# -*- coding: utf-8 -*-
"""
网页端应用 - 个性化饮食推荐助手 + 背诵排序功能
"""

from flask import Flask, render_template, request, jsonify, session, Response
import re
import random
import logging
import json
from pathlib import Path
from datetime import datetime

# 导入业务模块
from core.base import BaseConfig, AppCore, ModuleManager, ModuleType, initialize_app
from modules.data_collection import DataCollectionModule
from modules.ai_analysis import AIAnalysisModule
from modules.recommendation_engine import RecommendationEngine
from modules.ocr_calorie_recognition import OCRCalorieRecognitionModule

# 配置日志 - 确保UTF-8编码
import sys
# 设置标准输出编码为UTF-8
if sys.stdout.encoding != 'utf-8':
    sys.stdout.reconfigure(encoding='utf-8')
if sys.stderr.encoding != 'utf-8':
    sys.stderr.reconfigure(encoding='utf-8')

# 创建logs目录
Path('logs').mkdir(exist_ok=True)

logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler('logs/web_app.log', encoding='utf-8'),
        logging.StreamHandler(sys.stdout)
    ],
    force=True  # 强制重新配置
)

logger = logging.getLogger(__name__)

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your-secret-key-here'
# 确保模板文件使用UTF-8编码读取
app.jinja_env.auto_reload = True
app.config['TEMPLATES_AUTO_RELOAD'] = True
# 设置Jinja2模板加载器使用UTF-8编码
from jinja2 import FileSystemLoader
app.jinja_loader = FileSystemLoader('templates', encoding='utf-8')

# 确保所有响应使用UTF-8编码
@app.after_request
def after_request(response):
    """确保所有响应使用UTF-8编码"""
    response.headers['Content-Type'] = response.headers.get('Content-Type', 'text/html; charset=utf-8')
    if 'charset=' not in response.headers.get('Content-Type', ''):
        if response.headers.get('Content-Type', '').startswith('text/html'):
            response.headers['Content-Type'] = 'text/html; charset=utf-8'
        elif response.headers.get('Content-Type', '').startswith('application/json'):
            response.headers['Content-Type'] = 'application/json; charset=utf-8'
    return response

# 初始化应用核心（延迟加载，避免在导入时就初始化）
app_core = None
config = None

def get_app_core():
    """获取应用核心实例（延迟初始化）"""
    global app_core, config
    if app_core is None:
        config = BaseConfig()
        if initialize_app(config):
            app_core = AppCore(config)
            # 注册所有模块
            module_manager = ModuleManager(config)
            module_manager.register_module(DataCollectionModule(config))
            module_manager.register_module(AIAnalysisModule(config))
            module_manager.register_module(RecommendationEngine(config))
            module_manager.register_module(OCRCalorieRecognitionModule(config))
            module_manager.initialize_all()
            app_core.module_manager = module_manager
            app_core.start()
            logger.info("应用核心初始化完成")
        else:
            logger.error("应用核心初始化失败")
    return app_core


class RecitationSorter:
    """背诵排序器"""
    
    def __init__(self):
        self.items = []
    
    def extract_items(self, text):
        """从文本中提取背诵项目"""
        items = []
        
        # 方法1: 按行分割，过滤空行和无关行
        lines = text.strip().split('\n')
        for line in lines:
            line = line.strip()
            # 跳过空行
            if not line:
                continue
            
            # 跳过明显的表头行（包含"章节"、"知识点"等）
            if any(keyword in line for keyword in ['章节', '知识点', '选择题', '主观题', '完成', '划']):
                continue
            
            # 跳过页码行
            if re.match(r'^第\d+页', line) or re.match(r'^共\d+页', line):
                continue
            
            # 跳过说明文字
            if any(keyword in line for keyword in ['使用说明', '祝:', '凯程', '框架', '理解', '背诵']):
                continue
            
            # 提取知识点的几种模式
            # 模式1: 以数字或字母开头（如"1. 知识点"或"第一章 内容"）
            match = re.match(r'^[第]?[一二三四五六七八九十\d]+[章节]?\s*[：:、]?\s*(.+)', line)
            if match:
                item = match.group(1).strip()
                if item and len(item) > 1:  # 至少2个字符才认为是有效知识点
                    items.append(item)
                continue
            
            # 模式2: 以"-"或"•"开头的列表项
            match = re.match(r'^[-•]\s*(.+)', line)
            if match:
                item = match.group(1).strip()
                if item and len(item) > 1:
                    items.append(item)
                continue
            
            # 模式3: 表格中的知识点（通常不包含特殊标记符）
            # 如果行中包含常见的中文标点，但不包含表格标记符，可能是知识点
            if len(line) > 2 and not re.match(r'^[✓×√✗\s]+$', line):
                # 检查是否包含常见的中文内容
                if re.search(r'[\u4e00-\u9fff]', line):  # 包含中文
                    # 排除明显的表格分隔符
                    if not re.match(r'^[|+\-\s]+$', line):
                        items.append(line)
        
        # 去重
        unique_items = []
        seen = set()
        for item in items:
            # 标准化：去除首尾空格，统一标点
            normalized = item.strip()
            if normalized and normalized not in seen:
                seen.add(normalized)
                unique_items.append(normalized)
        
        return unique_items
    
    def random_sort(self, items):
        """随机排序项目"""
        shuffled = items.copy()
        random.shuffle(shuffled)
        return shuffled


# 创建全局排序器实例
sorter = RecitationSorter()


@app.route('/')
def index():
    """首页"""
    return render_template('index.html')


@app.route('/recitation')
def recitation():
    """背诵排序页面"""
    return render_template('recitation.html')


@app.route('/data-collection')
def data_collection():
    """数据采集页面"""
    return render_template('data_collection.html')


@app.route('/recommendation')
def recommendation():
    """推荐页面"""
    return render_template('recommendation.html')


@app.route('/analysis')
def analysis():
    """分析页面"""
    return render_template('analysis.html')


@app.route('/api/extract', methods=['POST'])
def extract_items():
    """提取背诵项目API"""
    try:
        data = request.get_json()
        text = data.get('text', '')
        
        if not text:
            return jsonify({
                'success': False,
                'message': '请输入要处理的文本'
            }), 400
        
        # 提取项目
        items = sorter.extract_items(text)
        
        if not items:
            return jsonify({
                'success': False,
                'message': '未能识别到背诵内容，请检查文本格式'
            }), 400
        
        logger.info(f"提取到 {len(items)} 个背诵项目")
        
        return jsonify({
            'success': True,
            'items': items,
            'count': len(items)
        })
    
    except Exception as e:
        logger.error(f"提取项目失败: {e}")
        return jsonify({
            'success': False,
            'message': f'处理失败: {str(e)}'
        }), 500


@app.route('/api/sort', methods=['POST'])
def sort_items():
    """随机排序API"""
    try:
        data = request.get_json()
        items = data.get('items', [])
        
        if not items:
            return jsonify({
                'success': False,
                'message': '请先提取背诵项目'
            }), 400
        
        # 随机排序
        sorted_items = sorter.random_sort(items)
        
        logger.info(f"对 {len(sorted_items)} 个项目进行随机排序")
        
        return jsonify({
            'success': True,
            'items': sorted_items,
            'count': len(sorted_items)
        })
    
    except Exception as e:
        logger.error(f"排序失败: {e}")
        return jsonify({
            'success': False,
            'message': f'排序失败: {str(e)}'
        }), 500


@app.route('/api/export/sorted', methods=['POST'])
def export_sorted():
    """导出排序结果"""
    try:
        data = request.get_json()
        items = data.get('items', [])
        export_format = data.get('format', 'txt')  # txt, json, csv
        
        if not items:
            return jsonify({
                'success': False,
                'message': '没有可导出的数据'
            }), 400
        
        if export_format == 'json':
            content = json.dumps({
                'items': items,
                'count': len(items),
                'export_time': datetime.now().strftime('%Y-%m-%d %H:%M:%S')
            }, ensure_ascii=False, indent=2)
            filename = f'背诵排序结果_{datetime.now().strftime("%Y%m%d_%H%M%S")}.json'
            mimetype = 'application/json; charset=utf-8'
        elif export_format == 'csv':
            import csv
            import io
            output = io.StringIO()
            writer = csv.writer(output)
            writer.writerow(['序号', '知识点'])
            for i, item in enumerate(items, 1):
                writer.writerow([i, item])
            content = output.getvalue()
            filename = f'背诵排序结果_{datetime.now().strftime("%Y%m%d_%H%M%S")}.csv'
            mimetype = 'text/csv; charset=utf-8'
        else:  # txt
            content_lines = ['背诵排序结果', '=' * 50, '']
            for i, item in enumerate(items, 1):
                content_lines.append(f'{i}. {item}')
            content_lines.extend(['', '=' * 50, f'导出时间: {datetime.now().strftime("%Y-%m-%d %H:%M:%S")}'])
            content = '\n'.join(content_lines)
            filename = f'背诵排序结果_{datetime.now().strftime("%Y%m%d_%H%M%S")}.txt'
            mimetype = 'text/plain; charset=utf-8'
        
        # 修复文件名编码问题：HTTP头必须使用latin-1编码
        # 使用RFC 5987标准编码中文文件名
        from urllib.parse import quote
        
        # ASCII fallback文件名（确保兼容性）
        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        fallback_filename = f'recitation_sorted_{timestamp}.{export_format}'
        
        # RFC 5987编码：对UTF-8字节序列进行百分号编码
        # 格式: filename="fallback"; filename*=UTF-8''encoded
        # 将所有字节都进行百分号编码，确保HTTP头的latin-1兼容性
        try:
            utf8_bytes = filename.encode('utf-8')
            # 对所有字节进行百分号编码（大写十六进制）
            encoded_filename = ''.join([f'%{b:02X}' for b in utf8_bytes])
        except Exception as e:
            logger.warning(f"文件名编码失败，使用fallback: {e}")
            encoded_filename = fallback_filename
        
        # 构建Content-Disposition头：同时提供fallback和UTF-8编码版本
        content_disposition = (
            f'attachment; filename="{fallback_filename}"; '
            f"filename*=UTF-8''{encoded_filename}"
        )
        
        response = Response(
            content.encode('utf-8'),
            mimetype=mimetype,
            headers={
                'Content-Disposition': content_disposition
            }
        )
        
        return response
    
    except Exception as e:
        logger.error(f"导出失败: {e}")
        return jsonify({
            'success': False,
            'message': f'导出失败: {str(e)}'
        }), 500


# ==================== 业务功能API ====================

@app.route('/api/user/login', methods=['POST'])
def user_login():
    """用户登录"""
    try:
        data = request.get_json()
        user_id = data.get('user_id', '').strip()
        
        if not user_id:
            return jsonify({
                'success': False,
                'message': '请输入用户ID'
            }), 400
        
        # 获取用户数据（如果不存在会自动创建）
        core = get_app_core()
        user_data = core.get_user_data(user_id)
        
        if user_data:
            session['user_id'] = user_id
            return jsonify({
                'success': True,
                'user_id': user_id,
                'name': user_data.profile.get('name', '未设置')
            })
        else:
            return jsonify({
                'success': False,
                'message': '用户数据获取失败'
            }), 500
    
    except Exception as e:
        logger.error(f"用户登录失败: {e}")
        return jsonify({
            'success': False,
            'message': f'登录失败: {str(e)}'
        }), 500


@app.route('/api/user/register', methods=['POST'])
def user_register():
    """用户注册"""
    try:
        data = request.get_json()
        user_id = data.get('user_id', '').strip()
        name = data.get('name', '').strip()
        
        if not user_id or not name:
            return jsonify({
                'success': False,
                'message': '请输入用户ID和姓名'
            }), 400
        
        core = get_app_core()
        user_data = core.get_user_data(user_id)
        
        # 更新用户基本信息
        user_data.profile['name'] = name
        core.data_manager.save_user_data(user_data)
        
        session['user_id'] = user_id
        return jsonify({
            'success': True,
            'user_id': user_id,
            'name': name
        })
    
    except Exception as e:
        logger.error(f"用户注册失败: {e}")
        return jsonify({
            'success': False,
            'message': f'注册失败: {str(e)}'
        }), 500


@app.route('/api/questionnaire/submit', methods=['POST'])
def submit_questionnaire():
    """提交问卷"""
    try:
        user_id = session.get('user_id') or request.json.get('user_id')
        if not user_id:
            return jsonify({
                'success': False,
                'message': '请先登录'
            }), 401
        
        data = request.get_json()
        questionnaire_type = data.get('type', 'basic')  # basic, taste, physiological
        answers = data.get('answers', {})
        
        core = get_app_core()
        input_data = {
            'type': 'questionnaire',
            'questionnaire_type': questionnaire_type,
            'answers': answers
        }
        
        result = core.process_user_request(ModuleType.DATA_COLLECTION, input_data, user_id)
        
        if result and result.result.get('success', False):
            return jsonify({
                'success': True,
                'message': '问卷提交成功'
            })
        else:
            return jsonify({
                'success': False,
                'message': result.result.get('message', '问卷提交失败') if result else '处理失败'
            }), 500
    
    except Exception as e:
        logger.error(f"提交问卷失败: {e}")
        return jsonify({
            'success': False,
            'message': f'提交失败: {str(e)}'
        }), 500


@app.route('/api/meal/record', methods=['POST'])
def record_meal():
    """记录餐食"""
    try:
        user_id = session.get('user_id') or request.json.get('user_id')
        if not user_id:
            return jsonify({
                'success': False,
                'message': '请先登录'
            }), 401
        
        data = request.get_json()
        meal_data = {
            'date': data.get('date', datetime.now().strftime('%Y-%m-%d')),
            'meal_type': data.get('meal_type', 'lunch'),  # breakfast, lunch, dinner
            'foods': data.get('foods', []),
            'quantities': data.get('quantities', []),
            'calories': data.get('calories', 0),
            'satisfaction_score': data.get('satisfaction_score', 3),
            'notes': data.get('notes', '')
        }
        
        core = get_app_core()
        input_data = {
            'type': 'meal_record',
            **meal_data
        }
        
        result = core.process_user_request(ModuleType.DATA_COLLECTION, input_data, user_id)
        
        if result and result.result.get('success', False):
            return jsonify({
                'success': True,
                'message': '餐食记录成功'
            })
        else:
            return jsonify({
                'success': False,
                'message': result.result.get('message', '记录失败') if result else '处理失败'
            }), 500
    
    except Exception as e:
        logger.error(f"记录餐食失败: {e}")
        return jsonify({
            'success': False,
            'message': f'记录失败: {str(e)}'
        }), 500


@app.route('/api/recommendation/get', methods=['POST'])
def get_recommendations():
    """获取餐食推荐"""
    try:
        user_id = session.get('user_id') or request.json.get('user_id')
        if not user_id:
            return jsonify({
                'success': False,
                'message': '请先登录'
            }), 401
        
        data = request.get_json()
        meal_type = data.get('meal_type', 'lunch')
        preferences = data.get('preferences', {})
        context = data.get('context', {})
        
        core = get_app_core()
        input_data = {
            'type': 'meal_recommendation',
            'meal_type': meal_type,
            'preferences': preferences,
            'context': context
        }
        
        result = core.process_user_request(ModuleType.RECOMMENDATION, input_data, user_id)
        
        if result and result.result.get('success', False):
            return jsonify({
                'success': True,
                'recommendations': result.result.get('recommendations', [])
            })
        else:
            return jsonify({
                'success': False,
                'message': result.result.get('message', '推荐失败') if result else '处理失败',
                'recommendations': []
            }), 500
    
    except Exception as e:
        logger.error(f"获取推荐失败: {e}")
        return jsonify({
            'success': False,
            'message': f'获取失败: {str(e)}',
            'recommendations': []
        }), 500


@app.route('/api/analysis/nutrition', methods=['POST'])
def analyze_nutrition():
    """营养分析"""
    try:
        user_id = session.get('user_id') or request.json.get('user_id')
        if not user_id:
            return jsonify({
                'success': False,
                'message': '请先登录'
            }), 401
        
        data = request.get_json()
        meal_data = data.get('meal_data', {})
        
        core = get_app_core()
        input_data = {
            'type': 'nutrition_analysis',
            'meal_data': meal_data
        }
        
        result = core.process_user_request(ModuleType.USER_ANALYSIS, input_data, user_id)
        
        if result and result.result.get('success', False):
            return jsonify({
                'success': True,
                'analysis': result.result.get('analysis', {})
            })
        else:
            return jsonify({
                'success': False,
                'message': result.result.get('message', '分析失败') if result else '处理失败'
            }), 500
    
    except Exception as e:
        logger.error(f"营养分析失败: {e}")
        return jsonify({
            'success': False,
            'message': f'分析失败: {str(e)}'
        }), 500


@app.route('/health')
def health():
    """健康检查"""
    return jsonify({'status': 'ok'})


if __name__ == '__main__':
    # 创建必要的目录
    Path('templates').mkdir(exist_ok=True)
    Path('static').mkdir(exist_ok=True)
    Path('logs').mkdir(exist_ok=True)
    
    # 启动应用
    app.run(debug=True, host='0.0.0.0', port=5000)