app.py

import torch
import gradio as gr
from transformers import AutoTokenizer, AutoModelForSequenceClassification
import plotly.graph_objects as go
import plotly.express as px
from plotly.subplots import make_subplots
import numpy as np
from wordcloud import WordCloud
from collections import Counter, defaultdict
import re
import json
import csv
import io
import tempfile
from datetime import datetime
import logging
from functools import lru_cache
from dataclasses import dataclass
from typing import List, Dict, Optional, Tuple
import nltk
from nltk.corpus import stopwords
import langdetect
import pandas as pd

# Configuration
@dataclass
class Config:
    MAX_HISTORY_SIZE: int = 500
    BATCH_SIZE_LIMIT: int = 30
    MAX_TEXT_LENGTH: int = 512
    CACHE_SIZE: int = 64
    
    # Supported languages and models
    SUPPORTED_LANGUAGES = {
        'auto': 'Auto Detect',
        'en': 'English',
        'zh': 'Chinese',
        'es': 'Spanish',
        'fr': 'French',
        'de': 'German',
        'sv': 'Swedish'
    }
    
    MODELS = {
        'en': "cardiffnlp/twitter-roberta-base-sentiment-latest",
        'multilingual': "cardiffnlp/twitter-xlm-roberta-base-sentiment"
    }
    
    # Color themes
    THEMES = {
        'default': {'pos': '#4CAF50', 'neg': '#F44336', 'neu': '#FF9800'},
        'ocean': {'pos': '#0077BE', 'neg': '#FF6B35', 'neu': '#00BCD4'},
        'dark': {'pos': '#66BB6A', 'neg': '#EF5350', 'neu': '#FFA726'},
        'rainbow': {'pos': '#9C27B0', 'neg': '#E91E63', 'neu': '#FF5722'}
    }

config = Config()

# Logging setup
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Initialize NLTK
try:
    nltk.download('stopwords', quiet=True)
    nltk.download('punkt', quiet=True)
    STOP_WORDS = set(stopwords.words('english'))
except:
    STOP_WORDS = {'the', 'a', 'an', 'and', 'or', 'but', 'in', 'on', 'at', 'to', 'for', 'of', 'with', 'by'}

class ModelManager:
    """Manages multiple language models"""
    def __init__(self):
        self.models = {}
        self.tokenizers = {}
        self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
        self._load_default_model()
    
    def _load_default_model(self):
        """Load the default English model"""
        try:
            model_name = config.MODELS['multilingual']  # Use multilingual as default
            self.tokenizers['default'] = AutoTokenizer.from_pretrained(model_name)
            self.models['default'] = AutoModelForSequenceClassification.from_pretrained(model_name)
            self.models['default'].to(self.device)
            logger.info(f"Default model loaded: {model_name}")
        except Exception as e:
            logger.error(f"Failed to load default model: {e}")
            raise
    
    def get_model(self, language='en'):
        """Get model for specific language"""
        if language in ['en', 'auto'] or language not in config.SUPPORTED_LANGUAGES:
            return self.models['default'], self.tokenizers['default']
        return self.models['default'], self.tokenizers['default']  # Use multilingual for all
    
    @staticmethod
    def detect_language(text: str) -> str:
        """Detect text language"""
        try:
            detected = langdetect.detect(text)
            return detected if detected in config.SUPPORTED_LANGUAGES else 'en'
        except:
            return 'en'

model_manager = ModelManager()

class HistoryManager:
    """Manages analysis history"""
    def __init__(self):
        self._history = []
    
    def add_entry(self, entry: Dict):
        self._history.append(entry)
        if len(self._history) > config.MAX_HISTORY_SIZE:
            self._history = self._history[-config.MAX_HISTORY_SIZE:]
    
    def get_history(self) -> List[Dict]:
        return self._history.copy()
    
    def clear(self) -> int:
        count = len(self._history)
        self._history.clear()
        return count
    
    def get_stats(self) -> Dict:
        if not self._history:
            return {}
        
        sentiments = [item['sentiment'] for item in self._history]
        confidences = [item['confidence'] for item in self._history]
        
        return {
            'total_analyses': len(self._history),
            'positive_count': sentiments.count('Positive'),
            'negative_count': sentiments.count('Negative'),
            'avg_confidence': np.mean(confidences),
            'languages_detected': len(set(item.get('language', 'en') for item in self._history))
        }

history_manager = HistoryManager()

class TextProcessor:
    """Enhanced text processing"""
    
    @staticmethod
    @lru_cache(maxsize=config.CACHE_SIZE)
    def clean_text(text: str, remove_punctuation: bool = True, remove_numbers: bool = False) -> str:
        """Clean text with options"""
        text = text.lower().strip()
        
        if remove_numbers:
            text = re.sub(r'\d+', '', text)
        
        if remove_punctuation:
            text = re.sub(r'[^\w\s]', '', text)
        
        words = text.split()
        cleaned_words = [w for w in words if w not in STOP_WORDS and len(w) > 2]
        return ' '.join(cleaned_words)
    
    @staticmethod
    def extract_keywords(text: str, top_k: int = 5) -> List[str]:
        """Extract key words from text"""
        cleaned = TextProcessor.clean_text(text)
        words = cleaned.split()
        word_freq = Counter(words)
        return [word for word, _ in word_freq.most_common(top_k)]

class SentimentAnalyzer:
    """Enhanced sentiment analysis"""
    
    @staticmethod
    def analyze_text(text: str, language: str = 'auto', preprocessing_options: Dict = None) -> Dict:
        """Analyze single text with language support"""
        if not text.strip():
            raise ValueError("Empty text provided")
        
        # Detect language if auto
        if language == 'auto':
            detected_lang = model_manager.detect_language(text)
        else:
            detected_lang = language
        
        # Get appropriate model
        model, tokenizer = model_manager.get_model(detected_lang)
        
        # Preprocessing options
        options = preprocessing_options or {}
        processed_text = text
        if options.get('clean_text', False):
            processed_text = TextProcessor.clean_text(
                text, 
                options.get('remove_punctuation', True),
                options.get('remove_numbers', False)
            )
        
        try:
            # Tokenize and analyze
            inputs = tokenizer(processed_text, return_tensors="pt", padding=True, 
                             truncation=True, max_length=config.MAX_TEXT_LENGTH).to(model_manager.device)
            
            with torch.no_grad():
                outputs = model(**inputs)
                probs = torch.nn.functional.softmax(outputs.logits, dim=-1).cpu().numpy()[0]
                
            # Handle different model outputs
            if len(probs) == 3:  # negative, neutral, positive
                sentiment_idx = np.argmax(probs)
                sentiment_labels = ['Negative', 'Neutral', 'Positive']
                sentiment = sentiment_labels[sentiment_idx]
                confidence = float(probs[sentiment_idx])
                
                result = {
                    'sentiment': sentiment,
                    'confidence': confidence,
                    'neg_prob': float(probs[0]),
                    'neu_prob': float(probs[1]),
                    'pos_prob': float(probs[2]),
                    'has_neutral': True
                }
            else:  # negative, positive
                pred = np.argmax(probs)
                sentiment = "Positive" if pred == 1 else "Negative"
                confidence = float(probs[pred])
                
                result = {
                    'sentiment': sentiment,
                    'confidence': confidence,
                    'neg_prob': float(probs[0]),
                    'pos_prob': float(probs[1]),
                    'neu_prob': 0.0,
                    'has_neutral': False
                }
            
            # Add metadata
            result.update({
                'language': detected_lang,
                'keywords': TextProcessor.extract_keywords(text),
                'word_count': len(text.split()),
                'char_count': len(text)
            })
            
            return result
            
        except Exception as e:
            logger.error(f"Analysis failed: {e}")
            raise

class PlotlyVisualizer:
    """Enhanced visualizations with Plotly"""
    
    @staticmethod
    def create_sentiment_gauge(result: Dict, theme: str = 'default') -> go.Figure:
        """Create an animated sentiment gauge"""
        colors = config.THEMES[theme]
        
        if result['has_neutral']:
            # Three-way gauge
            fig = go.Figure(go.Indicator(
                mode = "gauge+number+delta",
                value = result['pos_prob'] * 100,
                domain = {'x': [0, 1], 'y': [0, 1]},
                title = {'text': f"Sentiment: {result['sentiment']}"},
                delta = {'reference': 50},
                gauge = {
                    'axis': {'range': [None, 100]},
                    'bar': {'color': colors['pos'] if result['sentiment'] == 'Positive' else colors['neg']},
                    'steps': [
                        {'range': [0, 33], 'color': colors['neg']},
                        {'range': [33, 67], 'color': colors['neu']},
                        {'range': [67, 100], 'color': colors['pos']}
                    ],
                    'threshold': {
                        'line': {'color': "red", 'width': 4},
                        'thickness': 0.75,
                        'value': 90
                    }
                }
            ))
        else:
            # Two-way gauge
            fig = go.Figure(go.Indicator(
                mode = "gauge+number",
                value = result['confidence'] * 100,
                domain = {'x': [0, 1], 'y': [0, 1]},
                title = {'text': f"Confidence: {result['sentiment']}"},
                gauge = {
                    'axis': {'range': [None, 100]},
                    'bar': {'color': colors['pos'] if result['sentiment'] == 'Positive' else colors['neg']},
                    'steps': [
                        {'range': [0, 50], 'color': "lightgray"},
                        {'range': [50, 100], 'color': "gray"}
                    ]
                }
            ))
        
        fig.update_layout(height=400, font={'size': 16})
        return fig
    
    @staticmethod
    def create_probability_bars(result: Dict, theme: str = 'default') -> go.Figure:
        """Create probability bar chart"""
        colors = config.THEMES[theme]
        
        if result['has_neutral']:
            labels = ['Negative', 'Neutral', 'Positive']
            values = [result['neg_prob'], result['neu_prob'], result['pos_prob']]
            bar_colors = [colors['neg'], colors['neu'], colors['pos']]
        else:
            labels = ['Negative', 'Positive']
            values = [result['neg_prob'], result['pos_prob']]
            bar_colors = [colors['neg'], colors['pos']]
        
        fig = go.Figure(data=[
            go.Bar(x=labels, y=values, marker_color=bar_colors, text=[f'{v:.3f}' for v in values])
        ])
        
        fig.update_traces(texttemplate='%{text}', textposition='outside')
        fig.update_layout(
            title="Sentiment Probabilities",
            yaxis_title="Probability",
            height=400,
            showlegend=False
        )
        
        return fig
    
    @staticmethod
    def create_history_dashboard(history: List[Dict]) -> go.Figure:
        """Create comprehensive history dashboard"""
        if len(history) < 2:
            return go.Figure()
        
        # Create subplots
        fig = make_subplots(
            rows=2, cols=2,
            subplot_titles=['Sentiment Timeline', 'Confidence Distribution', 
                           'Language Distribution', 'Sentiment Summary'],
            specs=[[{"secondary_y": False}, {"secondary_y": False}],
                   [{"type": "pie"}, {"type": "bar"}]]
        )
        
        # Extract data
        indices = list(range(len(history)))
        pos_probs = [item['pos_prob'] for item in history]
        confidences = [item['confidence'] for item in history]
        sentiments = [item['sentiment'] for item in history]
        languages = [item.get('language', 'en') for item in history]
        
        # Sentiment timeline
        colors = ['#4CAF50' if s == 'Positive' else '#F44336' for s in sentiments]
        fig.add_trace(
            go.Scatter(x=indices, y=pos_probs, mode='lines+markers', 
                      marker=dict(color=colors, size=8),
                      name='Positive Probability'),
            row=1, col=1
        )
        
        # Confidence distribution
        fig.add_trace(
            go.Histogram(x=confidences, nbinsx=10, name='Confidence'),
            row=1, col=2
        )
        
        # Language distribution
        lang_counts = Counter(languages)
        fig.add_trace(
            go.Pie(labels=list(lang_counts.keys()), values=list(lang_counts.values()),
                   name="Languages"),
            row=2, col=1
        )
        
        # Sentiment summary
        sent_counts = Counter(sentiments)
        fig.add_trace(
            go.Bar(x=list(sent_counts.keys()), y=list(sent_counts.values()),
                   marker_color=['#4CAF50' if k == 'Positive' else '#F44336' for k in sent_counts.keys()]),
            row=2, col=2
        )
        
        fig.update_layout(height=800, showlegend=False)
        return fig

# Main application functions
def analyze_single_text(text: str, language: str, theme: str, clean_text: bool, 
                       remove_punct: bool, remove_nums: bool):
    """Enhanced single text analysis"""
    try:
        if not text.strip():
            return "Please enter text", None, None, "No analysis performed"
        
        # Map display names back to language codes
        language_map = {
            'Auto Detect': 'auto',
            'English': 'en',
            'Chinese': 'zh',
            'Spanish': 'es',
            'French': 'fr',
            'German': 'de',
            'Swedish': 'sv'
        }
        language_code = language_map.get(language, 'auto')
        
        preprocessing_options = {
            'clean_text': clean_text,
            'remove_punctuation': remove_punct,
            'remove_numbers': remove_nums
        }
        
        result = SentimentAnalyzer.analyze_text(text, language_code, preprocessing_options)
        
        # Add to history
        history_entry = {
            'text': text[:100] + '...' if len(text) > 100 else text,
            'full_text': text,
            'sentiment': result['sentiment'],
            'confidence': result['confidence'],
            'pos_prob': result['pos_prob'],
            'neg_prob': result['neg_prob'],
            'neu_prob': result.get('neu_prob', 0),
            'language': result['language'],
            'timestamp': datetime.now().isoformat()
        }
        history_manager.add_entry(history_entry)
        
        # Create visualizations
        gauge_fig = PlotlyVisualizer.create_sentiment_gauge(result, theme)
        bars_fig = PlotlyVisualizer.create_probability_bars(result, theme)
        
        # Create info text
        info_text = f"""
**Analysis Results:**
- **Sentiment:** {result['sentiment']} ({result['confidence']:.3f} confidence)
- **Language:** {result['language'].upper()}
- **Keywords:** {', '.join(result['keywords'])}
- **Stats:** {result['word_count']} words, {result['char_count']} characters
        """
        
        return info_text, gauge_fig, bars_fig, "Analysis completed successfully"
        
    except Exception as e:
        logger.error(f"Analysis failed: {e}")
        return f"Error: {str(e)}", None, None, "Analysis failed"

def get_history_stats():
    """Get history statistics"""
    stats = history_manager.get_stats()
    if not stats:
        return "No analysis history available"
    
    return f"""
**History Statistics:**
- Total Analyses: {stats['total_analyses']}
- Positive: {stats['positive_count']} | Negative: {stats['negative_count']}
- Average Confidence: {stats['avg_confidence']:.3f}
- Languages Detected: {stats['languages_detected']}
    """

def plot_history_dashboard():
    """Create history dashboard"""
    history = history_manager.get_history()
    if len(history) < 2:
        return None, "Need at least 2 analyses for dashboard"
    
    fig = PlotlyVisualizer.create_history_dashboard(history)
    return fig, f"Dashboard showing {len(history)} analyses"

def export_history_excel():
    """Export history to Excel"""
    history = history_manager.get_history()
    if not history:
        return None, "No history to export"
    
    try:
        df = pd.DataFrame(history)
        temp_file = tempfile.NamedTemporaryFile(delete=False, suffix='.xlsx')
        df.to_excel(temp_file.name, index=False)
        return temp_file.name, f"Exported {len(history)} entries to Excel"
    except Exception as e:
        return None, f"Export failed: {str(e)}"

def clear_all_history():
    """Clear analysis history"""
    count = history_manager.clear()
    return f"Cleared {count} entries from history"

# Sample data
SAMPLE_TEXTS = [
    # Auto Detect
    ["The film had its moments, but overall it felt a bit too long and lacked emotional depth."],

    # English
    ["I was completely blown away by the movie — the performances were raw and powerful, and the story stayed with me long after the credits rolled."],

    # Chinese
    ["这部电影节奏拖沓，剧情老套，完全没有让我产生任何共鸣，是一次失望的观影体验。"],

    # Spanish
    ["Una obra maestra del cine contemporáneo, con actuaciones sobresalientes, un guion bien escrito y una dirección impecable."],

    # French
    ["Je m'attendais à beaucoup mieux. Le scénario était confus, les dialogues ennuyeux, et je me suis presque endormi au milieu du film."],

    # German
    ["Der Film war ein emotionales Erlebnis mit großartigen Bildern, einem mitreißenden Soundtrack und einer Geschichte, die zum Nachdenken anregt."],

    # Swedish
    ["Filmen var en besvikelse – tråkig handling, överdrivet skådespeleri och ett slut som inte gav något avslut alls."]
]


# Gradio Interface
with gr.Blocks(theme=gr.themes.Soft(), title="Advanced Sentiment Analyzer") as demo:
    gr.Markdown("# 🎭 Multilingual Sentiment Analyzer")
    gr.Markdown("Analyze sentiment with multiple languages, themes, and advanced visualizations")
    
    with gr.Tab("📝 Single Analysis"):
        with gr.Row():
            with gr.Column(scale=2):
                text_input = gr.Textbox(
                    label="Text to Analyze",
                    placeholder="Enter your text here... (supports multiple languages)",
                    lines=4
                )
                
                with gr.Row():
                    language_select = gr.Dropdown(
                        choices=['Auto Detect', 'English', 'Chinese', 'Spanish', 'French', 'German'],
                        value='Auto Detect',
                        label="Language"
                    )
                    theme_select = gr.Dropdown(
                        choices=list(config.THEMES.keys()),
                        value='default',
                        label="Theme"
                    )
                
                with gr.Row():
                    clean_text = gr.Checkbox(label="Clean Text", value=False)
                    remove_punct = gr.Checkbox(label="Remove Punctuation", value=True)
                    remove_nums = gr.Checkbox(label="Remove Numbers", value=False)
                
                analyze_btn = gr.Button("🔍 Analyze", variant="primary", size="lg")
                
                gr.Examples(
                    examples=SAMPLE_TEXTS,
                    inputs=text_input,
                    label="Sample Texts (Multiple Languages)"
                )
            
            with gr.Column(scale=1):
                result_info = gr.Markdown("Enter text and click Analyze")
        
        with gr.Row():
            gauge_plot = gr.Plot(label="Sentiment Gauge")
            bars_plot = gr.Plot(label="Probability Distribution")
        
        status_output = gr.Textbox(label="Status", interactive=False)
    
    with gr.Tab("📊 History & Analytics"):
        with gr.Row():
            stats_btn = gr.Button("📈 Get Statistics")
            dashboard_btn = gr.Button("📊 View Dashboard")
            clear_btn = gr.Button("🗑️ Clear History", variant="stop")
        
        with gr.Row():
            export_excel_btn = gr.Button("📁 Export Excel")
        
        stats_output = gr.Markdown("Click 'Get Statistics' to view analysis history")
        dashboard_plot = gr.Plot(label="Analytics Dashboard")
        excel_file = gr.File(label="Download Excel Report")
        history_status = gr.Textbox(label="Status", interactive=False)
    
    # Event handlers
    analyze_btn.click(
        analyze_single_text,
        inputs=[text_input, language_select, theme_select, clean_text, remove_punct, remove_nums],
        outputs=[result_info, gauge_plot, bars_plot, status_output]
    )
    
    stats_btn.click(
        get_history_stats,
        outputs=stats_output
    )
    
    dashboard_btn.click(
        plot_history_dashboard,
        outputs=[dashboard_plot, history_status]
    )
    
    export_excel_btn.click(
        export_history_excel,
        outputs=[excel_file, history_status]
    )
    
    clear_btn.click(
        clear_all_history,
        outputs=history_status
    )

if __name__ == "__main__":
    demo.launch(share=True)