import json
import re
import hashlib
from typing import List, Dict

class KnowledgeBase:
    def __init__(self):
        self.programs = {}
        self.courses = []
        self._load_data()
        
        self.itmo_keywords = [
            'итмо', 'магистратура', 'учебный план', 'дисциплина', 'курс',
            'ии', 'ai', 'ai product', 'институт ии', 'программа',
            'машинное обучение', 'глубокое обучение', 'nlp', 'компьютерное зрение',
            'нейронные сети', 'анализ данных', 'продуктовая аналитика'
        ]
    
    def _load_data(self):
        try:
            with open('data/processed/programs.json', 'r', encoding='utf-8') as f:
                self.programs = json.load(f)
        except FileNotFoundError:
            print('Файл programs.json не найден')
        
        try:
            with open('data/processed/courses.json', 'r', encoding='utf-8') as f:
                self.courses = json.load(f)
        except FileNotFoundError:
            print('Файл courses.json не найден')
    
    def is_itmo_query(self, message: str) -> bool:
        message_lower = message.lower()
        
        keyword_match = any(keyword in message_lower for keyword in self.itmo_keywords)
        
        if keyword_match:
            return True
        
        return False
    
    def recommend(self, profile: dict) -> List[Dict]:
        semester = profile.get('semester')
        if not semester:
            return []
        
        semester = int(semester)
        interests = profile.get('interests', [])
        programming_exp = profile.get('programming_experience', 2)
        math_level = profile.get('math_level', 2)
        
        filtered_courses = [
            course for course in self.courses 
            if course.get('semester') == semester
        ]
        
        if not filtered_courses:
            return []
        
        scored_courses = []
        for course in filtered_courses:
            score = self._calculate_recommendation_score(course, profile)
            scored_courses.append((course, score))
        
        scored_courses.sort(key=lambda x: x[1], reverse=True)
        
        recommendations = []
        for course, score in scored_courses[:7]:
            why = self._generate_recommendation_reason(course, profile)
            recommendations.append({
                'semester': course['semester'],
                'name': course['name'],
                'credits': course['credits'],
                'why': why
            })
        
        return recommendations
    
    def _calculate_recommendation_score(self, course: dict, profile: dict) -> float:
        interests = profile.get('interests', [])
        programming_exp = profile.get('programming_experience', 2)
        math_level = profile.get('math_level', 2)
        
        course_text = f"{course.get('name', '')} {course.get('short_desc', '')}".lower()
        course_tags = course.get('tags', [])
        
        similarity_score = 0.0
        if interests:
            interest_matches = sum(1 for interest in interests if interest in course_tags)
            similarity_score = interest_matches / len(interests)
        
        rule_score = 0.0
        
        if programming_exp >= 3:
            if any(tag in course_tags for tag in ['ml', 'dl', 'systems']):
                rule_score += 0.3
        
        if 'product' in interests or 'business' in interests:
            if any(tag in course_tags for tag in ['product', 'business', 'pm']):
                rule_score += 0.3
        
        if math_level >= 3:
            if any(tag in course_tags for tag in ['math', 'stats', 'dl']):
                rule_score += 0.3
        
        generic_score = 0.1
        
        final_score = 0.6 * similarity_score + 0.3 * rule_score + 0.1 * generic_score
        return final_score
    
    def _generate_recommendation_reason(self, course: dict, profile: dict) -> str:
        interests = profile.get('interests', [])
        course_tags = course.get('tags', [])
        
        matching_tags = [tag for tag in interests if tag in course_tags]
        
        if matching_tags:
            tag_names = {
                'ml': 'машинное обучение',
                'dl': 'глубокое обучение',
                'nlp': 'обработка естественного языка',
                'cv': 'компьютерное зрение',
                'product': 'продуктовая разработка',
                'business': 'бизнес-аналитика',
                'research': 'исследования',
                'data': 'анализ данных',
                'systems': 'системная архитектура'
            }
            
            tag_descriptions = [tag_names.get(tag, tag) for tag in matching_tags]
            return f'Соответствует вашим интересам: {", ".join(tag_descriptions)}'
        
        return 'Курс из учебного плана программы'
    
    def get_course_by_id(self, course_id: str) -> dict:
        for course in self.courses:
            if course.get('id') == course_id:
                return course
        return {}
    
    def get_program_by_id(self, program_id: str) -> dict:
        return self.programs.get(program_id, {})
    
    def search_courses(self, query: str, limit: int = 10) -> List[Dict]:
        query_lower = query.lower()
        results = []
        
        for course in self.courses:
            course_text = f"{course.get('name', '')} {course.get('short_desc', '')}".lower()
            
            if query_lower in course_text:
                results.append(course)
            
            if len(results) >= limit:
                break
        
        return results