class OSRMRouting

# File lib/osrm-routing.rb, line 11
def initialize(origin = {}, waypoints = [], debug = false)
  self.origin = origin
  self.waypoints = waypoints
  self.debug = debug
end

# File lib/osrm-routing.rb, line 17
def optimize
  response = {
    status: 200,
    errors: {},
    result: nil
  }

  if self.origin.class != Hash
    response[:status] = 400
    response[:errors][:origin] = 'Invalid format'
  end

  if self.origin.keys.length == 0
    if response[:status] == 200
      response[:status] = 400
    end

    response[:errors][:origin] = 'Required parameter'
  end

  points = [
    [
      origin[:longitude],
      origin[:latitude]
    ]
  ]

  if self.waypoints.class != Array
    if response[:status] == 200
      response[:status] = 400
    end

    response[:errors][:waypoints] = 'Invalid format'
  end

  if self.waypoints.length == 0
    if response[:status] == 200
      response[:status] = 400
    end

    response[:errors][:waypoints] = 'Required parameter'
  end

  self.waypoints.each do |waypoint|
    if waypoint.class != Hash
      if response[:status] == 200
        response[:status] = 400
      end

      response[:errors][:waypoints] = 'Invalid format'
    end

    if waypoint.keys.length == 0
      if response[:status] == 200
        response[:status] = 400
      end

      response[:errors][:waypoints] = 'Invalid format'
    end

    if response[:status] != 200
      break
    end

    points.push([
      waypoint[:longitude],
      waypoint[:latitude]
    ])
  end

  route = "https://router.project-osrm.org/trip/v1/driving/#{points.map{ |point| point.join(",")}.join(";")}?roundtrip=true"

  if self.debug
    puts "=============================== Debug control logger ==============================="
    puts "Query route: #{route}"
    puts "===================================================================================="
  end

  uri = URI.parse(route)
  osrm = Net::HTTP.get_response(uri)

  response[:status] = osrm.code.to_i

  if response[:status] != 200
    response[:errors][:request] = "HTTP Error"
    response[:result] = JSON.parse(osrm.body)
  else
    final_route = []

    osrm = JSON.parse(osrm.body, :symbolize_names => true)
    
    osrm[:waypoints].each do |waypoint|
      final_route.push(waypoint[:waypoint_index])
    end

    final_route.push(0)

    steps = []

    osrm[:trips][0][:legs].each.with_index do |leg, i|
      if i == (osrm[:trips][0][:legs].length - 1)
        steps.push({
          origin: final_route[i],
          destination: final_route[0],
          distance: leg[:distance],
          duration: leg[:duration]
        })
      else
        steps.push({
          origin: final_route[i],
          destination: final_route[i + 1],
          distance: leg[:distance],
          duration: leg[:duration]
        })
      end
    end


    response[:result] = {
      optimized_route: final_route,
      total_duration: osrm[:trips][0][:duration] / 60.0,
      total_distance: osrm[:trips][0][:distance] / 1000.0,
      steps: steps
    }
  end

  return response
end