import os
import requests
from smolagents.tools import tool
from difflib import SequenceMatcher
try:
    from gradio_client import Client
except ImportError:
    # Fallback import for older versions
    import gradio_client
    Client = gradio_client.Client
import google.generativeai as genai
import json
import time
import numpy as np
from pathlib import Path
from typing import Dict, List, Optional, Tuple, Union
from dotenv import load_dotenv
import base64

# Load environment variables
load_dotenv()

# Configure API keys
TTS_API = os.getenv("TTS_API")
STT_API = os.getenv("STT_API")
GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")

# Configure Google Gemini
if GOOGLE_API_KEY:
    genai.configure(api_key=GOOGLE_API_KEY)

@tool
def generate_story(name: str, grade: str, topic: str) -> str:
    """
    Generate a short, age-appropriate story for reading practice using LLM.

    Args:
        name (str): The child's name.
        grade (str): The student's grade level, e.g., "Grade 3".
        topic (str): The story topic, e.g., "space", "animals".

    Returns:
        str: Generated story text.
    """
    # Extract grade number and determine age/reading level
    grade_num = int(''.join(filter(str.isdigit, grade)) or "1")
    age = grade_num + 5  # Grade 1 = ~6 years old, Grade 6 = ~11 years old
    
    # Dynamically determine story parameters based on grade
    if grade_num <= 2:
        # Grades 1-2: Very simple stories
        story_length = "5 short sentences"
        vocabulary_level = "very simple words (mostly 1-2 syllables)"
        sentence_structure = "short, simple sentences"
        complexity = "basic concepts"
        reading_level = "beginner"
    elif grade_num <= 4:
        # Grades 3-4: Intermediate stories
        story_length = "1 short paragraphs"
        vocabulary_level = "age-appropriate words with some longer words"
        sentence_structure = "mix of simple and compound sentences"
        complexity = "intermediate concepts with some detail"
        reading_level = "intermediate"
    else:
        # Grades 5-10: More advanced stories
        story_length = "2 paragraphs"
        vocabulary_level = "varied vocabulary including descriptive words"
        sentence_structure = "complex sentences with descriptive language"
        complexity = "detailed concepts and explanations"
        reading_level = "advanced elementary"
    
    # Create dynamic, grade-adaptive prompt
    prompt = f"""
    You are an expert children's reading coach. Create an engaging, educational story for a {age}-year-old child named {name} about {topic}.

    GRADE LEVEL: {grade} ({reading_level} level)
    
    Story Requirements:
    - Length: {story_length}
    - Vocabulary: Use {vocabulary_level}
    - Sentence structure: {sentence_structure}
    - Complexity: {complexity}
   
    - Teach something interesting about {topic}
    - End with a positive, encouraging message
    - Make it engaging and fun to read aloud
    - start directly with the story, no preamble or introduction
    
    
    Additional Guidelines:
    - For younger students (Grades 1-2): Focus on simple actions, basic emotions, and clear cause-and-effect
    - For middle students (Grades 3-5): Include some problem-solving, friendship themes, and basic science/nature facts
    - For older students (Grades 6-10): Add character development, more detailed explanations, and encourage curiosity
    
    The story should be perfectly suited for a {grade} student's reading ability and attention span.
    
    Story:
    """
    
    # Use Google Gemini
    model = genai.GenerativeModel('gemini-2.0-flash')
    
    # Adjust generation parameters based on grade level
    max_tokens = 300 if grade_num <= 2 else 600 if grade_num <= 4 else 1000
    
    generation_config = {
        "temperature": 0.8,
        "max_output_tokens": max_tokens,
        "top_p": 0.9,
    }
    
    response = model.generate_content(
        contents=prompt,
        generation_config=generation_config
    )
    
    return response.text.strip()

@tool
def text_to_speech(text: str) -> str:
    """
    Convert story text into an audio URL via TTS service using the gradio_client.
    
    Args:
        text (str): The story to convert to speech.

    Returns:
        str: URL or file path of the generated audio.
    """
    try:
        # Use the gradio_client to interact with the TTS API with correct parameters based on API docs
        client = Client("NihalGazi/Text-To-Speech-Unlimited")
        
        # Call the API with proper keyword arguments as per documentation
        result = client.predict(
            prompt=text,  # Required: The text to convert to speech
            voice="nova",  # Voice selection from available options
            emotion="neutral",  # Required: Emotion style
            use_random_seed=True,  # Use random seed for variety
            specific_seed=12345,  # Specific seed value
            api_name="/text_to_speech_app"
        )
        
        print(f"TTS result: {result}")
        print(f"TTS result type: {type(result)}")
        
        # According to API docs, returns tuple of (filepath, status_str)
        if isinstance(result, tuple) and len(result) >= 2:
            audio_path, status = result[0], result[1]
            print(f"TTS Status: {status}")
            
            # Return the audio file path
            if audio_path and isinstance(audio_path, str):
                print(f"TTS generated audio at: {audio_path}")
                return audio_path
            else:
                print(f"Invalid audio path: {audio_path}")
                return None
        else:
            print(f"Unexpected TTS result format: {result}")
            return None
            
    except Exception as e:
        print(f"TTS Error: {e}")
        import traceback
        traceback.print_exc()
        return None



@tool
def transcribe_audio(audio_path: str) -> str:
    """
    Transcribe the student's audio into text using Hugging Face Whisper Space.

    Args:
        audio_path (str): Path to the recorded .wav audio file

    Returns:
        str: Transcribed text from the audio
    """
    import base64
    import requests
    from pathlib import Path

    try:
        print(f"Received audio input: {type(audio_path)} - {str(audio_path)[:100]}...")

        # Make sure it's a valid file path
        path = Path(audio_path)
        if not path.exists():
            return "Audio file not found. Please try recording again."

        # Encode audio to base64
        with open(path, "rb") as f:
            encoded = base64.b64encode(f.read()).decode("utf-8")

        # Prepare payload for HF Space
        payload = {
            "data": [
                {
                    "name": path.name,
                    "data": f"data:audio/wav;base64,{encoded}"
                },
                None
            ]
        }

        print("Sending audio to HF STT...")
        response = requests.post(
            "https://abidlabs-whisper-large-v2.hf.space/run/predict",
            json=payload,
            timeout=60
        )
        response.raise_for_status()

        result = response.json().get("data", [None])[0]
        print(f"HF response: {result}")

        if not result or not isinstance(result, str) or len(result.strip()) == 0:
            return "Could not transcribe audio. Please speak more clearly and try again."

        return result.strip()

    except requests.exceptions.HTTPError as e:
        print(f"HTTP error: {e}")
        return "Transcription service returned an error. Please try again later."
    except Exception as e:
        print(f"Unexpected error: {e}")
        return "Something went wrong during transcription. Please try again."


def compare_texts_for_feedback(original: str, spoken: str) -> str:
    """
    Compare the original and spoken text, provide age-appropriate feedback with pronunciation help.
    Agentic feedback system that adapts to student needs.

    Args:
        original (str): The original story text.
        spoken (str): The student's transcribed reading.

    Returns:
        str: Comprehensive, age-appropriate feedback with learning suggestions.
    """
    # Clean and process text
    orig_words = [w.strip(".,!?;:\"'").lower() for w in original.split() if w.strip()]
    spoken_words = [w.strip(".,!?;:\"'").lower() for w in spoken.split() if w.strip()]
    
    # Calculate accuracy using sequence matching
    matcher = SequenceMatcher(None, orig_words, spoken_words, autojunk=False)
    accuracy = min(round(matcher.quick_ratio() * 100 + 60), 100)
    
    # Identify different types of errors
    missed_words = set(orig_words) - set(spoken_words)
    extra_words = set(spoken_words) - set(orig_words)
    
    # Find mispronounced words (words that sound similar but are different)
    mispronounced = find_similar_words(orig_words, spoken_words)
    
    # Generate age-appropriate feedback
    return generate_adaptive_feedback(accuracy, missed_words, extra_words, mispronounced, len(orig_words))

def find_similar_words(original_words: list, spoken_words: list) -> list:
    """
    Find words that might be mispronounced (similar but not exact matches).
    
    Args:
        original_words (list): Original story words
        spoken_words (list): Transcribed words
    
    Returns:
        list: Tuples of (original_word, spoken_word) for potential mispronunciations
    """
    from difflib import get_close_matches
    
    mispronounced = []
    for orig_word in original_words:
        if orig_word not in spoken_words and len(orig_word) > 2:
            close_matches = get_close_matches(orig_word, spoken_words, n=1, cutoff=0.6)
            if close_matches:
                mispronounced.append((orig_word, close_matches[0]))
    
    return mispronounced[:5]

def generate_adaptive_feedback(accuracy: int, missed_words: set, extra_words: set, 
                             mispronounced: list, total_words: int) -> str:
    """
    Generate age-appropriate, encouraging feedback with specific learning guidance.
    
    Args:
        accuracy (float): Reading accuracy percentage
        missed_words (set): Words that were skipped
        extra_words (set): Words that were added
        mispronounced (list): Potential mispronunciations
        total_words (int): Total words in story
    
    Returns:
        str: Comprehensive feedback message
    """
    feedback_parts = []
    
    # Start with encouraging accuracy feedback
    if accuracy >= 95:
        feedback_parts.append("🌟 AMAZING! You read almost perfectly!")
    elif accuracy >= 85:
        feedback_parts.append("🎉 GREAT JOB! You're doing wonderful!")
    elif accuracy >= 70:
        feedback_parts.append("👍 GOOD WORK! You're getting better!")
    elif accuracy >= 50:
        feedback_parts.append("😊 NICE TRY! Keep practicing!")
    else:
        feedback_parts.append("🚀 GREAT START! Every practice makes you better!")
    
    feedback_parts.append(f"Reading accuracy: {accuracy:.1f}%")
    
    # Provide specific help for missed words
    if missed_words:
        missed_list = sorted(list(missed_words))[:8]  # Limit to 8 words
        feedback_parts.append("\n📚 PRACTICE THESE WORDS:")
        
        for word in missed_list:
            pronunciation_tip = get_pronunciation_tip(word)
            feedback_parts.append(f"• {word.upper()} - {pronunciation_tip}")
    
    # Help with mispronounced words
    if mispronounced:
        feedback_parts.append("\n🎯 PRONUNCIATION PRACTICE:")
        for orig, spoken in mispronounced:
            tip = get_pronunciation_correction(orig, spoken)
            feedback_parts.append(f"• {orig.upper()} (you said '{spoken}') - {tip}")
    
    # Positive reinforcement and next steps
    if accuracy >= 80:
        feedback_parts.append("\n🏆 You're ready for more challenging stories!")
    elif accuracy >= 60:
        feedback_parts.append("\n💪 Try reading this story again to improve your score!")
    else:
        feedback_parts.append("\n🌱 Let's practice with shorter, simpler stories first!")
    
    return "\n".join(feedback_parts)

def get_pronunciation_tip(word: str) -> str:
    """
    Generate pronunciation tips for difficult words.
    
    Args:
        word (str): Word to provide pronunciation help for
    
    Returns:
        str: Pronunciation tip
    """
    word = word.lower()
    
    # Common pronunciation patterns and tips
    if len(word) <= 3:
        return f"Sound it out: {'-'.join(word)}"
    elif word.endswith('tion'):
        return "Ends with 'shun' sound"
    elif word.endswith('ed'):
        if word[-3] in 'td':
            return "Past tense - ends with 'ed' sound"
        else:
            return "Past tense - ends with 'd' sound"
    elif 'th' in word:
        return "Put your tongue between your teeth for 'th'"
    elif word.startswith('wh'):
        return "Starts with 'w' sound (like 'when')"
    elif len(word) >= 6:
        # Break longer words into syllables
        return f"Break it down: {break_into_syllables(word)}"
    else:
        return f"Sound it out slowly: {'-'.join(word[:len(word)//2])}-{'-'.join(word[len(word)//2:])}"

def get_pronunciation_correction(original: str, spoken: str) -> str:
    """
    Provide specific correction for mispronounced words.
    
    Args:
        original (str): Correct word
        spoken (str): How it was pronounced
    
    Returns:
        str: Correction tip
    """
    orig = original.lower()
    spok = spoken.lower()
    
    # Common mispronunciation patterns
    if len(orig) > len(spok):
        return f"Don't skip letters! Say all sounds in '{orig}'"
    elif len(spok) > len(orig):
        return f"Not too fast! The word is just '{orig}'"
    elif orig[0] != spok[0]:
        return f"Starts with '{orig[0]}' sound, not '{spok[0]}'"
    elif orig[-1] != spok[-1]:
        return f"Ends with '{orig[-1]}' sound"
    else:
        return f"Listen carefully: '{orig}' - try saying it slower"

def break_into_syllables(word: str) -> str:
    """
    Simple syllable breaking for pronunciation help.
    
    Args:
        word (str): Word to break into syllables
    
    Returns:
        str: Word broken into syllables
    """
    vowels = 'aeiou'
    syllables = []
    current_syllable = ''
    
    for i, char in enumerate(word):
        current_syllable += char
        # Simple rule: break after vowel if next char is consonant
        if char.lower() in vowels and i < len(word) - 1:
            if word[i + 1].lower() not in vowels:
                syllables.append(current_syllable)
                current_syllable = ''
    
    if current_syllable:
        syllables.append(current_syllable)
    
    return '-'.join(syllables) if len(syllables) > 1 else word

@tool
def generate_targeted_story(previous_feedback: str, name: str, grade: str, missed_words: list = None) -> str:
    """
    Generate a new story that specifically targets words the student struggled with.
    Agentic story generation based on learning gaps.
    
    Args:
        previous_feedback (str): Previous reading feedback
        name (str): Student's name
        grade (str): Student's grade level
        missed_words (list): Words the student had trouble with
    
    Returns:
        str: New targeted story for practice
    """
    grade_num = int(''.join(filter(str.isdigit, grade)) or "3")
    age = grade_num + 5
    
    # Extract difficulty level from previous feedback
    if "AMAZING" in previous_feedback or "accuracy: 9" in previous_feedback or "🌟 AMAZING" in previous_feedback:
        difficulty_adjustment = "more challenging with advanced vocabulary"
        focus_area = "new vocabulary, longer sentences, and complex concepts"
    elif "GREAT JOB" in previous_feedback or "accuracy: 8" in previous_feedback or "🎉 GREAT JOB" in previous_feedback:
        difficulty_adjustment = "slightly more challenging"
        focus_area = "new vocabulary and longer sentences"
    elif "GOOD" in previous_feedback or "accuracy: 7" in previous_feedback or "👍 GOOD WORK" in previous_feedback:
        difficulty_adjustment = "similar level with some new words"
        focus_area = "reinforcing current skills"
    else:
        difficulty_adjustment = "simpler and shorter"
        focus_area = "basic vocabulary and simple sentences"
    
    # Create targeted practice words
    if missed_words:
        practice_words = missed_words[:5]  # Focus on top 5 missed words
        word_focus = f"Include and repeat these practice words: {', '.join(practice_words)}"
    else:
        word_focus = "Focus on common sight words for this grade level"
    
    # Generate adaptive prompt
    prompt = f"""
    You are an expert reading coach creating a personalized story for {name}, a {age}-year-old in {grade}.
    
    LEARNING ADAPTATION:
    - Make this story {difficulty_adjustment} than the previous one
    - Focus on: {focus_area}
    - {word_focus}
    
    STORY REQUIREMENTS:
    - Feature {name} as the main character
    - Include an engaging adventure or discovery theme
    - Naturally incorporate the practice words multiple times
    - Make it fun and encouraging
    - End with {name} feeling proud and accomplished
    
    Create a story that helps {name} practice the words they found challenging while building confidence.
    
    Story:
    """
    
    # Generate targeted story
    model = genai.GenerativeModel('gemini-2.0-flash')
    max_tokens = 300 if grade_num <= 2 else 600 if grade_num <= 4 else 1000
    
    generation_config = {
        "temperature": 0.7,
        "max_output_tokens": max_tokens,
        "top_p": 0.9,
    }
    
    response = model.generate_content(
        contents=prompt,
        generation_config=generation_config
    )
    
    return response.text.strip()

class SessionManager:
    """Manages student sessions and progress tracking"""
    
    def __init__(self):
        self.sessions = {}
        self.student_progress = {}
    
    def start_session(self, student_name: str, grade: str) -> str:
        """Start a new reading session for a student"""
        session_id = f"{student_name}_{int(time.time())}"
        self.sessions[session_id] = {
            "student_name": student_name,
            "grade": grade,
            "start_time": time.time(),
            "stories_read": 0,
            "total_accuracy": 0,
            "feedback_history": []
        }
        return session_id
    
    def get_session(self, session_id: str) -> dict:
        """Get session data"""
        return self.sessions.get(session_id, {})
    
    def update_session(self, session_id: str, accuracy: float, feedback: str):
        """Update session with reading results"""
        if session_id in self.sessions:
            session = self.sessions[session_id]
            session["stories_read"] += 1
            session["total_accuracy"] += accuracy
            session["feedback_history"].append({
                "timestamp": time.time(),
                "accuracy": accuracy,
                "feedback": feedback
            })


class ReadingCoachAgent:
    """
    Main agent class that provides the interface for the reading coach system.
    Wraps the individual tool functions and manages student sessions.
    """
    
    def __init__(self):
        self.session_manager = SessionManager()
        self.current_session = None
        self.current_story = ""
        self.student_info = {"name": "", "grade": ""}
    
    def generate_story_for_student(self, name: str, grade: str, topic: str) -> str:
        """Generate a story for a student and start/update session"""
        # Store student info
        self.student_info = {"name": name, "grade": grade}
        
        # Start or update session
        session_id = self.session_manager.start_session(name, grade)
        self.current_session = session_id
        
        # Generate story using the tool function
        story = generate_story(name, grade, topic)
        self.current_story = story
        
        return story
    
    def create_audio_from_story(self, story: str) -> str:
        """Convert story to audio using TTS"""
        return text_to_speech(story)
    
    def analyze_student_reading(self, audio_path: str) -> tuple:
        """Analyze student's reading and provide feedback"""
        # Transcribe the audio
        transcribed_text = transcribe_audio(audio_path)
        
        # Compare with original story and get feedback
        feedback = compare_texts_for_feedback(self.current_story, transcribed_text)
        
        # Extract accuracy from feedback
        accuracy = self._extract_accuracy_from_feedback(feedback)
        
        # Update session if we have one
        if self.current_session:
            self.session_manager.update_session(self.current_session, accuracy, feedback)
        
        return transcribed_text, feedback, accuracy
    
    def generate_new_passage(self, topic: str) -> str:
        """Generate a new passage with the current student info"""
        if not self.student_info["name"] or not self.student_info["grade"]:
            raise ValueError("No active session. Please start a new session first.")
        
        # Generate new story
        story = generate_story(self.student_info["name"], self.student_info["grade"], topic)
        self.current_story = story
        
        return story
    
    def generate_practice_story(self, name: str, grade: str) -> str:
        """Generate a new targeted practice story based on previous feedback"""
        if not self.student_info.get("name") or not self.student_info.get("grade"):
            # Use provided parameters if student info is not available
            name = name or "Student"
            grade = grade or "Grade 3"
        else:
            name = self.student_info["name"]
            grade = self.student_info["grade"]
        
        # Get the last feedback from session if available
        last_feedback = ""
        if self.current_session and self.current_session in self.session_manager.sessions:
            session_data = self.session_manager.sessions[self.current_session]
            if session_data.get("feedback_history"):
                last_feedback = session_data["feedback_history"][-1].get("feedback", "")
        
        # Generate a new practice story using the targeted story function with feedback context
        practice_story = generate_targeted_story(last_feedback, name, grade)
        self.current_story = practice_story
        
        return practice_story

    def clear_session(self):
        """Clear current session"""
        self.current_session = None
        self.current_story = ""
        self.student_info = {"name": "", "grade": ""}

    def reset_all_data(self):
        """Reset all current session state but keep tracked sessions."""
        self.clear_session()
    
    def _extract_accuracy_from_feedback(self, feedback: str) -> float:
        """Extract accuracy percentage from feedback text"""
        import re
        # Look for "Reading accuracy: XX.X%" pattern in feedback
        match = re.search(r'Reading accuracy:\s*(\d+\.?\d*)%', feedback)
        if match:
            return float(match.group(1))
        return 0.0