# TODO: Write documentation for `Kotatsu`

require "option_parser"
require "http/server"
require "json"

module Kotatsu
  VERSION = "0.1.0"
  CONFIG_DIR = Path.new(Path.home, ".config", "kotatsu")
  CONFIG_FILE = Path.new(CONFIG_DIR, "config.json")

  def self.buildConfig()
    conf = JSON.build do |json|
      json.object do
        json.field "config_version", 1
        json.field "port", 8080
        json.field "title", "Kotatsu"
        json.field "services" do
          json.array do
            json.array do
              json.string "Peko! Peko! Peko!"
              json.string "https://peko.dance/"
              json.string "none"
            end
            json.array do
              json.string "Entertainment Company"
              json.string "https://hololive.dance/"
              json.string "none"
            end
          end
        end
      end
    end
    return conf
  end

  def self.makeConfig(file, dir)
    puts "Creating new config file in #{file}"
    if Dir.exists?(dir) == false
      Dir.mkdir(dir)
      if Dir.exists?(dir) == false
        STDERR.puts "ERROR! Could not create directory: #{dir}"
        exit(1)
      end
    end
    File.write(file, buildConfig())
    if File.exists?(file) == false
      STDERR.puts "ERROR! Could not create file: #{file}"
      exit(1)
    end
  end

  OptionParser.parse do |parser|
    parser.banner = "Kotatsu - Easy to configure server start page"

    parser.on "-h", "--help", "Show this help" do
      puts parser
      exit
    end

    parser.on "-v", "--version", "Show kotatsu version" do
      puts VERSION
      exit
    end

    parser.on "-mc", "--make-config", "Creates config file without running kotatsu" do
      if File.exists?(CONFIG_FILE) == false
        makeConfig(CONFIG_FILE, CONFIG_DIR)
        exit
      else
        puts "Config already exists"
        exit
      end
    end

    parser.on "list", "Lists all services" do
      if File.exists?(CONFIG_FILE) == true
        conf = JSON.parse(File.read(CONFIG_FILE))
        services = conf["services"].as_a
        i = 0
        while services.size > i
          puts "##{i}: #{services[i][0]} ; #{services[i][1]} ; #{services[i][2]}"
          i+=1
        end
        exit
      else
        STDERR.puts "ERROR! Config file not found: #{CONFIG_FILE}"
        exit(1)
      end
    end

    parser.invalid_option do |flag|
      STDERR.puts "ERROR! Not a valid option: #{flag}"
      STDERR.puts "Use -h or --help for all available options"
      exit(1)
    end
  end

  if File.exists?(CONFIG_FILE) == false
    puts "Could not find config file"
    makeConfig(CONFIG_FILE, CONFIG_DIR)
  end

  webserv = HTTP::Server.new do |context|
    context.response.content_type = "text/plain"
    context.response.print "Running kotatsu #{VERSION}"
  end

  webaddr = webserv.bind_tcp 8080
  puts "Started kotatsu webserver on #{webaddr}"
  webserv.listen

end