#!/usr/bin/env ruby
################################################################################
##  File:  configure-xcode-simulators.rb
##  Desc:  List all simulators, find duplicate type and delete them.
##  Maintainer: @vlas-voloshin
##              script was taken from https://gist.github.com/vlas-voloshin/f9982128200345cd3fb7
################################################################################

class SimDevice

    attr_accessor :runtime
    attr_accessor :name
    attr_accessor :identifier
    attr_accessor :timestamp

    def initialize(runtime, name, identifier, timestamp)
      @runtime = runtime
      @name = name
      @identifier = identifier
      @timestamp = timestamp
    end

    def to_s
      return "#{@name} - #{@runtime} (#{@identifier}) [#{@timestamp}]"
    end

    def equivalent_to_device(device)
      return @runtime == device.runtime && @name == device.name
    end

  end

  # Executes a shell command and returns the result from stdout
  def execute_simctl_command(command)
    return %x[xcrun simctl #{command}]
  end

  # Retrieves the creation date/time of simulator with specified identifier
  def simulator_creation_date(identifier)
    directory = Dir.home() + "/Library/Developer/CoreSimulator/Devices/" + identifier
    if (Dir.exists?(directory))
      if (File::Stat.method_defined?(:birthtime))
        return File.stat(directory).birthtime
      else
        return File.stat(directory).ctime
      end
    else
      # Simulator directory is not yet created - treat it as if it was created right now (happens with new iOS 9 sims)
      return Time.now
    end
  end

  # Deletes specified simulator
  def delete_device(device)
    execute_simctl_command("delete #{device.identifier}")
  end

  puts("Searching for simulators...")

  # Retrieve the list of existing simulators
  devices = []
  runtime = ""
  execute_simctl_command("list devices").lines.each do |line|
    case line[0]
    when '='
      # First header, skip it
    when '-'
      # Runtime header
      runtime = line.scan(/-- (.+?) --/).flatten[0]
    else
      name_and_identifier = line.scan(/\s+(.+?) \(([\w\d]+-[\w\d]+-[\w\d-]+)\)/)[0]
      name = name_and_identifier[0]
      identifier = name_and_identifier[1]
      timestamp = simulator_creation_date(identifier)
      device = SimDevice.new(runtime, name, identifier, timestamp)
      devices.push(device)
    end
  end

  # Sort the simulators by their creation timestamp, ascending
  devices = devices.sort { |a, b| a.timestamp <=> b.timestamp }

  duplicates = {}
  # Enumerate all devices except for the last one
  for i in 0..devices.count-2
    device = devices[i]
    # Enumerate all devices *after* this one (created *later*)
    for j in i+1..devices.count-1
      potential_duplicate = devices[j]
      if potential_duplicate.equivalent_to_device(device)
        duplicates[potential_duplicate] = device
        # Break out of the inner loop if a duplicate is found - if another duplicate exists,
        # it will be found when this one is reached in the outer loop
        break
      end
    end
  end

  if duplicates.count == 0
    puts("You don't have duplicate simulators!")
    exit()
  end

  puts("Looks like you have #{duplicates.count} duplicate simulator#{duplicates.count > 1 ? "s" : ""}:")
  duplicates.each_pair do |duplicate, original|
    puts
    puts("#{duplicate}")
    puts("--- duplicate of ---")
    puts("#{original}")
  end
  puts

  puts("Each duplicate was determined as the one created later than the 'original'.")

  puts("Deleting...")
  duplicates.each_key do |duplicate|
    delete_device(duplicate)
  end

  puts("Done!")

=begin
MIT License

Copyright (c) 2015-2019 Vlas Voloshin

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
=end