src/streamlit_app.py

import streamlit as st

# --- PAGE CONFIGURATION ---
st.set_page_config(
    page_title="Fitness Plan AI",
    page_icon="💪",
    layout="wide",
    initial_sidebar_state="expanded",
)

# --- CUSTOM CSS FOR MODERN LOOK ---
st.markdown("""
    <style>
    /* Main background and text */
    .main {
        background-color: #0e1117;
    }
    
    /* Header styling */
    .stTitle {
        font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
        color: #00FF88; /* Neon Green */
        text-align: center;
        padding-bottom: 20px;
    }
    
    /* Sidebar styling */
    section[data-testid="stSidebar"] {
        background-color: #161b22;
        border-right: 1px solid #30363d;
    }
    
    /* Input box focus colors */
    input:focus {
        border-color: #00FF88 !important;
    }
    
    /* Custom button styling */
    div.stButton > button:first-child {
        background-color: #00FF88;
        color: #000000;
        font-weight: bold;
        border-radius: 10px;
        width: 100%;
        height: 50px;
        border: none;
        transition: 0.3s;
    }
    div.stButton > button:hover {
        background-color: #00CC6A;
        transform: scale(1.02);
    }
    </style>
    """, unsafe_allow_html=True)

# --- SIDEBAR: USER PROFILE ---
with st.sidebar:
    st.image("https://cdn-icons-png.flaticon.com/512/2936/2936886.png", width=100)
    st.title("User Profile")
    st.write("Fill in your stats to get a precise plan.")
    
    age = st.number_input("Age", min_value=10, max_value=100, value=25)
    gender = st.radio("Gender", ["Male", "Female", "Other"], horizontal=True)
    weight = st.number_input("Weight (kg)", min_value=30.0, max_value=250.0, value=70.0)
    height = st.number_input("Height (cm)", min_value=100, max_value=250, value=175)
    
    st.divider()
    experience = st.select_slider(
        "Fitness Level",
        options=["Beginner", "Intermediate", "Advanced"]
    )

# --- MAIN PAGE AREA ---
st.title("💪 Fitness Plan AI")
st.markdown("### Personalized Fitness Plan Generator")

# Top row of inputs
col1, col2 = st.columns(2)

with col1:
    goal = st.selectbox(
        "What is your primary goal?",
        ['Weight Loss', 'Build Muscle', 'Strength Gaining', 'Flexibility', 'Abs Building'],
        index=1
    )
    st.info(f"Targeting: **{goal}**")

with col2:
    activity_level = st.selectbox(
        "Current Activity Level",
        ["Sedentary", "Lightly Active", "Moderately Active", "Very Active"]
    )
    equipment = st.multiselect(
        "Available Equipment",
        ["Full Gym", "Dumbbells", "Resistance Bands", "Bodyweight Only"],
        default=["Bodyweight Only"]
    )

# Generate Button
if st.button("Generate My AI Fitness Plan"):
    with st.spinner("Analyzing your stats and crafting your plan..."):
        # This is where your AI logic would go. 
        # For now, we show a professional placeholder layout.
        st.success(f"Generated a {goal} plan for a {experience} level athlete!")
        
        tab1, tab2, tab3 = st.tabs(["📅 Weekly Schedule", "🥗 Nutrition Guide", "💡 Pro Tips"])
        
        with tab1:
            st.markdown("#### Your 7-Day Workout Routine")
            # Example layout for the generated plan
            st.table({
                "Day": ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
                "Focus": ["Upper Body", "Lower Body", "Rest", "Cardio", "Full Body", "Active Recovery", "Rest"],
                "Duration": ["45 min", "50 min", "-", "30 min", "60 min", "20 min", "-"]
            })
            
        with tab2:
            st.markdown("#### Recommended Daily Macros")
            m1, m2, m3 = st.columns(3)
            m1.metric("Protein", "160g")
            m2.metric("Carbs", "210g")
            m3.metric("Fats", "65g")
            st.info("Estimated Daily Calories: **2,150 kcal**")
            
        with tab3:
            st.write("1. **Stay Hydrated:** Drink at least 3L of water.")
            st.write("2. **Sleep:** Aim for 7-9 hours for muscle recovery.")
            st.write("3. **Consistency:** Stick to the plan for 4 weeks to see results.")

# --- FOOTER ---
st.markdown("---")
st.caption("Powered by AI • Optimized for your health.")