# frozen_string_literal: true
require 'erb'
require 'fileutils'
require_relative 'exe_helpers'

module LeapSalesforce
  # Generators for creating code
  module Generator
    # @param [String] filename Relative filename to this file
    # @param [Binding] binding Binding object used for ERB variables
    # @return [String] Interpreted file after calculating ERB for template file passed
    def read_template(filename, binding)
      ERB.new(File.read(File.join(__dir__, 'templates', filename))).result(binding)
    end

    # Generate file creating necessary folder if necessary
    # @param [String] filename Name of file to generate
    # @param [String] content Content to put within file
    def generate_file(filename, content, overwrite: true)
      FileUtils.mkdir_p File.dirname filename unless File.directory? File.dirname(filename)
      return puts "File '#{filename}' already exists, skipping..." if (File.exist?(filename) && !overwrite)

      File.write filename, content
      puts "Created file at #{filename}"
    end

    # @example Create a spec_helper file and test file in spec folder
    #   generate_files [ { spec: [ 'spec_helper.rb', 'limit_spec.rb' ] } ]
    # @param [Hash] list_of_files Hash of files to generate for
    def generate_files(binding, list_of_files, folder: nil)
      return create_inner_file(folder, list_of_files, binding) unless list_of_files.respond_to? :each

      list_of_files.each do |item|
        if item.is_a? Hash # Go one level deeper
          item.each do |inner_folder, sub_files|
            inner_folder = inner_folder.to_s
            current_folder = folder ? File.join(folder, inner_folder) : inner_folder
            generate_files binding, sub_files, folder: current_folder
          end
        else
          create_inner_file folder, item, binding
        end
      end
    end

    def create_inner_file(folder, name, binding)
      item = name.to_s
      path = folder ? File.join(folder, item) : item
      generate_from_template path, binding
    end

    # Generate file from template
    # @param [String] template_name Path to file with templates folder to use as template
    # @param [Binding] binding Binding object used for ERB variables
    def generate_from_template(template_name, binding)
      content = read_template "#{template_name}.erb", binding
      generate_file template_name, content, overwrite: false
    end
  end
end