import streamlit as st
import requests
from pathlib import Path

# ---------------------- CONFIG ----------------------
API_BASE_URL = "https://hamdy005-raij-ai.hf.space"
API_URL_TEXT = f"{API_BASE_URL}/search/text"
API_URL_IMAGE = f"{API_BASE_URL}/search/image"
API_URL_AUDIO = f"{API_BASE_URL}/search/audio"
API_URL_PRODUCT = f"{API_BASE_URL}/product"
API_URL_RANDOM = f"{API_BASE_URL}/products/random"

# ---------------------- PAGE CONFIG ----------------------
st.set_page_config(
    page_title="AI Smart Search",
    page_icon="🔎",
    layout="wide",
    initial_sidebar_state="collapsed"
)

# ---------------------- LOAD CSS ----------------------
def load_css():
    css_file = Path(__file__).parent / "styles.css"
    if css_file.exists():
        with open(css_file) as f:
            st.markdown(f"<style>{f.read()}</style>", unsafe_allow_html=True)

load_css()

# ---------------------- SESSION STATE ----------------------
if "audio_key" not in st.session_state:
    st.session_state.audio_key = 0
if "search_results" not in st.session_state:
    st.session_state.search_results = None
if "prediction_info" not in st.session_state:
    st.session_state.prediction_info = None
if "selected_product" not in st.session_state:
    st.session_state.selected_product = None

# ---------------------- HELPER FUNCTIONS ----------------------
def build_products_list(data):
    """Build products list from API response"""
    products = []
    image_urls = data.get("image_urls", [])
    prices = data.get("prices", [])
    for idx, (pid, title) in enumerate(zip(
        data.get("product_ids", []),
        data.get("titles", []),
    )):
        products.append({
            "id": pid,
            "title": title,
            "image_url": image_urls[idx] if idx < len(image_urls) else None,
            "price": prices[idx] if idx < len(prices) else None
        })
    return products

def display_products(products, prediction_info=None):
    """Display products in a grid layout"""
    
    # Show prediction info as a compact banner
    if prediction_info and prediction_info.get("type") != "text":
        if prediction_info.get("type") == "image":
            st.info(f"🖼️ **Detected Category:** {prediction_info.get('category', 'N/A')} ({prediction_info.get('confidence', 0):.1%} confidence)")
        elif prediction_info.get("type") == "audio":
            st.info(f"🎤 **Transcription:** \"{prediction_info.get('transcription', 'N/A')}\"")
    
    # Products header
    st.markdown(f"### 🛍️ {len(products)} Products Found")
    
    # Create grid layout - 4 columns for more compact display
    cols_per_row = 4
    for i in range(0, len(products), cols_per_row):
        cols = st.columns(cols_per_row)
        for j, col in enumerate(cols):
            if i + j < len(products):
                product = products[i + j]
                with col:
                    with st.container(border=True):
                        # Show image first if available
                        if product.get('image_url'):
                            try:
                                st.image(product['image_url'], width="stretch")
                            except:
                                st.markdown("🖼️ *No image*")
                        
                        # Product title (compact)
                        title = product.get('title', 'N/A')
                        display_title = title[:40] + '...' if len(title) > 40 else title
                        st.markdown(f"**{display_title}**")
                        
                        # Price
                        price = product.get('price')
                        if price:
                            st.markdown(f"<span style='color: #2ecc71; font-weight: bold;'>${price:.2f}</span>", unsafe_allow_html=True)
                        
                        # View Details button
                        if st.button("View Details", key=f"view_{product.get('id')}", type="secondary"):
                            st.session_state.selected_product = product.get('id')
                            st.rerun()


def display_product_details(product_id):
    """Display detailed product information"""
    
    # Back button
    if st.button("← Back to Results", type="secondary"):
        st.session_state.selected_product = None
        st.rerun()
    
    # Fetch product details from API
    with st.spinner("Loading product details..."):
        try:
            response = requests.get(f"{API_URL_PRODUCT}/{product_id}", timeout=30)
            if response.status_code == 200:
                product = response.json()
                
                if product.get("error"):
                    st.error("Product not found")
                    return
                
                # Layout: Image on left, details on right
                col1, col2 = st.columns([1, 2])
                
                with col1:
                    # Product images
                    images = product.get("images", [])
                    if images:
                        st.image(images[0], width="stretch")
                        # Show thumbnails if multiple images
                        if len(images) > 1:
                            thumb_cols = st.columns(min(4, len(images)))
                            for idx, img_url in enumerate(images[:4]):
                                with thumb_cols[idx]:
                                    st.image(img_url, width=80)
                    else:
                        st.markdown("🖼️ *No image available*")
                
                with col2:
                    # Product title
                    st.markdown(f"## {product.get('title', 'N/A')}")
                    
                    # SKU
                    sku = product.get('sku')
                    if sku:
                        st.caption(f"SKU: {sku}")
                    
                    st.markdown("---")
                    
                    # Price section
                    price = product.get('price')
                    old_price = product.get('old_price')
                    
                    if old_price and old_price > price:
                        discount = int((1 - price / old_price) * 100)
                        st.markdown(f"""
                        <div style='margin: 10px 0;'>
                            <span style='text-decoration: line-through; color: #888; font-size: 1.2rem;'>${old_price:.2f}</span>
                            <span style='color: #e74c3c; font-size: 1.8rem; font-weight: bold; margin-left: 10px;'>${price:.2f}</span>
                            <span style='background: #e74c3c; color: white; padding: 3px 8px; border-radius: 4px; margin-left: 10px; font-size: 0.9rem;'>-{discount}%</span>
                        </div>
                        """, unsafe_allow_html=True)
                    elif price:
                        st.markdown(f"<span style='color: #2ecc71; font-size: 1.8rem; font-weight: bold;'>${price:.2f}</span>", unsafe_allow_html=True)
                    else:
                        st.markdown("*Price not available*")
                    
                    st.markdown("---")
                    
                    # Stock status
                    stock = product.get('stock', 0)
                    if stock > 0:
                        st.success(f"✅ In Stock ({stock} available)")
                    else:
                        st.error("❌ Out of Stock")
                    
                    st.markdown("---")
                    
                    # Description
                    st.markdown("### 📝 Description")
                    description = product.get('description', 'No description available.')
                    st.write(description)
                    
                    # Tags
                    tags = product.get('tags', [])
                    if tags:
                        st.markdown("### 🏷️ Tags")
                        st.write(" • ".join(tags))
                
            else:
                st.error(f"Error loading product: {response.status_code}")
        except Exception as e:
            st.error(f"Error: {str(e)}")
            

def reset_search():
    """Reset search state"""
    st.session_state.search_results = None
    st.session_state.prediction_info = None
    st.session_state.selected_product = None


def fetch_random_products(limit=10):
    """Fetch products from API"""
    try:
        response = requests.get(API_URL_RANDOM, params={"limit": limit}, timeout=30)
        if response.status_code == 200:
            data = response.json()
            return data.get("products", [])
    except Exception as e:
        print(f"Error fetching products: {e}")
    return []


def display_random_products():
    """Display products in a grid layout"""
    st.markdown("### 🛍️ Discover Products")
    
    # Cache products in session state to avoid fetching on every rerun
    if "random_products" not in st.session_state:
        st.session_state.random_products = fetch_random_products(10)
    
    products = st.session_state.random_products
    
    if not products:
        st.info("No products available. Try searching instead!")
        return
    
    # Refresh button
    if st.button("🔄 Refresh Products", type="secondary"):
        st.session_state.random_products = fetch_random_products(10)
        st.rerun()
    
    # Create grid layout - 4 columns
    cols_per_row = 4
    for i in range(0, len(products), cols_per_row):
        cols = st.columns(cols_per_row)
        for j, col in enumerate(cols):
            if i + j < len(products):
                product = products[i + j]
                with col:
                    with st.container(border=True):
                        # Show image first if available
                        if product.get('image_url'):
                            try:
                                st.image(product['image_url'], width="stretch")
                            except:
                                st.markdown("🖼️ *No image*")
                        
                        # Product title (compact)
                        title = product.get('title', 'N/A')
                        display_title = title[:40] + '...' if len(title) > 40 else title
                        st.markdown(f"**{display_title}**")
                        
                        # Price
                        price = product.get('price')
                        if price:
                            st.markdown(f"<span style='color: #2ecc71; font-weight: bold;'>${price:.2f}</span>", unsafe_allow_html=True)
                        
                        # View Details button
                        if st.button("View Details", key=f"random_{product.get('id')}", type="secondary"):
                            st.session_state.selected_product = product.get('id')
                            st.rerun()

# ---------------------- HEADER ----------------------
st.markdown("""
<div class="main-header">
    <h1>🔎 AI Smart Search</h1>
    <p>Search by Text, Image, or Voice</p>
</div>
""", unsafe_allow_html=True)

# ---------------------- COMPACT SEARCH BAR ----------------------
# All search controls in one row
search_col1, search_col2, search_col3 = st.columns([1, 4, 1])

with search_col1:
    search_type = st.selectbox(
        "Type",
        ["📝 Text", "🖼️ Image", "🎤 Audio"],
        label_visibility="collapsed"
    )

with search_col2:
    # Dynamic input based on search type
    if search_type == "📝 Text":
        query = st.text_input(
            "Search",
            placeholder="Search for products...",
            label_visibility="collapsed"
        )
    elif search_type == "🖼️ Image":
        image_file = st.file_uploader(
            "Upload image",
            type=["png", "jpg", "jpeg"],
            label_visibility="collapsed"
        )
    else:  # Audio
        audio_col1, audio_col2 = st.columns([3, 1])
        with audio_col1:
            audio_method = st.radio(
                "Method",
                ["🎙️ Record", "📁 Upload"],
                horizontal=True,
                label_visibility="collapsed"
            )
        with audio_col2:
            language = st.selectbox(
                "Lang",
                ["en", "ar"],
                format_func=lambda x: "EN" if x == "en" else "AR",
                label_visibility="collapsed"
            )

with search_col3:
    top_k = st.selectbox(
        "Results",
        [10, 20, 30, 50],
        label_visibility="collapsed"
    )

# ---------------------- SEARCH INPUT ROW 2 (for Image/Audio) ----------------------
if search_type == "🖼️ Image" and image_file:
    preview_col, btn_col = st.columns([1, 3])
    with preview_col:
        st.image(image_file, width=100)
    with btn_col:
        search_btn = st.button("🔍 Search", type="primary")
        if search_btn:
            with st.spinner("Analyzing..."):
                try:
                    image_file.seek(0)
                    files = {"image": (image_file.name, image_file, image_file.type)}
                    response = requests.post(API_URL_IMAGE, files=files, params={"top_k": top_k}, timeout=60)
                    if response.status_code == 200:
                        data = response.json()
                        st.session_state.search_results = build_products_list(data)
                        st.session_state.prediction_info = {
                            "type": "image",
                            "category": data.get("predicted_category", "Unknown"),
                            "confidence": data.get("confidence_score", 0)
                        }
                        st.rerun()
                    else:
                        st.error(f"Error: {response.status_code}")
                except Exception as e:
                    st.error(str(e))

elif search_type == "🎤 Audio":
    audio_data = None
    audio_filename = "recording.wav"
    
    if audio_method == "🎙️ Record":
        recorded = st.audio_input("Record", key=f"rec_{st.session_state.audio_key}", label_visibility="collapsed")
        if recorded:
            audio_data = recorded
    else:
        uploaded = st.file_uploader("Upload", type=["wav", "mp3", "m4a"], key=f"up_{st.session_state.audio_key}", label_visibility="collapsed")
        if uploaded:
            audio_data = uploaded
            audio_filename = uploaded.name
    
    if audio_data:
        col1, col2 = st.columns([1, 2])
        with col1:
            st.audio(audio_data)
        with col2:
            if st.button("🔍 Search", type="primary"):
                with st.spinner("Transcribing..."):
                    try:
                        audio_data.seek(0)
                        files = {"audio": (audio_filename, audio_data, "audio/wav")}
                        response = requests.post(API_URL_AUDIO, files=files, params={"top_k": top_k, "language": language}, timeout=60)
                        if response.status_code == 200:
                            data = response.json()
                            st.session_state.search_results = build_products_list(data)
                            st.session_state.prediction_info = {
                                "type": "audio",
                                "transcription": data.get("caption", "")
                            }
                            st.session_state.audio_key += 1
                            st.rerun()
                        else:
                            st.error(f"Error: {response.status_code}")
                    except Exception as e:
                        st.error(str(e))

elif search_type == "📝 Text":
    if st.button("🔍 Search", type="primary") or (query and st.session_state.get("last_query") != query):
        if query and query.strip():
            with st.spinner("Searching..."):
                try:
                    response = requests.post(API_URL_TEXT, params={"query": query, "top_k": top_k}, timeout=30)
                    if response.status_code == 200:
                        data = response.json()
                        st.session_state.search_results = build_products_list(data)
                        st.session_state.prediction_info = {"type": "text", "query": query}
                        st.session_state.last_query = query
                        st.rerun()
                    else:
                        st.error(f"Error: {response.status_code}")
                except Exception as e:
                    st.error(str(e))

# ---------------------- CLEAR BUTTON ----------------------
if st.session_state.search_results and not st.session_state.selected_product:
    if st.button("🗑️ Clear", type="secondary"):
        reset_search()
        st.rerun()

# ---------------------- DISPLAY RESULTS ----------------------
st.markdown("---")

# Show product details if a product is selected
if st.session_state.selected_product:
    display_product_details(st.session_state.selected_product)
elif st.session_state.search_results:
    display_products(
        st.session_state.search_results,
        st.session_state.prediction_info
    )
else:
    # Show random products before any search
    display_random_products()