#!/usr/bin/env node

var app = require('../app');
var debug = require('debug')('bus-gateway:server');
var http = require('http');
var axios = require('axios');
var config = require('../config');

var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

var server = http.createServer(app);

const HAPI_HEALTH_URL = `${config.fhir.url}/metadata`;
const RETRY_DELAY_MS = 5000;
const MAX_ATTEMPTS = 36; // 3 minutos máximo

async function waitForHapi() {
    for (let attempt = 1; attempt <= MAX_ATTEMPTS; attempt++) {
        try {
            await axios.get(HAPI_HEALTH_URL, { timeout: 5000 });
            console.log(`[${new Date().toISOString()}] HAPI FHIR está listo`);
            return;
        } catch {
            console.log(`[${new Date().toISOString()}] Esperando HAPI FHIR (intento ${attempt}/${MAX_ATTEMPTS})...`);
            await new Promise(resolve => setTimeout(resolve, RETRY_DELAY_MS));
        }
    }
    console.error(`[${new Date().toISOString()}] HAPI FHIR no respondió en el tiempo máximo de espera`);
    process.exit(1);
}

waitForHapi().then(() => {
    server.listen(port);
    server.on('error', onError);
    server.on('listening', onListening);
});

function normalizePort(val) {
    var port = parseInt(val, 10);
    if (isNaN(port)) return val;
    if (port >= 0) return port;
    return false;
}

function onError(error) {
    if (error.syscall !== 'listen') throw error;
    var bind = typeof port === 'string' ? 'Pipe ' + port : 'Port ' + port;
    switch (error.code) {
        case 'EACCES':
            console.error(bind + ' requires elevated privileges');
            process.exit(1);
            break;
        case 'EADDRINUSE':
            console.error(bind + ' is already in use');
            process.exit(1);
            break;
        default:
            throw error;
    }
}

function onListening() {
    var addr = server.address();
    var bind = typeof addr === 'string' ? 'pipe ' + addr : 'port ' + addr.port;
    debug('Listening on ' + bind);
    console.log(`[${new Date().toISOString()}] bus-gateway escuchando en ${bind}`);
}