import gradio as gr

def cel_fah(c):
    return (c * 1.8) + 32

def fah_cel(f):
    return (f - 32) / 1.8

def cel_kel(c):
    return c + 273.15

def kel_cel(k):
    return k - 273.15

def fah_kel(f):
    return (f - 32) / 1.8 + 273.15

def kel_fah(k):
    return (k - 273.15) * 1.8 + 32

def explain_temp(temp, unit):
    celsius = temp
    if unit == "F":
        celsius = fah_cel(temp)
    elif unit == "K":
        celsius = kel_cel(temp)

    if celsius < 10:
        return "❄️ <span style='color:#1e90ff'>It's very cold outside!</span>"
    elif 10 <= celsius < 25:
        return "🌤️ <span style='color:#2ecc71'>The weather is pleasant.</span>"
    elif 25 <= celsius < 35:
        return "☀️ <span style='color:#e67e22'>It's warm.</span>"
    else:
        return "🔥 <span style='color:#e74c3c'>It's hot!</span>"

def temperature_converter(choice, value):
    if choice == "Celsius → Fahrenheit":
        result = f"{cel_fah(value):.2f} °F"
        explain = explain_temp(value, "C")
    elif choice == "Celsius → Kelvin":
        result = f"{cel_kel(value):.2f} K"
        explain = explain_temp(value, "C")
    elif choice == "Fahrenheit → Celsius":
        converted = fah_cel(value)
        result = f"{converted:.2f} °C"
        explain = explain_temp(value, "F")
    elif choice == "Fahrenheit → Kelvin":
        converted = fah_kel(value)
        result = f"{converted:.2f} K"
        explain = explain_temp(value, "F")
    elif choice == "Kelvin → Celsius":
        converted = kel_cel(value)
        result = f"{converted:.2f} °C"
        explain = explain_temp(value, "K")
    elif choice == "Kelvin → Fahrenheit":
        converted = kel_fah(value)
        result = f"{converted:.2f} °F"
        explain = explain_temp(value, "K")
    else:
        return "⚠️ Invalid choice"
    
    return f"<b>✅ Result:</b> {result}<br><br>{explain}"

choices = [
    "Celsius → Fahrenheit",
    "Celsius → Kelvin",
    "Fahrenheit → Celsius",
    "Fahrenheit → Kelvin",
    "Kelvin → Celsius",
    "Kelvin → Fahrenheit"
]

with gr.Blocks(css="""
    body {
        background: linear-gradient(135deg, #c3ec52, #0ba29d);
    }
    .title {
        font-size: 45px;
        font-weight: bold;
        text-align: center;
        margin-bottom: 10px;
    }
    .title span {
        background: linear-gradient(90deg, #00c6ff, #0072ff);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }
    .desc {
        color: #003566;
        text-align: center;
        font-size: 20px;
        font-style: italic;
        margin-bottom: 30px;
    }
    .card {
        background: white;
        border-radius: 20px;
        padding: 30px;
        box-shadow: 0px 8px 25px rgba(0,0,0,0.15);
        margin: auto;
        width: 60%;
        transition: transform 0.3s ease;
    }
    .card:hover {
        transform: scale(1.02);
    }
    .gr-textbox textarea {
        background-color: #f0f9ff;
        color: #222;
        font-weight: bold;
        font-size: 18px;
        border-radius: 10px;
    }
    .gr-button {
        background: linear-gradient(90deg, #36d1dc, #5b86e5) !important;
        color: white !important;
        font-size: 18px !important;
        font-weight: bold !important;
        border-radius: 14px !important;
        transition: 0.3s;
    }
    .gr-button:hover {
        background: linear-gradient(90deg, #5b86e5, #36d1dc) !important;
        transform: scale(1.08);
    }
    .footer {
        margin-top: 30px;
        text-align: center;
        color: #222;
        font-size: 14px;
        font-style: italic;
    }
""" ) as demo:
    
    gr.HTML("<div class='title'>🌡️ <span>Temperature Converter</span></div>")
    gr.HTML("<div class='desc'>Convert between Celsius, Fahrenheit, and Kelvin with live explanation ✨</div>")
    
    with gr.Column(elem_classes="card"):
        choice = gr.Dropdown(choices, label="🌐 Choose Conversion")
        value = gr.Number(label="✏️ Enter Temperature")
        result = gr.HTML(label="✅ Result with Explanation")
        btn = gr.Button("🚀 Convert")
    
    btn.click(temperature_converter, inputs=[choice, value], outputs=result)
    
    gr.HTML("<div class='footer'>💡 Developed with ❤️ using Python & Gradio</div>")

demo.launch()