module Conflux

# File lib/conflux.rb, line 23
def start!
  fetch_configs if configured_for_conflux
end

# File lib/conflux.rb, line 29
def configured_for_conflux
  if ENV[CONFLUX_USER] && ENV[CONFLUX_APP]
    @creds_preset = true

    @credentials = {
      'CONFLUX_USER' => ENV[CONFLUX_USER],
      'CONFLUX_APP' => ENV[CONFLUX_APP]
    }
  else
    @credentials = File.exists?(MANIFEST_PATH) ? manifest_creds : {}
  end

  @credentials[CONFLUX_USER] && @credentials[CONFLUX_APP]
end

# File lib/conflux.rb, line 113
def conflux_url
  ENV['CONFLUX_HOST'] || 'https://api.goconflux.com'
end

# File lib/conflux.rb, line 54
def fetch_configs
  configs = Conflux::Helpers.form_request(Net::HTTP::Get, '/keys', {}, headers, 'Error fetching Conflux configs')
  set_configs(configs, !@creds_preset)
end

# File lib/conflux.rb, line 106
def headers
  {
    'Conflux-User' => @credentials[CONFLUX_USER],
    'Conflux-App' => @credentials[CONFLUX_APP]
  }
end

# File lib/conflux.rb, line 102
def key_already_set?(key)
  ENV.key?(key) || @app_configs.key?(key) || (@app_configs[Rails.env] || {}).key?(key)
end

# File lib/conflux.rb, line 44
def manifest_creds
  manifest = JSON.parse(File.read(MANIFEST_PATH)) rescue {}
  configs = manifest['configs'] || {}

  {
    'CONFLUX_USER' => configs[CONFLUX_USER],
    'CONFLUX_APP' => configs[CONFLUX_APP]
  }
end

# File lib/conflux.rb, line 59
def set_configs(configs_map, add_to_yml)
  # Get application.yml file to make sure config vars aren't already there
  @app_configs = (YAML::load_file(APPLICATION_YAML_PATH) || {}) rescue {}

  if add_to_yml
    File.open(CONFLUX_YAML_PATH, 'w+') do |f|
      f.write(yaml_header)

      configs_map.each { |addon_name, configs|
        f.write("\n\n# #{addon_name}") if !configs.empty?

        configs.each { |config|
          key = config['name']
          value = config['value']
          description = config['description']

          # if the key already exists, let the developer know that it has
          # been overwritten and to what value
          if key_already_set?(key)
            description = description.nil? ? '' : " ... #{description}"
            line = "\n# #{key}  <-- (Overwritten) #{description}"
          else
            description = description.nil? ? '' : " # #{description}"
            line = "\n#{key}#{description}"
            ENV[key] = value
          end

          f.write(line)
        }
      }
    end
  else
    configs_map.each { |addon_name, configs|
      configs.each { |config|
        key = config['name']
        value = config['value']

        ENV[key] = value if !key_already_set?(key)
      }
    }
  end
end

# File lib/conflux.rb, line 117
def yaml_header
  "\n# CONFLUX CONFIG VARS:\n\n" \
  "# All config vars seen here are in use and pulled from Conflux.\n" \
  "# If any are ever overwritten, they will be marked with \"Overwritten\"\n" \
  "# If you ever wish to overwrite any of these, do so inside of a config/application.yml file."
end