import streamlit as st

# Title of the app
st.title("Solar Energy Calculator")

# Input Section: User inputs for energy usage, costs, etc.
st.header("Input your energy usage and system parameters:")

# Average Monthly Usage in kWh
monthly_usage = st.number_input("Enter your average monthly energy usage (kWh):", min_value=0.0)

# Peak Demand
peak_demand = st.number_input("Enter your peak demand (kW):", min_value=0.0)

# Solar Panel Efficiency
solar_panel_efficiency = st.number_input("Enter the efficiency of your solar panels (0 to 100):", min_value=0.0, max_value=100.0)

# Cost of electricity per kWh (user input or fixed)
cost_per_kwh = st.number_input("Enter the cost per kWh (in your local currency):", min_value=0.0)

# Solar panel cost (in local currency per panel or total cost)
solar_panel_cost = st.number_input("Enter the cost of installing solar panels (in your local currency):", min_value=0.0)

# Average Sunlight Hours per Day
sunlight_hours = st.number_input("Enter the average sunlight hours per day:", min_value=0.0)

# Solar Panel Output
solar_panel_output = st.number_input("Enter the solar panel output (in watts, W):", min_value=0)

# Avoid ZeroDivisionError by checking input values
if solar_panel_output > 0 and sunlight_hours > 0:
    # Calculations

    # Determine Annual Energy Consumption (in kWh)
    annual_energy_consumption = monthly_usage * 12

    # Calculate Daily Energy Requirement (in kWh)
    daily_energy_requirement = annual_energy_consumption / 365

    # Solar Panel Output in kWh (daily)
    solar_panel_output_kwh = (solar_panel_output / 1000) * sunlight_hours  # Convert from watts to kWh

    # Calculate number of solar panels required to meet daily energy requirement
    num_panels_required = daily_energy_requirement / solar_panel_output_kwh

    # Cost Calculations
    total_solar_cost = num_panels_required * solar_panel_cost

    # Payback Period (years)
    annual_savings = annual_energy_consumption * cost_per_kwh
    payback_period = total_solar_cost / annual_savings

    # Output Section: Display results
    st.header("Results:")

    # Display annual energy consumption
    st.subheader(f"Annual Energy Consumption: {annual_energy_consumption:.2f} kWh")

    # Display daily energy requirement
    st.subheader(f"Daily Energy Requirement: {daily_energy_requirement:.2f} kWh")

    # Display solar panel output
    st.subheader(f"Solar Panel Output per day: {solar_panel_output_kwh:.2f} kWh")

    # Display number of panels required
    st.subheader(f"Number of Solar Panels Required: {num_panels_required:.2f} panels")

    # Display total solar system cost
    st.subheader(f"Total Solar Panel Installation Cost: {total_solar_cost:.2f} local currency")

    # Display payback period
    st.subheader(f"Payback Period: {payback_period:.2f} years")
else:
    st.warning("Please ensure that both solar panel output and sunlight hours are greater than 0.")

# Show tips for improving the app or using it effectively
st.markdown("""
- Make sure to input accurate data to get the most reliable results.
- You can adjust the efficiency, cost, and solar panel output to simulate different scenarios.
- The payback period assumes the energy savings are constant each year.
""")