#!/usr/bin/env ruby

$:.unshift File.join(File.dirname(__FILE__), *%w[.. lib])

require 'yaml'

help = <<HELP
Dropcaster is a podcast feed generator for the command line.

Author: Nicolas E. Rabenau nerab@gmx.at
Homepage: http://rubydoc.info/gems/dropcaster/file/README.md

Basic Usage:

  dropcaster            Prints a podcast feed document for the mp3 files in the current directory.
  dropcaster [FILE]...  Prints a podcast feed document for FILES
  dropcaster [DIR]...   Prints a podcast feed document for the mp3 files in DIR

Options:
HELP

def usage
  "Run '#{File.basename(__FILE__)} --help' for further help."
end

require 'optparse'
require 'dropcaster'

options = Hash.new
options[:auto_detect_channel_file] = true

opts = OptionParser.new do |opts|
  opts.banner = help

  opts.on("--verbose", "Verbose mode - displays additional diagnostic information") do |file|
    Dropcaster.logger = Logger.new(STDERR)
    Dropcaster.logger.formatter = Dropcaster::LogFormatter.new
    Dropcaster.logger.level = Logger::INFO
  end

  opts.on("--trace", "Verbose mode - displays additional diagnostic information") do |file|
    Dropcaster.logger = Logger.new(STDERR)
    Dropcaster.logger.formatter = Dropcaster::LogFormatter.new
    Dropcaster.logger.level = Logger::DEBUG
  end

  opts.on("--channel FILE", "Read the channel definition from FILE instead of channel.yml in the current directory.") do |file|
    begin
      Dropcaster.logger.info "Reading channel definition from #{file}"
      options = YAML.load_file(file).merge(options)
      options[:auto_detect_channel_file] = false
    rescue
      Dropcaster.logger.error "Could not load channel definition. #{$!.message}"
      Dropcaster.logger.info $!.backtrace
      exit(1)
    end
  end

  opts.on("--title STRING", "Use STRING as the channel's title. Overrides settings read from channel definition file.") do |title|
    Dropcaster.logger.info "Setting channel title to '#{title}' via command line"
    options[:title] = title
  end

  opts.on("--subtitle STRING", "Use STRING as the channel's subtitle. Overrides settings read from channel definition file.") do |subtitle|
    Dropcaster.logger.info "Setting channel subtitle to '#{subtitle}' via command line"
    options[:subtitle] = subtitle
  end

  opts.on("--url URL", "Use URL as the channel's url. Overrides settings read from channel definition file.") do |url|
    Dropcaster.logger.info "Setting channel URL to '#{url}' via command line"
    options[:url] = url
  end

  opts.on("--description STRING", "Use STRING as the channel's description. Overrides settings read from channel definition file.") do |description|
    Dropcaster.logger.info "Setting channel description to '#{description}' via command line"
    options[:description] = description
  end

  opts.on("--enclosures URL", "Use URL as the base URL for the channel's enclosures. Overrides settings read from channel definition file.") do |enclosures_url|
    Dropcaster.logger.info "Setting enclosures base URL to '#{enclosures_url}' via command line"
    options[:enclosures_url] = enclosures_url
  end

  opts.on("--image URL", "Use URL as the channel's image URL. Overrides settings read from channel definition file.") do |image_url|
    Dropcaster.logger.info "Setting image URL to '#{image_url}' via command line"
    options[:image_url] = image_url
  end

  opts.on("--channel-template FILE", "Use FILE as template for generating the channel feed. Overrides the default that comes with Dropcaster.") do |file|
    Dropcaster.logger.info "Using'#{file}' as channel template file"
    options[:channel_template] = file
  end

  opts.on("--version", "Display current version") do
    puts "#{File.basename(__FILE__)} " + Dropcaster::VERSION
    exit 0
  end
end

opts.parse!
sources = ARGV.blank? ? '.' : ARGV

if options[:auto_detect_channel_file]
  # There was no channel file specified, so we try to load channel.yml from sources dir
  channel_file = Dropcaster::ChannelFileLocator.locate(sources)

  if File.exists?(channel_file)
    Dropcaster.logger.info "Auto-detected channel file at #{channel_file}"
    options_from_yaml = YAML.load_file(channel_file)
    options = options_from_yaml.merge(options)
  else
    Dropcaster.logger.error "No channel file found at #{channel_file})"
    Dropcaster.logger.info usage
    exit(1) # No way to continue without a channel definition
  end
end

Dropcaster.logger.info "Generating the channel with these options: #{options.inspect}"

begin
  puts Dropcaster::Channel.new(sources, options).to_rss
rescue
  Dropcaster.logger.error $!.message
  $!.backtrace.each do |line|
    Dropcaster.logger.debug(line)
  end
  Dropcaster.logger.info usage
  exit(1)
end