service

require 'sinatra'
require 'json'


TEST_SECRET_KEY = "railssuks"



def get_cities_names()
    Dir.entries('./SCHEDULES').select { |f| f != '.' && f != '..'}
end


def get_schedule_names_of_city(city_name)
    filenames = Dir.entries('./SCHEDULES/' + city_name).select { |f| f != '.' && f != '..'}

    filenames.map { |filename| File.basename(filename, File.extname(filename)) }
end

def get_schedules_metadata()
    city_folders = get_cities_names()
    cities = []
    city_folders.each do | city_name |
        schedules_names = get_schedule_names_of_city(city_name)
        if schedules_names.length != 0
            most_recent = schedules_names.map{ |e| e.to_i }.max
            city_hash = {:cityName => city_name,
                         :mostRecent => most_recent.to_s,
                         :schedules => schedules_names}
            cities.push(city_hash)
        end
    end
    cities.to_json
end

def get_json_string(city, schedule_version)
    json = File.read("./SCHEDULES/#{city}/#{schedule_version}.json")
    json
end


class MainService < Sinatra::Base

    set :bind, '0.0.0.0'
    set :port, '40000'
    set :environment, :production

    get '/' do
        get_schedules_metadata()
    end

    get '/:city/:schedule_version' do
        city = params['city']
        schedule_version  = params['schedule_version']

        cities = get_cities_names()
        if not cities.include? city
            error_json = {}
            error_json[:message] = 'wrong city'
            error_json[:city] = city
            return error_json.to_json
        end
        schedules = get_schedule_names_of_city(city)

        if not schedules.include? schedule_version
            error_json = {}
            error_json[:message] = 'wrong schedule version'
            error_json[:scheduleVersion] = schedule_version
            return error_json.to_json
        end

        get_json_string(city, schedule_version)
    end


end