from flask import *
from markupsafe import escape
from Login import check_username_availability, verify_user, add_user, get_expiry_date, change_password, WarningMessage


# 初始化蓝图
accountService = Blueprint("accountService", __name__)

### Sign-up, login, logout ###
@accountService.route("/signup", methods=['GET', 'POST'])
def signup():
    '''
    注册
    :return: 根据注册是否成功返回不同界面
    '''
    if request.method == 'GET':
        # GET方法直接返回注册页面
        return render_template('signup.html')
    elif request.method == 'POST':
        # POST方法需判断是否注册成功，再根据结果返回不同的内容
        username = escape(request.form['username'])
        password = escape(request.form['password'])
        
        #! 添加如下代码为了过滤注册时的非法字符
        warn = WarningMessage(username)
        if str(warn) != 'OK':
            return jsonify({'status': '3', 'warn': str(warn)})
        
        available = check_username_availability(username)
        if not available: # 用户名不可用
            return jsonify({'status': '0'})
        else: # 添加账户信息
            add_user(username, password)
            verified = verify_user(username, password)
            if verified:
                # 写入session
                session['logged_in'] = True
                session[username] = username
                session['username'] = username
                session['expiry_date'] = get_expiry_date(username)
                session['visited_articles'] = None
                return jsonify({'status': '2'})
            else:
                return jsonify({'status': '1'})



@accountService.route("/login", methods=['GET', 'POST'])
def login():
    '''
    登录
    :return: 根据登录是否成功返回不同页面
    '''
    if request.method == 'GET':
        # GET请求
        return render_template('login.html')
    elif request.method == 'POST':
        # POST方法用于判断登录是否成功
        # check database and verify user
        username = escape(request.form['username'])
        password = escape(request.form['password'])
        verified = verify_user(username, password)
        if verified:
            # 登录成功，写入session
            session['logged_in'] = True
            session[username] = username
            session['username'] = username
            user_expiry_date = get_expiry_date(username)
            session['expiry_date'] = user_expiry_date
            session['visited_articles'] = None
            return jsonify({'status': '1'})
        else:
            return jsonify({'status': '0'})


@accountService.route("/logout", methods=['GET', 'POST'])
def logout():
    '''
    登出
    :return: 重定位到主界面
    '''
    # 将session标记为登出状态
    session['logged_in'] = False
    return redirect(url_for('mainpage'))


@accountService.route("/reset", methods=['GET', 'POST'])
def reset():
    '''
    重设密码
    :return: 返回适当的页面
    '''
    # 下列方法用于防止未登录状态下的修改密码
    if not session.get('logged_in'):
        return render_template('login.html')
    username = session['username']
    if username == '':
        return redirect('/login')
    if request.method == 'GET':
        # GET请求返回修改密码页面
        return render_template('reset.html', username=session['username'], state='wait')
    else:
        # POST请求用于提交修改后信息
        old_password = escape(request.form['old-password'])
        new_password = escape(request.form['new-password'])
        flag = change_password(username, old_password, new_password) # flag表示是否修改成功
        if flag:
            session['logged_in'] = False
            return jsonify({'status':'1'})  # 修改成功
        else:
            return jsonify({'status':'2'})  # 修改失败