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/**
 * Copyright (C) ARM Limited 2010-2013. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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

#if defined(WIN32)
#include <windows.h>
#elif defined(__linux__)
#include <unistd.h>
#elif defined(DARWIN)
#include <mach-o/dyld.h>
#endif

#include "OlyUtility.h"

OlyUtility* util = NULL;

bool OlyUtility::stringToBool(const char* string, bool defValue) {
  char value[32];

  if (string == NULL) {
    return defValue;
  }

  strncpy(value, string, sizeof(value));
  if (value[0] == 0) {
    return defValue;
  }
  value[sizeof(value) - 1] = 0; // strncpy does not guarantee a null-terminated string

  // Convert to lowercase
  int i = 0;
  while (value[i]) {
    value[i] = tolower(value[i]);
    i++;
  }

  if (strcmp(value, "true") == 0 || strcmp(value, "yes") == 0 || strcmp(value, "1") == 0 || strcmp(value, "on") == 0) {
    return true;
  } else if (strcmp(value, "false") == 0 || strcmp(value, "no") == 0 || strcmp(value, "0") == 0 || strcmp(value, "off") == 0) {
    return false;
  } else {
    return defValue;
  }
}

void OlyUtility::stringToLower(char* string) {
  if (string == NULL) {
    return;
  }

  while (*string) {
    *string = tolower(*string);
    string++;
  }
}

// Modifies fullpath with the path part including the trailing path separator
int OlyUtility::getApplicationFullPath(char* fullpath, int sizeOfPath) {
  memset(fullpath, 0, sizeOfPath);
#if defined(WIN32)
  int length = GetModuleFileName(NULL, fullpath, sizeOfPath);
#elif defined(__linux__)
  int length = readlink("/proc/self/exe", fullpath, sizeOfPath);
#elif defined(DARWIN)
  uint32_t length_u = (uint32_t)sizeOfPath;
  int length = sizeOfPath;
  if (_NSGetExecutablePath(fullpath, &length_u) == 0) {
    length = strlen(fullpath);
  }
#endif

  if (length == sizeOfPath) {
    return -1;
  }

  fullpath[length] = 0;
  fullpath = getPathPart(fullpath);

  return 0;
}

char* OlyUtility::readFromDisk(const char* file, unsigned int *size, bool appendNull) {
  // Open the file
  FILE* pFile = fopen(file, "rb");
  if (pFile==NULL) {
    return NULL;
  }

  // Obtain file size
  fseek(pFile , 0 , SEEK_END);
  unsigned int lSize = ftell(pFile);
  rewind(pFile);

  // Allocate memory to contain the whole file
  char* buffer = (char*)malloc(lSize + (int)appendNull);
  if (buffer == NULL) {
    fclose(pFile);
    return NULL;
  }

  // Copy the file into the buffer
  if (fread(buffer, 1, lSize, pFile) != lSize) {
    free(buffer);
    fclose(pFile);
    return NULL;
  }

  // Terminate
  fclose(pFile);

  if (appendNull) {
    buffer[lSize] = 0;
  }

  if (size) {
    *size = lSize;
  }

  return buffer;
}

int OlyUtility::writeToDisk(const char* path, const char* data) {
  // Open the file
  FILE* pFile = fopen(path, "wb");
  if (pFile == NULL) {
    return -1;
  }

  // Write the data to disk
  if (fwrite(data, 1, strlen(data), pFile) != strlen(data)) {
    fclose(pFile);
    return -1;
  }

  // Terminate
  fclose(pFile);
  return 0;
}

int OlyUtility::appendToDisk(const char* path, const char* data) {
  // Open the file
  FILE* pFile = fopen(path, "a");
  if (pFile == NULL) {
    return -1;
  }

  // Write the data to disk
  if (fwrite(data, 1, strlen(data), pFile) != strlen(data)) {
    fclose(pFile);
    return -1;
  }

  // Terminate
  fclose(pFile);
  return 0;
}

/**
 * Copies the srcFile into dstFile in 1kB chunks.
 * The dstFile will be overwritten if it exists.
 * 0 is returned on an error; otherwise 1.
 */
#define TRANSFER_SIZE 1024
int OlyUtility::copyFile(const char* srcFile, const char* dstFile) {
  char* buffer = (char*)malloc(TRANSFER_SIZE);
  FILE * f_src = fopen(srcFile,"rb");
  if (!f_src) {
    return 0;
  }
  FILE * f_dst = fopen(dstFile,"wb");
  if (!f_dst) {
    fclose(f_src);
    return 0;
  }
  while (!feof(f_src)) {
    int num_bytes_read = fread(buffer, 1, TRANSFER_SIZE, f_src);
    if (num_bytes_read < TRANSFER_SIZE && !feof(f_src)) {
      fclose(f_src);
      fclose(f_dst);
      return 0;
    }
    int num_bytes_written = fwrite(buffer, 1, num_bytes_read, f_dst);
    if (num_bytes_written != num_bytes_read) {
      fclose(f_src);
      fclose(f_dst);
      return 0;
    }
  }
  fclose(f_src);
  fclose(f_dst);
  free(buffer);
  return 1;
}

const char* OlyUtility::getFilePart(const char* path) {
  const char* last_sep = strrchr(path, PATH_SEPARATOR);

  // in case path is not a full path
  if (last_sep == NULL) {
    return path;
  }

  return last_sep++;
}

// getPathPart may modify the contents of path
// returns the path including the trailing path separator
char* OlyUtility::getPathPart(char* path) {
  char* last_sep = strrchr(path, PATH_SEPARATOR);

  // in case path is not a full path
  if (last_sep == NULL) {
    return 0;
  }
  last_sep++;
  *last_sep = 0;

  return (path);
}