require_relative 'lib/kgrader'

def die(error)
  abort "fatal: [#{error.class}] #{error}"
end

def run
  yield KGrader::CLI.new Rake.application.original_dir
rescue KGrader::KGraderError => err
  die err
end

def parse_args(num, keywords = {})
  args, options = KGrader::parse_args ARGV.drop(1), num, keywords
  args.each { |arg| task arg.to_sym {} unless arg.nil? }
  args + [options]
rescue KGrader::KGraderError => err
  die err
end

task :default => :help do ; end

task :help do
  puts %{usage:
- rake list   [<course>] [<semester>]
- rake roster <course> <rosterfile> [<semester>]
- rake grade  <course> <assignment> [semester=<...>] [students=<...>]
              [due=<...>] [fetch=<yes/no>] [regrade=<yes/no>]
- rake commit <course> <assignment> [semester=<...>] [students=<...>]
- rake clean
- rake clobber}
end

task :list do
  course, semester = parse_args 0..2
  run { |cli| cli.list course, semester }
end

task :roster do
  course, rosterfile, semester = parse_args 2..3
  run { |cli| cli.roster course, semester, rosterfile }
end

task :grade do
  course, assignment, options = parse_args 2..2,
    { :semester => :string, :students => :array, :due => :time,
      :fetch => :bool, :regrade => :bool }
  run { |cli| cli.grade course, options[:semester], assignment, options }
end

task :commit do
  course, assignment, options = parse_args 2..2,
    { :semester => :string, :students => :array }
  run { |cli| cli.commit course, options[:semester], assignment, options }
end

task :clean do
  run { |cli| cli.clean }
end

task :clobber do
  run { |cli| cli.clobber }
end