namespace :cul do
  namespace :wp do
    after :deploy, 'cul:wp:symlink_custom_plugins_and_themes'

    desc "Creates symlinks for custom plugins and themes as part of a WordPress deployment. Generally run as an `after :deploy` hook."
    task :symlink_custom_plugins_and_themes do
      symlink_custom_plugins_and_themes
    end

    # Runs normal deploy task, downloads new copy of WP, sets up docroot, runs
    # deploy command, sets up symlinks. Does not run WP install and does not
    # create any wp users.
    desc "Sets up a WordPress docroot and runs deployment; does not install wordpress and does not create any users"
    task :setup do
      puts "Deploying repo branch: #{fetch(:branch)}"

      set :wp_version, ask('WordPress version to download:', 'latest')
      # Printing out wp_version here because the `set` command above only runs
      # the first time its associated symbol is referenced, and we want to
      # capture version before running any other commands.
      puts "Setting up wp_version: #{fetch(:wp_version)}"

      require_cap_params!([:branch, :wp_version, :wp_docroot, :wp_data_path])

      on roles(:web) do
        wp_docroot_wp_config_file_path = File.join(fetch(:wp_docroot), 'wp-config.php')
        wp_docroot_robots_txt_file_path = File.join(fetch(:wp_docroot), 'robots.txt')
        wp_docroot_wp_content_path = File.join(fetch(:wp_docroot), 'wp-content')

        shared_wp_config_file_path = shared_path.join('wp-config.php')
        shared_robots_txt_file_path = shared_path.join('robots.txt')

        wp_data_wp_content_path = File.join(fetch(:wp_data_path), 'wp-content')

        invoke 'deploy' # Deploy before doing setup

        # Create nginx logs directory if it doesn't already exist
        execute :mkdir, '-p', deploy_path.join('logs')

        # Make full path to wp_docroot directory if not exist
        execute :mkdir, '-p', fetch(:wp_docroot)

        # Make full path to wp_data_path if not exist
        execute :mkdir, '-p', fetch(:wp_data_path)

        # If wp_docroot/wp-includes does not exist, do wordpress download
        unless test("[ -d #{File.join(fetch(:wp_docroot), 'wp-includes')} ]")
          # Download and unpack new WP instance to wp_docroot
          execute :wp, 'core', ['download', "--version=#{fetch(:wp_version)}", "--path=#{fetch(:wp_docroot)}"]
        end

        # Check for wp-config.php file in shared. Create if it doesn't exist.
        unless test("[ -f #{shared_wp_config_file_path} ]")
          # If no wp-config.php file is found in the 'shared' directory, copy WordPress built-in wp-config-sample.php to there
          execute :cp, File.join(fetch(:wp_docroot), 'wp-config-sample.php'), shared_wp_config_file_path
        end

        # Delete original wp-sample-config.php
        execute :rm, '-f', File.join(fetch(:wp_docroot), 'wp-config-sample.php')
        # Create symlink for wp_document_root wp-config.php to 'shared' version.
        execute :ln, '-sf', shared_wp_config_file_path, wp_docroot_wp_config_file_path

        # Check for robots.txt file in shared. Create if it doesn't exist.
        unless test("[ -f #{shared_robots_txt_file_path} ]")
          execute "echo -e \"User-agent: *\nDisallow: /\" > #{shared_robots_txt_file_path}"
        end
        # Create symlink for wp_document_root robots.txt to 'shared' version.
        execute :ln, '-sf', shared_robots_txt_file_path, wp_docroot_robots_txt_file_path

        # Check for wp-content directory at wp_data_wp_content_path. Create if it doesn't exist.
        unless test("[ -d #{wp_data_wp_content_path} ]")
          # If no wp-config.php file is found in the 'shared' directory, copy WordPress built-in wp-config-sample.php to there
          execute :cp, '-r', wp_docroot_wp_content_path, wp_data_wp_content_path
        end
        # Delete original wp-content directory
        execute :rm, '-rf', wp_docroot_wp_content_path
        # Create symlink for wp_document_root wp-content to wp_data_wp_content_path
        execute :ln, '-sf', wp_data_wp_content_path, wp_docroot_wp_content_path
      end

      symlink_custom_plugins_and_themes
    end

    desc "Runs a WordPress installation for a newly set up instance and creates a new admin user"
    task :install do
      puts "Please provide administrative credentials:"
      ask(:admin_user, "Admin username:")
      ask(:admin_password, "Admin password:")
      ask(:admin_email, "Admin email:")

      require_cap_params!([:url, :title, :admin_user, :admin_password, :admin_email])

      on roles(:web) do
        within fetch(:wp_docroot) do
          execute :wp, 'core', fetch(:multisite) ? 'multisite-install' : 'install',
            "--url='#{fetch(:url)}'",
            "--title='#{fetch(:title)}'",
            "--admin_user='#{fetch(:admin_user)}'",
            "--admin_password='#{fetch(:admin_password)}'",
            "--admin_email='#{fetch(:admin_email)}'"
        end
      end
    end

    def self.require_cap_params!(vars)
      validate vars do |key, value|
        if value.nil? || value.empty?
          raise Capistrano::ValidationError, "Missing required parameter #{key}"
        end
      end
    end

    def self.symlink_custom_plugins_and_themes
      on roles(:web) do
        wp_data_wp_content_path = File.join(fetch(:wp_data_path), 'wp-content')
        wp_data_plugin_path = File.join(wp_data_wp_content_path, 'plugins')
        wp_data_themes_path = File.join(wp_data_wp_content_path, 'themes')

        if test("[ -d #{wp_data_wp_content_path} ]")
          # Remove old symlinks
          [wp_data_plugin_path, wp_data_themes_path].each do |dir|
            execute :find, dir, '-maxdepth 1', '-type l', '-exec rm {} \;'
          end

          # Add latest symlinks
          fetch(:wp_custom_plugins, {}).each do |plugin, repo_relative_path|
            execute :ln, '-sf', File.join(current_path, repo_relative_path), File.join(wp_data_plugin_path, plugin)
          end

          fetch(:wp_custom_themes, {}).each do |theme, repo_relative_path|
            execute :ln, '-sf', File.join(current_path, repo_relative_path), File.join(wp_data_themes_path, theme)
          end
        end
      end
    end
  end
end