try {
  const newrelic = require('newrelic');
} catch (e) {
  console.error("WARNING unable to load newrelic")
}

const express = require('express');
const uuid = require('uuid/v4');
const sanitize = require('sanitize-filename');
const Canvas = require('canvas');

const Fox = require('./js/fox.js');
const renderFox = require('./js/render-fox.js');

function composeImage(width, height, seed) {
    seed = seed || uuid();
    const fox = Fox(width, height, seed);
    const canvas = new Canvas(width, height);
    renderFox(canvas, fox);
    return canvas;
};

const app = express();

const cacheTimeout = 60 * 60 * 24 * 30;

app.get('/healthcheck', (req, res) => {
    res.status(200).end();
});

app.get('/:width/:seed', (req, res) => {
    let width = parseInt(req.params.width) || 400;
    if (width > 400) width = 400;
    const seed = sanitize(req.params.seed) || uuid();
    const canvas = composeImage(width, width, seed);
    const buffer = canvas.toBuffer();
    res.set('Cache-Control', 'max-age=' + cacheTimeout);
    res.set('Content-length', buffer.length);
    res.type('png');
    res.end(buffer, 'binary');
});

app.listen(process.env.PORT || 3000, () => {
    console.log('listening on http://localhost:3000');
});