/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 *
 * 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.
 */

/* Expose glibc-specific EAI_* error codes. Needs to be defined before we
 * include any headers.
 */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif

#include "uv.h"
#include "uv-common.h"

#include <stdio.h>
#include <assert.h>
#include <stddef.h> /* NULL */
#include <stdlib.h> /* malloc */
#include <string.h> /* memset */

#if defined(UV_PLATFORM_HAS_IP6_LINK_LOCAL_ADDRESS) && !defined(_WIN32)
# include <net/if.h> /* if_nametoindex */
#endif

/* EAI_* constants. */
#if !defined(_WIN32)
# include <sys/types.h>
# include <sys/socket.h>
# include <netdb.h>
#endif

#define XX(uc, lc) case UV_##uc: return sizeof(uv_##lc##_t);

size_t uv_handle_size(uv_handle_type type) {
  switch (type) {
    UV_HANDLE_TYPE_MAP(XX)
    default:
      return -1;
  }
}

size_t uv_req_size(uv_req_type type) {
  switch(type) {
    UV_REQ_TYPE_MAP(XX)
    default:
      return -1;
  }
}

#undef XX


uv_buf_t uv_buf_init(char* base, unsigned int len) {
  uv_buf_t buf;
  buf.base = base;
  buf.len = len;
  return buf;
}


#define UV_ERR_NAME_GEN(name, _) case UV_ ## name: return #name;
const char* uv_err_name(int err) {
  switch (err) {
    UV_ERRNO_MAP(UV_ERR_NAME_GEN)
    default:
      assert(0);
      return NULL;
  }
}
#undef UV_ERR_NAME_GEN


#define UV_STRERROR_GEN(name, msg) case UV_ ## name: return msg;
const char* uv_strerror(int err) {
  switch (err) {
    UV_ERRNO_MAP(UV_STRERROR_GEN)
    default:
      return "Unknown system error";
  }
}
#undef UV_STRERROR_GEN


int uv_ip4_addr(const char* ip, int port, struct sockaddr_in* addr) {
  memset(addr, 0, sizeof(*addr));
  addr->sin_family = AF_INET;
  addr->sin_port = htons(port);
  return uv_inet_pton(AF_INET, ip, &(addr->sin_addr.s_addr));
}


int uv_ip6_addr(const char* ip, int port, struct sockaddr_in6* addr) {
#if defined(UV_PLATFORM_HAS_IP6_LINK_LOCAL_ADDRESS)
  char address_part[40];
  size_t address_part_size;
  const char* zone_index;
#endif

  memset(addr, 0, sizeof(*addr));
  addr->sin6_family = AF_INET6;
  addr->sin6_port = htons(port);

#if defined(UV_PLATFORM_HAS_IP6_LINK_LOCAL_ADDRESS)
  zone_index = strchr(ip, '%');
  if (zone_index != NULL) {
    address_part_size = zone_index - ip;
    if (address_part_size >= sizeof(address_part))
      address_part_size = sizeof(address_part) - 1;

    memcpy(address_part, ip, address_part_size);
    address_part[address_part_size] = '\0';
    ip = address_part;

    zone_index++; /* skip '%' */
    /* NOTE: unknown interface (id=0) is silently ignored */
#ifdef _WIN32
    addr->sin6_scope_id = atoi(zone_index);
#else
    addr->sin6_scope_id = if_nametoindex(zone_index);
#endif
  }
#endif

  return uv_inet_pton(AF_INET6, ip, &addr->sin6_addr);
}


int uv_ip4_name(struct sockaddr_in* src, char* dst, size_t size) {
  return uv_inet_ntop(AF_INET, &src->sin_addr, dst, size);
}


int uv_ip6_name(struct sockaddr_in6* src, char* dst, size_t size) {
  return uv_inet_ntop(AF_INET6, &src->sin6_addr, dst, size);
}


int uv_tcp_bind(uv_tcp_t* handle,
                const struct sockaddr* addr,
                unsigned int flags) {
  unsigned int addrlen;

  if (handle->type != UV_TCP)
    return UV_EINVAL;

  if (addr->sa_family == AF_INET)
    addrlen = sizeof(struct sockaddr_in);
  else if (addr->sa_family == AF_INET6)
    addrlen = sizeof(struct sockaddr_in6);
  else
    return UV_EINVAL;

  return uv__tcp_bind(handle, addr, addrlen, flags);
}


int uv_udp_bind(uv_udp_t* handle,
                const struct sockaddr* addr,
                unsigned int flags) {
  unsigned int addrlen;

  if (handle->type != UV_UDP)
    return UV_EINVAL;

  if (addr->sa_family == AF_INET)
    addrlen = sizeof(struct sockaddr_in);
  else if (addr->sa_family == AF_INET6)
    addrlen = sizeof(struct sockaddr_in6);
  else
    return UV_EINVAL;

  return uv__udp_bind(handle, addr, addrlen, flags);
}


int uv_tcp_connect(uv_connect_t* req,
                   uv_tcp_t* handle,
                   const struct sockaddr* addr,
                   uv_connect_cb cb) {
  unsigned int addrlen;

  if (handle->type != UV_TCP)
    return UV_EINVAL;

  if (addr->sa_family == AF_INET)
    addrlen = sizeof(struct sockaddr_in);
  else if (addr->sa_family == AF_INET6)
    addrlen = sizeof(struct sockaddr_in6);
  else
    return UV_EINVAL;

  return uv__tcp_connect(req, handle, addr, addrlen, cb);
}


int uv_udp_send(uv_udp_send_t* req,
                uv_udp_t* handle,
                const uv_buf_t bufs[],
                unsigned int nbufs,
                const struct sockaddr* addr,
                uv_udp_send_cb send_cb) {
  unsigned int addrlen;

  if (handle->type != UV_UDP)
    return UV_EINVAL;

  if (addr->sa_family == AF_INET)
    addrlen = sizeof(struct sockaddr_in);
  else if (addr->sa_family == AF_INET6)
    addrlen = sizeof(struct sockaddr_in6);
  else
    return UV_EINVAL;

  return uv__udp_send(req, handle, bufs, nbufs, addr, addrlen, send_cb);
}


int uv_udp_recv_start(uv_udp_t* handle,
                      uv_alloc_cb alloc_cb,
                      uv_udp_recv_cb recv_cb) {
  if (handle->type != UV_UDP || alloc_cb == NULL || recv_cb == NULL)
    return UV_EINVAL;
  else
    return uv__udp_recv_start(handle, alloc_cb, recv_cb);
}


int uv_udp_recv_stop(uv_udp_t* handle) {
  if (handle->type != UV_UDP)
    return UV_EINVAL;
  else
    return uv__udp_recv_stop(handle);
}


struct thread_ctx {
  void (*entry)(void* arg);
  void* arg;
};


#ifdef _WIN32
static UINT __stdcall uv__thread_start(void* arg)
#else
static void* uv__thread_start(void *arg)
#endif
{
  struct thread_ctx *ctx_p;
  struct thread_ctx ctx;

  ctx_p = arg;
  ctx = *ctx_p;
  free(ctx_p);
  ctx.entry(ctx.arg);

  return 0;
}


int uv_thread_create(uv_thread_t *tid, void (*entry)(void *arg), void *arg) {
  struct thread_ctx* ctx;
  int err;

  ctx = malloc(sizeof(*ctx));
  if (ctx == NULL)
    return UV_ENOMEM;

  ctx->entry = entry;
  ctx->arg = arg;

#ifdef _WIN32
  *tid = (HANDLE) _beginthreadex(NULL, 0, uv__thread_start, ctx, 0, NULL);
  err = *tid ? 0 : errno;
#else
  err = pthread_create(tid, NULL, uv__thread_start, ctx);
#endif

  if (err)
    free(ctx);

  return err ? -1 : 0;
}


unsigned long uv_thread_self(void) {
#ifdef _WIN32
  return (unsigned long) GetCurrentThreadId();
#else
  return (unsigned long) pthread_self();
#endif
}


void uv_walk(uv_loop_t* loop, uv_walk_cb walk_cb, void* arg) {
  QUEUE* q;
  uv_handle_t* h;

  QUEUE_FOREACH(q, &loop->handle_queue) {
    h = QUEUE_DATA(q, uv_handle_t, handle_queue);
    if (h->flags & UV__HANDLE_INTERNAL) continue;
    walk_cb(h, arg);
  }
}


#ifndef NDEBUG
static void uv__print_handles(uv_loop_t* loop, int only_active) {
  const char* type;
  QUEUE* q;
  uv_handle_t* h;

  if (loop == NULL)
    loop = uv_default_loop();

  QUEUE_FOREACH(q, &loop->handle_queue) {
    h = QUEUE_DATA(q, uv_handle_t, handle_queue);

    if (only_active && !uv__is_active(h))
      continue;

    switch (h->type) {
#define X(uc, lc) case UV_##uc: type = #lc; break;
      UV_HANDLE_TYPE_MAP(X)
#undef X
      default: type = "<unknown>";
    }

    fprintf(stderr,
            "[%c%c%c] %-8s %p\n",
            "R-"[!(h->flags & UV__HANDLE_REF)],
            "A-"[!(h->flags & UV__HANDLE_ACTIVE)],
            "I-"[!(h->flags & UV__HANDLE_INTERNAL)],
            type,
            (void*)h);
  }
}


void uv_print_all_handles(uv_loop_t* loop) {
  uv__print_handles(loop, 0);
}


void uv_print_active_handles(uv_loop_t* loop) {
  uv__print_handles(loop, 1);
}
#endif


void uv_ref(uv_handle_t* handle) {
  uv__handle_ref(handle);
}


void uv_unref(uv_handle_t* handle) {
  uv__handle_unref(handle);
}


int uv_has_ref(const uv_handle_t* handle) {
  return uv__has_ref(handle);
}


void uv_stop(uv_loop_t* loop) {
  loop->stop_flag = 1;
}


uint64_t uv_now(uv_loop_t* loop) {
  return loop->time;
}


int uv__getaddrinfo_translate_error(int sys_err) {
  switch (sys_err) {
  case 0: return 0;
#if defined(EAI_ADDRFAMILY)
  case EAI_ADDRFAMILY: return UV_EAI_ADDRFAMILY;
#endif
#if defined(EAI_AGAIN)
  case EAI_AGAIN: return UV_EAI_AGAIN;
#endif
#if defined(EAI_BADFLAGS)
  case EAI_BADFLAGS: return UV_EAI_BADFLAGS;
#endif
#if defined(EAI_BADHINTS)
  case EAI_BADHINTS: return UV_EAI_BADHINTS;
#endif
#if defined(EAI_CANCELED)
  case EAI_CANCELED: return UV_EAI_CANCELED;
#endif
#if defined(EAI_FAIL)
  case EAI_FAIL: return UV_EAI_FAIL;
#endif
#if defined(EAI_FAMILY)
  case EAI_FAMILY: return UV_EAI_FAMILY;
#endif
#if defined(EAI_MEMORY)
  case EAI_MEMORY: return UV_EAI_MEMORY;
#endif
#if defined(EAI_NODATA)
  case EAI_NODATA: return UV_EAI_NODATA;
#endif
#if defined(EAI_NONAME)
# if !defined(EAI_NODATA) || EAI_NODATA != EAI_NONAME
  case EAI_NONAME: return UV_EAI_NONAME;
# endif
#endif
#if defined(EAI_OVERFLOW)
  case EAI_OVERFLOW: return UV_EAI_OVERFLOW;
#endif
#if defined(EAI_PROTOCOL)
  case EAI_PROTOCOL: return UV_EAI_PROTOCOL;
#endif
#if defined(EAI_SERVICE)
  case EAI_SERVICE: return UV_EAI_SERVICE;
#endif
#if defined(EAI_SOCKTYPE)
  case EAI_SOCKTYPE: return UV_EAI_SOCKTYPE;
#endif
#if defined(EAI_SYSTEM)
  case EAI_SYSTEM: return UV_EAI_SYSTEM;
#endif
  }
  assert(!"unknown EAI_* error code");
  abort();
  return 0;  /* Pacify compiler. */
}

int uv_fs_event_getpath(uv_fs_event_t* handle, char* buf, size_t* len) {
  size_t required_len;

  if (!uv__is_active(handle)) {
    *len = 0;
    return UV_EINVAL;
  }

  required_len = strlen(handle->path) + 1;
  if (required_len > *len) {
    *len = required_len;
    return UV_ENOBUFS;
  }

  memcpy(buf, handle->path, required_len);
  *len = required_len;

  return 0;
}