const API = require("../../../lib/API");
const db = require("../../../plugin/DataBase/db");
const { BaseStdResponse } = require("../../../BaseStdResponse");
const AccessControl = require("../../../lib/AccessControl");

class ChangeUsername extends API {
    constructor() {
        super();

        this.setMethod("POST");
        this.setPath("/User/ChangeUsername");
    }

    checkUsername(username) {
        const regex = /^[\u4e00-\u9fa5A-Za-z0-9]{2,8}$/;
        return regex.test(username);
    }

    async onRequest(req, res) {
        let { uuid, session, username } = req.body;

        if ([uuid, session, username].some(value => value === '' || value === null || value === undefined)) {
            return res.json({
                ...BaseStdResponse.MISSING_PARAMETER,
                endpoint: 1513126
            });
        }

        if (!this.checkUsername(username))
            return res.json({
                ...BaseStdResponse.ERR,
                msg: '用户名需在2到8位之间，且只能含有英文字母和汉字'
            })

        // 检查 session 是否有效
        if (!await AccessControl.checkSession(uuid, session)) {
            return res.json({
                ...BaseStdResponse.ACCESS_DENIED,
                endpoint: 48153145
            });
        }

        let sql = 'SELECT username FROM users WHERE username = ?';
        let UserRows = await db.query(sql, [username]);
        if (UserRows.length > 0)
            return res.json({
                ...BaseStdResponse.USER_ALREADY_EXISTS,
                msg: '该用户名已被占用！'
            })

        sql = 'UPDATE users SET username = ? WHERE uuid = ?';
        let result = await db.query(sql, [username, uuid]);

        if (result && result.affectedRows > 0) {
            sql = 'SELECT wxid, avatar, email FROM users WHERE uuid = ?';
            let rows = await db.query(sql, [uuid]);
            if(!rows || rows.length === 0)
                return res.json({
                    ...BaseStdResponse.DATABASE_ERR
                })

            res.json({
                ...BaseStdResponse.OK,
                data: {
                    uuid,
                    username: username,
                    wxid: rows[0].wxid,
                    email: rows[0].email,
                    avatar: rows[0].avatar,
                    session
                }
            });
        } else {
            res.json({ ...BaseStdResponse.ERR, endpoint: 7894378, msg: '操作失败！' });
        }
    }
}

module.exports.ChangeUsername = ChangeUsername;