const express = require('express');
const app = express.Router();

const sqlite = require('better-sqlite3');
const db = new sqlite('the_big_db.db', { verbose: console.log });

const { loginRequired } = require('../authStuff.js');

const showdown = require('showdown');
const converter = new showdown.Converter();

const pageListQuery = db.prepare(`
	select p.number, p.title, p.time 
	from pages p
	where time >= (
		select max(s.time) 
		from pages s
		where s.number = p.number
	)
	order by p.time desc
	`);
app.get('/pages', (req, res) => {
	try {
		const pages = pageListQuery.all();
		res.status(200).json(pages);
	} catch (error) {
		res.status(500).json({"error": error});
	}	
});

app.post('/page/new', loginRequired, (req, res) => {
	try {
		const maxPage = db.prepare('select max(number) as maximum from pages').get()
		const newPageNumber = maxPage.maximum + 1;
		const newPage = db.prepare('insert into pages (number, title, description, author) values (?, ?, ?, ?) returning number')
			.get(newPageNumber, "new page", "this page is new!", req.session.userId);
		res.status(200).json(newPageNumber);
	} catch (error) {
		res.status(500).json({"error": error});
	}
});

app.get('/page/:number', (req, res) => {
	try {
		const page = db.prepare('select * from pages where number=:number order by time desc').get(req.params);
		if (page === undefined) res.status(404).json({"error": "page not found"});
		else res.status(200).json(page);
  } catch (error) {
  	res.status(500).json({"error": error});
  }
});

app.post('/page/:number', loginRequired, (req, res) => {
	try {
		const html = converter.makeHtml(req.body.description);
		const changes = db.prepare('insert into pages (number, title, description, html, author) values (?, ?, ?, ?, ?)')
			.run(req.params.number, req.body.title, req.body.description, html, req.session.userId);
		res.status(200).json(changes);
	} catch (error) {
    	res.status(500).json({"error": error});
 	}
});

app.delete('/page/:number', loginRequired, (req, res) => {
	try {
		const changes = db.prepare('delete from pages where number = ?').run(req.params.number);
		res.status(200).json({id: req.params.id});
	} catch (error) {
		res.status(500).json({"error": error});
	}
});

app.get('/page/:number/history', (req, res) => {
	try {
		const all = db.prepare('select * from pages where number=:number order by time desc').all(req.params);
		res.status(200).json(all);
	} catch (error) {
		res.status(500).json({"error": error});
	}
});
app.get('/page/:number/:id', (req, res) => {
	try {
		const page = db.prepare('select * from pages where number=:number and id=:id').get(req.params);
		if (page === undefined) res.status(404).json({"error": "page not found"});
		else res.status(200).json(page);
	} catch (error) {
		res.status(500).json({"error": error});
	}
});

module.exports = app;