from flask import Blueprint, request, jsonify
from .functions.FAuth import FAuth
from app.services.recommendation_service import RecommendationService
from app.utils.graph_build import build_user_post_graph
from app.utils.gpuwriter import GpuWriter
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from config import Config
from functools import wraps
from datetime import datetime

main = Blueprint('main', __name__)

# 初始化推荐服务
recommendation_service = RecommendationService()

def token_required(f):
    """装饰器：需要令牌验证"""
    @wraps(f)
    def decorated(*args, **kwargs):
        token = request.headers.get('Authorization')
        print(f"收到的Authorization头: {token}")
        
        if not token:
            print("缺少Authorization头")
            return jsonify({'success': False, 'message': '缺少访问令牌'}), 401
        
        session = None
        try:
            # 移除Bearer前缀
            if token.startswith('Bearer '):
                token = token[7:]
                print(f"提取的token: {token[:20]}...")
            
            engine = create_engine(Config.SQLURL)
            SessionLocal = sessionmaker(bind=engine)
            session = SessionLocal()
            f_auth = FAuth(session)
            
            # 验证token
            token_data = f_auth.verify_token(token)
            print(f"Token验证结果: {token_data}")
            
            if not token_data:
                print("Token验证失败 - token无效")
                return jsonify({'success': False, 'message': '无效的访问令牌'}), 401
            
            user = f_auth.get_user_by_token(token)
            if not user:
                print("根据token获取用户失败")
                return jsonify({'success': False, 'message': '无效的访问令牌'}), 401
            
            print(f"Token验证成功，用户: {user.username}, ID: {user.id}")
            
            # 将用户信息传递给路由函数
            return f(user, *args, **kwargs)
        except Exception as e:
            print(f"Token验证异常: {str(e)}")
            if session:
                session.rollback()
            return jsonify({'success': False, 'message': f'令牌验证失败: {str(e)}'}), 401
        finally:
            if session:
                session.close()
    
    return decorated

@main.route('/login', methods=['POST'])
def login():
    """用户登录接口"""
    session = None
    try:
        data = request.get_json()
        
        # 验证必填字段
        if not data or not data.get('email') or not data.get('password'):
            return jsonify({
                'success': False, 
                'message': '用户名和密码不能为空'
            }), 400
        
        email = data['email']
        password = data['password']
        
        # 创建数据库连接
        engine = create_engine(Config.SQLURL)
        SessionLocal = sessionmaker(bind=engine)
        session = SessionLocal()
        
        # 执行登录
        f_auth = FAuth(session)
        result = f_auth.login(email, password)
        
        if result['success']:
            session.commit()
            return jsonify(result), 200
        else:
            return jsonify(result), 401
            
    except Exception as e:
        if session:
            session.rollback()
        return jsonify({
            'success': False, 
            'message': '服务器内部错误'
        }), 500
    finally:
        if session:
            session.close()

@main.route('/register', methods=['POST'])
def register():
    """用户注册接口"""
    
    engine = create_engine(Config.SQLURL)
    SessionLocal = sessionmaker(bind=engine)
    session = SessionLocal()
    
    try:
        data = request.get_json()
        
        # 验证必填字段
        if not data or not data.get('username') or not data.get('email') or not data.get('password') or not data.get('verification_code'):
            return jsonify({
                'success': False, 
                'message': '用户名、邮箱和密码不能为空'
            }), 400
        
        username = data['username']
        email = data['email']
        password = data['password']
        verification_code = data['verification_code']
        
        # 简单的邮箱格式验证
        if '@' not in email or '.' not in email:
            return jsonify({
                'success': False, 
                'message': '邮箱格式不正确'
            }), 400
        
        # 密码长度验证
        if len(password) < 6:
            return jsonify({
                'success': False, 
                'message': '密码长度不能少于6位'
            }), 400
        
        # 执行注册
        f_auth = FAuth(session)
        result = f_auth.register(username, email, password, verification_code)
        
        if result['success']:
            session.commit()
            return jsonify(result), 201
        else:
            return jsonify(result), 400
            
    except Exception as e:
        session.rollback()
        return jsonify({
            'success': False, 
            'message': '服务器内部错误'
        }), 500
    finally:
        session.close()

@main.route('/profile', methods=['GET'])
@token_required
def get_profile(current_user):
    """获取用户信息接口（需要登录）"""
    try:
        return jsonify({
            'success': True,
            'user': current_user.to_dict()
        }), 200
    except Exception as e:
        return jsonify({
            'success': False, 
            'message': '获取用户信息失败'
        }), 500

@main.route('/logout', methods=['POST'])
@token_required
def logout(current_user):
    """用户登出接口（需要登录）"""
    try:
        # 这里可以将令牌加入黑名单（如果需要的话）
        return jsonify({
            'success': True,
            'message': '登出成功'
        }), 200
    except Exception as e:
        return jsonify({
            'success': False, 
            'message': '登出失败'
        }), 500

@main.route('/send-verification-code', methods=['POST'])
def send_verification_code():
    """发送邮箱验证码接口"""
    
    engine = create_engine(Config.SQLURL)
    SessionLocal = sessionmaker(bind=engine)
    session = SessionLocal()
    
    try:
        data = request.get_json()
        
        # 验证必填字段
        if not data or not data.get('email'):
            return jsonify({
                'success': False, 
                'message': '邮箱地址不能为空'
            }), 400
        
        email = data['email']
        verification_type = data.get('type', 'register')  # 默认为注册验证码
        
        # 简单的邮箱格式验证
        if '@' not in email or '.' not in email:
            return jsonify({
                'success': False, 
                'message': '邮箱格式不正确'
            }), 400
        
        # 发送验证码
        f_auth = FAuth(session)
        result = f_auth.send_verification_email(email, verification_type)
        
        if result['success']:
            session.commit()
            return jsonify(result), 200
        else:
            return jsonify(result), 400
            
    except Exception as e:
        session.rollback()
        return jsonify({
            'success': False, 
            'message': '服务器内部错误'
        }), 500
    finally:
        session.close()

@main.route('/reset-password', methods=['POST'])
def reset_password():
    """重置密码接口"""
    
    engine = create_engine(Config.SQLURL)
    SessionLocal = sessionmaker(bind=engine)
    session = SessionLocal()
    
    try:
        data = request.get_json()
        
        # 验证必填字段
        if not data or not data.get('email') or not data.get('new_password') or not data.get('verification_code'):
            return jsonify({
                'success': False, 
                'message': '邮箱地址、新密码和验证码不能为空'
            }), 400
        
        email = data['email']
        new_password = data['new_password']
        verification_code = data['verification_code']
        
        # 简单的邮箱格式验证
        if '@' not in email or '.' not in email:
            return jsonify({
                'success': False, 
                'message': '邮箱格式不正确'
            }), 400
        
        # 密码长度验证
        if len(new_password) < 6:
            return jsonify({
                'success': False, 
                'message': '密码长度不能少于6位'
            }), 400
        
        # 重置密码
        f_auth = FAuth(session)
        result = f_auth.reset_password_with_verification(email, new_password, verification_code)
        
        if result['success']:
            session.commit()
            return jsonify(result), 200
        else:
            return jsonify(result), 400
            
    except Exception as e:
        session.rollback()
        return jsonify({
            'success': False, 
            'message': '服务器内部错误'
        }), 500
    finally:
        session.close()

@main.route('/test-jwt', methods=['POST'])
@token_required
def test_jwt(current_user):
    """测试JWT令牌接口（需要登录）"""
    try:
        # 获取当前请求的token（从装饰器已验证的Authorization header）
        auth_header = request.headers.get('Authorization')
        current_token = auth_header[7:] if auth_header and auth_header.startswith('Bearer ') else None
        
        print(f"当前用户: {current_user.username}")
        print(f"当前用户ID: {current_user.id}")
        print(current_user.role)
        print(f"Token验证成功: {current_token[:20]}..." if current_token else "No token")
        
        # 可选：检查请求体中是否有额外的token需要验证
        data = request.get_json() or {}
        additional_token = data.get('token')
        
        response_data = {
            'success': True,
            'message': 'JWT令牌验证成功',
            'user': current_user.to_dict(),
            'token_info': {
                'header_token_verified': True,
                'token_preview': current_token[:20] + "..." if current_token else None
            }
        }
        
        # 如果请求体中有额外的token，也验证一下
        if additional_token:
            try:
                additional_result = FAuth.verify_token(additional_token)
                response_data['additional_token_verification'] = additional_result
                print(f"额外token验证结果: {additional_result}")
            except Exception as e:
                response_data['additional_token_verification'] = {
                    'success': False,
                    'message': f'额外token验证失败: {str(e)}'
                }
        
        return jsonify(response_data), 200
        
    except Exception as e:
        print(f"test_jwt 错误: {str(e)}")
        return jsonify({
            'success': False, 
            'message': f'JWT令牌验证失败: {str(e)}'
        }), 500
        
@main.route('/verify_user', methods=['POST'])
@token_required
def verify_user(current_user):
    """测试JWT令牌接口（需要登录）"""
    try:
        # 获取当前请求的token（从装饰器已验证的Authorization header）
        auth_header = request.headers.get('Authorization')
        current_token = auth_header[7:] if auth_header and auth_header.startswith('Bearer ') else None
        
        print(f"当前用户: {current_user.username}")
        print(f"当前用户ID: {current_user.id}")
        print(current_user.role)
        print(f"Token验证成功: {current_token[:20]}..." if current_token else "No token")
        
        # 可选：检查请求体中是否有额外的token需要验证
        data = request.get_json() or {}
        additional_token = data.get('token')
        
        response_data = {
            'success': True,
            'userid': current_user.id,
            'role': current_user.role,
        }
        
        return jsonify(response_data), 200
        
    except Exception as e:
        print(f"用户验证错误: {str(e)}")
        return jsonify({
            'success': False, 
            'message': f'JWT令牌验证失败: {str(e)}'
        }), 500

@main.route('/recommend', methods=['POST'])
@token_required
def get_recommendations(current_user):
    """获取个性化推荐接口"""
    try:
        data = request.get_json() or {}
        user_id = data.get('user_id') or current_user.id
        
        print(f"为用户 {user_id} 获取个性化推荐")
        
        # 调用推荐系统
        user2idx, post2idx = build_user_post_graph(return_mapping=True)
        recommendations = recommendation_service.get_recommendations(float(user_id), topk=10)
        
        return jsonify({
            'success': True,
            'data': {
                'user_id': user_id,
                'recommendations': recommendations,
                'count': len(recommendations),
                'type': 'personalized'
            },
            'message': '个性化推荐获取成功'
        }), 200
        
    except Exception as e:
        print(f"推荐系统错误: {str(e)}")
        return jsonify({
            'success': False, 
            'message': f'推荐获取失败: {str(e)}'
        }), 500

@main.route('/gpu-usage', methods=['GET'])
@token_required
def get_gpu_usage(current_user):
    """获取最新GPU使用情况接口"""
    try:
        limit = request.args.get('limit', 100, type=int)
        
        # 限制最大获取条数
        if limit > 1000:
            limit = 1000
            
        print(f"获取最新 {limit} 条GPU使用记录")
        
        # 创建GpuWriter实例并获取数据
        gpu_writer = GpuWriter(Config.SQLURL)
        gpu_records = gpu_writer.get_latest_gpu_usage(limit)
        
        return jsonify({
            'success': True,
            'data': {
                'records': gpu_records,
                'count': len(gpu_records),
                'limit': limit
            },
            'message': 'GPU使用情况获取成功'
        }), 200
        
    except Exception as e:
        print(f"获取GPU使用情况错误: {str(e)}")
        return jsonify({
            'success': False, 
            'message': f'获取GPU使用情况失败: {str(e)}'
        }), 500