# app.py
import gradio as gr

# Conversion function
def convert_units(value, conversion_type, from_unit, to_unit):
    try:
        value = float(value)
    except ValueError:
        return "Please enter a numeric value"
    
    # Weight conversions
    weight_units = {"kg": 1, "gram": 1000, "lb": 2.20462}
    if conversion_type == "Weight":
        return round(value * weight_units[to_unit] / weight_units[from_unit], 4)
    
    # Length conversions
    length_units = {"meter": 1, "cm": 100, "feet": 3.28084, "inch": 39.3701}
    if conversion_type == "Length":
        return round(value * length_units[to_unit] / length_units[from_unit], 4)
    
    # Temperature conversions
    if conversion_type == "Temperature":
        if from_unit == "Celsius" and to_unit == "Fahrenheit":
            return round((value * 9/5) + 32, 2)
        elif from_unit == "Fahrenheit" and to_unit == "Celsius":
            return round((value - 32) * 5/9, 2)
        elif from_unit == to_unit:
            return value
    
    return "Conversion not supported"

# Dropdown options
conversion_types = ["Weight", "Length", "Temperature"]
weight_units = ["kg", "gram", "lb"]
length_units = ["meter", "cm", "feet", "inch"]
temperature_units = ["Celsius", "Fahrenheit"]

# Function to get units based on type
def get_units(conversion_type):
    if conversion_type == "Weight":
        return gr.update(choices=weight_units, value="kg"), gr.update(choices=weight_units, value="gram")
    elif conversion_type == "Length":
        return gr.update(choices=length_units, value="meter"), gr.update(choices=length_units, value="cm")
    elif conversion_type == "Temperature":
        return gr.update(choices=temperature_units, value="Celsius"), gr.update(choices=temperature_units, value="Fahrenheit")

# Gradio Interface
with gr.Blocks() as demo:
    gr.Markdown("# 🌐 Unit Conversion App")
    
    conversion_type = gr.Dropdown(conversion_types, label="Conversion Type", value="Weight")
    from_unit = gr.Dropdown(weight_units, label="From Unit", value="kg")
    to_unit = gr.Dropdown(weight_units, label="To Unit", value="gram")
    value_input = gr.Textbox(label="Value to Convert", value="1")
    result_output = gr.Textbox(label="Converted Value")
    convert_button = gr.Button("Convert")
    
    # Update unit dropdowns dynamically
    conversion_type.change(fn=get_units, inputs=conversion_type, outputs=[from_unit, to_unit])
    
    # Convert on button click
    convert_button.click(fn=convert_units, inputs=[value_input, conversion_type, from_unit, to_unit], outputs=result_output)

demo.launch()