#!/usr/bin/env ruby 
require 'yaml'      # For reading input
require 'json'      # <--- REQUIRED FOR OUTPUT
require 'fileutils'
require 'pathname'
require 'net/http'
require 'uri'
require 'erb'

if ! ENV['IMPORT_INSTANCES']
  exit 0 # nothing to do
end

INPUT_ROOT_DIR = '/root/instances'
OUTPUT_ROOT_DIR = '/mnt/instances'

FileUtils.mkdir_p(OUTPUT_ROOT_DIR)

puts "scanning yaml-files in /root/instances"

# 2. Iterate over all 'room.yaml' files recursively
Dir.glob(File.join(INPUT_ROOT_DIR, '**', 'room.yaml')).each do |input_file_path|
  
  begin
    input_data = YAML.load_file(input_file_path)
  rescue StandardError => e
    puts "  ❌ Error reading or parsing YAML: #{e.message}"
    next
  end

  relative_path = Pathname.new(input_file_path).relative_path_from(Pathname.new(INPUT_ROOT_DIR))
  path_components = relative_path.to_s.split(File::SEPARATOR)
  
  unless path_components.length >= 4
    puts "  ⚠️ Skipping: Path structure too shallow. Expected SERVER/AUTHOR/ROOM_NAME/room.yaml"
    next
  end
  
  server_name = path_components[0]
  author_name = path_components[1]
  room_name   = path_components[2]

  begin
    u = input_data['url']
    r = Net::HTTP.new(URI.parse(u).host, URI.parse(u).port)
    r.use_ssl = (URI.parse(u).scheme == 'https')
    
    a = r.request(Net::HTTP::Head.new(URI.parse(u).request_uri))
    
    if a.code.to_i != 200
      puts "  ⚠️ Skipping:HTTP code #{a.code} received :/"
      next
    end

    # 5. Construct the final data structure (Hash)
    output_data = {}
    output_data['homepage']    = input_data['url']
    output_data['name']        = input_data['title']
    output_data['description'] = input_data['description']
    output_data['image']       = input_data['thumbnail']
    output_data['tags']        = [server_name]
    
    output_dir = File.join(OUTPUT_ROOT_DIR, author_name, room_name)
    output_file_path = File.join(output_dir, 'datapackage.json')
    
    begin

      url = URI(input_data['thumbnail'])
      output_path = output_dir+"/.xrforge/thumbnail.jpg"

      Net::HTTP.start(url.host, url.port, use_ssl: url.scheme == "https") do |http|
        request = Net::HTTP::Get.new(url)
        http.request(request) do |response|
          raise "Download failed: #{response.code}" unless response.is_a?(Net::HTTPSuccess)

          File.open(output_path, "wb") do |file|
            response.read_body do |chunk|
              file.write(chunk)
            end
          end
        end
      end

      if a.code.to_i != 200
        puts "  ⚠️ Skipping:HTTP code #{a.code} receivedfor thumbnail :/"
        next
      end

      # write datapackage.json
      FileUtils.mkdir_p(output_dir) # Create directory (including parents)
      File.write(output_file_path, JSON.pretty_generate(output_data))
      puts "  ✅ HTTP 200: Wrote #{output_file_path}"
     
      # write janusxr.html + scene.jml
      templateDir  = File.dirname(__FILE__)+"/../../templates/"
      FileUtils.mkdir_p(output_dir+"/.xrforge") # Create directory (including parents)
      data  = output_data
      data['title'] = output_data['name'] 
      $links        = []
      janusweb_src  = ENV['DEV'] ? "/mnt/janusweb/janusweb.js" : "/mnt/janusweb/janusweb.min.js"
      jml  = ERB.new( File.read( templateDir+"JML/portalAR.erb" ) ).result(binding)
      html = ERB.new( File.read( templateDir+"JML/client.html") ).result(binding)
      File.write(output_dir+"/.xrforge/scene.jml", jml )
      puts "  ✅ Wrote #{output_dir}/.xrforge/scene.jml"
      File.write(output_dir+"/.xrforge/janusxr.html", html )
      puts "  ✅ Wrote #{output_dir}/.xrforge/janusxr.html"
     
    rescue StandardError => e
      puts "  ❌ Error writing output file: #{e.message}"
    end
  rescue StandardError => e
    # Optionally handle error quietly or output e.message
  end
  
end