# -*- encoding: utf-8 -*-
require 'lolcommits/platform'
require 'methadone'

module Lolcommits
  module CLI
    # Helper methods for failing on error conditions in the lolcommits CLI.
    module Fatals
      include Lolcommits

      # Check for platform related conditions that could prevent lolcommits from
      # working properly.
      #
      # Die with an informative error message if any occur.
      def self.die_on_fatal_platform_conditions!
        # make sure the capture binaries are in a good state
        if Platform.platform_mac?
          %w(imagesnap videosnap).each do |executable|
            next if File.executable? File.join(Configuration::LOLCOMMITS_ROOT, 'vendor', 'ext', executable, executable)
            fatal "Couldn't properly execute #{executable} for some reason, "\
                  'please file a bug?!'
            exit 1
          end
        elsif Platform.platform_linux?
          unless Platform.command_which('mplayer')
            fatal "Couldn't find mplayer in your PATH!"
            exit 1
          end
        end

        # make sure we can find the default font
        unless File.readable? Lolcommits::Loltext::DEFAULT_FONT_PATH
          fatal "Couldn't properly read Impact font from gem package, "\
                'please file a bug?!'
          exit 1
        end

        # make sure imagemagick is around and good to go
        unless Platform.valid_imagemagick_installed?
          fatal 'FATAL: ImageMagick does not appear to be properly installed!'\
                '(or version is too old)'
          exit 1
        end

        # check for a error condition with git config affecting ruby-git
        return unless Platform.git_config_color_always?
        fatal 'Due to a bug in the ruby-git library, git config for color.ui'\
          " cannot be set to 'always'."
        fatal "Try setting it to 'auto' instead!"
        exit 1
      end

      # Die with an informative error message if ffmpeg is not installed.
      # This is only used for certain functions (such as animation), so only run
      # this when you know the user wants to perform one of them.
      def self.die_if_no_valid_ffmpeg_installed!
        return if Platform.valid_ffmpeg_installed?
        fatal 'FATAL: ffmpeg does not appear to be properly installed!'
        exit 1
      end

      # If we are not in a git repo, we can't do git related things!
      # Die with an informative error message in that case.
      def self.die_if_not_vcs_repo!
        debug 'Checking for valid vcs repo'
        current = File.expand_path('.')
        parent = File.dirname(current)
        while current != parent
          return if VCSInfo.repo_root?(current)
          current = parent
          parent = File.dirname(current)
        end
        fatal "You don't appear to be in a directory of a supported vcs project."
        exit 1
      end
    end
  end
end