const next = require('next');
const { createServer } = require('http');
const { stat, mkdir } = require('fs/promises');
const { execSync } = require('child_process');
const { extname } = require('path');
const { red, green, bold } = require('colorette');
const { PrismaClient } = require('@prisma/client');
const validateConfig = require('./validateConfig');
const Logger = require('../src/lib/logger');
const getFile = require('./static');
const prismaRun = require('../scripts/prisma-run');
const readConfig = require('../src/lib/readConfig');
const mimes = require('../scripts/mimes');
const deployDb = require('../scripts/deploy-db');
const { version } = require('../package.json');

Logger.get('server').info(`starting zipline@${version} server`);

const dev = process.env.NODE_ENV === 'development';

function log(url, status) {
  if (url.startsWith('/_next') || url.startsWith('/__nextjs')) return;
  return Logger.get('url').info(`${status === 200 ? bold(green(status)) : bold(red(status))}: ${url}`);
}

function shouldUseYarn() {
  try {
    execSync('yarnpkg --version', { stdio: 'ignore' });
    return true;
  } catch (e) {
    return false;
  }
}

(async () => {
  try {
    const a = readConfig();
    const config = await validateConfig(a);

    const data = await prismaRun(config.core.database_url, ['migrate', 'status'], true);
    if (data.match(/Following migrations? have not yet been applied/)) {
      Logger.get('database').info('some migrations are not applied, applying them now...');
      await deployDb(config);
      Logger.get('database').info('finished applying migrations');
    } else Logger.get('database').info('migrations up to date');
    process.env.DATABASE_URL = config.core.database_url;

    await mkdir(config.uploader.directory, { recursive: true });

    const app = next({
      dir: '.',
      dev,
      quiet: dev,
    }, config.core.port, config.core.host);

    await app.prepare();
    await stat('./.next');

    const handle = app.getRequestHandler();
    const prisma = new PrismaClient();
  
    const srv = createServer(async (req, res) => {
      if (req.url.startsWith('/r')) {
        const parts = req.url.split('/');
        if (!parts[2] || parts[2] === '') return;

        let image = await prisma.image.findFirst({
          where: {
            OR: [
              { file: parts[2] },
              { invisible:{ invis: decodeURI(parts[2]) } },
            ],
          },
          select: {
            mimetype: true,
            id: true,
            file: true,
            invisible: true,
          },
        });

        if (!image) {
          const data = await getFile(config.uploader.directory, parts[2]);
          if (!data) return app.render404(req, res);

          const mimetype = mimes[extname(parts[2])] ?? 'application/octet-stream';
          res.setHeader('Content-Type', mimetype);
          res.end(data);
        } else {
          if (image) {
            const data = await getFile(config.uploader.directory, image.file);
            if (!data) return app.render404(req, res);

            await prisma.image.update({
              where: { id: image.id },
              data: { views: { increment: 1 } },
            });
            res.setHeader('Content-Type', image.mimetype);
            res.end(data);
          } else {
            const data = await getFile(config.uploader.directory, parts[2]);
            if (!data) return app.render404(req, res);
  
            const mimetype = mimes[extname(parts[2])] ?? 'application/octet-stream';
            res.setHeader('Content-Type', mimetype);
            res.end(data);
          }

        }
      } else {
        handle(req, res);
      }

      log(req.url, res.statusCode);
    });

    srv.on('error', (e) => {
      Logger.get('server').error(e);

      process.exit(1);
    });
    srv.on('listening', () => {
      Logger.get('server').info(`listening on ${config.core.host}:${config.core.port}`);
      if (process.platform === 'linux' && dev) execSync(`xdg-open ${config.core.secure ? 'https' : 'http'}://${config.core.host === '0.0.0.0' ? 'localhost' : config.core.host}:${config.core.port}`);
    });

    srv.listen(config.core.port, config.core.host ?? '0.0.0.0');
  } catch (e) {
    if (e.message && e.message.startsWith('Could not find a production')) {
      Logger.get('web').error(`there is no production build - run \`${shouldUseYarn() ? 'yarn build' : 'npm build'}\``);
    } else if (e.code && e.code === 'ENOENT') {
      if (e.path === './.next') Logger.get('web').error(`there is no production build - run \`${shouldUseYarn() ? 'yarn build' : 'npm build'}\``);
    } else {
      Logger.get('server').error(e);
      process.exit(1);
    }
  }
})();