from flask import Blueprint, request, jsonify, session
import random
import string
import re
from datetime import datetime, timedelta
from utils.db import get_db_connection, close_connection
from utils.password import hash_password
from utils.email_sender import send_verification_email
from utils.password import hash_password, check_password


# 创建蓝图
auth = Blueprint('auth', __name__)

# 存储临时验证码
verification_codes = {}


@auth.route('/register', methods=['POST'])
def register():
    """用户注册接口"""
    data = request.get_json()

    # 检查必要字段
    if not all(k in data for k in ('email', 'password', 'name')):
        return jsonify({'success': False, 'message': '缺少必要的注册信息'}), 400

    email = data['email']
    password = data['password']
    name = data['name']
    gender = data.get('gender')
    birth_date = data.get('birth_date')

    # 验证邮箱格式
    email_pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
    if not re.match(email_pattern, email):
        return jsonify({'success': False, 'message': '邮箱格式不正确'}), 400

    # 验证密码强度
    if len(password) < 8:
        return jsonify({'success': False, 'message': '密码长度必须至少为8个字符'}), 400

    # 检查邮箱是否已注册
    conn = get_db_connection()
    if not conn:
        return jsonify({'success': False, 'message': '数据库连接失败'}), 500

    cursor = conn.cursor(dictionary=True)
    cursor.execute("SELECT id FROM users WHERE email = %s", (email,))
    existing_user = cursor.fetchone()

    if existing_user:
        cursor.close()
        close_connection(conn)
        return jsonify({'success': False, 'message': '该邮箱已被注册'}), 400

    # 生成验证码
    verification_code = ''.join(random.choices(string.digits, k=6))

    # 存储验证码(实际项目中应使用Redis等带过期功能的存储)
    verification_codes[email] = {
        'code': verification_code,
        'expires': datetime.now() + timedelta(minutes=30),
        'user_data': {
            'email': email,
            'password': password,
            'name': name,
            'gender': gender,
            'birth_date': birth_date
        }
    }

    # 发送验证邮件
    email_sent = send_verification_email(email, verification_code)

    cursor.close()
    close_connection(conn)

    if not email_sent:
        return jsonify({'success': False, 'message': '验证邮件发送失败'}), 500

    return jsonify({
        'success': True,
        'message': '验证码已发送到您的邮箱，请查收并完成注册'
    })


@auth.route('/verify', methods=['POST'])
def verify():
    """验证邮箱验证码"""
    data = request.get_json()

    if not all(k in data for k in ('email', 'code')):
        return jsonify({'success': False, 'message': '缺少必要的验证信息'}), 400

    email = data['email']
    code = data['code']

    # 检查验证码
    if email not in verification_codes:
        return jsonify({'success': False, 'message': '验证码不存在或已过期'}), 400

    stored_data = verification_codes[email]

    # 检查验证码是否过期
    if datetime.now() > stored_data['expires']:
        del verification_codes[email]
        return jsonify({'success': False, 'message': '验证码已过期'}), 400

    # 检查验证码是否匹配
    if code != stored_data['code']:
        return jsonify({'success': False, 'message': '验证码不正确'}), 400

    # 获取用户数据
    user_data = stored_data['user_data']

    # 处理空日期值
    birth_date = user_data.get('birth_date')
    if birth_date == '' or not birth_date:
        birth_date = None

    # 存储用户信息到数据库
    conn = get_db_connection()
    if not conn:
        return jsonify({'success': False, 'message': '数据库连接失败'}), 500

    cursor = conn.cursor(dictionary=True)

    try:
        # 哈希处理密码
        hashed_password = hash_password(user_data['password'])

        # 插入用户数据
        query = """
        INSERT INTO users (email, password, name, gender, birth_date)
        VALUES (%s, %s, %s, %s, %s)
        """
        cursor.execute(query, (
            user_data['email'],
            hashed_password,
            user_data['name'],
            user_data['gender'],
            birth_date  # 使用处理过的birth_date值
        ))

        conn.commit()

        # 清除验证码
        del verification_codes[email]

        return jsonify({
            'success': True,
            'message': '注册成功，请登录系统'
        })

    except Exception as e:
        conn.rollback()
        return jsonify({'success': False, 'message': f'注册失败: {str(e)}'}), 500

    finally:
        cursor.close()
        close_connection(conn)


# 在routes/auth.py现有代码的底部添加

@auth.route('/login', methods=['POST'])
def login():
    """用户登录接口"""
    data = request.get_json()

    if not all(k in data for k in ('email', 'password')):
        return jsonify({'success': False, 'message': '请输入邮箱和密码'}), 400

    email = data['email']
    password = data['password']

    # 连接数据库
    conn = get_db_connection()
    if not conn:
        return jsonify({'success': False, 'message': '数据库连接失败'}), 500

    cursor = conn.cursor(dictionary=True)

    try:
        # 查询用户
        cursor.execute("SELECT id, email, password, name FROM users WHERE email = %s", (email,))
        user = cursor.fetchone()

        if not user:
            return jsonify({'success': False, 'message': '用户不存在'}), 404

        # 验证密码
        if not check_password(user['password'], password):
            return jsonify({'success': False, 'message': '密码错误'}), 401

        # 创建会话
        session['user_id'] = user['id']
        session['user_info'] = {
            'id': user['id'],
            'email': user['email'],
            'name': user['name']
        }

        return jsonify({
            'success': True,
            'message': '登录成功',
            'user': {
                'id': user['id'],
                'email': user['email'],
                'name': user['name']
            }
        })

    except Exception as e:
        print(f"登录错误: {str(e)}")  # 添加错误日志
        return jsonify({'success': False, 'message': f'登录失败: {str(e)}'}), 500

    finally:
        cursor.close()
        close_connection(conn)


@auth.route('/logout')
def logout():
    """用户登出接口"""
    from flask import session
    # 清除会话
    session.pop('user_id', None)
    session.pop('user_info', None)
    return jsonify({'success': True, 'message': '已成功登出'})