task default: %w(develop)
begin
  require 'colorize'
  String.disable_colorization = false
rescue LoadError
end

require 'set'

STORY_DIR=File.join(ENV['USERPROFILE'], 'Documents\\Twine\\Stories')
STORY_TITLE = 'Volleyball'
STORY_FORMAT = 'SugarCube'
STORY_FORMAT_PATH = "story_formats/sugarcube-2.28.2-for-twine-2.1-local/sugarcube-2"
STORY_FORMAT_VERSION = '2.28.2'
STORY_RELEASE_TITLE = 'Volleyball Chapter 1 v0.5'

FILES = {
  '01_intro' => '01 Intro',
  '02_transform' => '02 Transform',
  '03_custom_girl' => '03 Custom Girl',
  '04_money_game' => '04 Money Games',
  '05_beaches' => '05 Beaches',
  '06_public_beach' => '06 Public Beach',
}

def files
  FILES.map do |short_name, long_name|
    OpenStruct.new({
      short_name: short_name,
      long_name: long_name,
      source_file: "story/#{short_name}.tw2",
      dest_file: File.join(STORY_DIR, "#{STORY_TITLE} - #{long_name}.html"),
      wrapper_file: "#{short_name}_wrapper.tw2",
    })
  end
end

task develop: %w(bundle_install storyjs story.tw2 story_title.tw2) do
  sh "bundle exec twee2 build '--format=#{STORY_FORMAT_PATH}' main.tw2 develop.html"
end

task watch: %w(bundle_install storyjs story.tw2 story_title.tw2) do
  sh 'start watch.html'  # FIXME non-windows
  sh "bundle exec twee2 watch '--format=#{STORY_FORMAT_PATH}'  main.tw2 watch.html"
end

task release: %w(bundle_install storyjs story.tw2 story_title.tw2) do
  sh "bundle exec twee2 build '--format=#{STORY_FORMAT_PATH}' main.tw2 release.html"
end

task :storyjs do
  File.write(
    'storyjs.tw2', 
    File.read('storyjs.tw2')\
      .sub(/\$STORY_FORMAT_VERSION = '[^']*'/, "$STORY_FORMAT_VERSION = '#{STORY_FORMAT_VERSION}'")
  )
end

file 'story.tw2' do
  File.open('story.tw2', 'w') do |f|
    f.puts('::StoryIncludes')
    files.each do |file|
      f.puts(file.source_file)
    end
  end
end

file 'story_title.tw2' do
  File.open('story_title.tw2', 'w') do |f|
    f.puts('::StoryTitle')
    f.puts("#{STORY_RELEASE_TITLE}")
  end
end

desc 'export sub files to Twine 2'
task export: %w(bundle_install storyjs story.tw2 story_title.tw2) do
  files.each do |file|
    IO.write file.wrapper_file, <<~EOF
      ::StoryTitle
      Volleyball - #{file.long_name}

      ::Twee2Settings [twee2]
      @story_start_name = 'Start #{file.long_name}'
      Twee2::build_config.story_format = '#{STORY_FORMAT}'
      Twee2::build_config.story_format_version = '#{STORY_FORMAT_VERSION}'
      Twee2::build_config.story_ifid = ''
      
      ::StoryIncludes
      images.tw2
      stylesheet.tw2
      storyjs.tw2
      #{file.source_file}
    EOF

    sh(
      'bundle', 'exec', 'twee2', 'export',
      "--format=#{STORY_FORMAT}", "--format-version=#{STORY_FORMAT_VERSION}",
      file.wrapper_file, file.dest_file,
    )
  end
  sh(
    'bundle', 'exec', 'twee2', 'export',
    "--format=#{STORY_FORMAT}", "--format-version=#{STORY_FORMAT_VERSION}",
    'main.tw2', STORY_DIR,
  )
end

desc 'import sub files from Twine 2'
task import: %w(bundle_install) do
  files.each do |file|
    sh(
      'bundle', 'exec', 'twee2', 'decompile',
      file.dest_file, file.source_file,
      '--exclude=StoryJS,StoryCSS,StoryTitle,Twee2Settings',
      '--exclude-from=../stylesheet.tw2,../storyjs.tw2,../stylesheet.tw2,../images.tw2',
    )
  end
end

task import_main: %w(bundle_install) do
  file_set = Set.new(files)
  base_excludes=%w[../stylesheet.tw2 ../storyjs.tw2 ../stylesheet.tw2 ../images.tw2]
  files.each do |file|
    other_files = (file_set - Set.new([file])).map { |f| File.basename(f.source_file) }
    excludes = other_files + base_excludes
    sh(
      'bundle', 'exec', 'twee2', 'decompile',
      File.join(STORY_DIR, STORY_RELEASE_TITLE + '.html'),
      './' + file.source_file,
      '--exclude=StoryJS,StoryCSS,StoryTitle,Twee2Settings',
      "--exclude-from=#{excludes.join(',')}",
    )
  end
end

task :bundle_install do
  sh 'bundle check || bundle install'
end

task :clean do
  # TODO
end

task :autofix do
  #check links
  files.each do |file|
    twee_source = File.read(file.source_file)
    twee_source = twee_source.lines.each_with_index.map do |line, lineno|
      line.chomp!
      
      line.gsub(%r{\[\[(?<link>[^\]]*?)\](?<link_mods>\[[^\]]*\])?\]}) do |m|
        link = $~[:link]
        link_mods = $~[:link_mods]

        case link.scan('->').length
        when 0
          # this style of link doesn't need to be quoted, but it also shouldn't contain special chars
          "[[#{link}]#{link_mods}]"
        when 1
          text, dest = link.split('->')
          quote_text = true
          if link.start_with?('"')
            text = text.end_with?('"') ? text[1..-2] : text[1..-1]
          elsif text.start_with?("'")
            text = text.end_with?("'") ? text[1..-2] : text[1..-1]
          elsif text =~ /\\|"/
            quote_text = true
          else
            quote_text = false
          end
          
          if quote_text
            text.gsub!(/(?<!\\)'/) { "\\'" }
            text.gsub!(/\\"/) { '"' }
            text.gsub!(/(?<!\\)\\(?!['\\])/) { "\\\\" }
            
            text = "'#{text}'"
          
            #FIXME This assumption seems dangerous?
            # if begins with a double quote ensures it ends with one too.
            if text[1] == '"' && text[-2] != '"'
              text = text[0..-3] + "\"'"
            end
          end
          
          "[[#{text}->#{dest}]#{link_mods}]"
        else
          # TODO this doesn't really happen very much in practice, so don't worry about an autofix, just passthru
          warn('multiple -> in link')
          "[[#{link}]#{link_mods}]"
        end
      end
    end.join("\n") + "\n"
    File.write(file.source_file, twee_source)
  end
end

task :lint do
  titles = Set.new
  passages = {}
  title = nil
  files.each do |file|
    twee_source = IO.read(file.source_file)
    twee_source.lines.each_with_index do |line, lineno|
      lineno += 1
      # check for duplicate
      if line.start_with?('::') && !line.start_with?('::StoryIncludes')
        title = line.match(/^:: *([^\[]*?) *(\[(.*?)\])? *(<(.*?)>)? *$/)[1]
        #puts title
        if title != 'Twee2Settings' && titles.include?(title)
          puts "#{file.source_file}:#{lineno} duplicate title #{title}".red
        end
        titles.add(title)
        passages[title] = {outbound_links: [], inbound_links: [], source_line: "#{file.source_file}:#{lineno}"}
      end
      
      # check links
      line
      .scan(%r{\[\[(.+?)\](\[(.+?)\])?\]})
      .map { |x| x[0] }
      .each do |link|
        case link.scan('->').length
        when 0
          #link contains no ->, probably not a problem
          text = dest = link
          passages[title][:outbound_links] << \
            { passage: dest, source_line: "#{file.source_file}:#{lineno}" }
        when 1
          # no problem
          text, dest = link.split('->')
          passages[title][:outbound_links] << \
            { passage: dest, source_line: "#{file.source_file}:#{lineno}" }
        else
          puts "#{file.source_file}:#{lineno} link contains multiple -> definitely a problem".colorize(:red)
          next
        end
        if text.start_with?('\'')
          if !text.end_with?('\'')
            puts "#{file.source_file}:#{lineno} link text (#{text.inspect}) does not end with single quote despite starting with one".colorize(:red)
            next
          end
          text = text[1..-2]
          text
          .to_enum(:scan, '\'')
          .map {Regexp.last_match.offset(0)[0]}
          .each do |offset|
            if text[offset - 1] != '\\'
              puts "#{file.source_file}:#{lineno} link text (#{text.inspect}) contains unquoted single quote in body".colorize(:red)
            end
          end
        elsif text.start_with?('"')
          if !text.end_with?('"')
            puts "#{file.source_file}:#{lineno} link text (#{text.inspect}) does not end with double quote despite starting with one".colorize(:red)
            next
          end
          text = text[1..-2]
          text
          .to_enum(:scan, '"')
          .map {Regexp.last_match.offset(0)[0]}
          .each do |offset|
            if text[offset - 1] != '\\'
              puts "#{file.source_file}:#{lineno} link text (#{text.inspect}) contains unquoted double quote in body".colorize(:red)
            end
          end
        elsif text =~ /\A[\[\]'"\\]*\z/
          puts "#{file.source_file}:#{lineno} link text (#{text.inspect}) contains special characters but is not quoted with single or double quotes".colorize(:red)
        end
      end
      # check for default text
      if line.strip == 'Double-click this passage to edit it.'
        puts "#{file.source_file}:#{lineno} has the default text \"Double-click this passage to edit it.\""
      end
      # check for TODO/FIXME
      if line.include?('TODO') || line.include?('FIXME')
        puts "#{file.source_file}:#{lineno} has TODO/FIXME text: #{line}"
      end
      # check for <<include>> as string
      if line.include?('<<include') && !line.include?('[[')
        puts "#{file.source_file}:#{lineno} has an <<include>>, but no link"
      end

    end
  end
  passages.each do |title, passage|
    passage[:outbound_links].each do |link|
      if passages[link[:passage]]
        passages[link[:passage]][:inbound_links] << {passage: title, source_file: passage[:source_line]}
      else
        puts "#{link[:source_line]} (title=#{title}) links to non-existent passage #{link[:passage]}".red
      end
    end
  end
  passages.each do |title, passage|
    if passage[:inbound_links].empty? && title != 'Twee2Settings'
      puts "#{passage[:source_line]} (title=#{title}) has no inbound links"
    end
  end
end