require_relative 'helper'

options = {port: 8080}
OptionParser.new do |opts|
  opts.banner = "Usage: server.rb [options]"

  opts.on("-s", "--secure", "HTTPS mode") do |v|
    options[:secure] = v
  end

  opts.on("-p", "--port [Integer]", "listen port") do |v|
    options[:port] = v
  end
end.parse!

puts "Starting server on port #{options[:port]}"
server = TCPServer.new(options[:port])

if options[:secure]
  ctx = OpenSSL::SSL::SSLContext.new
  ctx.cert = OpenSSL::X509::Certificate.new(File.open("keys/mycert.pem"))
  ctx.key = OpenSSL::PKey::RSA.new(File.open("keys/mykey.pem"))
  ctx.npn_protocols = [DRAFT]

  server = OpenSSL::SSL::SSLServer.new(server, ctx)
end

loop do
  sock = server.accept
  puts "New TCP connection!"

  conn = HTTP2::Server.new
  conn.on(:frame) do |bytes|
    # puts "Writing bytes: #{bytes.unpack("H*").first}"
    sock.write bytes
  end
  conn.on(:frame_sent) do |frame|
    puts "Sent frame: #{frame.inspect}"
  end
  conn.on(:frame_received) do |frame|
    puts "Received frame: #{frame.inspect}"
  end

  conn.on(:stream) do |stream|
    log = Logger.new(stream.id)
    req, buffer = {}, ''

    stream.on(:active) { log.info "cliend opened new stream" }
    stream.on(:close)  { log.info "stream closed" }

    stream.on(:headers) do |h|
      req = Hash[*h.flatten]
      log.info "request headers: #{h}"
    end

    stream.on(:data) do |d|
      log.info "payload chunk: <<#{d}>>"
      buffer << d
    end

    stream.on(:half_close) do
      log.info "client closed its end of the stream"

      response = nil
      if req[":method"] == "POST"
        log.info "Received POST request, payload: #{buffer}"
        response = "Hello HTTP 2.0! POST payload: #{buffer}"
      else
        log.info "Received GET request"
        response = "Hello HTTP 2.0! GET request"
      end

      stream.headers({
        ":status" => "200",
        "content-length" => response.bytesize.to_s,
        "content-type" => "text/plain"
      }, end_stream: false)

      # split response into multiple DATA frames
      stream.data(response.slice!(0,5), end_stream: false)
      stream.data(response)
    end
  end

  while !sock.closed? && !sock.eof?
    data = sock.readpartial(1024)
    # puts "Received bytes: #{data.unpack("H*").first}"

    begin
      conn << data
    rescue Exception => e
      puts "Exception: #{e}, #{e.message} - closing socket."
      sock.close
    end
  end
end