"""
Vera - AI Coaching Dashboard
A real-time speech emotion analysis tool for coaching sessions.
"""

import os

# Set cache directory to something writable in your Space
os.environ["HF_HOME"] = "/app/cache"
os.environ["TRANSFORMERS_CACHE"] = "/app/cache"
os.environ["XDG_CACHE_HOME"] = "/app/cache"

# Make sure it exists
os.makedirs("/app/cache", exist_ok=True)


from transformers import pipeline
classifier = pipeline("sentiment-analysis", model="distilbert-base-uncased-finetuned-sst-2-english")


import io
import wave
import pyaudio
import threading
import time
import logging
from datetime import datetime
from collections import deque
from typing import Dict, Optional, List, Tuple
from dataclasses import dataclass
from contextlib import contextmanager

from dotenv import load_dotenv
from openai import OpenAI
import streamlit as st
from transformers import pipeline
import pandas as pd
import plotly.graph_objects as go

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

load_dotenv()


@dataclass
class SentimentResult:
    """Data class for sentiment analysis results."""
    label: str
    score: float
    
    def __post_init__(self):
        """Validate sentiment result."""
        if self.label not in ["POSITIVE", "NEGATIVE", "NEUTRAL"]:
            self.label = "NEUTRAL"
        self.score = max(0.0, min(1.0, self.score))


@dataclass
class TranscriptionEntry:
    """Data class for a single transcription entry."""
    text: str
    sentiment: SentimentResult
    timestamp: datetime


class AudioConfig:
    """Configuration for audio recording."""
    def __init__(
        self,
        chunk_duration: int = 3,
        sample_rate: int = 16000,
        channels: int = 1,
        chunk_size: int = 1024,
        format: int = pyaudio.paInt16
    ):
        self.chunk_duration = chunk_duration
        self.sample_rate = sample_rate
        self.channels = channels
        self.chunk_size = chunk_size
        self.format = format


class SentimentAnalyzer:
    """Handles sentiment analysis with enhanced neutral detection."""
    
    NEUTRAL_KEYWORDS = [
        'okay', 'ok', 'fine', 'alright', 'whatever', 'maybe', 'perhaps',
        'guess', 'not sure', "don't know", 'dunno', 'meh', 'so-so',
        'neither', 'middle', 'normal', 'average', 'moderate', 'fair'
    ]
    
    CONFIDENCE_THRESHOLD = 0.8
    MIN_WORD_COUNT = 3
    
    def __init__(self, model_name: str = "distilbert-base-uncased-finetuned-sst-2-english"):
        """Initialize sentiment analyzer with specified model."""
        self.model = pipeline("sentiment-analysis", model=model_name)
    
    def analyze(self, text: str) -> SentimentResult:
        """
        Analyze sentiment of text with enhanced neutral detection.
        
        Args:
            text: Input text to analyze
            
        Returns:
            SentimentResult with label and confidence score
        """
        if not text or not text.strip():
            return SentimentResult(label="NEUTRAL", score=0.5)
        
        try:
            # Get raw sentiment from model (truncate to avoid token limit)
            result = self.model(text[:512])[0]
            label = result["label"]
            score = result["score"]
            
            # Enhanced neutral detection
            if self._should_be_neutral(text, score):
                return SentimentResult(label="NEUTRAL", score=score)
            
            return SentimentResult(label=label, score=score)
            
        except Exception as e:
            logger.error(f"Sentiment analysis error: {e}")
            return SentimentResult(label="NEUTRAL", score=0.5)
    
    def _should_be_neutral(self, text: str, score: float) -> bool:
        """Determine if text should be classified as neutral."""
        text_lower = text.lower()
        word_count = len(text.split())
        
        has_neutral_keyword = any(
            keyword in text_lower for keyword in self.NEUTRAL_KEYWORDS
        )
        
        return (
            has_neutral_keyword or
            score < self.CONFIDENCE_THRESHOLD or
            word_count < self.MIN_WORD_COUNT
        )


@st.cache_resource
def get_sentiment_analyzer() -> SentimentAnalyzer:
    """Get cached sentiment analyzer instance."""
    return SentimentAnalyzer()


class AudioTranscriber:
    """Handles audio transcription using OpenAI Whisper."""
    
    def __init__(self, client: OpenAI, audio_config: AudioConfig):
        """
        Initialize transcriber.
        
        Args:
            client: OpenAI client instance
            audio_config: Audio configuration
        """
        self.client = client
        self.audio_config = audio_config
        self._audio = pyaudio.PyAudio()
    
    def transcribe(self, audio_data: bytes) -> Optional[str]:
        """
        Transcribe audio data to text.
        
        Args:
            audio_data: Raw audio bytes
            
        Returns:
            Transcribed text or None if transcription fails
        """
        try:
            wav_buffer = self._create_wav_buffer(audio_data)
            response = self.client.audio.transcriptions.create(
                model="whisper-1",
                file=("audio.wav", wav_buffer.read(), "audio/wav"),
                language="en",
            )
            return response.text.strip() if response.text else None
            
        except Exception as e:
            logger.error(f"Transcription error: {e}")
            return None
    
    def _create_wav_buffer(self, audio_data: bytes) -> io.BytesIO:
        """Create WAV format buffer from raw audio data."""
        wav_buffer = io.BytesIO()
        with wave.open(wav_buffer, "wb") as wav_file:
            wav_file.setnchannels(self.audio_config.channels)
            wav_file.setsampwidth(
                self._audio.get_sample_size(self.audio_config.format)
            )
            wav_file.setframerate(self.audio_config.sample_rate)
            wav_file.writeframes(audio_data)
        wav_buffer.seek(0)
        return wav_buffer
    
    def cleanup(self):
        """Clean up PyAudio resources."""
        if self._audio:
            self._audio.terminate()


class CoachingDashboard:
    """Main dashboard for real-time coaching emotion analysis."""
    
    def __init__(
        self,
        chunk_duration: int = 3,
        sample_rate: int = 16000,
        max_history: int = 50
    ):
        """
        Initialize coaching dashboard.
        
        Args:
            chunk_duration: Duration of each audio chunk in seconds
            sample_rate: Audio sample rate in Hz
            max_history: Maximum number of transcriptions to keep
        """
        self.audio_config = AudioConfig(
            chunk_duration=chunk_duration,
            sample_rate=sample_rate
        )
        self.max_history = max_history
        
        # Initialize API client
        try:
            api_key = st.secrets.get("OPENAI_API_KEY") or os.getenv("OPENAI_API_KEY")
        except Exception:
            api_key = os.getenv("OPENAI_API_KEY")
        
        if not api_key:
            raise ValueError("OPENAI_API_KEY not found in environment or secrets")
        
        self.client = OpenAI(api_key=api_key)
        
        # Initialize components
        self.transcriber = AudioTranscriber(self.client, self.audio_config)
        self.sentiment_analyzer = get_sentiment_analyzer()
        
        # Audio recording state
        self.stream: Optional[pyaudio.Stream] = None
        self.is_recording = False
        self.audio_buffer_lock = threading.Lock()
        self.audio_buffer: List[bytes] = []
        
        # Session data
        self.entries: deque[TranscriptionEntry] = deque(maxlen=max_history)
        self.current_sentiment = SentimentResult(label="NEUTRAL", score=0.5)
        self.session_start: Optional[datetime] = None
    
    def start_recording(self) -> bool:
        """
        Start audio recording session.
        
        Returns:
            True if recording started successfully, False otherwise
        """
        if self.is_recording:
            logger.warning("Recording already in progress")
            return False
        
        try:
            audio = pyaudio.PyAudio()
            self.stream = audio.open(
                format=self.audio_config.format,
                channels=self.audio_config.channels,
                rate=self.audio_config.sample_rate,
                input=True,
                frames_per_buffer=self.audio_config.chunk_size,
            )
            
            self.is_recording = True
            self.session_start = datetime.now()
            
            # Start background threads
            threading.Thread(target=self._record_audio, daemon=True).start()
            threading.Thread(target=self._process_transcription, daemon=True).start()
            
            logger.info("Recording started successfully")
            return True
            
        except Exception as e:
            logger.error(f"Failed to start recording: {e}")
            self.stop_recording()
            raise
    
    def stop_recording(self):
        """Stop audio recording session."""
        if not self.is_recording:
            return
        
        self.is_recording = False
        
        if self.stream:
            try:
                self.stream.stop_stream()
                self.stream.close()
            except Exception as e:
                logger.error(f"Error closing stream: {e}")
        
        logger.info("Recording stopped")
    
    def _record_audio(self):
        """Background thread for recording audio chunks."""
        frames = []
        frames_per_chunk = int(
            self.audio_config.sample_rate * self.audio_config.chunk_duration
        )
        
        while self.is_recording:
            try:
                if not self.stream:
                    break
                
                data = self.stream.read(
                    self.audio_config.chunk_size,
                    exception_on_overflow=False
                )
                frames.append(data)
                
                # When we have enough frames, add to buffer
                if len(frames) * self.audio_config.chunk_size >= frames_per_chunk:
                    audio_chunk = b"".join(frames)
                    with self.audio_buffer_lock:
                        self.audio_buffer.append(audio_chunk)
                    frames = []
                    
            except Exception as e:
                logger.error(f"Error recording audio: {e}")
                break
    
    def _process_transcription(self):
        """Background thread for processing transcriptions."""
        while self.is_recording:
            # Get audio chunk from buffer
            audio_data = None
            with self.audio_buffer_lock:
                if self.audio_buffer:
                    audio_data = self.audio_buffer.pop(0)
            
            if audio_data:
                self._process_audio_chunk(audio_data)
            else:
                time.sleep(0.1)
    
    def _process_audio_chunk(self, audio_data: bytes):
        """Process a single audio chunk through transcription and sentiment analysis."""
        try:
            # Transcribe
            text = self.transcriber.transcribe(audio_data)
            if not text:
                return
            
            # Analyze sentiment
            sentiment = self.sentiment_analyzer.analyze(text)
            
            # Store entry
            entry = TranscriptionEntry(
                text=text,
                sentiment=sentiment,
                timestamp=datetime.now()
            )
            self.entries.append(entry)
            self.current_sentiment = sentiment
            
            logger.info(f"Processed: {text[:50]}... ({sentiment.label})")
            
        except Exception as e:
            logger.error(f"Error processing audio chunk: {e}")
    
    def get_session_duration(self) -> int:
        """Get current session duration in seconds."""
        if not self.session_start:
            return 0
        return int((datetime.now() - self.session_start).total_seconds())
    
    def get_sentiment_stats(self) -> Dict[str, int]:
        """Get count of each sentiment type."""
        stats = {"POSITIVE": 0, "NEUTRAL": 0, "NEGATIVE": 0}
        for entry in self.entries:
            stats[entry.sentiment.label] += 1
        return stats
    
    def get_recent_entries(self, n: int = 5) -> List[TranscriptionEntry]:
        """Get the n most recent transcription entries."""
        return list(self.entries)[-n:]
    
    def cleanup(self):
        """Clean up all resources."""
        self.stop_recording()
        self.transcriber.cleanup()


class DashboardUI:
    """Handles the Streamlit UI for the coaching dashboard."""
    
    COLORS = {
        "POSITIVE": "#00C853",
        "NEUTRAL": "#FFC107",
        "NEGATIVE": "#FF1744"
    }
    
    EMOJIS = {
        "POSITIVE": {
            0.95: "🥳",
            0.85: "😁",
            0.70: "😊",
            0.00: "🙂"
        },
        "NEGATIVE": {
            0.95: "😭",
            0.85: "😢",
            0.70: "😟",
            0.00: "😕"
        },
        "NEUTRAL": {
            0.60: "😐",
            0.00: "🤷"
        }
    }
    
    def __init__(self, dashboard: CoachingDashboard):
        """Initialize UI with dashboard instance."""
        self.dashboard = dashboard
    
    def render(self):
        """Render the complete dashboard UI."""
        st.set_page_config(page_title="Vera", layout="wide")
        self._inject_custom_css()
        st.title("🎯 Vera - Your Coaching Companion")
        
        self._render_sidebar()
        self._render_main_content()
        
        # Auto-refresh when recording
        if self.dashboard.is_recording:
            time.sleep(2)
            st.rerun()
    
    def _inject_custom_css(self):
        """Inject custom CSS styles."""
        st.markdown("""
        <style>
        .sentiment-box {
            padding: 30px;
            border-radius: 15px;
            text-align: center;
            font-size: 20px;
            font-weight: bold;
            margin: 20px 0;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        .transcription-card {
            border-radius: 8px;
            padding: 15px;
            margin: 10px 0;
            transition: transform 0.2s;
        }
        .transcription-card:hover {
            transform: translateX(5px);
        }
        </style>
        """, unsafe_allow_html=True)
    
    def _render_sidebar(self):
        """Render sidebar with controls and stats."""
        with st.sidebar:
            st.header("🎮 Controls")
            
            col1, col2 = st.columns(2)
            with col1:
                if st.button("▶️ Start", disabled=self.dashboard.is_recording, use_container_width=True):
                    try:
                        self.dashboard.start_recording()
                        st.rerun()
                    except Exception as e:
                        st.error(f"Failed to start: {e}")
            
            with col2:
                if st.button("⏹️ Stop", disabled=not self.dashboard.is_recording, use_container_width=True):
                    self.dashboard.stop_recording()
                    st.rerun()
            
            st.divider()
            
            # Recording status
            if self.dashboard.is_recording:
                st.success("🔴 Recording...")
                duration = self.dashboard.get_session_duration()
                st.metric("Duration", f"{duration // 60}m {duration % 60}s")
            else:
                st.info("⚪ Stopped")
            
            st.divider()
            
            # Statistics
            st.header("📊 Statistics")
            st.metric("Total Entries", len(self.dashboard.entries))
            
            if self.dashboard.entries:
                stats = self.dashboard.get_sentiment_stats()
                total = len(self.dashboard.entries)
                
                st.metric(
                    "😊 Positive",
                    f"{stats['POSITIVE']} ({stats['POSITIVE']/total*100:.0f}%)"
                )
                st.metric(
                    "😐 Neutral",
                    f"{stats['NEUTRAL']} ({stats['NEUTRAL']/total*100:.0f}%)"
                )
                st.metric(
                    "😟 Negative",
                    f"{stats['NEGATIVE']} ({stats['NEGATIVE']/total*100:.0f}%)"
                )
    
    def _render_main_content(self):
        """Render main content area."""
        col1, col2 = st.columns([2, 1])
        
        with col1:
            self._render_emotion_timeline()
        
        with col2:
            self._render_current_status()
        
        st.divider()
        self._render_recent_transcriptions()
    
    def _render_emotion_timeline(self):
        """Render emotion timeline chart."""
        st.subheader("📈 Emotion Timeline")
        
        if not self.dashboard.entries:
            st.info("Start a session to see the emotion timeline")
            return
        
        # Prepare data
        timestamps = [entry.timestamp for entry in self.dashboard.entries]
        scores = [self._sentiment_to_score(entry.sentiment) for entry in self.dashboard.entries]
        labels = [entry.sentiment.label for entry in self.dashboard.entries]
        
        # Create chart
        fig = go.Figure()
        fig.add_trace(go.Scatter(
            x=timestamps,
            y=scores,
            mode='lines+markers',
            line=dict(width=3, color='#2196F3'),
            marker=dict(
                size=12,
                color=[self.COLORS[label] for label in labels],
                line=dict(width=2, color='white')
            ),
            hovertemplate='<b>%{text}</b><br>Score: %{y:.2f}<br>%{x}<extra></extra>',
            text=labels
        ))
        
        # Add reference zones
        fig.add_hline(y=0, line_dash="dash", line_color="gray", opacity=0.5)
        fig.add_hrect(y0=0.3, y1=1, fillcolor="green", opacity=0.1, line_width=0, annotation_text="Positive")
        fig.add_hrect(y0=-0.3, y1=0.3, fillcolor="yellow", opacity=0.1, line_width=0, annotation_text="Neutral")
        fig.add_hrect(y0=-1, y1=-0.3, fillcolor="red", opacity=0.1, line_width=0, annotation_text="Negative")
        
        fig.update_layout(
            height=400,
            xaxis_title="Time",
            yaxis_title="Emotional Valence",
            yaxis=dict(range=[-1.1, 1.1]),
            showlegend=False,
            hovermode='closest'
        )
        
        st.plotly_chart(fig, use_container_width=True)
    
    def _render_current_status(self):
        """Render current emotional status."""
        st.subheader("💭 Current Status")
        
        sentiment = self.dashboard.current_sentiment
        color = self.COLORS[sentiment.label]
        emoji = self._get_emoji(sentiment)
        
        st.markdown(f"""
        <div class="sentiment-box" style="background-color: {color}; color: white;">
            <div style="font-size: 48px;">{emoji}</div>
            <div style="margin: 10px 0;">{sentiment.label}</div>
            <div style="font-size: 16px; opacity: 0.9;">
                Confidence: {sentiment.score:.0%}
            </div>
        </div>
        """, unsafe_allow_html=True)
    
    def _render_recent_transcriptions(self):
        """Render recent transcription entries."""
        st.subheader("💬 Recent Transcriptions")
        
        if not self.dashboard.entries:
            st.info("No transcriptions yet. Start recording to see results.")
            return
        
        recent = self.dashboard.get_recent_entries(5)
        
        for entry in reversed(recent):
            color = self.COLORS[entry.sentiment.label]
            time_str = entry.timestamp.strftime("%H:%M:%S")
            emoji = self._get_emoji(entry.sentiment)
            
            st.markdown(f"""
            <div class="transcription-card" style="
                background-color: {color}20;
                border-left: 5px solid {color};
            ">
                <div style="color: {color}; font-weight: bold; margin-bottom: 8px;">
                    {emoji} [{time_str}] {entry.sentiment.label} 
                    <span style="opacity: 0.8;">({entry.sentiment.score:.0%})</span>
                </div>
                <div style="font-size: 16px; color: #333;">
                    {entry.text}
                </div>
            </div>
            """, unsafe_allow_html=True)
    
    def _sentiment_to_score(self, sentiment: SentimentResult) -> float:
        """Convert sentiment to -1 to 1 scale for visualization."""
        if sentiment.label == "POSITIVE":
            return sentiment.score
        elif sentiment.label == "NEGATIVE":
            return -sentiment.score
        else:
            return 0
    
    def _get_emoji(self, sentiment: SentimentResult) -> str:
        """Get appropriate emoji for sentiment and confidence."""
        emoji_map = self.EMOJIS.get(sentiment.label, self.EMOJIS["NEUTRAL"])
        
        for threshold, emoji in sorted(emoji_map.items(), reverse=True):
            if sentiment.score >= threshold:
                return emoji
        
        return "😐"


def main():
    """Main application entry point."""
    # Initialize dashboard in session state
    if 'dashboard' not in st.session_state:
        try:
            st.session_state.dashboard = CoachingDashboard(chunk_duration=3)
        except Exception as e:
            st.error(f"Failed to initialize dashboard: {e}")
            st.stop()
    
    dashboard = st.session_state.dashboard
    
    # Render UI
    ui = DashboardUI(dashboard)
    ui.render()


if __name__ == "__main__":
    main()