/* vim:expandtab:ts=2 sw=2:
*/
/*  Grafx2 - The Ultimate 256-color bitmap paint program

    Copyright 2018-2020 Thomas Bernard
    Copyright 2011 Pawel Góralski
    Copyright 2009 Petter Lindquist
    Copyright 2008 Yves Rizoud
    Copyright 2008 Franck Charlet
    Copyright 2007-2011 Adrien Destugues
    Copyright 1996-2001 Sunset Design (Guillaume Dorme & Karl Maritaud)

    Grafx2 is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; version 2
    of the License.

    Grafx2 is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Grafx2; if not, see <http://www.gnu.org/licenses/>
*/
///@file testio.c
/// Unit tests.
///

#include <stdlib.h>
#include <string.h>
#include "tests.h"
#include "../struct.h"
#include "../io.h"
#include "../realpath.h"
#include "../gfx2mem.h"
#include "../gfx2log.h"

// random()/srandom() not available with mingw32
#if defined(WIN32)
#define random (long)rand
#endif

int Test_Read_Write_byte(char * errmsg)
{
  char path[256];
  FILE * f;
  byte b = 0;

  snprintf(path, sizeof(path), "%s%sbyte.bin", tmpdir, PATH_SEPARATOR);
  f = fopen(path, "w+b");
  if (f == NULL)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error opening %s", path);
    return 0;
  }
  if (!Write_byte(f, 42))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error writing");
    fclose(f);
    return 0;
  }
  rewind(f);
  if (!Read_byte(f, &b))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error reading");
    fclose(f);
    return 0;
  }
  if (b != 42)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "Byte value mismatch 0x%02x != 0x%02x", b, 42);
    fclose(f);
    return 0;
  }
  fclose(f);
  Remove_path(path);
  return 1;
}

int Test_Read_Write_word(char * errmsg)
{
  char path[256];
  FILE * f;
  word w1 = 0, w2 = 0;
  byte b = 0;

  snprintf(path, sizeof(path), "%s%sword.bin", tmpdir, PATH_SEPARATOR);
  f = fopen(path, "w+b");
  if (f == NULL)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error opening %s", path);
    return 0;
  }
  // write bytes 12 34 56 78 90
  if (!Write_word_le(f, 0x3412) || !Write_word_be(f, 0x5678) || !Write_byte(f, 0x90))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error writing");
    fclose(f);
    return 0;
  }
  rewind(f);
  if (!Read_byte(f, &b) || !Read_word_be(f, &w1) || !Read_word_le(f, &w2))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error reading");
    fclose(f);
    return 0;
  }
  if ((b != 0x12) || (w1 != 0x3456) || (w2 != 0x9078))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "word values mismatch b=0x%02x w1=0x%04x w2=0x%04x", b, w1, w2);
    fclose(f);
    return 0;
  }
  fclose(f);
  Remove_path(path);
  return 1;
}

int Test_Read_Write_dword(char * errmsg)
{
  char path[256];
  FILE * f;
  dword dw1 = 0, dw2 = 0;
  byte b = 0;

  snprintf(path, sizeof(path), "%s%sdword.bin", tmpdir, PATH_SEPARATOR);
  f = fopen(path, "w+b");
  if (f == NULL)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error opening %s", path);
    return 0;
  }
  // write bytes 01 02 03 04 05 06 07 08 09
  if (!Write_dword_le(f, 0x04030201) || !Write_dword_be(f, 0x05060708) || !Write_byte(f, 9))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error writing");
    fclose(f);
    return 0;
  }
  rewind(f);
  if (!Read_byte(f, &b) || !Read_dword_be(f, &dw1) || !Read_dword_le(f, &dw2))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error reading");
    fclose(f);
    return 0;
  }
  if ((b != 0x1) || (dw1 != 0x02030405) || (dw2 != 0x09080706))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "word values mismatch");
    fclose(f);
    return 0;
  }
  fclose(f);
  Remove_path(path);
  return 1;
}

int Test_Read_Write_bytes(char * errmsg)
{
  char path[256];
  FILE * f;
  unsigned long len;
  byte * buffer;
  byte b;

  snprintf(path, sizeof(path), "%s%sbytes.bin", tmpdir, PATH_SEPARATOR);
  f = fopen(path, "w+b");
  if (f == NULL)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error opening %s", path);
    return 0;
  }
  b = (byte)random();
  len = 1000 + (random() & 0x3ff);
  buffer = GFX2_malloc(len);
  if (buffer == NULL)
  {
    fclose(f);
    return 0;
  }
  memset(buffer, b, len);
  GFX2_Log(GFX2_DEBUG, "Writing %lu bytes 0x%02x\n", len, (int)b);
  // write bytes
  if (!Write_bytes(f, buffer, len))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error writing");
    free(buffer);
    fclose(f);
    return 0;
  }
  rewind(f);
  memset(buffer, 0, len);
  if (!Read_bytes(f, buffer, len))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "error reading");
    free(buffer);
    fclose(f);
    return 0;
  }
  if (!GFX2_is_mem_filled_with(buffer, b, len))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "byte values mismatch");
    free(buffer);
    fclose(f);
    return 0;
  }
  free(buffer);
  if (File_length_file(f) != len)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "File_length_file() returned %lu (should be %lu)",
             File_length_file(f), len);
    fclose(f);
    return 0;
  }
  fclose(f);
  if (File_length(path) != len)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "File_length() returned %lu (should be %lu)",
             File_length(path), len);
    return 0;
  }
  Remove_path(path);
  return 1;
}

/**
 * data structure for For_each_directory_entry() callback
 */
struct dir_callback_data
{
  char * filename;
  int result;
};

/**
 * callback for For_each_directory_entry()
 */
static void directory_callback(void * pdata, const char * filename, const word * unicode_filename, byte is_file, byte is_directory, byte is_hidden)
{
  struct dir_callback_data * data = (struct dir_callback_data *)pdata;

  GFX2_Log(GFX2_DEBUG, "%-13s %c%c%c  %p\n", filename,
           is_file ? 'f' : '-',
           is_directory ? 'd' : '-',
           is_hidden ? 'h' : '-',
           unicode_filename);
  if (0 == strcmp(filename, data->filename) && is_file && !is_directory)
    data->result = 1;
}

int Test_File_exists(char * errmsg)
{
  struct dir_callback_data data;
  char path[256];
  FILE * f;

  if (!Directory_exists(tmpdir))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "Directory_exists(\"%s\") FALSE", tmpdir);
    return 0;
  }
  snprintf(path, sizeof(path), "%s%sX%07x.tmp", tmpdir, PATH_SEPARATOR, (unsigned)(random() & 0x0fffffff));
  if (File_exists(path))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "File_exists(\"%s\") TRUE before creation", path);
    return 0;
  }
  f = fopen(path, "w");
  if (f == NULL)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "fopen(\"%s\", \"wb\") FAILED", path);
    return 0;
  }
  fputs("test\n", f);
  fclose(f);
  if (!File_exists(path))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "File_exists(\"%s\") FALSE after create", path);
    return 0;
  }
  data.result = 0;
  data.filename = Extract_filename(NULL, path);
  if (data.filename == NULL)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "Extract_filename(NULL, \"%s\") FAILED", path);
    return 0;
  }
  GFX2_Log(GFX2_DEBUG, "Listing directory with For_each_directory_entry(\"%s\"):\n", tmpdir);
  For_each_directory_entry(tmpdir, &data, directory_callback);
  if (!data.result)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "Failed to find file \"%s\" in directory \"%s\"", data.filename, tmpdir);
    free(data.filename);
    return 0;
  }
  free(data.filename);
  Remove_path(path);
  if (File_exists(path))
  {
    snprintf(errmsg, ERRMSG_LENGTH, "File_exists(\"%s\") TRUE after Remove", path);
    return 0;
  }
  return 1;
}

int Test_Realpath(char * errmsg)
{
  char * path;

  path = Realpath(tmpdir, NULL);
  if (path == NULL)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "Realpath(\"%s\") returned NULL", tmpdir);
    return 0;
  }
  GFX2_Log(GFX2_DEBUG, "Realpath(\"%s\") returned \"%s\"\n", tmpdir, path);
  free(path);
  return 1;
}

int Test_Calculate_relative_path(char * errmsg)
{
  char path[256];
  char * rel;
  const char * expected;

  snprintf(path, sizeof(path), "%s%ssubdir", tmpdir, PATH_SEPARATOR);
  GFX2_Log(GFX2_DEBUG, "path : %s\n", path);
  rel = Calculate_relative_path(tmpdir, path);
  if (rel == NULL)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "Calculate_relative_path() returned NULL");
    return 0;
  }
  GFX2_Log(GFX2_DEBUG, "%s\n", rel);
  expected = "." PATH_SEPARATOR "subdir";
  if (0 != strcmp(rel, expected))
  {
    snprintf(errmsg, ERRMSG_LENGTH,
             "Calculate_relative_path() returned %s (%s expected)",
             rel, expected);
    free(rel);
    return 0;
  }
  free(rel);
  rel = Calculate_relative_path(path, tmpdir);
  if (rel == NULL)
  {
    snprintf(errmsg, ERRMSG_LENGTH, "Calculate_relative_path() returned NULL");
    return 0;
  }
  GFX2_Log(GFX2_DEBUG, "%s\n", rel);
  expected = ".." PATH_SEPARATOR ".." PATH_SEPARATOR;
  if (0 != strncmp(rel, expected, strlen(expected)))
  {
    snprintf(errmsg, ERRMSG_LENGTH,
             "Calculate_relative_path() returned %s (should start with %s)",
             rel, expected);
    free(rel);
    return 0;
  }
  free(rel);
  return 1;
}