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 { JSDOM } = require("jsdom");

const hljs = require('highlight.js/lib/core');
hljs.registerLanguage('lua', require('highlight.js/lib/languages/lua'));

const { interpret } = require('../interpreter.js');

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 {
		let maxPage = db.prepare('select max(number) as maximum from pages').get()
		let newPageNumber = maxPage.maximum + 1;
		let newPage = db.prepare('insert into pages (number, title, description, author) values (?, ?, ?, ?) returning number')
			.get(newPageNumber, "new page", "this page is new!", req.session.characterId);

		let newAttributes = db.prepare('insert into attributes (number, contents) values (?, ?)')
			.run(newPageNumber, JSON.stringify({"parent": 3})); 
		res.status(200).json(newPageNumber);
	} catch (error) {
		res.status(500).json({"error": error});
	}
});

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

		let char = req.session?.characterId || process.env.GHOST_CHARACTER_OBJECT;

		console.log("getting page ", req.params.number);

		const jd = new JSDOM(page.html);
		for (const executable of jd.window.document.querySelectorAll(".execute-me")) {
			const result = await interpret(req.params.number, char, executable.innerHTML);
			executable.innerHTML = result;
		}

		page.html = jd.serialize()
		
		res.status(200).json(page);
  } catch (error) {
  	res.status(500).json({"error": error});
  }
});
const getAttributesQuery = db.prepare('select * from attributes where number=?');
app.get('/page/:number/attributes', (req, res) => {
	try {
		const page = getPageQuery.get(req.params.number);
		if (!page) {
			res.status(404).json({"error": "page not found"});
			return;
		}

		const attributes = getAttributesQuery.get(req.params.number);
		if (!attributes) res.status(200).json({});
		else if (attributes.contents) res.status(200).json(JSON.parse(attributes.contents));
		else res.status(200).json({});

  } catch (error) {
  	res.status(500).json({"error": error});
  }
});

const pageInsertQuery = db.prepare('insert into pages (number, title, description, html, lua, author, type) values (?, ?, ?, ?, ?, ?, ?)')
app.post('/page/:number', loginRequired, (req, res) => {
	try {
		const html = converter.makeHtml(req.body.description);
		const lua =  hljs.highlight(req.body.description, {language: 'lua'}).value;

		const changes = pageInsertQuery.run(req.params.number, req.body.title, req.body.description, html, lua, req.session.characterId, req.body.type ? 1 : 0);
		res.status(200).json(changes);
	} catch (error) {
		console.log(error);
    res.status(500).json({"error": error});
 	}
});

const attributesUpdateQuery = db.prepare('update attributes set contents=? where number=?')
app.post('/page/:number/attributes', loginRequired, (req, res) => {
	try {
		const changes = attributesUpdateQuery.run(req.body, req.params.number);
		res.status(200).json(changes);
	} catch (error) {
		res.status(500).json({"error": error});
	}
})

app.delete('/page/:number', loginRequired, (req, res) => {
	try {
		db.prepare('delete from pages where number = ?').run(req.params.number);
		db.prepare('delete from attributes 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;