const express = require('express');
const fs = require('fs');
const path = require('path');

const app = express();
const PORT = 6000;

app.set('view engine', 'ejs');
app.use(express.static(path.join(__dirname, 'public')));
app.use(express.urlencoded({ extended: true }));

const tinycolor = require("tinycolor2");

app.locals.getTextColor = function (bgColor) {
  // Use tinycolor package or simple logic:
  // Return black for light colors, white for dark
  const c = tinycolor(bgColor);
  return c.isLight() ? "#000" : "#fff";
};

const dataFile = path.join(__dirname, 'data', 'spools.json');

function loadSpools() {
  return JSON.parse(fs.readFileSync(dataFile));
}

function saveSpools(spools) {
  fs.writeFileSync(dataFile, JSON.stringify(spools, null, 2));
}

app.get('/', (req, res) => {
  const spools = loadSpools();
  res.render('index', { spools });
});

app.post('/update', (req, res) => {
  const { index, initial, used, color } = req.body;
  const spools = loadSpools();

  const i = parseInt(index, 10);
  if (spools[i]) {
    spools[i].initial = parseFloat(initial);
    spools[i].used = parseFloat(used);
    spools[i].color = color;
  }
  saveSpools(spools);
  res.redirect('/');
});
app.get('/api/spool/:index', (req, res) => {
  const spools = loadSpools();
  const index = parseInt(req.params.index, 10);
  if (spools[index]) {
    res.json(spools[index]);
  } else {
    res.status(404).json({ error: 'Spool not found' });
  }
});

app.listen(PORT, () => {
  console.log(`Filament Tracker running at http://localhost:${PORT}`);
});