'use strict';

const test = require('tap').test;
const log4js = require('../../lib/log4js');
const sandbox = require('sandboxed-module');

function setupLogging(category, options) {
  const udpSent = {};

  const fakeDgram = {
    createSocket: function () {
      return {
        send: function (buffer, offset, length, port, host, callback) {
          udpSent.date = new Date();
          udpSent.host = host;
          udpSent.port = port;
          udpSent.length = length;
          udpSent.offset = 0;
          udpSent.buffer = buffer;
          callback(undefined, length);
        }
      };
    }
  };

  const logstashModule = sandbox.require('../../lib/appenders/logstashUDP', {
    singleOnly: true,
    requires: {
      dgram: fakeDgram
    }
  });
  log4js.clearAppenders();
  log4js.addAppender(logstashModule.configure(options), category);

  return {
    logger: log4js.getLogger(category),
    results: udpSent
  };
}

test('logstashUDP appender', (batch) => {
  batch.test('a UDP packet should be sent', (t) => {
    const setup = setupLogging('myCategory', {
      host: '127.0.0.1',
      port: 10001,
      type: 'logstashUDP',
      logType: 'myAppType',
      category: 'myLogger',
      fields: {
        field1: 'value1',
        field2: 'value2'
      },
      layout: {
        type: 'pattern',
        pattern: '%m'
      }
    });
    setup.logger.log('trace', 'Log event #1');

    t.equal(setup.results.host, '127.0.0.1');
    t.equal(setup.results.port, 10001);
    t.equal(setup.results.offset, 0);

    const json = JSON.parse(setup.results.buffer.toString());
    t.equal(json.type, 'myAppType');
    const fields = {
      field1: 'value1',
      field2: 'value2',
      level: 'TRACE',
      category: 'myCategory'
    };
    t.equal(JSON.stringify(json.fields), JSON.stringify(fields));
    t.equal(json.message, 'Log event #1');
    // Assert timestamp, up to hours resolution.
    const date = new Date(json['@timestamp']);
    t.equal(
      date.toISOString().substring(0, 14),
      setup.results.date.toISOString().substring(0, 14)
    );

    t.end();
  });

  batch.test('default options', (t) => {
    const setup = setupLogging('myLogger', {
      host: '127.0.0.1',
      port: 10001,
      type: 'logstashUDP',
      category: 'myLogger',
      layout: {
        type: 'pattern',
        pattern: '%m'
      }
    });
    setup.logger.log('trace', 'Log event #1');

    const json = JSON.parse(setup.results.buffer.toString());
    t.equal(json.type, 'myLogger');
    t.equal(
      JSON.stringify(json.fields),
      JSON.stringify({ level: 'TRACE', category: 'myLogger' })
    );

    t.end();
  });

  batch.test('extra fields should be added to the fields structure', (t) => {
    const setup = setupLogging('myLogger', {
      host: '127.0.0.1',
      port: 10001,
      type: 'logstashUDP',
      category: 'myLogger',
      layout: {
        type: 'dummy'
      }
    });
    setup.logger.log('trace', 'Log event #1', { extra1: 'value1', extra2: 'value2' });

    const json = JSON.parse(setup.results.buffer.toString());
    const fields = {
      extra1: 'value1',
      extra2: 'value2',
      level: 'TRACE',
      category: 'myLogger'
    };
    t.equal(JSON.stringify(json.fields), JSON.stringify(fields));
    t.end();
  });

  batch.end();
});