class Jars::MavenVersion

def convert(arg, low = nil, high = nil)
  if arg.include?('~>')
    val = arg.sub(/~>\s*/, '')
    last = val.include?('.') ? val.sub(/\.[0-9]*[a-z]+.*$/, '').sub(/\.[^.]+$/, '.99999') : '99999'
    ["[#{snapshot_version(val)}", "#{snapshot_version(last)}]"]
  elsif arg.include?('>=')
    val = arg.sub(/>=\s*/, '')
    ["[#{snapshot_version(val)}", (nil || high)]
  elsif arg.include?('<=')
    val = arg.sub(/<=\s*/, '')
    [(nil || low), "#{snapshot_version(val)}]"]
  # treat '!' the same way as '>' since maven can not describe such range
  elsif /[!>]/.match?(arg)
    val = arg.sub(/[!>]\s*/, '')
    ["(#{snapshot_version(val)}", (nil || high)]
  elsif arg.include?('<')
    val = arg.sub(/<\s*/, '')
    [(nil || low), "#{snapshot_version(val)})"]
  elsif arg.include?('=')
    val = arg.sub(/=\s*/, '')
    # for prereleased version pick the maven version (no version range)
    if /[a-z]|[A-Z]/.match?(val)
      [val, val]
    else
      ["[#{val}", "#{val}.0.0.0.0.1)"]
    end
  else
    # no conversion here, i.e. assume maven version
    [arg, arg]
  end
end

def new(*args)
  if args.empty? || (args.size == 1 && args[0].nil?)
    nil
  else
    low, high = convert(args[0])
    low, high = convert(args[1], low, high) if /[=~><]/.match?(args[1])
    if low == high
      low
    else
      super "#{low || '[0'},#{high || ')'}"
    end
  end
end

def snapshot_version(val)
  if val.match(/[a-z]|[A-Z]/) && !val.match(/-SNAPSHOT|[${}]/)
    "#{val}-SNAPSHOT"
  else
    val
  end
end