app.py

import streamlit as st
from prompt_builder import build_prompt 
from model_api import query_model 
from diet_builder import build_diet_prompt

st.set_page_config(page_title="FitPlan AI", layout="wide")

# --- UI STYLING (Preserving your exact original look) ---
st.markdown("""
    <style>
    header {visibility: hidden;}
    .stApp { background: linear-gradient(135deg, #f6d365 0%, #fda085 100%); background-attachment: fixed; }
    section[data-testid="stSidebar"] { background-color: #000000 !important; }
    section[data-testid="stSidebar"] h1, section[data-testid="stSidebar"] p { color: #FFFFFF !important; }
    
    .assessment-card { 
        background-color: white !important; padding: 25px; border-radius: 15px; 
        border-left: 10px solid #004d57; color: #000000 !important; margin-bottom: 30px;
    }
    .stat-card { background: white; padding: 20px; border-radius: 15px; text-align: center; border-top: 5px solid #004d57; box-shadow: 0 4px 15px rgba(0,0,0,0.05); }
    .day-container { background-color: white !important; padding: 30px; border-radius: 25px; margin-bottom: 40px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); }
    .day-header { color: #004d57; font-size: 26px; font-weight: bold; margin-bottom: 20px; border-bottom: 2px solid #f0f2f6; padding-bottom: 15px; }
    .item-row { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; border-bottom: 1px solid #f1f1f1; }
    .item-row:last-child { border-bottom: none; }
    .ex-name { flex: 2; font-weight: 600; color: #2d3436; font-size: 18px; }
    .stat-group { display: flex; gap: 15px; flex: 1.5; justify-content: flex-end; }
    .stat-pill { text-align: center; min-width: 75px; background: #f8f9fa; padding: 6px; border-radius: 12px; }
    .stat-val { color: #004d57; font-weight: bold; font-size: 15px; display: block; }
    .stat-label { font-size: 10px; color: #636e72; text-transform: uppercase; display: block; }
    </style>
    """, unsafe_allow_html=True)

# --- NAVIGATION STATE ---
if 'page' not in st.session_state: st.session_state.page = 'dashboard'
if 'user_data' not in st.session_state: st.session_state.user_data = None
if 'workout_plan' not in st.session_state: st.session_state.workout_plan = None
if 'diet_plan' not in st.session_state: st.session_state.diet_plan = None

# --- SIDEBAR ---
with st.sidebar:
    st.markdown("# 👤 FitPlan AI")
    if st.button("📊 Dashboard", use_container_width=True): 
        st.session_state.page = 'dashboard'
        st.rerun()
    if st.button("🏋️ Workout Plan", use_container_width=True): 
        # If a plan exists, show the result, otherwise show input
        if st.session_state.workout_plan:
            st.session_state.page = 'result'
        else:
            st.session_state.page = 'input'
        st.rerun()
    if st.button("🥗 Dietary Plan", use_container_width=True): 
        st.session_state.page = 'diet'
        st.rerun()
    
    if st.session_state.workout_plan:
        st.write("---")
        if st.button("🔄 Create New Profile"):
            st.session_state.workout_plan = None
            st.session_state.diet_plan = None
            st.session_state.user_data = None
            st.session_state.page = 'input'
            st.rerun()

# --- 1. DASHBOARD PAGE ---
if st.session_state.page == 'dashboard':
    st.title("📊 Your Dashboard")
    if st.session_state.user_data:
        d = st.session_state.user_data
        col1, col2, col3 = st.columns(3)
        with col1: st.markdown(f'<div class="stat-card"><div style="font-size:24px; font-weight:bold;">{d["name"]}</div><div style="color:#636e72;">USER</div></div>', unsafe_allow_html=True)
        with col2: st.markdown(f'<div class="stat-card"><div style="font-size:24px; font-weight:bold;">{d["bmi"]:.1f}</div><div style="color:#636e72;">BMI</div></div>', unsafe_allow_html=True)
        with col3: st.markdown(f'<div class="stat-card"><div style="font-size:24px; font-weight:bold; color:{d["color"]}">{d["status"]}</div><div style="color:#636e72;">HEALTH STATUS</div></div>', unsafe_allow_html=True)
        st.write("---")
        st.success(f"Current Goal: **{d['goal']}**")
    else:
        st.warning("Go to 'Workout Plan' to generate your profile.")

# --- 2. INPUT PAGE ---
elif st.session_state.page == 'input':
    st.title("🏋️ Fitness Profile")
    c1, c2, c3 = st.columns([2, 1, 1])
    with c1: name = st.text_input("Name")
    with c2: gender = st.selectbox("Gender", ["Male", "Female", "Other"])
    with c3: age = st.number_input("Age", min_value=1, value=19)
    h, w = st.columns(2)
    with h: height = st.number_input("Height (cm)", min_value=1.0)
    with w: weight = st.number_input("Weight (kg)", min_value=1.0)
    goal = st.selectbox("Goal", ["Build Muscle", "Weight Loss", "Strength", "Flexibility"])
    level = st.selectbox("Fitness Level", ["Beginner", "Intermediate", "Advanced"])
    equip = st.multiselect("Equipment", ["Dumbbells", "Kettlebells", "Pull-up Bar", "Resistance Bands", "Yoga Mat", "No Equipment"])

    if st.button("Generate Complete Plan"):
        prompt, bmi, status, color = build_prompt(name, gender, age, height, weight, goal, level, equip)
        with st.spinner("AI is crafting your routine..."):
            st.session_state.workout_plan = query_model(prompt)
            st.session_state.user_data = {"name": name, "bmi": bmi, "status": status, "color": color, "age": age, "gender": gender, "goal": goal, "height": height, "weight": weight, "level": level}
            st.session_state.diet_plan = None 
            st.session_state.page = 'result'
            st.rerun()

# --- 3. WORKOUT RESULT (Stored Memory) ---
elif st.session_state.page == 'result':
    d = st.session_state.user_data
    st.markdown(f'<div class="assessment-card"><h2>Hello {d["name"]}</h2><p>BMI: <strong>{d["bmi"]:.2f}</strong> | <span style="color:{d["color"]}">{d["status"]}</span></p></div>', unsafe_allow_html=True)
    
    raw = st.session_state.workout_plan
    days = ["Day 1:", "Day 2:", "Day 3:", "Day 4:", "Day 5:"]
    for i in range(len(days)):
        start = raw.find(days[i])
        if start != -1:
            end = raw.find(days[i+1]) if i+1 < len(days) else len(raw)
            day_text = raw[start:end].strip()
            st.markdown(f'<div class="day-container"><div class="day-header">🔷 {days[i][:-1]}</div>', unsafe_allow_html=True)
            for line in day_text.split("\n"):
                if "|" in line:
                    parts = [p.strip() for p in line.replace("- ", "").split("|")]
                    if len(parts) == 4:
                        n, s, r, rs = parts
                        st.markdown(f'<div class="item-row"><div class="ex-name">🔥 {n}</div><div class="stat-group"><div class="stat-pill"><span class="stat-val">{s}</span><span class="stat-label">Sets</span></div><div class="stat-pill"><span class="stat-val">{r}</span><span class="stat-label">Reps</span></div><div class="stat-pill" style="background:#fff3e0;"><span class="stat-val" style="color:#e65100;">{rs}</span><span class="stat-label">Rest</span></div></div></div>', unsafe_allow_html=True)
            st.markdown('</div>', unsafe_allow_html=True)
    st.download_button("📥 Download Plan", data=raw, file_name=f"{d['name']}_Plan.txt")

# --- 4. DIETARY PAGE (Stored Memory) ---
elif st.session_state.page == 'diet':
    st.title("🥗 Dietary Plan")
    if st.session_state.user_data:
        d = st.session_state.user_data
        # Only query the model if the diet doesn't exist yet
        if not st.session_state.diet_plan:
            d_prompt = build_diet_prompt(d['name'], d['gender'], d['age'], d['height'], d['weight'], d['goal'])
            with st.spinner("Generating unique meal plan..."):
                st.session_state.diet_plan = query_model(d_prompt)
        
        raw_diet = st.session_state.diet_plan
        st.markdown('<div class="day-container"><div class="day-header">🍏 Daily Nutrition</div>', unsafe_allow_html=True)
        for line in raw_diet.split("\n"):
            if "|" in line:
                parts = [p.strip() for p in line.replace("- ", "").split("|")]
                if len(parts) == 4:
                    m_n, m_t, m_i, m_c = parts
                    st.markdown(f'<div class="item-row"><div class="ex-name">🍴 {m_n}<br><small>{m_i}</small></div><div class="stat-group"><div class="stat-pill"><span class="stat-val">{m_t}</span><span class="stat-label">Time</span></div><div class="stat-pill" style="background:#e8f5e9;"><span class="stat-val" style="color:#2e7d32;">{m_c}</span><span class="stat-label">Energy</span></div></div></div>', unsafe_allow_html=True)
        st.markdown('</div>', unsafe_allow_html=True)
    else:
        st.warning("Generate a profile in 'Workout Plan' first.")