class ActiveFedora::FileConfigurator

def build_predicate_config_path
  testfile = ::File.expand_path(get_config_path(:predicate_mappings))
  if ::File.exist?(testfile) && valid_predicate_mapping?(testfile)
    return testfile
  end
  raise PredicateMappingsNotFoundError
end

def check_fedora_path_for_solr
  path = ::File.dirname(self.path) + "/solr.yml"
  if ::File.file? path
    return path
  else
    return nil
  end
end

def config_loaded?
  @config_loaded || false
end

def fedora_config
  load_configs
  @fedora_config
end

def get_config_path(config_type)
  config_type = config_type.to_s
  if (config_path = config_options.fetch("#{config_type}_config_path".to_sym,nil) )
    raise ConfigurationError, "file does not exist #{config_path}" unless ::File.file? config_path
    return ::File.expand_path(config_path)
  end
  # if solr, attempt to use path where fedora.yml is first
  if config_type == "solr" && (config_path = check_fedora_path_for_solr)
    return config_path
  end
  if defined?(Rails.root)
    config_path = "#{Rails.root}/config/#{config_type}.yml"
    return config_path if ::File.file? config_path
  end
  if ::File.file? "#{Dir.getwd}/config/#{config_type}.yml"
    return "#{Dir.getwd}/config/#{config_type}.yml"
  end
  # Last choice, check for the default config file
  config_path = ::File.join(ActiveFedora.root, "config", "#{config_type}.yml")
  if ::File.file? config_path
    ActiveFedora::Base.logger.warn "Using the default #{config_type}.yml that comes with active-fedora.  If you want to override this, pass the path to #{config_type}.yml to ActiveFedora - ie. ActiveFedora.init(:#{config_type}_config_path => '/path/to/#{config_type}.yml') - or set Rails.root and put #{config_type}.yml into \#{Rails.root}/config." if ActiveFedora::Base.logger
    return config_path
  else
    raise ConfigurationError, "Couldn't load #{config_type} config file!"
  end
end

def get_solr_url(solr_config)
  if @index_full_text == true && solr_config.has_key?(:fulltext) && solr_config[:fulltext].has_key?('url')
    return solr_config[:fulltext]['url']
  elsif solr_config.has_key?(:default) && solr_config[:default].has_key?('url')
    return solr_config[:default]['url']
  elsif solr_config.has_key?('url')
    return solr_config['url']
  elsif solr_config.has_key?(:url)
    return solr_config[:url]
  else
    raise URI::InvalidURIError
  end
end

def init options = {}
  if options.is_a?(String)
    raise ArgumentError, "Calling ActiveFedora.init with a path as an argument has been removed.  Use ActiveFedora.init(:fedora_config_path=>#{options})"
  end
  reset!
  @config_options = options
  load_configs
end

def initialize
  reset!
end

def load_configs
  return if config_loaded?
  @config_env = ActiveFedora.environment
  load_fedora_config
  load_solr_config
  @config_loaded = true
end

def load_fedora_config
  return @fedora_config unless @fedora_config.empty?
  @fedora_config_path = get_config_path(:fedora)
  ActiveFedora::Base.logger.info("ActiveFedora: loading fedora config from #{::File.expand_path(@fedora_config_path)}") if ActiveFedora::Base.logger
  begin
    config_erb = ERB.new(IO.read(@fedora_config_path)).result(binding)
  rescue Exception => e
    raise("fedora.yml was found, but could not be parsed with ERB. \n#{$!.inspect}")
  end
  begin
    fedora_yml = YAML.load(config_erb)
  rescue Psych::SyntaxError => e
    raise "fedora.yml was found, but could not be parsed. " \
          "Error #{e.message}"
  end
  config = fedora_yml.symbolize_keys
  cfg = config[ActiveFedora.environment.to_sym] || {}
  @fedora_config = cfg.kind_of?(Array) ? cfg.map(&:symbolize_keys) : cfg.symbolize_keys
end

def load_solr_config
  return @solr_config unless @solr_config.empty?
  @solr_config_path = get_config_path(:solr)
  ActiveFedora::Base.logger.info "ActiveFedora: loading solr config from #{::File.expand_path(@solr_config_path)}" if ActiveFedora::Base.logger
  begin
    config_erb = ERB.new(IO.read(@solr_config_path)).result(binding)
  rescue Exception => e
    raise("solr.yml was found, but could not be parsed with ERB. \n#{$!.inspect}")
  end
  begin
    solr_yml = YAML.load(config_erb)
  rescue StandardError => e
    raise("solr.yml was found, but could not be parsed.\n")
  end
  config = solr_yml.symbolize_keys
  raise "The #{ActiveFedora.environment.to_sym} environment settings were not found in the solr.yml config.  If you already have a solr.yml file defined, make sure it defines settings for the #{ActiveFedora.environment.to_sym} environment" unless config[ActiveFedora.environment.to_sym]
  @solr_config = {:url=> get_solr_url(config[ActiveFedora.environment.to_sym].symbolize_keys)}
end

def path
  get_config_path(:fedora)
end

def predicate_config
  @predicate_config_path ||= build_predicate_config_path
  YAML.load(::File.open(@predicate_config_path)) if ::File.exist?(@predicate_config_path)
end

def reset!
  @config_loaded = false  #Force reload of configs
  @fedora_config = {}
  @solr_config = {}
  @config_options = {}
  @predicate_config_path = nil
end

def solr_config
  load_configs
  @solr_config
end

def valid_predicate_mapping?(testfile)
  mapping = YAML.load(::File.open(testfile))
  return false unless mapping.has_key?(:default_namespace) && mapping[:default_namespace].is_a?(String)
  return false unless mapping.has_key?(:predicate_mapping) && mapping[:predicate_mapping].is_a?(Hash)
  true
end