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// This ensures that things do not fail silently but will throw errors instead.
"use strict";
// Require better-sqlite.
const Database = require('better-sqlite3');

// Connect to a database or create one if it doesn't exist yet.
const db = new Database('user.db');

// Is the database initialized or do we need to initialize it?
const stmt = db.prepare(`
    SELECT name FROM sqlite_master WHERE type='table' and name='userinfo';`
    );
// Define row using `get()` from better-sqlite3
let row = stmt.get();
// Check if there is a table. If row is undefined then no table exists.
if (row === undefined) {
// Echo information about what you are doing to the console.
    console.log('Your database appears to be empty. I will initialize it now.');
// Set a const that will contain your SQL commands to initialize the database.
    const sqlInit = `
        CREATE TABLE userinfo ( id INTEGER PRIMARY KEY, username TEXT, password TEXT );
        INSERT INTO userinfo (username, password) VALUES ('user1','supersecurepassword'),('test','anotherpassword');
    `;
// Execute SQL commands that we just wrote above.
    db.exec(sqlInit);
// Echo information about what we just did to the console.
    console.log('Your database has been initialized with a new table and two entries containing a username and password.');
} else {
// Since the database already exists, echo that to the console.
    console.log('Database exists.')
}
// Export all of the above as a module so that we can use it elsewhere.
module.exports = db

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// Define app using express
var express = require("express")
var app = express()
// Require database SCRIPT file
const db = require("./database.js")
// Require md5 MODULE
//var md5 = require("md5")
// Make Express use its own built-in body parser for both urlencoded and JSON body data.
app.use(express.urlencoded({ extended: true }));
app.use(express.json());

// Server port
var HTTP_PORT = 5000 
// Start server
const server = app.listen(HTTP_PORT, () => {
    console.log("Server running on port %PORT%".replace("%PORT%",HTTP_PORT))
});
// READ (HTTP method GET) at root endpoint /app/
app.get("/app/", (req, res, next) => {
    res.json({"message":"Your API works! (200)"});
	res.status(200);
});

// Define other CRUD API endpoints using express.js and better-sqlite3
// CREATE a new user (HTTP method POST) at endpoint /app/new/
app.post("/app/new/user", (req, res, next) => {
    let data = {
        user: req.body.username,
        pass: req.body.password
    }
    const stmt = db.prepare('INSERT INTO userinfo (username, password) VALUES (?, ?)')
    const info = stmt.run(data.user, data.pass)
    res.status(200).json(info)
});
// READ a list of users (HTTP method GET) at endpoint /app/users/
app.get("/app/users", (req, res) => {	
    try {
        const stmt = db.prepare('SELECT * FROM userinfo').all()
        res.status(200).json(stmt)
    } catch {
        console.error(e)
    }
});

// READ a single user (HTTP method GET) at endpoint /app/user/:id
app.get("/app/user/:id", (req, res) => {
    try {
        const stmt = db.prepare('SELECT * FROM userinfo WHERE id = ?').get(req.params.id);
        res.status(200).json(stmt)
    } catch (e) {
        console.error(e)
    }

});

// UPDATE a single user (HTTP method PATCH) at endpoint /app/update/user/:id
app.patch("/app/update/user/:id", (req, res) => {
    let data = {
        user: req.body.username,
        pass: req.body.password
    }
    const stmt = db.prepare('UPDATE userinfo SET username = COALESCE(?,username), password = COALESCE(?,password) WHERE id = ?')
    const info = stmt.run(data.user, data.pass, req.params.id)
    res.status(200).json(info)
});

// DELETE a single user (HTTP method DELETE) at endpoint /app/delete/user/:id
app.delete("/app/delete/user/:id", (req, res) => {
    const stmt = db.prepare('DELETE FROM userinfo WHERE id = ?')
    const info = stmt.run(req.params.id)
    res.status(200).json(info)
});
// Default response for any other request
app.use(function(req, res){
	res.json({"message":"Endpoint not found. (404)"});
    res.status(404);
});

process.on('SIGTERM', () => {
    server.close(() => {
        console.log('Server stopped')
    })
})