var oboe = require('oboe')
var _ = require('lodash')
var Promise = require('bluebird')

module.exports = function DeviceServiceFactory($rootScope, $http, socket) {
  var deviceService = {
    devices: [],
    devicesBySerial: {}
  }

  function get(data) {
    return deviceService.devices[deviceService.devicesBySerial[data.serial]]
  }

  function insert(data, alter) {
    deviceService.devicesBySerial[data.serial] =
      deviceService.devices.push(data) - 1
    _.assign(data, alter)
    $rootScope.$digest()
  }

  function modify(data, properties) {
    if (data) {
      _.assign(data, properties)
      $rootScope.$digest()
    }
  }

  function remove(data) {
    var index = deviceService.devicesBySerial[data.serial]
    if (index >= 0) {
      deviceService.devices.splice(index, 1)
      delete deviceService.devicesBySerial[data.serial]
      $rootScope.$digest()
    }
  }

  socket.on('device.present', function (data) {
    remove(data)
    insert(data, {
      present: true
    })
  })

  socket.on('device.status', function (data) {
    modify(get(data), data)
  })

  socket.on('device.absent', function (data) {
    remove(data)
  })

  socket.on('device.identity', function (data) {
    modify(get(data), data)
  })

  socket.on('group.join', function (data) {
    modify(get(data), data)
  })

  socket.on('group.leave', function (data) {
    modify(get(data), {
      owner: null
    })
  })

  oboe('/api/v1/devices')
    .node('devices[*]', function (device) {
      // We want to skip other arguments
      insert(device)
    })

  deviceService.list = function () {
    return $http.get('/api/v1/devices')
      .then(function(response) {
        return response.data.devices
      })
  }

  deviceService.get = function (serial) {
    return $http.get('/api/v1/devices/' + serial)
      .then(function (response) {
        return response.data.device
      })
  }

  return deviceService
}