class Controller

# File lib/gobart/controller.rb, line 130
def check_if_done #checks if the user is done with this session and checks for valid responses
  input_validator = false
  info_request = false
  while input_validator == false && info_request == false
    puts "\nCheck another station? [\'y\'/\'n\' or \'i\' for above station information]"

    check = gets.strip.downcase
    if check == 'y' || check == 'n'
      input_validator = true
    elsif check == 'i'
      puts "\n#{station_instance.info}"
      done = false
    else
      puts "\nALERT! Invalid response --> type \'y\'/\'n\' or \'i\'"
    end
  end

  if check == 'y'
    done = false
  else
    done = true
  end
  done
end

# File lib/gobart/controller.rb, line 109
def converter(status_data) #converts the status data into a more user friendly, easier to read format
  status_data.each do |x|
    puts ">>Destination: #{x[:destination]} (#{x[:abbreviation]})" #displays destination info

    combined_array = x[:arrivals].zip(x[:cars]) #combines the arrivals and cars arrays so they can be displayed together below
    combined_array.each do |x|
      puts "#{x[0]} min (#{x[1]} cars)" #displays the arrivals and cars information
    end
  end
end

# File lib/gobart/controller.rb, line 120
def display_results(station) #displays real time station data returned from the station instance
  puts "\n#{station.upcase} departures as of #{Time.now}\n"
  converter(station_instance.status)
  puts "\n*** Station Advisory ***\n"
  puts station_instance.advisories
  puts "\nThere are #{Scraper.scrape_train_count} trains running systemwide at this time.\n"
  puts ""
  puts "Data provided by BART.gov. Real time train departure data available at https://www.bart.gov/schedules/eta."
end

# File lib/gobart/controller.rb, line 57
def display_stations #displays stations and codes upon request by user
  STATIONS.each do |info|
    puts "#{info[:station]} (#{info[:code]})"
  end
end

# File lib/gobart/controller.rb, line 69
def get_input #returns valid BART station code; for complete list, go to http://api.bart.gov/docs/overview/abbrev.aspx
  if !Station.all.empty?
    print "\n(Recent searches: #{Station.all.collect {|x| x.name}})\n"
  end

  valid_station = false #sets the flag for the loop below

  while valid_station == false #checks to make sure the user is entering a valid station
    puts "\nEnter departure station code (e.g. \'woak\' for West Oakland) for real time departure information (type 'list' for codes):"
    station = gets.strip.downcase
    if station == "list"
      display_stations
    elsif STATIONS.detect {|x| x[:code] == station} #validates response using chart above
      valid_station = true
    else
      puts "\n ALERT! Invalid station code -> try again"
    end
  end
  station #returns the station value
end

# File lib/gobart/controller.rb, line 157
def goodbye #prints search history for the session and leaves user with pleasant wishes

  if !Station.all.empty?
    print "\n(Search history for this session: #{Station.all.collect {|x| x.name}})\n"
  end

  puts "\nHave a safe and pleasant journey!\n"
end

# File lib/gobart/controller.rb, line 90
def handle_request #controls the fulfillment of the query; because the fulfillment process is complex, this method was written to simplify and better manage the calls to the various processes.
  done = false
  while done == false
    station = get_input
    process_request(station)
    display_results(station)
    done = check_if_done
  end
end

# File lib/gobart/controller.rb, line 100
def process_request(station) #determines if the station request already has an instance; if it does, it does not create another one. regardless of the outcome, a call is made to the station class to get updates from the BART api
  if !Station.all.detect {|x| x.instance_variable_get("@name") == station}
    @station_instance = Station.new(station) #creates a new station instance if it does not already exist in the Station.all
  else
    @station_instance = Station.all.detect {|x| x.instance_variable_get("@name") == station}
  end
    station_instance.call(station)
end

# File lib/gobart/controller.rb, line 168
def run #entry point into the controller from the bin file
  welcome
  handle_request
  goodbye
end

# File lib/gobart/controller.rb, line 64
def welcome #provides a nice welcome message with the current time.
  puts "\nReal Time BART.gov Train Departures"
  puts "\nCurrent time is #{Time.now}"
end