text: var util = require('util')
  var resolve = require('url').resolve
  var SourceMapConsumer = require('source-map').SourceMapConsumer
  var _ = require('lodash')
  
  var log = require('./logger').create('reporter')
  var MultiReporter = require('./reporters/multi')
  var baseReporterDecoratorFactory = require('./reporters/base').decoratorFactory
  
  var createErrorFormatter = function (config, emitter, SourceMapConsumer) {
    var basePath = config.basePath
    var urlRoot = config.urlRoot || ''
    var lastServedFiles = []
  
    emitter.on('file_list_modified', function (files) {
      lastServedFiles = files.served
    })
  
    var findFile = function (path) {
      for (var i = 0; i < lastServedFiles.length; i++) {
        if (lastServedFiles[i].path === path) {
          return lastServedFiles[i]
        }
      }
      return null
    }
  
    var URL_REGEXP = new RegExp('(?:https?:\\/\\/' +
      config.hostname + '(?:\\:' + config.port + ')?' + ')?\\/?' +
      urlRoot + '\\/?' +
      '(base/|absolute)' + // prefix, including slash for base/ to create relative paths.
      '((?:[A-z]\\:)?[^\\?\\s\\:]*)' + // path
      '(\\?\\w*)?' + // sha
      '(\\:(\\d+))?' + // line
      '(\\:(\\d+))?' + // column
      '', 'g')
  
    var getSourceMapConsumer = (function () {
      var cache = new WeakMap()
      return function (sourceMap) {
        if (!cache.has(sourceMap)) {
          cache.set(sourceMap, new SourceMapConsumer(sourceMap))
        }
        return cache.get(sourceMap)
      }
    }())
  
    return function (input, indentation) {
      indentation = _.isString(indentation) ? indentation : ''
      if (_.isError(input)) {
        input = input.message
      } else if (_.isEmpty(input)) {
        input = ''
      } else if (!_.isString(input)) {
        input = JSON.stringify(input, null, indentation)
      }
  
      // remove domain and timestamp from source files
      // and resolve base path / absolute path urls into absolute path
      var msg = input.replace(URL_REGEXP, function (_, prefix, path, __, ___, line, ____, column) {
        // Find the file using basePath + path, but use the more readable path down below.
        var file = findFile(prefix === 'base/' ? basePath + '/' + path : path)
  
        if (file && file.sourceMap && line) {
          line = parseInt(line || '0', 10)
  
          column = parseInt(column, 10)
  
          // When no column is given and we default to 0, it doesn't make sense to only search for smaller
          // or equal columns in the sourcemap, let's search for equal or greater columns.
          var bias = column ? SourceMapConsumer.GREATEST_LOWER_BOUND : SourceMapConsumer.LEAST_UPPER_BOUND
  
          try {
            var original = getSourceMapConsumer(file.sourceMap)
              .originalPositionFor({line: line, column: (column || 0), bias: bias})
  
            // Source maps often only have a local file name, resolve to turn into a full path if
            // the path is not absolute yet.
            var sourcePath = resolve(path, original.source)
            var formattedColumn = column ? util.format(':%s', column) : ''
            return util.format('%s:%d:%d <- %s:%d%s', sourcePath, original.line, original.column,
                path, line, formattedColumn)
          } catch (e) {
            log.warn('SourceMap position not found for trace: %s', msg)
            // Fall back to non-source-mapped formatting.
          }
        }
  
        var result = path + (line ? ':' + line : '') + (column ? ':' + column : '')
        return result || prefix
      })
  
      // indent every line
      if (indentation) {
        msg = indentation + msg.replace(/\n/g, '\n' + indentation)
      }
  
      // allow the user to format the error
      if (config.formatError) {
        return config.formatError(msg)
      }
  
      return msg + '\n'
    }
  }
  
  var createReporters = function (names, config, emitter, injector) {
    var errorFormatter = createErrorFormatter(config, emitter, SourceMapConsumer)
    var reporters = []
  
    // TODO(vojta): instantiate all reporters through DI
    names.forEach(function (name) {
      if (['dots', 'progress'].indexOf(name) !== -1) {
        var Cls = require('./reporters/' + name)
        var ClsColor = require('./reporters/' + name + '_color')
        reporters.push(new Cls(errorFormatter, config.reportSlowerThan, config.colors, config.browserConsoleLogOptions))
        return reporters.push(new ClsColor(errorFormatter, config.reportSlowerThan, config.colors, config.browserConsoleLogOptions))
      }
  
      var locals = {
        baseReporterDecorator: ['factory', baseReporterDecoratorFactory],
        formatError: ['value', errorFormatter]
      }
  
      try {
        log.debug('Trying to load reporter: %s', name)
        reporters.push(injector.createChild([locals], ['reporter:' + name]).get('reporter:' + name))
      } catch (e) {
        if (e.message.indexOf('No provider for "reporter:' + name + '"') !== -1) {
          log.error('Can not load reporter "%s", it is not registered!\n  ' +
            'Perhaps you are missing some plugin?', name)
        } else {
          log.error('Can not load "%s"!\n  ' + e.stack, name)
        }
        emitter.emit('load_error', 'reporter', name)
        return
      }
      var colorName = name + '_color'
      if (names.indexOf(colorName) !== -1) {
        return
      }
      try {
        log.debug('Trying to load color-version of reporter: %s (%s)', name, colorName)
        reporters.push(injector.createChild([locals], ['reporter:' + name + '_color']).get('reporter:' + name))
      } catch (e) {
        log.debug('Couldn\'t load color-version.')
      }
    })
  
    // bind all reporters
    reporters.forEach(function (reporter) {
      emitter.bind(reporter)
    })
  
    return new MultiReporter(reporters)
  }
  
  createReporters.$inject = [
    'config.reporters',
    'config',
    'emitter',
    'injector'
  ]
  
  // PUBLISH
  exports.createReporters = createReporters
  