# encoding: utf-8

module Slideshow

class Config

  include LogUtils::Logging

  def initialize( opts )
    @opts   = opts
  end

  ## -- todo: allow (direct) access to opts - why? why not? 
  ## attr_reader :opts

  def manifest()        @opts.manifest;       end
  def quick_manifest()  @opts.quick_manifest; end
  def header_level()    @opts.header_level;   end
  def slide?()          @opts.slide?;         end
  def takahashi?()      @opts.takahashi?;     end
  def test?()           @opts.test?;          end    ## in test mode (yes/no) - will (auto-)include test templates
  def verbose?()        @opts.verbose?;       end
  def output_path()     @opts.output_path;    end


  # todo/fix: fix references after this move to here, that is, Config class
  # - used in syntax/uv_helper (use config.cache_dir to access?)
  
  def cache_dir
    File.join( Env.home, '.slideshow' )
  end

  def config_dir
    unless @config_dir  # first time? calculate config_dir value to "cache"
      @config_dir = @opts.config_path
    
      # make sure path exists
      FileUtils.makedirs( @config_dir ) unless File.directory? @config_dir
    end
    
    @config_dir
  end


  def shortcut_index_file
    ## e.g. ~/slideshow.index.yml
    File.join( Env.home, 'slideshow.index.yml' )
  end


  def load_shortcuts
    # load default index/registry for shortcuts
    props_shortcuts_default_file = File.join( Slideshow.root, 'config', 'slideshow.index.yml' )
    @props_shortcuts = @props_shortcuts_default = Props.load_file( props_shortcuts_default_file )

    # check for update (slideshow.index.yml) in home folder

    props_shortcuts_home_file = File.join( Env.home, 'slideshow.index.yml' )
    if File.exists?( props_shortcuts_home_file )
      puts "Loading shortcut index from '#{props_shortcuts_home_file}'..."
      @props_shortcuts = @props_shortcuts_home = Props.load_file( props_shortcuts_home_file, @props_shortcuts )
    end
    
    # todo: add props from (optional) fetch section from 'standard' props (e.g. props[:fetch])
    #  - allows user to add own shortcuts in slideshow.yml settings
  end


  def map_fetch_shortcut( key )
    # NB: always returns an array!!!  0,1 or more entries
    # - no value - return empty ary
    
    ## todo: normalize key???
    value = @props.fetch_from_section( 'fetch', key, @props_shortcuts.fetch( key, nil ))

    if value.nil?
      []
    elsif value.kind_of?( String )
      [value]
    else  # assume it's an array already;  ## todo: check if it's an array
      value
    end
  end


  def default_fetch_shortcuts
    ## NB: used by install --all

    ['s6blank',
     's6syntax',
     's5blank',
     's5themes',
     'g5',
     'slidy',
     'deck.js',
     'impress.js',
     'analytics'
    ]
    
    ## todo: use @props_shortcuts keys
    #  and use
    #
    # fetch_shortcuts = fetch_shortcuts.clone
    # fetch_shortcuts.delete( 'fullerscreen' )  # obsolete (do not promote any longer)
    # fetch_shortcuts.delete( 'slippy' )  # needs update/maintainer anyone?
    # fetch_shortcuts.delete( 'shower' )  # needs update/maintainer anyone?
    # etc. to strip keys for all install
  end


  def load
    
    # load builtin config file @  <gem>/config/slideshow.yml
    #
    # NB: builtin use a different hierachy (not linked to default/home/user/cli props)
    #     for now builtin has no erb processing
    #     user cannot override builtin settings (only defaults see below)
    props_builtin_file  = File.join( Slideshow.root, 'config', 'slideshow.builtin.yml' )
    @props_builtin = Props.load_file( props_builtin_file )

    props_default_file  = File.join( Slideshow.root, 'config', 'slideshow.yml' )
    @props = @props_default = Props.load_file_with_erb( props_default_file, binding() )

    # check for user settings (slideshow.yml) in home folder
    
    props_home_file = File.join( Env.home, 'slideshow.yml' )
    if File.exists?( props_home_file )
      puts "Loading settings from '#{props_home_file}'..."
      @props = @props_home = Props.load_file_with_erb( props_home_file, binding(), @props )
    end
      
    # check for user settings (slideshow.yml) in working folder
    
    props_work_file = File.join( '.', 'slideshow.yml' )
    if File.exists?( props_work_file )
      puts "Loading settings from '#{props_work_file}'..."
      @props = @props_work = Props.load_file_with_erb( props_work_file, binding(), @props )
    end
    
    # load shortcuts
    load_shortcuts
  end

  def dump  # dump settings for debugging
    puts "Slideshow settings:"
    @props_builtin.dump  if @props_builtin
    @props_default.dump  if @props_default
    @props_home.dump     if @props_home
    @props_work.dump     if @props_work
    
    puts "Slideshow shortcuts:"
    @props_shortcuts_default.dump  if @props_shortcuts_default
    @props_shortcuts_home.dump     if @props_shortcuts_home
    ## todo: add props from 'standard' props via fetch key
    
    ## todo: add more config settings?
  end


  def header( key )
    @props.fetch_from_section( 'headers', normalize_key( key ), nil )
  end

  
  def text_filters
    @props.fetch( 'filters', [] )
  end
  
  def google_analytics_code
    @props.fetch_from_section( 'analytics', 'google', nil )
  end

  def helper_renames
    ## NB: for now user cannot override/extent renames
    @props_builtin['helper']['renames']
  end

  def helper_unparsed
    ## NB: for now user cannot override/extent unparsed helpers
    # use unparsed params (passed along a single string)
    @props_builtin['helper']['unparsed']
  end
  
  def helper_exprs
    ## NB: for now user cannot override/extent helper exprs
    # allow expression as directives (no need for %end block)
    # by default directives are assumed statements (e.g. %mydir  %end)
    @props_builtin['helper']['exprs']
  end

private

  def normalize_key( key )
    #  make key all lower case/downcase (e.g. Content-Type  => content-type)
    #  replace _ with -                 (e.g. gradient_color => gradient-color)
    #  todo: replace space(s) with -  ??
    #  todo: strip leading and trailing spaces - possible use case ??
    
    key.to_s.downcase.tr( '_', '-' )
  end

end # class Config

end # module Slideshow