import streamlit as st
import requests
import pandas as pd
from gtts import gTTS
import base64
from io import BytesIO
from PIL import Image
import os
import plotly.express as px

st.set_page_config(page_title="NeuroPulse AI", page_icon="🧠", layout="wide")

# Load logo
logo_path = "logo.png"
if os.path.exists(logo_path):
    st.image(logo_path, width=180)

# Session State defaults
if "review" not in st.session_state:
    st.session_state.review = ""
if "dark_mode" not in st.session_state:
    st.session_state.dark_mode = False
if "intelligence_mode" not in st.session_state:
    st.session_state.intelligence_mode = True

# Apply Dark Mode Styling
if st.session_state.dark_mode:
    st.markdown("""
        <style>
        html, body, [class*="st-"] {
            background-color: #121212;
            color: #f5f5f5;
        }
        .stTextInput > div > div > input,
        .stTextArea > div > textarea,
        .stSelectbox div div,
        .stDownloadButton > button,
        .stButton > button {
            background-color: #1e1e1e;
            color: white;
        }
        </style>
    """, unsafe_allow_html=True)

# Sidebar controls
with st.sidebar:
    st.header("⚙️ Global Settings")
    st.session_state.dark_mode = st.toggle("🌙 Dark Mode", value=st.session_state.dark_mode)
    st.session_state.intelligence_mode = st.toggle("🧠 Intelligence Mode", value=st.session_state.intelligence_mode)

    api_token = st.text_input("🔐 API Token", type="password")
    backend_url = st.text_input("🌐 Backend URL", value="http://localhost:8000")

    sentiment_model = st.selectbox("📊 Sentiment Model", [
        "distilbert-base-uncased-finetuned-sst-2-english",
        "nlptown/bert-base-multilingual-uncased-sentiment"
    ])

    industry = st.selectbox("🏭 Industry", [
        "Auto-detect", "Generic", "E-commerce", "Healthcare", "Education", "Travel", "Banking", "Insurance",
        "Gaming", "Food Delivery", "Real Estate", "Fitness", "Entertainment"
    ])

    product_category = st.selectbox("🧩 Product Category", [
        "Auto-detect", "General", "Mobile Devices", "Laptops", "Healthcare Devices", "Banking App",
        "Travel Service", "Educational Tool", "Insurance Portal", "Streaming App", "Wearables",
        "Home Appliances", "Food Apps"
    ])

    use_aspects = st.checkbox("🔬 Enable Aspect Analysis")
    use_smart_summary = st.checkbox("🧠 Smart Summary (Single)")
    use_smart_summary_bulk = st.checkbox("🧠 Smart Summary for Bulk")

    verbosity = st.radio("🗣️ Response Style", ["Brief", "Detailed"])
    follow_up = st.text_input("🔁 Follow-up Question")
    voice_lang = st.selectbox("🔈 Voice Language", ["en", "fr", "es", "de", "hi", "zh"])

# Text-to-Speech
def speak(text, lang='en'):
    tts = gTTS(text, lang=lang)
    mp3 = BytesIO()
    tts.write_to_fp(mp3)
    b64 = base64.b64encode(mp3.getvalue()).decode()
    st.markdown(f'<audio controls><source src="data:audio/mp3;base64,{b64}" type="audio/mp3"></audio>', unsafe_allow_html=True)
    mp3.seek(0)
    return mp3

tab1, tab2 = st.tabs(["🧠 Single Review", "📚 Bulk CSV"])

# --- SINGLE REVIEW ---
with tab1:
    st.title("🧠 NeuroPulse AI – Multimodal Review Analyzer")
    st.markdown("<div style='font-size:16px;color:#888;'>Minimum 50–100 words recommended.</div>", unsafe_allow_html=True)

    review = st.text_area("📝 Enter Review", value=st.session_state.review, height=180)

    col1, col2, col3 = st.columns(3)
    with col1:
        analyze = st.button("🔍 Analyze", use_container_width=True, disabled=not api_token)
    with col2:
        if st.button("🎲 Example", use_container_width=True):
            st.session_state.review = "I love this phone! Super fast performance, great battery, and smooth UI."
            st.rerun()
    with col3:
        if st.button("🧹 Clear", use_container_width=True):
            st.session_state.review = ""
            st.rerun()

    if analyze and review:
        if len(review.split()) < 50:
            st.warning("⚠️ Please enter at least 50 words.")
        else:
            with st.spinner("Analyzing..."):
                try:
                    payload = {
                        "text": review,
                        "model": sentiment_model,
                        "industry": industry,
                        "aspects": use_aspects,
                        "follow_up": follow_up,
                        "product_category": product_category,
                        "verbosity": verbosity,
                        "intelligence": st.session_state.intelligence_mode
                    }
                    headers = {"x-api-key": st.session_state.get("api_token", api_token)}
                    params = {"smart": "1"} if use_smart_summary else {}
                    res = requests.post(f"{backend_url}/analyze/", json=payload, headers=headers, params=params)

                    if res.status_code == 200:
                        data = res.json()
                        st.success("✅ Analysis Complete")
                        st.subheader("📌 Summary")
                        st.info(data["summary"])
                        st.caption(f"🧠 Summary Type: {'Smart' if use_smart_summary else 'Standard'} | {verbosity} Response")
                        st.markdown(f"**Context:** `{data['industry']}` | `{data['product_category']}` | `Web`")

                        st.subheader("🔊 Audio")
                        audio = speak(data["summary"], lang=voice_lang)
                        st.download_button("⬇️ Download Summary Audio", audio.read(), "summary.mp3", mime="audio/mp3")

                        st.metric("📊 Sentiment", data["sentiment"]["label"], delta=f"{data['sentiment']['score']:.2%}")
                        st.info(f"💢 Emotion: {data['emotion']}")

                        if data.get("aspects"):
                            st.subheader("🔍 Aspects")
                            for a in data["aspects"]:
                                st.write(f"🔹 {a['aspect']}: {a['sentiment']} ({a['score']:.2%})")

                        if data.get("follow_up"):
                            st.subheader("🔁 Follow-Up Answer")
                            st.warning(data["follow_up"])

                        if data.get("explanation"):
                            st.subheader("🧮 Explain This")
                            st.markdown(data["explanation"])
                    else:
                        st.error(f"❌ API Error {res.status_code}: {res.json().get('detail', 'Unknown error')}")

                except Exception as e:
                    st.error(f"🚫 Exception occurred: {e}")
  
# --- BULK ---
with tab2:
    st.title("📚 Bulk CSV Upload")
    st.markdown("""
        Upload a CSV with the following columns:<br>
        <code>review</code> (required), <code>industry</code>, <code>product_category</code>, <code>device</code> (optional)
    """, unsafe_allow_html=True)

    with st.expander("📄 Sample CSV"):
        with open("sample_reviews.csv", "rb") as f:
            st.download_button("⬇️ Download sample CSV", f, file_name="sample_reviews.csv")

    uploaded_file = st.file_uploader("📁 Upload your CSV", type="csv")

    if uploaded_file and api_token:
        try:
            df = pd.read_csv(uploaded_file)
            if "review" not in df.columns:
                st.error("CSV must contain a `review` column.")
            else:
                st.success(f"✅ Loaded {len(df)} reviews")
                for col in ["industry", "product_category", "device"]:
                    if col not in df.columns:
                        df[col] = ["Auto-detect"] * len(df)
                    df[col] = df[col].fillna("Auto-detect").astype(str)

                # Replace "Auto-detect" with fallback/default
                df["industry"] = df["industry"].apply(lambda x: "Generic" if x.lower() == "auto-detect" else x)
                df["product_category"] = df["product_category"].apply(lambda x: "General" if x.lower() == "auto-detect" else x)
                df["device"] = df["device"].apply(lambda x: "Web" if x.lower() == "auto-detect" else x)

                if st.button("📊 Analyze Bulk Reviews", use_container_width=True):
                    with st.spinner("Processing..."):
                        try:
                            payload = {
                                "reviews": df["review"].tolist(),
                                "model": sentiment_model,
                                "aspects": use_aspects,
                                "industry": df["industry"].tolist(),
                                "product_category": df["product_category"].tolist(),
                                "device": df["device"].tolist(),
                                "intelligence": st.session_state.intelligence_mode,
                            }
                            headers = {"x-api-key": api_token}
                            params = {"smart": "1"} if use_smart_summary_bulk else {}
                            res = requests.post(f"{backend_url}/bulk/", json=payload, headers=headers, params=params)

                            if res.status_code == 200:
                                results = pd.DataFrame(res.json()["results"])
                                st.dataframe(results)

                                if "sentiment" in results:
                                    fig = px.pie(results, names="sentiment", title="Sentiment Distribution")
                                    st.plotly_chart(fig)

                                st.download_button("⬇️ Download Results CSV", results.to_csv(index=False), "results.csv", mime="text/csv")
                            else:
                                st.error(f"❌ Bulk Error {res.status_code}: {res.json().get('detail', 'Unknown error')}")
                        except Exception as e:
                            st.error(f"🚨 Processing Error: {e}")
        except Exception as e:
            st.error(f"❌ File Read Error: {e}")