const express = require('express');
const showdown = require('showdown');
const { query } = require('./dbHelper.js');
const { graphFromList } = require('./graphStuff.js');

const app = express.Router();
const converter = new showdown.Converter();

app.get('/pages', (req, res) => {
	query('select id, title from pages', [])
		.then((r) => r.rows)
		.then((row) => row.map(([id, title]) => {return {"id": id, "title": title};}))
		.then((pages) => res.status(200).json(pages))
		.catch((error) => res.status(500).json({"error": error}));
});

app.post('/page/new', (req, res) => {
	query('insert into pages (title, description) values (?, ?) returning id',
				["new page", "this page is new!"])
		.then((r) => r.rows[0])
		.then((row) => res.status(200).json({id: row[0]}))
		.catch((error) => res.status(500).json({"error": error}))
});

app.get('/page/:id', (req, res) => {
	query('select * from pages where id=?', [req.params.id])
    .then((r) => {
    	if (r.rows.length == 0) res.status(404).json({"error": "page not found in db"});
    	else return r.rows[0];
  }).then((row) => res.status(200).json(row))
    .catch((error) => res.status(500).json({"error": error}));
});

app.post('/page/:id', (req, res) => {
	const html = converter.makeHtml(req.body.description);
	query('replace into pages (id, title, description, html) values (?, ?, ?, ?)',
        [req.params.id, req.body.title, req.body.description, html])
    .then(() => res.status(200).json({}))
    .catch((error) => res.status(500).json({"error": error}));
});

app.delete('/page/:id', (req, res) => {
	query('delete from pages where id = ?', [req.params.id])
		.then(() => res.status(200).json({id: req.params.id}))
		.catch((error) => res.status(500).json({"error": error}))
})

app.get('/graph', (req, res) => {
	query('select id, html from pages', [])
		.then((r) => r.rows)
		.then((stuff) => graphFromList(stuff))
		.then((graph) => res.json(graph))
		.catch((error) => res.status(500).json({"error": error}));
});

module.exports = app;