class SvelteOnRails::Lib::ViewHelperSupport

def cache_key
  @cache_key
end

def cache_key_primary
  @cache_key_primary
end

def custom_cache_key
  if @helper_options[:cache_key]
    k2 = (@helper_options[:cache_key])
    keys = k2.is_a?(Array) ? k2 : [k2]
    keys.map do |k|
      if k.is_a?(ActiveRecord::Base)
        "#{k.class.name}#{k.id}"
      elsif k == nil
        'nil'
      elsif k.present?
        k.to_s
      else
        "empty-#{k.class}"
      end
    end.join('-')
  end
end

def debug?
  @helper_options[:debug]
end

def debug_log(message)
  if debug?
    Rails.logger.debug("  [svelte_component] #{message} (#{elapsed_milliseconds} ms)")
  end
end

def determine_ssr
  _ssr = if @helper_options.key?(:ssr)
           if @conf.watch_changes?
             unless [true, false, :auto].include?(@helper_options[:ssr])
               raise "Only true, false, or :auto are allowed for the argument #ssr"
             end
           end
           @helper_options[:ssr]
         else
           @conf.ssr
         end
  _ssr == :auto ? request.headers[conf.non_ssr_request_header].blank? : _ssr
end

def elapsed_milliseconds
  ((Time.now - @start_time) * 1000).round(1)
end

def file_case_sensitive_message
  ff = conf.frontend_folder
  cf = conf.components_folder
  "svelte-on-rails gem, view helper #svelte_component\n\n" +
    "File found but Upper and lower case letters are incorrect:\n" +
    "(This check is only on development environments when watch_changes is true)\n\n" +
    "#{conf.components_folder_full + "#{filename}.svelte"}\n\n" +
    "Your configurations are:\nfrontend_folder: «#{ff}»\ncomponents_folder: «#{cf}»\n.. and the filename attribute for the view helper: «#{filename}»\n"
end

def file_not_found_message
  ff = conf.frontend_folder
  cf = conf.components_folder
  "svelte-on-rails gem, view helper #svelte_component\n\nFile not found:\n" +
    "#{conf.components_folder_full + "#{filename}.svelte"}\n\n" +
    "Your configurations are:\n\nfrontend_folder: «#{ff}»\ncomponents_folder: «#{cf}»\n.. and the filename attribute for the view helper: «#{filename}»\n"
end

def generate_cache_key
  mtime_file = @conf.ssr_dist_folder.join('last_mtime')
  mtime = File.read(mtime_file)
  filename_part = [
    "#{filename.split('/').last}.svelte",
    Zlib.crc32(filename).to_s(36),
    custom_cache_key
  ].compact.join('-')
  @cache_key_primary = [
    conf.redis_cache_store[:namespace] ? conf.redis_cache_store[:namespace] : "svelte-on-rails:#{Rails.env}",
    filename_part,
  ].join(':')
  last_part = [
    (@conf.watch_changes? ? Zlib.crc32(mtime).to_s(36) : nil),
    @args_checksum
  ].compact.join('-')
  @cache_key = [@cache_key_primary, last_part].join(':')
end

def initialize(file, args, request, caching = false)
  @start_time = Time.now
  @filename = (file.match(/\.svelte$/) ? file[0..-8] : file)
  @args_checksum = Zlib.crc32(args.to_json).to_s(36)
  @conf = SvelteOnRails::Configuration.instance
  @helper_options, @html_options, @svelte_props = split_props(
    args,
    %i[class id style],
    %i[ssr hydrate debug cache_key expires_in]
  )
  @request = request
  @ssr = determine_ssr
  validate_file if @conf.watch_changes?
  # precompile
  if !Dir.exist?(@conf.ssr_dist_folder) || @conf.watch_changes?
    SvelteOnRails::Lib::Utils.watch_changes_and_precompile
  end
  # caching
  if caching
    raise '[svelte-on-rails] Caching required but Redis is not defined' unless defined?(Redis)
  else
    raise '[svelte-on-rails] :expires_in is not allowed for this helper' if @helper_options.key?(:expires_in)
    raise '[svelte-on-rails] :cache_key is not allowed for this helper' if @helper_options.key?(:cache_key)
    return
  end
  generate_cache_key
end

def log_rendering(message)
  Rails.logger.info "  #{message} (#{elapsed_milliseconds}ms)"
end

def redis_expiration_seconds
  (conf.redis_cache_store[:expires_in] || @helper_options[:expires_in] || 1.hour).to_i
end

def render_ssr
  renderer = SvelteOnRails::Renderer.new(filename)
  renderer.render(@svelte_props)
end

def split_props(args, html_options, helper_options)
  prp = {}
  hlp_opts = {}
  ht_opts = {
    data: {
      svelte_component: "/#{conf.components_folder + filename}",
      controller: 'svelte-on-rails',
    }
  }
  args.each do |k, v|
    _k = k.to_sym
    if helper_options.include?(_k)
      hlp_opts[_k] = v
    elsif html_options.include?(_k)
      ht_opts[_k] = v
    else
      prp[_k] = v
    end
  end
  ht_opts[:class] = "#{ht_opts[:class]} svelte-component".strip
  ht_opts[:data][:props] = prp.to_json
  ht_opts[:data][:svelte_status] = 'do-not-hydrate-me' if hlp_opts[:hydrate] == false
  [hlp_opts, ht_opts, prp]
end

def ssr?
  @ssr
end

def validate_file
  file_path = conf.components_folder_full + "#{filename}.svelte"
  unless File.exist?(file_path)
    raise file_not_found_message
  end
  if conf.watch_changes? && !SvelteOnRails::Lib::Utils.file_exist_case_sensitive?(conf.components_folder_full, "#{filename}.svelte")
    raise file_case_sensitive_message
  end
end