from flask import render_template, request, flash, redirect, url_for
from typing import Dict

from .get_db import get_db
from .verify_user import verify_user


class ModifyInfo:
    def __init__(self, form:Dict[str, str]):
        self.id = form['cardCode']
        modifyType = form['modifyType']
        self.new_password = form['encryptedNewPassword']
        self.phone_number = form['mobileNo']
        modifyType2command = {
            '1':'delete account',
            '2':'modify Password',
            '3':'modify Phone_Number'
        }
        self.sql_dict = {
            'delete account': 'DELETE FROM passengers WHERE ID = %s;',
            'modify Password': 'UPDATE passengers SET `Password` = %s WHERE ID = %s;',
            'modify Phone_Number': 'UPDATE passengers SET Phone_number = %s WHERE ID = %s;'
        }
        self.sql_args_dict = {
            'delete account': (self.id,),
            'modify Password': (self.new_password, self.id),
            'modify Phone_Number': (self.phone_number, self.id)
        }
        self.ok_message_dict = {
            'delete account': "删除账户成功",
            'modify Password': "修改密码成功",
            'modify Phone_Number': "修改手机号成功"
        }
        self.fail_message_dict = {
            'delete account': "数据库异常，删除账户失败",
            'modify Password': "数据库异常，修改密码失败",
            'modify Phone_Number': "数据库异常，修改手机号失败"
        }
        self.command = modifyType2command[modifyType]
    def get_sql(self):
        return self.sql_dict[self.command]
    def get_args(self):
        return self.sql_args_dict[self.command]
    def get_ok_message(self):
        return self.ok_message_dict[self.command]
    def get_fail_message(self):
        return self.fail_message_dict[self.command]

def modify():
    if request.method == 'GET':
        return render_template('modify.html')
    
    if request.method == 'POST':
        id = request.form['cardCode']
        password = request.form['encryptedPassword']
        db = get_db()
        cursor = db.cursor()

        verify_info = verify_user(cursor, id, password)
        if (verify_info == "NO_USER"):
            flash("您未注册过，无法修改账号")
            db.close()
            return redirect(url_for('signup'))
        elif (verify_info == "WRONG_PASSWORD"):
            flash("密码错误")
            db.close()
            return redirect(url_for('modify'))

        modifyInfo = ModifyInfo(request.form)
        try:
            cursor.execute(modifyInfo.get_sql(), modifyInfo.get_args())
            db.commit()
            flash(modifyInfo.get_ok_message())
        except Exception as e:
            db.rollback()
            print(e)
            flash(modifyInfo.get_fail_message())
        db.close()
        return redirect(url_for('index'))