/*

 * nghttp2 - HTTP/2 C Library

 *

 * Copyright (c) 2012 Tatsuhiro Tsujikawa

 *

 * Permission is hereby granted, free of charge, to any person obtaining

 * a copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sublicense, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

#include "nghttp2_stream.h"

#include <assert.h>

#include "nghttp2_session.h"

#include "nghttp2_helper.h"

#include "nghttp2_debug.h"

#include "nghttp2_frame.h"

void nghttp2_stream_init(nghttp2_stream *stream, int32_t stream_id,

                         uint8_t flags, nghttp2_stream_state initial_state,

                         int32_t remote_initial_window_size,

                         int32_t local_initial_window_size,

                         void *stream_user_data) {

  stream->stream_id = stream_id;

  stream->flags = flags;

  stream->state = initial_state;

  stream->shut_flags = NGHTTP2_SHUT_NONE;

  stream->stream_user_data = stream_user_data;

  stream->item = NULL;

  stream->remote_window_size = remote_initial_window_size;

  stream->local_window_size = local_initial_window_size;

  stream->recv_window_size = 0;

  stream->consumed_size = 0;

  stream->recv_reduction = 0;

  stream->window_update_queued = 0;

  stream->closed_next = NULL;

  stream->http_flags = NGHTTP2_HTTP_FLAG_NONE;

  stream->content_length = -1;

  stream->recv_content_length = 0;

  stream->status_code = -1;

  stream->queued = 0;

  stream->cycle = 0;

  stream->pending_penalty = 0;

  stream->seq = 0;

  stream->last_writelen = 0;

  stream->extpri = stream->http_extpri = NGHTTP2_EXTPRI_DEFAULT_URGENCY;

}

void nghttp2_stream_free(nghttp2_stream *stream) { (void)stream; }

void nghttp2_stream_shutdown(nghttp2_stream *stream, nghttp2_shut_flag flag) {

  stream->shut_flags = (uint8_t)(stream->shut_flags | flag);

}

void nghttp2_stream_attach_item(nghttp2_stream *stream,

                                nghttp2_outbound_item *item) {

  assert((stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL) == 0);

  assert(stream->item == NULL);

  DEBUGF("stream: stream=%d attach item=%p\n", stream->stream_id, item);

  stream->item = item;

}

void nghttp2_stream_detach_item(nghttp2_stream *stream) {

  DEBUGF("stream: stream=%d detach item=%p\n", stream->stream_id, stream->item);

  stream->item = NULL;

  stream->flags = (uint8_t)(stream->flags & ~NGHTTP2_STREAM_FLAG_DEFERRED_ALL);

}

void nghttp2_stream_defer_item(nghttp2_stream *stream, uint8_t flags) {

  assert(stream->item);

  DEBUGF("stream: stream=%d defer item=%p cause=%02x\n", stream->stream_id,

         stream->item, flags);

  stream->flags |= flags;

}

void nghttp2_stream_resume_deferred_item(nghttp2_stream *stream,

                                         uint8_t flags) {

  assert(stream->item);

  DEBUGF("stream: stream=%d resume item=%p flags=%02x\n", stream->stream_id,

         stream->item, flags);

  stream->flags = (uint8_t)(stream->flags & ~flags);

}

int nghttp2_stream_check_deferred_item(nghttp2_stream *stream) {

  return stream->item && (stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL);

}

int nghttp2_stream_check_deferred_by_flow_control(nghttp2_stream *stream) {

  return stream->item &&

         (stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL);

}

static int update_initial_window_size(int32_t *window_size_ptr,

                                      int32_t new_initial_window_size,

                                      int32_t old_initial_window_size) {

  int64_t new_window_size = (int64_t)(*window_size_ptr) +

                            new_initial_window_size - old_initial_window_size;

  if (INT32_MIN > new_window_size ||

      new_window_size > NGHTTP2_MAX_WINDOW_SIZE) {

    return -1;

  }

  *window_size_ptr = (int32_t)new_window_size;

  return 0;

}

int nghttp2_stream_update_remote_initial_window_size(

  nghttp2_stream *stream, int32_t new_initial_window_size,

  int32_t old_initial_window_size) {

  return update_initial_window_size(&stream->remote_window_size,

                                    new_initial_window_size,

                                    old_initial_window_size);

}

int nghttp2_stream_update_local_initial_window_size(

  nghttp2_stream *stream, int32_t new_initial_window_size,

  int32_t old_initial_window_size) {

  return update_initial_window_size(&stream->local_window_size,

                                    new_initial_window_size,

                                    old_initial_window_size);

}

void nghttp2_stream_promise_fulfilled(nghttp2_stream *stream) {

  stream->state = NGHTTP2_STREAM_OPENED;

  stream->flags = (uint8_t)(stream->flags & ~NGHTTP2_STREAM_FLAG_PUSH);

}

nghttp2_stream_proto_state nghttp2_stream_get_state(nghttp2_stream *stream) {

  if (stream == &nghttp2_stream_root) {

    return NGHTTP2_STREAM_STATE_IDLE;

  }

  if (stream->flags & NGHTTP2_STREAM_FLAG_CLOSED) {

    return NGHTTP2_STREAM_STATE_CLOSED;

  }

  if (stream->flags & NGHTTP2_STREAM_FLAG_PUSH) {

    if (stream->shut_flags & NGHTTP2_SHUT_RD) {

      return NGHTTP2_STREAM_STATE_RESERVED_LOCAL;

    }

    if (stream->shut_flags & NGHTTP2_SHUT_WR) {

      return NGHTTP2_STREAM_STATE_RESERVED_REMOTE;

    }

  }

  if (stream->shut_flags & NGHTTP2_SHUT_RD) {

    return NGHTTP2_STREAM_STATE_HALF_CLOSED_REMOTE;

  }

  if (stream->shut_flags & NGHTTP2_SHUT_WR) {

    return NGHTTP2_STREAM_STATE_HALF_CLOSED_LOCAL;

  }

  if (stream->state == NGHTTP2_STREAM_IDLE) {

    return NGHTTP2_STREAM_STATE_IDLE;

  }

  return NGHTTP2_STREAM_STATE_OPEN;

}

nghttp2_stream *nghttp2_stream_get_parent(nghttp2_stream *stream) {

  (void)stream;

  return NULL;

}

nghttp2_stream *nghttp2_stream_get_next_sibling(nghttp2_stream *stream) {

  (void)stream;

  return NULL;

}

nghttp2_stream *nghttp2_stream_get_previous_sibling(nghttp2_stream *stream) {

  (void)stream;

  return NULL;

}

nghttp2_stream *nghttp2_stream_get_first_child(nghttp2_stream *stream) {

  (void)stream;

  return NULL;

}

int32_t nghttp2_stream_get_weight(nghttp2_stream *stream) {

  (void)stream;

  return NGHTTP2_DEFAULT_WEIGHT;

}

int32_t nghttp2_stream_get_sum_dependency_weight(nghttp2_stream *stream) {

  (void)stream;

  return 0;

}

int32_t nghttp2_stream_get_stream_id(nghttp2_stream *stream) {

  return stream->stream_id;

}