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utilities.js
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utilities.js
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const MYSQL = require('mysql');
const INQUIRER = require('inquirer');
const { table } = require('table');
require('colors');
const QUESTIONS = {
Prompt: function (type, message, name) {
this.type = type;
this.message = message;
this.name = name;
},
ask: function (promptObj) {
return INQUIRER
.prompt(promptObj)
.then(res => { return res; });
},
askConfirm: async function (message) {
const confirmPrompt = new this.Prompt('confirm', message, 'confirm');
const res = await this.ask({ ...confirmPrompt });
return res.confirm;
},
askNumUntil: async function (message, condition, err) {
const numPrompt = new this.Prompt('number', message, 'num');
let number;
do {
const ans = await this.ask({ ...numPrompt });
const bool = condition(ans.num);
if (bool) {
number = ans.num;
} else {
console.log(err.red);
}
} while (number === undefined);
return number;
},
askInt: async function (message) {
const bool = (ans) => ans >= 0 && Number.isInteger(ans);
const err = 'Please enter an integer 0 or greater.';
const quant = await this.askNumUntil(message, bool, err);
return quant;
},
askPrice: async function (message) {
const bool = (ans) => ans > 0;
const err = 'Please enter a positive number greater than 0.';
const price = await this.askNumUntil(message, bool, err);
return price.toFixed(2);
},
askID: async function (res, message) {
const condition = UTIL.validateID(res);
const id = await QUESTIONS.askNumUntil(message, condition, 'Your ID was not valid, please try again.');
return id;
},
askList: async function (arr) {
const actionPrompt = new this.Prompt('list', 'What would you like to do?', 'action');
actionPrompt.choices = [...arr];
const res = await this.ask({ ...actionPrompt });
return res.action;
},
askName: async function (res, message, regex, regexErr, prop) {
const namePrompt = new QUESTIONS.Prompt('input', message, 'name');
const allNames = res.map(x => x[prop]);
let name;
do {
const ans = await QUESTIONS.ask({ ...namePrompt });
const regexTest = regex.test(ans.name);
const isSame = allNames.indexOf(ans.name) > -1;
const resLength = ans.name.length;
if (!regexTest && !isSame && resLength <= 70) {
name = ans;
} else {
let error = '';
if (isSame) { error += `The product '${ans.name}' already exists. Please enter a different name. `; }
if (regexTest) { error += regexErr; }
if (resLength > 70) { error += 'Names can only be 70 characters long, please enter a shorter name. '; }
console.log(error.red);
}
} while (name === undefined);
return name.name;
}
};
const DB = {
connect: async function (sql, args) {
const connectObj = { host: 'localhost', port: 3306, user: 'root', password: 'wp8177', database: 'bamazon_DB' };
const connection = MYSQL.createConnection(connectObj);
const query = await this.query(connection, sql, args);
return query;
},
selectAll: async function () {
const sql = 'SELECT * FROM products';
const res = await this.connect(sql, []);
return res;
},
selectAllDepts: async function () {
const sql = 'SELECT * FROM departments';
const res = await this.connect(sql, []);
return res;
},
getByID: async function (id) {
const objSql = 'SELECT * FROM products WHERE ?';
const objGet = await this.connect(objSql, [{ id: id }]);
return objGet[0];
},
setItems: async function (args) {
const sqlUpdate = 'UPDATE products SET ? WHERE ?';
this.connect(sqlUpdate, args);
},
query: function (connection, sql, args) {
return new Promise((resolve, reject) => {
connection.query(sql, args, function (err, res) {
if (err) throw err;
resolve(UTIL.parse(res));
connection.end();
});
}).then(res => { return res; });
}
};
const UTIL = {
parse: (res) => JSON.parse(JSON.stringify(res)),
displayTable: function (arr, res) {
const productTable = this.tableFromJSON(arr, res);
console.log('\n' + productTable);
},
validateID: function (res) {
return function (val) {
const arr = res.map(x => x.id);
return arr.indexOf(val) > -1;
};
},
filterByID: function (res, val) {
const arr = res.filter(x => x.id === val);
return arr[0];
},
tableFromJSON: function (headerArr, json) {
const header = headerArr.map(x => x.cyan);
const arr = json.map(x => {
let data = [];
for (const prop in x) {
if (x.hasOwnProperty(prop)) {
data = data.concat(x[prop]);
}
}
return data;
});
const final = [header].concat(arr);
return table(final, this.tableConfig);
},
productsHeader: ['ID', 'Product Name', 'Dept', 'Price', 'Stock', 'Total Sales'],
tableConfig: {
border: {
topBody: `─`.grey,
topJoin: `┬`.grey,
topLeft: `┌`.grey,
topRight: `┐`.grey,
bottomBody: `─`.grey,
bottomJoin: `┴`.grey,
bottomLeft: `└`.grey,
bottomRight: `┘`.grey,
bodyLeft: `│`.grey,
bodyRight: `│`.grey,
bodyJoin: `│`.grey,
joinBody: `─`.grey,
joinLeft: `├`.grey,
joinRight: `┤`.grey,
joinJoin: `┼`.grey
}
}
};
module.exports = {
util: UTIL,
questions: QUESTIONS,
database: DB
};