app.py

import streamlit as st

# Constants
BRICK_VOLUME_CFT = (9/12) * (4.5/12) * (3/12)  # in cubic feet
CEMENT_SAND_RATIO = 1 / 6  # Cement in 1:6 mortar
SAND_RATIO = 5 / 6         # Sand in 1:6 mortar
CEMENT_DENSITY_KG_PER_CFT = 1440 / 35.3147  # kg/cft approx
CEMENT_BAG_WEIGHT_KG = 50

st.set_page_config(page_title="Brick, Cement & Sand Estimator", page_icon="🏗️")
st.title("🏗️ Brick, Cement & Sand Estimation App")

st.header("📏 Room Dimensions (in feet)")
length = st.number_input("Room Length", min_value=1.0)
width = st.number_input("Room Width", min_value=1.0)
height = st.number_input("Room Height", min_value=1.0)
wall_thickness = st.number_input("Wall Thickness", value=0.75, help="Typically 0.75 feet for 9-inch walls")

st.header("🚪 Openings (Doors, Windows, Others)")
num_openings = st.number_input("Total Number of Openings", min_value=0, step=1)

openings = []
for i in range(num_openings):
    st.subheader(f"Opening #{i+1}")
    o_length = st.number_input(f"Length of Opening #{i+1} (ft)", min_value=0.0, key=f"length_{i}")
    o_height = st.number_input(f"Height of Opening #{i+1} (ft)", min_value=0.0, key=f"height_{i}")
    has_beam = st.checkbox(f"Add Beam Over Opening #{i+1}?", value=True, key=f"beam_{i}")
    openings.append({
        "length": o_length,
        "height": o_height,
        "has_beam": has_beam
    })

st.header("🧱 Estimation Result")
if st.button("Estimate Quantities"):
    # Total wall volume
    wall_area = 2 * (length + width) * height
    wall_volume = wall_area * wall_thickness

    total_opening_volume = 0
    total_beam_volume = 0

    for op in openings:
        vol = op["length"] * op["height"] * wall_thickness
        total_opening_volume += vol

        if op["has_beam"]:
            beam_length = op["length"] + 1  # 1 ft extra
            beam_volume = beam_length * 0.75 * 0.75  # 9"x9" beam in ft
            total_beam_volume += beam_volume

    net_volume = wall_volume - total_opening_volume - total_beam_volume

    # Brick calculation
    number_of_bricks = net_volume / BRICK_VOLUME_CFT
    number_of_bricks = round(number_of_bricks * 1.05)  # 5% waste

    # Mortar volume (25% of brickwork volume)
    mortar_volume = net_volume * 0.25

    # Cement and sand volumes
    cement_volume = mortar_volume * CEMENT_SAND_RATIO
    sand_volume = mortar_volume * SAND_RATIO

    # Cement in bags
    cement_bag_volume_cft = CEMENT_BAG_WEIGHT_KG / CEMENT_DENSITY_KG_PER_CFT
    cement_bags = cement_volume / cement_bag_volume_cft
    cement_bags = round(cement_bags)

    st.subheader("📊 Estimated Quantities:")
    st.write(f"🧱 **Bricks Needed:** {number_of_bricks:,} bricks")
    st.write(f"🏖️ **Sand Needed:** {sand_volume:.2f} cft")
    st.write(f"🪣 **Cement Needed:** {cement_bags} bags (50kg each)")