const fastify = require('fastify')({ logger: true })
const { nanoid } = require('nanoid')
const knex = require('knex')({
    client: 'sqlite3',
    connection: {
        filename: "./dev.sqlite3"
    }
});

//Basic home route
fastify.get('/', async (request, reply) => {
    return { hello: 'world' }
})

//Automagic Amazn redirects on /a/
fastify.get('/a/:id', async (req, res) => {
    res.redirect(302, `https://amazon.de/dp/${req.params.id}`)
})

//Automagic Youtube redirects on /yt/
fastify.get('/yt/:id', async (req, res) => {
    res.redirect(302, `https://youtu.be/${req.params.id}`)
})

//Normal shorturls
fastify.get('/:shortcode', async (req, res) => {
    const shortcode = req.params.shortcode;
    if (!shortcode) {
        return 404;
    }
    const target = await knex.select('target')
        .from('urls')
        .where('shortcode', '=', shortcode)
        .limit(1);
    if (!target[0]) {
        return 404
    }
    res.redirect(302, target[0].target)
})

//Create new urls
const newUrlSchema = {
    body: {
        type: 'object',
        properties: {
            target: { type: 'string' },
            shortcode: { type: 'string' },
        }
    }
};

fastify.post('/new', { newUrlSchema }, async (req, res) => {
    const target = req.body?.target;
    let shortcode = req.body?.shortcode;
    if (!target) {
        res.statusCode = 400;
        return "Missing target";
    }

    if (!shortcode) {
        const exists = await knex.select('shortcode')
            .from('urls')
            .where('target', '=', target)
            .limit(1);
        if (exists.length != 0) {
            shortcode = exists[0].shortcode;
            return {
                url: `http://localhost:3000/${shortcode}`,
                shortcode,
                target
            }
        }
        shortcode = nanoid(12);
    }
    else {
        const exists = await knex.select('shortcode')
            .from('urls')
            .where('shortcode', '=', shortcode)
            .limit(1);
        if (exists.length != 0) {
            res.statusCode = 400;
            return "Shortcode already exists, please choose another code";
        }
    }
    await knex('urls').insert({target, shortcode});

    return {
        url: `http://localhost:3000${shortcode}`,
        shortcode,
        target
    }
})

// Run the server!
const start = async () => {
    try {
        await fastify.listen(3000)
    } catch (err) {
        fastify.log.error(err)
        process.exit(1)
    }
}
start()