"""
Teaching Mode - Interactive learning with mistake detection
"""
from typing import Dict, List, Optional
from .memory import MemorySystem, EnglishMistakeDetector, ConversationStyle

class TeachingMode:
    """Interactive teaching with mistake detection and friendly conversation"""
    
    def __init__(self, user_id: str = "default", style: str = "friend"):
        self.user_id = user_id
        self.memory = MemorySystem(user_id)
        self.mistake_detector = EnglishMistakeDetector()
        self.conversation_style = ConversationStyle(style)
        self.current_topic = None
        self.lesson_progress = {}
    
    def start_lesson(self, topic: str) -> Dict:
        """Start a new lesson"""
        self.current_topic = topic
        self.lesson_progress = {
            'topic': topic,
            'started': True,
            'mistakes': 0,
            'corrections': 0,
            'examples_practiced': 0
        }
        
        greeting = self.conversation_style.get_response('greeting')
        
        topic_intros = {
            'english': f"{greeting}\n\nLet's practice English together! I'll help you with grammar, vocabulary, and conversation. Just write anything in English and I'll help you improve! 📚",
            'grammar': f"{greeting}\n\nLet's work on English grammar! I'll teach you tenses, articles, prepositions, and more. Try writing some sentences! ✍️",
            'vocabulary': f"{greeting}\n\nLet's build your vocabulary! I'll teach you new words and how to use them. Try using new words in sentences! 📖",
            'conversation': f"{greeting}\n\nLet's practice conversation! Just talk to me like a friend, and I'll help you sound more natural. 💬",
            'hindi': f"{greeting}\n\nLet's practice Hindi! Main aapki madad karunga Hindi seekhne mein. Hindi mein kuch likhiye! 🇮🇳",
            'math': f"{greeting}\n\nLet's solve math problems together! Show me what you're working on, and I'll help you step by step. 🔢"
        }
        
        intro = topic_intros.get(topic.lower(), f"{greeting}\n\nLet's learn {topic} together! I'm here to help you. What would you like to start with?")
        
        return {
            'response': intro,
            'topic': topic,
            'status': 'started'
        }
    
    def process_input(self, user_input: str) -> Dict:
        """Process user input and provide feedback"""
        response = {
            'original_input': user_input,
            'mistakes_found': [],
            'corrections': [],
            'feedback': '',
            'encouragement': '',
            'next_step': ''
        }
        
        # Detect mistakes if it's English practice
        if self.current_topic and self.current_topic.lower() in ['english', 'grammar', 'conversation', 'vocabulary']:
            mistakes = self.mistake_detector.detect_mistakes(user_input)
            
            if mistakes:
                response['mistakes_found'] = mistakes
                
                # Create corrections
                for mistake in mistakes:
                    correction_msg = self.conversation_style.format_correction(
                        mistake['original'],
                        mistake['correction'],
                        self.mistake_detector.get_explanation(mistake)
                    )
                    response['corrections'].append(correction_msg)
                    
                    # Record mistake in memory
                    self.memory.add_mistake(
                        mistake['original'],
                        mistake['correction'],
                        mistake['type'],
                        self.current_topic
                    )
                
                response['feedback'] = f"I found {len(mistakes)} mistake(s). Let me help you fix them! 💪"
            else:
                response['feedback'] = self.conversation_style.get_response('encouragement')
                response['next_step'] = "Your sentence is perfect! Try another one or ask me anything."
        
        # Store conversation in memory
        full_response = response['feedback']
        if response['corrections']:
            full_response += "\n\n" + "\n".join(response['corrections'])
        
        self.memory.add_conversation(user_input, full_response, self.current_topic or '')
        
        return response
    
    def get_learning_summary(self) -> Dict:
        """Get user's learning summary"""
        stats = self.memory.get_user_stats()
        weak_areas = self.memory.get_weak_areas()
        learned = self.memory.get_learned_topics()
        common_mistakes = self.memory.get_common_mistakes(top_n=3)
        
        summary = f"""
📊 **Your Learning Progress**

✅ Topics Learned: {len(learned)}
🎯 Weak Areas: {len(weak_areas)}
✍️ Corrections Made: {stats['corrections_made']}
💬 Conversations: {stats['total_conversations']}
📈 Progress: {stats['learning_progress']:.1f}%

"""
        
        if weak_areas:
            summary += f"📚 Focus Areas: {', '.join(weak_areas[:3])}\n"
        
        if common_mistakes:
            summary += "\n🔍 Common Mistakes to Work On:\n"
            for mistake in common_mistakes:
                summary += f"  • '{mistake['mistake']}' (appeared {mistake['count']} times)\n"
        
        if learned:
            summary += f"\n🎉 Great Job! You've learned: {', '.join(learned[:5])}"
        
        return {
            'summary': summary,
            'stats': stats,
            'weak_areas': weak_areas,
            'learned_topics': learned
        }
    
    def set_style(self, style: str):
        """Change conversation style"""
        self.conversation_style = ConversationStyle(style)
        self.memory.set_preference('conversation_style', style)
        return f"Sure! I'll talk to you as your {style} now! 😊"
    
    def check_progress(self, topic: str = None) -> Dict:
        """Check user's progress in a topic"""
        topic = topic or self.current_topic
        
        if not topic:
            return {'error': 'No topic selected. Start a lesson first!'}
        
        improvement = self.memory.check_improvement(topic)
        mistakes = self.memory.get_mistake_history(topic)
        
        return {
            'topic': topic,
            'total_mistakes': len(mistakes),
            'improvement': improvement,
            'message': improvement['message']
        }
    
    def get_personalized_lesson(self) -> Dict:
        """Get a personalized lesson based on weak areas"""
        weak_areas = self.memory.get_weak_areas()
        
        if not weak_areas:
            return {
                'response': "You're doing great! No specific weak areas found. Let's practice something new! What topic interests you?",
                'suggestion': 'new_topic'
            }
        
        # Pick the most common weak area
        focus_area = weak_areas[0]
        
        lesson_suggestions = {
            'tense': "I noticed you sometimes struggle with tenses. Let's practice past tense! Can you tell me what you did yesterday?",
            'article': "Let's work on articles (a, an, the). Try writing 3 sentences about your day, and I'll help with articles!",
            'preposition': "Prepositions can be tricky! Let's practice common ones: in, on, at. Tell me where things are in your room.",
            'subject-verb agreement': "Let's practice matching subjects with verbs. Try: 'He/She/It ___' and fill in the blank!",
            'indian_english': "Let's work on standard English expressions. I'll give you common phrases and we'll practice the natural way to say them!"
        }
        
        suggestion = lesson_suggestions.get(focus_area, f"Let's work on {focus_area}. Ready to practice?")
        
        return {
            'response': suggestion,
            'focus_area': focus_area,
            'suggestion': 'personalized_practice'
        }