#include"fileOperation.h"
long g_fileSize;  //保存文件大小，全局变量初始化为空
//long g_fileSize = 11152;
char *g_fileBuf;  //保存文件数据
char g_recvBuf[1024];  //保存文件大小
//int main()


bool readFile(struct MsgHeader* pmsg)
{
	FILE* read = fopen(pmsg->fileInfo.fileName, "rb"); //文件指针，rb为二进制方式打开
	if (!read)  //如果读取为空
	{
		perror("文件读取失败\n");
		printf("找不到[%s]文件...\n", pmsg->fileInfo.fileName);
		struct MsgHeader msg = { .msgID = MSG_OPENFILE_FAILD };
		return false;
	}

	//获取文件大小，单位字节
	fseek(read, 0, SEEK_END);  //将文件位置指针移动到最后
	g_fileSize = ftell(read);  //ftell获取当前文件位置指针
	fseek(read, 0, SEEK_SET);  //移动到开头
	printf("filesize:%d\n", g_fileSize);

	//分配内存
	g_fileBuf = calloc(g_fileSize, sizeof(char));  //calloc将内存全部初始化为0
	if (!g_fileBuf)
	{
		return false;
	}
	//将文件读到内存中来
	fread(g_fileBuf, sizeof(char), g_fileSize, read);

	fclose(read);
	return true;
}

bool sendFile(SOCKET s, struct MsgHeader* pmsg)
{
	readFile(pmsg);  //免去在server当中再读文件！！
	//把文件名称和大小发给客户端
	struct MsgHeader msg = { .msgID = MSG_FILESIZE,.fileInfo.fileSize = g_fileSize };
	//fileName = C:\Users\Katherine\Desktop\TyporaHotKey.ahk
	
	char tfname[200] = { 0 }, text[100];  //tfname文件名TyporaHotKey；text后缀名.ahk
	_splitpath(pmsg->fileInfo.fileName, NULL, NULL, tfname, text);  //分割路径
	strcat(tfname, text);  //拼接为TyporaHotKey.ahk，放入tfname
	strcpy(msg.fileInfo.fileName, tfname);  //拷贝到msg.fileInfo.fileName

	//int ret1 = send(s,  //发名称
	int ret2 = send(s, (char*)&msg, sizeof(struct MsgHeader), 0);  //发大小
	
	//发送文件，【g_fileBuf】要改吗？应该不用
	int ret = send(s, g_fileBuf, msg.fileInfo.fileSize,0);  //实际发送的文件大小ret
	if (ret == SOCKET_ERROR)
	{
		err("sendFile");
		return false;
	}
	printf("发送成功(%d)Byte\n", ret);

	return true;
}

void downloadFileName(SOCKET serfd)
{
	char fileName[1024] = "你好，我是隔壁的泰山~";
	gets_s(fileName, 1023);		//获取要下载的文件

	struct MsgHeader file = { .msgID = MSG_FILENAME };
	strcpy(file.fileInfo.fileName, fileName);

	send(serfd, (char*)&file, sizeof(struct MsgHeader), 0);

}

bool recvFile(SOCKET s)
{
	//接收文件大小
	recv(s, g_recvBuf, 1023, 0);
	struct MsgHeader* msg = (struct MsgHeader*)g_recvBuf;
	printf("接收的文件大小为：(%d)Byte\n", msg->fileInfo.fileSize);
	//strcpy(msg->fileInfo.fileName, pmsg->fileInfo.fileName);
	//接收文件时需要分配内存！！
	if (g_fileBuf == NULL)
	{
		g_fileBuf = calloc(msg->fileInfo.fileSize, sizeof(char));
		if (!g_fileBuf)
		{
			return false;
		}
	}
	int ret = recv(s, g_fileBuf, msg->fileInfo.fileSize, 0);
	//int ret = recv(s, g_fileBuf, 1023, 0);
	if (ret == 0)
	{
		printf("服务器正常下线...\n");  
	}
	else if (ret < 0)
	{
		err("recv");
	}
	saveFile(msg);
	return true;
}

bool saveFile(struct MsgHeader* pmsg)
{
	FILE* write = fopen(&(pmsg->fileInfo.fileName), "wb"); //文件指针，wb只允许写数据
	if (!write)  //如果读取为空
	{
		perror("文件读取失败\n");
		return false;
	}

	fwrite(g_fileBuf, sizeof(char), pmsg->fileInfo.fileSize, write);

	fclose(write);
	return true;
}