class Fanforce::CLI::Files

# CONFIG.RU #######################################################################

  def self.create_config_ru(app)
    file = config_ru_required_lines.join("\n") + "\n\n"
    if (fanforce_config_lines = fanforce_config_lines(app._id)).size > 0
      file += "FanforceApp.config do |config|\n"
      file += fanforce_config_lines.map {|k,v| "  #{k} = #{v}"}.join("\n") + "\n"
      file += "end\n"
    end
    file += "run FanforceApp\n"
    File.open("#{app.dir}/config.ru", 'w') {|f| f.write file }
  end

  def self.update_config_ru(app)
    return create_config_ru(app) if !File.exists?("#{app.dir}/config.ru")

    lines = File.open("#{app.dir}/config.ru", 'r') {|f| f.readlines}

    lines.clone.each {|l| lines.delete(l) if config_ru_required_lines.include?(l.strip) }
    config_ru_required_lines.reverse.each {|l| lines.unshift(l+"\n") }

    config_options = extract_fanforce_config_options(lines, 'config.ru')

    fanforce_config_keys_to_require.each do |k|
      config_options[k] = fanforce_config_lines(app._id)[k] if config_options[k].blank?
    end

    fanforce_config_keys_to_overwrite.each do |k|
      config_options[k] = fanforce_config_lines(app._id)[k]
    end

    lines = replace_fanforce_config_options_in_config_ru(lines, config_options)

    File.open("#{app.dir}/config.ru", 'w') {|f| f.write(lines.join('')) }
  end

  def self.replace_fanforce_config_options_in_config_ru(lines, config_options)
    if (block = extract_fanforce_config_block(lines, 'config.ru'))
      new_block  = "FanforceApp.config do |config|\n"
      new_block += config_options.map {|k,v| "  #{k} = #{v}"}.join("\n") + "\n"
      new_block += "end\n"
      new_block += "run FanforceApp"
    else
      block = extract_run_fanforce_line(lines)
      new_block = "run FanforceApp"
    end
    lines.join('').gsub(block[:code], new_block).lines.to_a
  end

  def self.config_ru_required_lines
    [
        "require 'bundler'; Bundler.setup",
        "require 'fanforce/app_factory'"
    ]
  end

  # RAKEFILE #######################################################################

  def self.create_rakefile(app)
    file = rakefile_required_lines.join("\n") + "\n\n"
    if (fanforce_config_lines = fanforce_config_lines(app._id)).size > 0
      file += "FanforceApp.config do |config|\n"
      file += fanforce_config_lines.map {|k,v| "  #{k} = #{v}"}.join("\n") + "\n"
      file += "end\n"
    end
    file += "load 'fanforce/app_factory.rake'\n"
    File.open("#{app.dir}/Rakefile", 'w') {|f| f.write file }
  end

  def self.update_rakefile(app)
    return create_rakefile(app) if !File.exists?("#{app.dir}/Rakefile")

    lines = File.open("#{app.dir}/Rakefile", 'r') {|f| f.readlines}

    lines.clone.each {|l| lines.delete(l) if rakefile_required_lines.include?(l.strip) }
    rakefile_required_lines.reverse.each {|l| lines.unshift(l+"\n") }

    config_options = extract_fanforce_config_options(lines, 'Rakefile')

    fanforce_config_keys_to_require.each do |k|
      config_options[k] = fanforce_config_lines(app._id)[k] if config_options[k].blank?
    end

    fanforce_config_keys_to_overwrite.each do |k|
      config_options[k] = fanforce_config_lines(app._id)[k]
    end

    lines = replace_fanforce_config_options_in_rakefile(lines, config_options)

    File.open("#{app.dir}/Rakefile", 'w') {|f| f.write(lines.join('')) }
  end

  def self.replace_fanforce_config_options_in_rakefile(lines, config_options)
    if (block = extract_fanforce_config_block(lines, 'Rakefile'))
      new_block  = "FanforceApp.config do |config|\n"
      new_block += config_options.map {|k,v| "  #{k} = #{v}"}.join("\n") + "\n"
      new_block += "end\n"
      new_block += "load 'fanforce/app_factory.rake'"
    else
      block = extract_load_fanforce_line(lines)
      new_block = "load 'fanforce/app_factory.rake'"
    end
    lines.join('').gsub(block[:code], new_block).lines.to_a
  end

  def self.rakefile_required_lines
    [
        "require 'bundler'; Bundler.setup",
        "require 'fanforce/app_factory'"
    ]
  end

  ########################################################################

  def self.extract_load_fanforce_line(lines)
    code = lines.join('')
    regex = Regexp.compile('( *load\s+(\'|")fanforce/app_factory.rake(\'|"))', Regexp::MULTILINE)
    if code !~ regex
      raise "No valid \"load 'fanforce/app_factory.rake'\" line was found in your Rakefile."
    end
    {:code => $1}
  end

  def self.extract_run_fanforce_line(lines)
    code = lines.join('')
    regex = Regexp.compile('( *run\s+FanforceApp)', Regexp::MULTILINE)
    if code !~ regex
      raise "No valid \"run FanforceApp\" line was found in your config.ru."
    end
    {:code => $1}
  end

  def self.extract_fanforce_config_block(lines, filename)
    code = lines.join('')
    regex = Regexp.compile('( *FanforceApp\.config\s*(do|{)\s*\|\s*([A-Za-z]+)\s*\|(.*)(end|})\s*(run\s+FanforceApp|load\s+(\'|")fanforce/app_factory.rake(\'|")))', Regexp::MULTILINE)
    if code !~ regex || ($2 == '{' and $5 != '}') || ($2 == 'do' and $5 != 'end')
      return nil
    end
    {
        :code          => $1,
        :start_keyword => $2,
        :config_var    => $3,
        :config_code   => $4,
        :end_keyword   => $5
    }
  end

  def self.extract_fanforce_config_options(lines, filename)
    block = extract_fanforce_config_block(lines, filename)
    return [] if !block
    regex = Regexp.compile(block[:config_var]+'\.([\w]+)\s*=\s*(((?!'+block[:config_var]+'\.).)+)', Regexp::MULTILINE)
    block[:config_code].scan(regex).inject({}) {|result, match| result.update "config.#{match[0]}" => match[1].strip }
  end

  def self.fanforce_config_lines(app_id)
    lines = {}
    return lines
  end

  def self.fanforce_config_keys_to_require
    []
  end

  def self.fanforce_config_keys_to_overwrite
    keys = []
    return keys
  end

  # GEMFILE #######################################################################

  def self.create_gemfile(app)
    file  = gemfile_source_lines.join("\n") + "\n"
    file += gemfile_ruby_version + "\n\n"
    file += gemfile_factory_line + "\n\n"
    File.open("#{app.dir}/Gemfile", 'w') {|f| f.write file }
  end

  def self.update_gemfile(app)
    return create_gemfile(app) if !File.exists?("#{app.dir}/Gemfile")

    lines = File.open("#{app.dir}/Gemfile", 'r') {|f| f.readlines}.map {|l| l.strip }
    gemfile_source_lines.reverse.each {|l| lines.delete(l); lines.unshift(l) }

    lines.clone.each {|l| lines.delete(l) if l =~ /^ruby .+/ }
    lines.each_with_index do |l,i|
      next if l =~ /^source .+/
      lines.insert(i, gemfile_ruby_version) and break
    end

    lines = lines.map do |l|
      l.include?("gem 'fanforce-app-factory'") ? gemfile_factory_line : l
    end
    lines << gemfile_factory_line if !lines.include?(gemfile_factory_line)

    File.open("#{app.dir}/Gemfile", 'w') {|f| f.write(lines.join "\n") }
  end

  def self.gemfile_source_lines
    [
      "source 'https://rubygems.org'",
    ]
  end

  def self.gemfile_ruby_version
    "ruby '1.9.3'"
  end

  def self.gemfile_factory_line
    line = "gem 'fanforce-app-factory'"
    return line if !$Config[:app_factory_gem].is_a?(Hash)

    line += ", '#{$Config[:app_factory_gem][:version]}'" if $Config[:app_factory_gem][:version].present?
    line += ", :path => '#{$Config[:app_factory_gem][:path]}'" if $Config[:app_factory_gem][:path].present?
    line += ", :git => '#{$Config[:app_factory_gem][:git]}'" if $Config[:app_factory_gem][:git].present?
    line
  end

  # .GITIGNORE #######################################################################

  def self.create_gitignore(app)
    file = gitignore_lines.join("\n") + "\n"
    File.open("#{app.dir}/.gitignore", 'w') {|f| f.write file }
  end

  def self.update_gitignore(app)
    return create_gitignore(app) if !File.exists?("#{app.dir}/.gitignore")

    lines = File.open("#{app.dir}/.gitignore", 'r') {|f| f.readlines}.map {|l| l.strip }

    gitignore_lines.each do |line|
      lines << line if !lines.include?(line)
    end

    File.open("#{app.dir}/.gitignore", 'w') {|f| f.write(lines.join "\n") }
  end

  def self.gitignore_lines
    %w(*.gem *.rbc .bundle .config coverage InstalledFiles lib/bundler/man pkg rdoc spec/reports test/tmp test/version_tmp tmp .idea/ .sass-cache/ .DS_STORE .powenv .pluginenv .appenv .widgetenv .*env.rb .yardoc _yardoc doc/)
  end

  # .POWENV #######################################################################

  def self.create_powenv(app)
    file = powenv_lines.join("\n") + "\n"
    File.open("#{app.dir}/.powenv", 'w') {|f| f.write file }
  end

  def self.update_powenv(app)
    return create_powenv(app) if !File.exists?("#{app.dir}/.powenv")

    lines = File.open("#{app.dir}/.powenv", 'r') {|f| f.readlines}.map {|l| l.strip }

    powenv_lines.each do |line|
      lines << line if !lines.include?(line)
    end

    File.open("#{app.dir}/.powenv", 'w') {|f| f.write(lines.join "\n") }
  end

  def self.powenv_lines
    ['source .appenv']
  end

end