const express = require('express');
const {
  listAssets,
  getPrices,
  buildQuote,
  getStatus
} = require('./price_engine');

const router = express.Router();

function sendError(res, status, message, extra = {}) {
  return res.status(status).json({
    ok: false,
    error: message,
    ...extra
  });
}

router.get('/health', (req, res) => {
  try {
    return res.json({
      ok: true,
      service: 'otb-oracle',
      version: '0.1.0',
      time_utc: new Date().toISOString(),
      status: 'healthy'
    });
  } catch (err) {
    return sendError(res, 500, 'health_failed', { detail: err.message });
  }
});

router.get('/assets', (req, res) => {
  try {
    return res.json(listAssets());
  } catch (err) {
    return sendError(res, 500, 'assets_failed', { detail: err.message });
  }
});

router.get('/prices', (req, res) => {
  try {
    return res.json(getPrices());
  } catch (err) {
    return sendError(res, 500, 'prices_failed', { detail: err.message });
  }
});

router.get('/price/:pairKey', (req, res) => {
  try {
    const pairKey = String(req.params.pairKey || '').trim().toUpperCase();
    const prices = getPrices();
    const asset = prices.assets?.[pairKey];

    if (!asset) {
      return sendError(res, 404, 'asset_not_found', { pair_key: pairKey });
    }

    return res.json(asset);
  } catch (err) {
    return sendError(res, 500, 'price_lookup_failed', { detail: err.message });
  }
});

router.get('/quote', (req, res) => {
  try {
    const fiat = req.query.fiat || 'CAD';
    const amount = req.query.amount;

    if (amount === undefined || amount === null || amount === '') {
      return sendError(res, 400, 'missing_amount');
    }

    const quote = buildQuote({ fiat, amount });
    return res.json(quote);
  } catch (err) {
    return sendError(res, 400, 'quote_failed', { detail: err.message });
  }
});

router.get('/status', (req, res) => {
  try {
    return res.json(getStatus());
  } catch (err) {
    return sendError(res, 500, 'status_failed', { detail: err.message });
  }
});

module.exports = router;