#include <cassert>
#include <cstdlib>
#include <cstdio>

#include "aixlog.hpp"

#include "util.h"

const uint MAX_FILESIZE = 2 * 1024 * 1024; // 2MB
const uint MAX_STRING_LENGTH = 1024;

// TODO: don't use ftell() to get filesize
// 	https://wiki.sei.cmu.edu/confluence/display/c/FIO19-C.+Do+not+use+fseek%28%29+and+ftell%28%29+to+compute+the+size+of+a+regular+file
char *
utilDumpTextFile(const char* filename)
{
	LOG(INFO) << "loading filename, " << filename << "\n";
	std::FILE* fp = std::fopen(filename, "rt");
	assert(fp);

	std::fseek(fp, 0, SEEK_END);
	uint length = std::ftell(fp);
	std::fseek(fp, 0, SEEK_SET);
	assert(length < MAX_FILESIZE);
	// TODO: check error codes for fseek and ftell

	char* buf = (char *) std::calloc(length, sizeof(char));
	assert(buf);

	std::fread(buf, sizeof(char), length, fp);
	// TODO: check fp w/ ferror() here

	return buf;
}

void *
utilLogAlloc(uint item_count, uint type_size, const char* file_name, const int line)
{
	assert(item_count > 0); // that was a fun bug

	void* mem = std::calloc(item_count, type_size);

	if (mem == nullptr) {
		LOG(ERROR) << "Memory allocation failed, called from "
					<< file_name << ":" << line;
	}

	assert(mem != nullptr); // might as well stop execution here

	return mem;
}

// TODO: search/replace other calls to std::free with this
void
utilSafeFree(void* mem)
{
	if (mem != nullptr) {
		std::free(mem);
		mem = nullptr;
	}
}

// TODO: re-use non-const version, macro or cast away const
void utilSafeFree(const void* mem)
{
	if (mem != nullptr) {
		std::free((void *) mem);
		mem = nullptr;
	}
}