#!/usr/bin/env ruby
require 'curses'
require 'optparse'

lib = File.expand_path("../../lib", __FILE__)
$LOAD_PATH.unshift lib unless $LOAD_PATH.include?(lib) # enable local development

def parse_options
  options = {}
  parser = OptionParser.new do |opts|
    opts.banner = <<-BANNER.gsub(/^ {6}/, "")
      [Ru]by [Co]mmandline editor

      Shortcuts:
       Ctrl+w/q   Exit
       Ctrl+s     Save

      Usage:
          ruco FILE

      Options:
    BANNER
    opts.on("-c", "--convert-tabs","Convert tabs to spaces") { options[:convert_tabs] = true }
    opts.on("-u", "--undo-stack-size SIZE","Maximum size of the undo stack.  0 allows for a complete undo stack.") { |size| options[:undo_stack_size] = size.to_i }
    opts.on("-n", "--no-colors","No colors -- helps performance / broken terminals") { options[:no_colors] = true }
    opts.on("--colors","Force colors -- everything could be black") { options[:colors] = true }
    opts.on("--debug-cache","Show caching in action") { options[:debug_cache] = true }
    opts.on("--debug-keys", "Show pressed keys") { options[:debug_keys] = true }
    opts.on("-v", "--version","Show Version") do
      require 'ruco/version'
      puts Ruco::VERSION
      exit
    end
    opts.on("-h", "--help","Show this.") { puts opts; exit }
  end
  parser.parse!

  if ARGV.empty?
    puts parser
    exit
  end

  options
end

def log(stuff)
  File.open('ruco.log','ab') { |f| f.puts stuff }
end

options = parse_options

options[:colors] = if options[:no_colors]
  false
elsif options[:colors]
  true
else
  # so far the only terminal that supports it:
  # - xterm-256color on osx
  # - xterm on ubuntu 10.04+
  if RbConfig::CONFIG['host_os'] !~ /mswin|mingw/
    if ENV["TERM"] == 'xterm-256color'
      true
    else
      require 'ruco/file_store'
      if ENV['TERM'] == 'xterm'
        # switch terminal, so curses knows we want colors
        # setting ENV['TERM'] will sometimes crash un-rescue-able -> test if it works
        possible = Ruco::FileStore.new('~/.ruco/cache').cache('color_possible') do
          system(%{TERM=xterm-256color ruby -r curses -e 'Curses.noecho' > /dev/null 2>&1})
        end
        ENV['TERM'] = 'xterm-256color' if possible
      end
    end
  end
end
$ruco_colors = options[:colors]

require 'ruco'

# draw app and redraw after each keystroke (or paste)
Dispel::Screen.open(options) do |screen|
  $ruco_screen = screen

  app = Ruco::Application.new(
    ARGV[0],
    :convert_tabs => options[:convert_tabs],
    :undo_stack_size => options[:undo_stack_size],
    :lines => screen.lines, :columns => screen.columns
  )

  screen.draw *app.display_info

  Dispel::Keyboard.output do |key|
    screen.debug_key(key) if options[:debug_keys]
    if key == :resize
      app.resize(screen.lines, screen.columns)
    else
      result = app.key key
      break if result == :quit
    end

    screen.draw *app.display_info
  end
end