from flask import request, jsonify, session, url_for, render_template
from .config import db, slideshow_images
import pymysql


def connect(mobileNo, encrypted_password):
    conn = pymysql.connect(**db)
    cursor = conn.cursor(pymysql.cursors.DictCursor)
    args = (mobileNo, encrypted_password)
    verify_sql = "SELECT Phone_number FROM Users WHERE Phone_number = %s AND `Password` = %s;"
    cursor.execute(verify_sql, args)
    user = cursor.fetchone()
    cursor.close()
    conn.close()
    return user

def login():
    if request.method == 'GET':
        images = slideshow_images
        return render_template('login.html', images=images)

    if request.method == 'POST':
        session.pop('user_id', None)
        mobileNo = request.json.get('username')
        encrypted_password = request.json.get('password')
        try:
            user = connect(mobileNo, encrypted_password)
            if not user:
                return jsonify({'message': '用户不存在，请点击注册按钮注册'}), 401
            session['user_id'] = mobileNo
            session.modified = True
            return jsonify({'redirect': url_for('index')})
        except Exception as e:
            print(e)
            return jsonify({'message': '数据库错误，请稍后再试'}), 500