/*
 * Copyright (c) 2012 Trent Mick. All rights reserved.
 *
 * If available, test dtrace support.
 */

var spawn = require('child_process').spawn;
var format = require('util').format;

var test = require('tap').test;
var bunyan = require('../lib/bunyan');


// Determine if we can run the dtrace tests.
var dtracePlats = ['sunos', 'darwin', 'freebsd'];
var runDtraceTests = true;
try {
  require('dtrace-provider')
} catch (e) {
  console.log('# skip dtrace tests: no dtrace-provider module');
  runDtraceTests = false;
}
if (!runDtraceTests) {
  /* pass through */
} else if (dtracePlats.indexOf(process.platform) === -1) {
  console.log('# skip dtrace tests: not on a platform with dtrace');
  runDtraceTests = false;
} else if (process.env.SKIP_DTRACE) {
  console.log('# skip dtrace tests: SKIP_DTRACE envvar set');
  runDtraceTests = false;
} else if (process.getgid() !== 0) {
  console.log('# skip dtrace tests: gid is not 0, run with `sudo`');
  runDtraceTests = false;
}
if (runDtraceTests) {


test('basic dtrace', function (t) {
  var argv = ['dtrace', '-Z', '-x', 'strsize=4k', '-qn',
    'bunyan$target:::log-*{printf("%s", copyinstr(arg0))}',
    '-c', format('node %s/log-some.js', __dirname)];
  var dtrace = spawn(argv[0], argv.slice(1));
  //console.error("ARGV: %j", argv);

  var traces = [];
  dtrace.stdout.on('data', function (data) {
    //console.error("DTRACE STDOUT:", data.toString());
    traces.push(data.toString());
  });
  dtrace.stderr.on('data', function (data) {
    console.error("DTRACE STDERR:", data.toString());
  });
  dtrace.on('exit', function (code) {
    t.notOk(code, 'dtrace exited cleanly');
    traces = traces.join('').split('\n')
      .filter(function (t) { return t.trim().length })
      .map(function (t) { return JSON.parse(t) });
    t.equal(traces.length, 2, 'got 2 log records');
    if (traces.length) {
      t.equal(traces[0].level, bunyan.DEBUG);
      t.equal(traces[0].foo, 'bar');
      t.equal(traces[1].level, bunyan.TRACE);
      t.equal(traces[1].msg, 'hi at trace');
    }
    t.end();
  });
});


} /* end of `if (runDtraceTests)` */