require 'glimmer-dsl-libui'
require 'facets'
require 'fileutils'

class MetaExample
  include Glimmer
  
  ADDITIONAL_BASIC_EXAMPLES = ['Color Button', 'Font Button', 'Form', 'Date Time Picker', 'Simple Notepad']
  
  attr_accessor :code_text
  
  def initialize
    @selected_example_index = examples_with_versions.index(basic_examples_with_versions.first)
    @code_text = File.read(file_path_for(selected_example))
  end
  
  def examples
    if @examples.nil?
      example_files = Dir.glob(File.join(File.expand_path('.', __dir__), '*.rb'))
      example_file_names = example_files.map { |f| File.basename(f, '.rb') }
      example_file_names = example_file_names.reject { |f| f == 'meta_example' || f.match(/\d$/) }
      @examples = example_file_names.map { |f| f.underscore.titlecase }
    end
    @examples
  end
  
  def basic_examples
    examples.select {|example| example.start_with?('Basic') || ADDITIONAL_BASIC_EXAMPLES.include?(example) }.sort
  end
  
  def advanced_examples
    (examples - basic_examples).sort
  end
  
  def examples_with_versions
    append_versions(examples)
  end
  
  def basic_examples_with_versions
    append_versions(basic_examples)
  end
  
  def advanced_examples_with_versions
    append_versions(advanced_examples)
  end
  
  def append_versions(examples)
    examples.map { |example| version_count_for(example) > 1 ? "#{example} (#{version_count_for(example)} versions)" : example }
  end
  
  def file_path_for(example)
    File.join(File.expand_path('.', __dir__), "#{example.underscore}.rb")
  end
  
  def version_count_for(example)
    Dir.glob(File.join(File.expand_path('.', __dir__), "#{example.underscore}*.rb")).select {|file| file.match(/#{example.underscore}\d\.rb$/)}.count + 1
  end
  
  def glimmer_dsl_libui_file
    File.expand_path('../lib/glimmer-dsl-libui', __dir__)
  end
  
  def selected_example
    examples[@selected_example_index]
  end
  
  def run_example(example)
    Thread.new do
      command = "#{RbConfig.ruby} -r #{glimmer_dsl_libui_file} #{example} 2>&1"
      result = ''
      IO.popen(command) do |f|
        sleep(0.00001) # yield to main thread
        f.each_line do |line|
          result << line
          puts line
          $stdout.flush # for Windows
          sleep(0.00001) # yield to main thread
        end
      end
      Glimmer::LibUI.queue_main { msg_box('Error Running Example', result) } if result.downcase.include?('error')
    end
  end
  
  def launch
    window('Meta-Example', 1000, 500) {
      margined true
      
      horizontal_box {
        vertical_box {
          stretchy false
          
          tab {
            stretchy false
            
            tab_item('Basic') {
              vertical_box {
                @basic_example_radio_buttons = radio_buttons {
                  stretchy false
                  items basic_examples_with_versions
                  selected basic_examples_with_versions.index(examples_with_versions[@selected_example_index])
                  
                  on_selected do
                    @selected_example_index = examples_with_versions.index(basic_examples_with_versions[@basic_example_radio_buttons.selected])
                    example = selected_example
                    self.code_text = File.read(file_path_for(example))
                    @version_spinbox.value = 1
                    @advanced_example_radio_buttons.selected = -1
                  end
                }
                
                label # filler
                label # filler
              }
            }
            
            tab_item('Advanced') {
              vertical_box {
                @advanced_example_radio_buttons = radio_buttons {
                  stretchy false
                  items advanced_examples_with_versions
                  selected -1
                  
                  on_selected do
                    @selected_example_index = examples_with_versions.index(advanced_examples_with_versions[@advanced_example_radio_buttons.selected])
                    example = selected_example
                    self.code_text = File.read(file_path_for(example))
                    @version_spinbox.value = 1
                    @basic_example_radio_buttons.selected = -1
                  end
                }
                
                label # filler
                label # filler
              }
            }
          }
          
          horizontal_box {
            label('Version') {
              stretchy false
            }
            
            @version_spinbox = spinbox(1, 100) {
              value 1
              
              on_changed do
                example = selected_example
                if @version_spinbox.value > version_count_for(example)
                  @version_spinbox.value -= 1
                else
                  version_number = @version_spinbox.value == 1 ? '' : @version_spinbox.value
                  example = "#{selected_example}#{version_number}"
                  self.code_text = File.read(file_path_for(example))
                end
              end
            }
          }
          
          horizontal_box {
            stretchy false
            
            button('Launch') {
              on_clicked do
                begin
                  parent_dir = File.join(Dir.home, '.glimmer-dsl-libui', 'examples')
                  FileUtils.mkdir_p(parent_dir)
                  example_file = File.join(parent_dir, "#{selected_example.underscore}.rb")
                  File.write(example_file, code_text)
                  example_supporting_directory = File.expand_path(selected_example.underscore, __dir__)
                  FileUtils.cp_r(example_supporting_directory, parent_dir) if Dir.exist?(example_supporting_directory)
                  FileUtils.cp_r(File.expand_path('../icons', __dir__), File.dirname(parent_dir))
                  FileUtils.cp_r(File.expand_path('../sounds', __dir__), File.dirname(parent_dir))
                  run_example(example_file)
                rescue => e
                  puts e.full_message
                  puts 'Unable to write code changes! Running original example...'
                  run_example(file_path_for(selected_example))
                end
              end
            }
            button('Reset') {
              on_clicked do
                version_number = @version_spinbox.value == 1 ? '' : @version_spinbox.value
                example = "#{selected_example}#{version_number}"
                self.code_text = File.read(file_path_for(example))
              end
            }
          }
        }
        
        @code_entry = non_wrapping_multiline_entry {
          text <=> [self, :code_text]
        }
      }
    }.show
  end
end

MetaExample.new.launch