"use strict";
var vows = require('vows')
, fs = require('fs')
, path = require('path')
, sandbox = require('sandboxed-module')
, log4js = require('../lib/log4js')
, assert = require('assert')
, EOL = require('os').EOL || '\n';

log4js.clearAppenders();

function remove(filename) {
  try {
    fs.unlinkSync(filename);
  } catch (e) {
    //doesn't really matter if it failed
  }
}

vows.describe('log4js fileSyncAppender').addBatch({
  'with default fileSyncAppender settings': {
    topic: function() {
      var that = this
      , testFile = path.join(__dirname, '/fa-default-sync-test.log')
      , logger = log4js.getLogger('default-settings');
      remove(testFile);

      log4js.clearAppenders();
      log4js.addAppender(require('../lib/appenders/fileSync').appender(testFile), 'default-settings');
      
      logger.info("This should be in the file.");
      
      fs.readFile(testFile, "utf8", that.callback);
    },
    'should write log messages to the file': function (err, fileContents) {
      assert.include(fileContents, "This should be in the file." + EOL);
    },
    'log messages should be in the basic layout format': function(err, fileContents) {
      assert.match(
        fileContents, 
          /\[\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}\.\d{3}\] \[INFO\] default-settings - /
      );
    }
  },
  'with a max file size and no backups': {
    topic: function() {
      var testFile = path.join(__dirname, '/fa-maxFileSize-sync-test.log')
      , logger = log4js.getLogger('max-file-size')
      , that = this;
      remove(testFile);
      remove(testFile + '.1');
      //log file of 100 bytes maximum, no backups
      log4js.clearAppenders();
      log4js.addAppender(
        require('../lib/appenders/fileSync').appender(testFile, log4js.layouts.basicLayout, 100, 0), 
        'max-file-size'
      );
      logger.info("This is the first log message.");
      logger.info("This is an intermediate log message.");
      logger.info("This is the second log message.");

      fs.readFile(testFile, "utf8", that.callback);
    },
    'log file should only contain the second message': function (err, fileContents) {
      assert.include(fileContents, "This is the second log message." + EOL);
      assert.equal(fileContents.indexOf("This is the first log message."), -1);
    },
    'the number of files': {
      topic: function() {
        fs.readdir(__dirname, this.callback);
      },
      'starting with the test file name should be two': function(err, files) {
        //there will always be one backup if you've specified a max log size
        var logFiles = files.filter(
          function(file) { return file.indexOf('fa-maxFileSize-sync-test.log') > -1; }
        );
        assert.equal(logFiles.length, 2);
      }
    }
  },
  'with a max file size and 2 backups': {
    topic: function() {
      var testFile = path.join(__dirname, '/fa-maxFileSize-with-backups-sync-test.log')
      , logger = log4js.getLogger('max-file-size-backups');
      remove(testFile);
      remove(testFile+'.1');
      remove(testFile+'.2');
      
      //log file of 50 bytes maximum, 2 backups
      log4js.clearAppenders();
      log4js.addAppender(
        require('../lib/appenders/fileSync').appender(testFile, log4js.layouts.basicLayout, 50, 2), 
        'max-file-size-backups'
      );
      logger.info("This is the first log message.");
      logger.info("This is the second log message.");
      logger.info("This is the third log message.");
      logger.info("This is the fourth log message.");
      var that = this;
      
      fs.readdir(__dirname, function(err, files) { 
        if (files) { 
          that.callback(null, files.sort()); 
        } else { 
          that.callback(err, files); 
        }
      });
    },
    'the log files': {
      topic: function(files) {
        var logFiles = files.filter(
          function(file) { return file.indexOf('fa-maxFileSize-with-backups-sync-test.log') > -1; }
        );
        return logFiles;
      },
      'should be 3': function (files) {
        assert.equal(files.length, 3);
      },
      'should be named in sequence': function (files) {
        assert.deepEqual(files, [
          'fa-maxFileSize-with-backups-sync-test.log', 
          'fa-maxFileSize-with-backups-sync-test.log.1', 
          'fa-maxFileSize-with-backups-sync-test.log.2'
        ]);
      },
      'and the contents of the first file': {
        topic: function(logFiles) {
          fs.readFile(path.join(__dirname, logFiles[0]), "utf8", this.callback);
        },
        'should be the last log message': function(contents) {
          assert.include(contents, 'This is the fourth log message.');
        }
      },
      'and the contents of the second file': {
        topic: function(logFiles) {
          fs.readFile(path.join(__dirname, logFiles[1]), "utf8", this.callback);
        },
        'should be the third log message': function(contents) {
          assert.include(contents, 'This is the third log message.');
        }
      },
      'and the contents of the third file': {
        topic: function(logFiles) {
          fs.readFile(path.join(__dirname, logFiles[2]), "utf8", this.callback);
        },
        'should be the second log message': function(contents) {
          assert.include(contents, 'This is the second log message.');
        }
      }
    }
  }
}).addBatch({
  'configure' : {
    'with fileSyncAppender': {
      topic: function() {
        var log4js = require('../lib/log4js')
        , logger;
        //this config defines one file appender (to ./tmp-sync-tests.log)
        //and sets the log level for "tests" to WARN
        log4js.configure({
            appenders: [{ 
                category: "tests", 
                type: "file", 
                filename: "tmp-sync-tests.log", 
                layout: { type: "messagePassThrough" } 
            }],
  
            levels: { tests:  "WARN" }
        });
        logger = log4js.getLogger('tests');
        logger.info('this should not be written to the file');
        logger.warn('this should be written to the file');
        
        fs.readFile('tmp-sync-tests.log', 'utf8', this.callback);
      },
      'should load appender configuration from a json file': function(err, contents) {
        assert.include(contents, 'this should be written to the file' + EOL);
        assert.equal(contents.indexOf('this should not be written to the file'), -1);
      }
    }
  }
}).export(module);