(*----------------------------------------------------------------------------
 *  Copyright (c) 2018 Inhabited Type LLC.
 *  Copyright (c) 2019-2020 Antonio N. Monteiro.
 *
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *  3. Neither the name of the author nor the names of his contributors
 *     may be used to endorse or promote products derived from this software
 *     without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
 *  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 *  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 *  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 *---------------------------------------------------------------------------*)

open Async
open H2

module Server = struct
  type 'a socket = ([ `Active ], ([< Socket.Address.t ] as 'a)) Socket.t

  let create_connection_handler
      ?(config = H2.Config.default)
      ~request_handler
      ~error_handler
      client_addr
      socket
    =
    let connection =
      H2.Server_connection.create
        ~config
        ~error_handler:(error_handler client_addr)
        (request_handler client_addr)
    in
    Gluten_async.Server.create_connection_handler
      ~read_buffer_size:config.read_buffer_size
      ~protocol:(module H2.Server_connection)
      connection
      client_addr
      socket

  module SSL = struct
    let create_connection_handler
        ?(config = H2.Config.default)
        ~request_handler
        ~error_handler
        client_addr
        socket
      =
      let connection =
        H2.Server_connection.create
          ~config
          ~error_handler:(error_handler client_addr)
          (request_handler client_addr)
      in
      Gluten_async.Server.SSL.create_connection_handler
        ~read_buffer_size:config.read_buffer_size
        ~protocol:(module H2.Server_connection)
        connection
        client_addr
        socket

    let create_connection_handler_with_default
        ~certfile
        ~keyfile
        ?config
        ~request_handler
        ~error_handler
      =
      let make_ssl_server =
        Gluten_async.Server.SSL.create_default
          ~alpn_protocols:[ "h2" ]
          ~certfile
          ~keyfile
      in
      fun client_addr socket ->
        make_ssl_server client_addr socket >>= fun ssl_server ->
        create_connection_handler
          ?config
          ~request_handler
          ~error_handler
          client_addr
          ssl_server
  end
end

module Client = struct
  module Client_runtime = Gluten_async.Client

  type 'a socket = 'a Client_runtime.socket
  type 'a runtime = 'a Client_runtime.t

  type 'a t =
    { connection : Client_connection.t
    ; runtime : 'a runtime
    }

  let create_connection
      ?(config = Config.default)
      ?push_handler
      ~error_handler
      socket
    =
    let connection =
      Client_connection.create ~config ?push_handler ~error_handler ()
    in
    Client_runtime.create
      ~read_buffer_size:config.read_buffer_size
      ~protocol:(module Client_connection)
      connection
      socket
    >>| fun runtime -> { runtime; connection }

  let request t = Client_connection.request t.connection
  let ping t = Client_connection.ping t.connection
  let shutdown t = Client_runtime.shutdown t.runtime
  let is_closed t = Client_runtime.is_closed t.runtime

  module SSL = struct
    module Client_runtime = Gluten_async.Client.SSL

    type 'a socket = 'a Client_runtime.socket
    type 'a runtime = 'a Client_runtime.t

    type 'a t =
      { connection : Client_connection.t
      ; runtime : 'a runtime
      }

    let create_connection
        ?(config = Config.default)
        ?push_handler
        ~error_handler
        socket
      =
      let connection =
        Client_connection.create ~config ?push_handler ~error_handler ()
      in
      Client_runtime.create
        ~read_buffer_size:config.read_buffer_size
        ~protocol:(module Client_connection)
        connection
        socket
      >>| fun runtime -> { runtime; connection }

    let create_connection_with_default
        ?(config = Config.default)
        ?push_handler
        ~error_handler
        socket
      =
      Client_runtime.create_default ~alpn_protocols:[ "http/1.1" ] socket
      >>= fun ssl_client ->
      create_connection ~config ?push_handler ~error_handler ssl_client

    let request t = Client_connection.request t.connection
    let ping t = Client_connection.ping t.connection
    let shutdown t = Client_runtime.shutdown t.runtime
    let is_closed t = Client_runtime.is_closed t.runtime
  end

  module TLS = struct
    module Client_runtime = Gluten_async.Client.TLS

    type 'a socket = 'a Client_runtime.socket
    type 'a runtime = 'a Client_runtime.t

    type 'a t =
      { connection : Client_connection.t
      ; runtime : 'a runtime
      }

    let create_connection
        ?(config = Config.default)
        ?push_handler
        ~error_handler
        socket
      =
      let connection =
        Client_connection.create ~config ?push_handler ~error_handler ()
      in
      Client_runtime.create
        ~read_buffer_size:config.read_buffer_size
        ~protocol:(module Client_connection)
        connection
        socket
      >>| fun runtime -> { runtime; connection }

    let create_connection_with_default
        ?(config = Config.default)
        ?push_handler
        ~error_handler
        socket
        where_to_connect
      =
      Client_runtime.create_default
        ~alpn_protocols:[ "http/1.1" ]
        socket
        where_to_connect
      >>= fun tls_client ->
      create_connection ~config ?push_handler ~error_handler tls_client

    let request t = Client_connection.request t.connection
    let ping t = Client_connection.ping t.connection
    let shutdown t = Client_runtime.shutdown t.runtime
    let is_closed t = Client_runtime.is_closed t.runtime
  end
end