement (bags)": 500,
        "Sand (tons)": 20,
        "Steel (tons)": 7,
        "Gravel (tons)": 25,
        "Wood (cubic feet)": 1000
    }
}

# Basic cost estimates (example rates)
cost_per_unit = {
    "Bricks (units)": 10,    # per brick
    "Cement (bags)": 8,      # per bag
    "Sand (tons)": 50,       # per ton
    "Steel (tons)": 700,     # per ton
    "Gravel (tons)": 40,     # per ton
    "Wood (cubic feet)": 15  # per cubic foot
}

if st.button('Estimate Materials and Cost'):
    st.subheader("📦 Estimated Materials Needed:")

    factor = house_area / 1000
    total_cost = 0

    for material, base_amount in material_ratios[house_type].items():
        required = base_amount * factor
        cost = required * cost_per_unit[material]
        total_cost += cost
        
        st.write(f"- **{material}**: {required:.2f} (Cost: ${cost:,.2f})")

    st.subheader(f"💰 Total Estimated Cost: **${total_cost:,.2f}**")
    st.info("⚡ This is a rough estimate. Actual requirements and prices may vary based on location and design.")

st.markdown("---")
st.caption("Built with ❤️ using Streamlit")