#!/usr/bin/env ruby
# frozen_string_literal: true

$LOAD_PATH.unshift File.join(File.dirname(__FILE__), '..', 'lib')

require 'yaml'
require 'English'

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

  Author: Nicolas E. Rabenau nerab@gmx.at
  Homepage: http://nerab.github.io/dropcaster/

  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'
require 'dropcaster/log_formatter'

options = {}
options[:auto_detect_channel_file] = true

logger = Logger.new($stderr).tap do |l|
  l.level = Logger::WARN
  l.formatter = Dropcaster::LogFormatter.new
end

# rubocop:disable Metrics/BlockLength
OptionParser.new do |opts|
  opts.banner = help

  opts.on('--verbose', 'Verbose mode - displays additional diagnostic information') do
    logger.level = Logger::INFO
  end

  opts.on('--trace', 'Verbose mode - displays additional diagnostic information') do
    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|
    logger.info "Reading channel definition from #{file}"
    begin
      options = YAML.load_file(file).merge(options)
      options[:auto_detect_channel_file] = false
    rescue StandardError
      logger.error "Could not load channel definition. #{$ERROR_INFO.message}"
      logger.info $ERROR_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|
    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|
    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|
    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|
    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|
    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|
    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|
    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.parse!
# rubocop:enable Metrics/BlockLength

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

logger.info "Generating the channel with these options: #{options.inspect}"
begin
  puts Dropcaster::Channel.new(sources, options).to_rss
rescue StandardError
  logger.error $ERROR_INFO.message
  $ERROR_INFO.backtrace.each do |line|
    logger.debug(line)
  end
  logger.info usage
  exit(1)
end