conveyal/modeify

var convert = require('../convert')
var hogan = require('hogan.js')
var transitive = require('../transitive')

var template = hogan.compile(require('./template.html'))

module.exports = function (route, opts) {
  opts = opts || {}

  var accessMode = route.access()[0].mode.toLowerCase()

  // style a park-and-ride access mode the same as a regular car trip
  if (accessMode === 'car_park') accessMode = 'car'

  var accessModeIcon = convert.modeToIcon(accessMode)
  var egress = route.egress()
  var segments = []
  var transitSegments = route.transit()

  if (transitSegments.length < 1 && accessMode === 'car') {
    accessModeIcon = convert.modeToIcon('carshare')
  }

  segments.push({
    mode: accessModeIcon,
    style: getModeStyles(accessMode),
    inline: !!opts.inline,
    small: !!opts.small,
    svg: true
  })

  segments = segments.concat(transitSegments.map(function (segment) {
    var patterns = segment.segmentPatterns.filter(patternFilter('color'))
    var background = patterns[0].color

    if (patterns.length > 0) {
      var percent = 0
      var increment = 1 / patterns.length * 100
      background = 'linear-gradient(to right'
      for (var i = 0; i < patterns.length; i++) {
        var color = patterns[i].color
        background += ',' + color + ' ' + percent + '%, ' + color + ' ' + (percent + increment) + '%'
        percent += increment
      }
      background += ')'
    }

    return {
      background: background,
      mode: convert.modeToIcon(segment.mode),
      inline: !!opts.inline,
      small: !!opts.small,
      shortName: patterns[0].shield,
      longName: patterns[0].longName || patterns[0].shield
    }
  }))

  if (egress && egress.length > 0) {
    var egressMode = egress[0].mode.toLowerCase()
    if (egressMode !== 'walk') {
      segments.push({
        mode: convert.modeToIcon(egressMode),
        style: getModeStyles(egressMode),
        inline: !!opts.inline,
        small: !!opts.small,
        svg: true
      })
    }
  }

  return segments
    .map(function (s) {
      return template.render(s)
    })
    .join('')
}

/**
 * Pattern filter
 */

function patternFilter (by) {
  by = by || 'shortName'
  var names = []
  return function (p) {
    if (by === 'shortName') {
      p.shortName = p.shortName || p.longName
    }

    if (names.indexOf(p[by]) === -1) {
      names.push(p[by])
      return true
    } else {
      return false
    }
  }
}

function getModeStyles (mode) {
  var styles = transitive.getModeStyles(mode.toUpperCase())
  var s = ''
  for (var i in styles) {
    s += i + ':' + styles[i] + ';'
  }
  return s
}