/* 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.
 */

#include "uv.h"
#include "task.h"

#include <stdlib.h>
#include <string.h>


static char exepath[1024];
static size_t exepath_size = 1024;
static char* args[3];
static uv_process_options_t options;
static int close_cb_called;
static int exit_cb_called;
static int on_read_cb_called;
static int after_write_cb_called;
static uv_pipe_t in;
static uv_pipe_t out;
static uv_loop_t* loop;
#define OUTPUT_SIZE 1024
static char output[OUTPUT_SIZE];
static int output_used;


static void close_cb(uv_handle_t* handle) {
  close_cb_called++;
}


static void exit_cb(uv_process_t* process,
                    int64_t exit_status,
                    int term_signal) {
  printf("exit_cb\n");
  exit_cb_called++;
  ASSERT(exit_status == 0);
  ASSERT(term_signal == 0);
  uv_close((uv_handle_t*)process, close_cb);
  uv_close((uv_handle_t*)&in, close_cb);
  uv_close((uv_handle_t*)&out, close_cb);
}


static void init_process_options(char* test, uv_exit_cb exit_cb) {
  int r = uv_exepath(exepath, &exepath_size);
  ASSERT(r == 0);
  exepath[exepath_size] = '\0';
  args[0] = exepath;
  args[1] = test;
  args[2] = NULL;
  options.file = exepath;
  options.args = args;
  options.exit_cb = exit_cb;
}


static void on_alloc(uv_handle_t* handle,
                     size_t suggested_size,
                     uv_buf_t* buf) {
  buf->base = output + output_used;
  buf->len = OUTPUT_SIZE - output_used;
}


static void after_write(uv_write_t* req, int status) {
  if (status) {
    fprintf(stderr, "uv_write error: %s\n", uv_strerror(status));
    ASSERT(0);
  }

  /* Free the read/write buffer and the request */
  free(req);

  after_write_cb_called++;
}


static void on_read(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* rdbuf) {
  uv_write_t* req;
  uv_buf_t wrbuf;
  int r;

  ASSERT(nread > 0 || nread == UV_EOF);

  if (nread > 0) {
    output_used += nread;
    if (output_used == 12) {
      ASSERT(memcmp("hello world\n", output, 12) == 0);
      wrbuf = uv_buf_init(output, output_used);
      req = malloc(sizeof(*req));
      r = uv_write(req, (uv_stream_t*)&in, &wrbuf, 1, after_write);
      ASSERT(r == 0);
    }
  }

  on_read_cb_called++;
}


TEST_IMPL(stdio_over_pipes) {
  int r;
  uv_process_t process;
  uv_stdio_container_t stdio[2];
  uv_pipe_t child_pipes[2];

  loop = uv_default_loop();

  init_process_options("stdio_over_pipes_helper", exit_cb);

  uv_pipe_init(loop, &child_pipes[0], UV_PIPE_SPAWN_SAFE|UV_PIPE_READABLE);
  uv_pipe_init(loop, &in, UV_PIPE_WRITABLE);
  r = uv_pipe_link(&child_pipes[0],&in);
  ASSERT( r == 0 );
  
  uv_pipe_init(loop, &out, UV_PIPE_READABLE);
  uv_pipe_init(loop, &child_pipes[1], UV_PIPE_SPAWN_SAFE|UV_PIPE_WRITABLE);
  r = uv_pipe_link(&out,&child_pipes[1]);
  ASSERT( r == 0 );

  options.stdio = stdio;
  options.stdio[0].type = UV_STREAM;
  options.stdio[0].data.stream = (uv_stream_t*)&child_pipes[0];
  options.stdio[1].type = UV_STREAM;
  options.stdio[1].data.stream = (uv_stream_t*)&child_pipes[1];
  options.stdio_count = 2;

  r = uv_spawn(loop, &process, &options);
  ASSERT(r == 0);

  uv_pipe_close_sync(&child_pipes[0]);
  uv_pipe_close_sync(&child_pipes[1]);

  r = uv_read_start((uv_stream_t*) &out, on_alloc, on_read);
  ASSERT(r == 0);

  r = uv_run(uv_default_loop(), UV_RUN_DEFAULT);
  ASSERT(r == 0);

  ASSERT(on_read_cb_called > 1);
  ASSERT(after_write_cb_called == 1);
  ASSERT(exit_cb_called == 1);
  ASSERT(close_cb_called == 3);
  ASSERT(memcmp("hello world\n", output, 12) == 0);
  ASSERT(output_used == 12);

  MAKE_VALGRIND_HAPPY();
  return 0;
}


/* Everything here runs in a child process. */

static int on_pipe_read_called;
static int after_write_called;
static uv_pipe_t stdin_pipe;
static uv_pipe_t stdout_pipe;

static void on_pipe_read(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* buf) {
  ASSERT(nread > 0);
  ASSERT(memcmp("hello world\n", buf->base, nread) == 0);
  on_pipe_read_called++;

  free(buf->base);

  uv_close((uv_handle_t*)&stdin_pipe, close_cb);
  uv_close((uv_handle_t*)&stdout_pipe, close_cb);
}


static void after_pipe_write(uv_write_t* req, int status) {
  ASSERT(status == 0);
  after_write_called++;
}


static void on_read_alloc(uv_handle_t* handle,
                          size_t suggested_size,
                          uv_buf_t* buf) {
  buf->base = malloc(suggested_size);
  buf->len = suggested_size;
}


int stdio_over_pipes_helper(void) {
  /* Write several buffers to test that the write order is preserved. */
  char* buffers[] = {
    "he",
    "ll",
    "o ",
    "wo",
    "rl",
    "d",
    "\n"
  };

  uv_write_t write_req[ARRAY_SIZE(buffers)];
  uv_buf_t buf[ARRAY_SIZE(buffers)];
  unsigned int i;
  int r;
  uv_loop_t* loop = uv_default_loop();

  ASSERT(UV_NAMED_PIPE == uv_guess_handle(0));
  ASSERT(UV_NAMED_PIPE == uv_guess_handle(1));

  r = uv_pipe_init(loop, &stdin_pipe, UV_PIPE_READABLE);
  ASSERT(r == 0);
  r = uv_pipe_init(loop, &stdout_pipe, UV_PIPE_WRITABLE);
  ASSERT(r == 0);

  uv_pipe_open(&stdin_pipe, 0);
  uv_pipe_open(&stdout_pipe, 1);

  /* Unref both stdio handles to make sure that all writes complete. */
  uv_unref((uv_handle_t*)&stdin_pipe);
  uv_unref((uv_handle_t*)&stdout_pipe);

  for (i = 0; i < ARRAY_SIZE(buffers); i++) {
    buf[i] = uv_buf_init((char*)buffers[i], strlen(buffers[i]));
  }

  for (i = 0; i < ARRAY_SIZE(buffers); i++) {
    r = uv_write(&write_req[i], (uv_stream_t*)&stdout_pipe, &buf[i], 1,
      after_pipe_write);
    ASSERT(r == 0);
  }

  uv_run(loop, UV_RUN_DEFAULT);

  ASSERT(after_write_called == 7);
  ASSERT(on_pipe_read_called == 0);
  ASSERT(close_cb_called == 0);

  uv_ref((uv_handle_t*)&stdout_pipe);
  uv_ref((uv_handle_t*)&stdin_pipe);

  r = uv_read_start((uv_stream_t*)&stdin_pipe, on_read_alloc, on_pipe_read);
  ASSERT(r == 0);

  uv_run(loop, UV_RUN_DEFAULT);

  ASSERT(after_write_called == 7);
  ASSERT(on_pipe_read_called == 1);
  ASSERT(close_cb_called == 2);

  MAKE_VALGRIND_HAPPY();
  return 0;
}
