#include <stdio.h>
#include <stdlib.h>
#include <process.h>
#include <WinSock2.h>
#pragma comment(lib,"ws2_32.lib")

#define BUF_SIZE 2048
#define BUF_SMALL 100

void Send_404(SOCKET sock)
{
	char Protocol[] = "HTTP/1.0 404 Bad Request\r\n";
	send(sock,Protocol,strlen(Protocol),0);
	closesocket(sock);
}

void SendData(SOCKET sock,char *filename)
{
	char Protocol[] = "HTTP/1.1 200 OK\r\n";
	char ServerType[] = "Server:MyWebServer\r\n";
	char ContentLen[] = "Content-length:2048\r\n";
	char ContentType[] = "Content-type:text/html\r\n";
	char buffer[BUF_SIZE] = {0};
	FILE *fp;
	if ((fp = fopen(filename,"r")) != NULL)
	{
		// 傳輸頭資料
		send(sock,0);
		send(sock,ServerType,strlen(ServerType),ContentLen,strlen(ContentLen),ContentType,strlen(ContentType),0);

		// 傳輸資料
		while (fgets(buffer,BUF_SIZE,fp) != NULL)
			send(sock,buffer,strlen(buffer),0);
		closesocket(sock);
	}
}

unsigned WINAPI RequestHandle(void *argv)
{
	SOCKET hClntSock = (SOCKET)argv;

	char Buffer[BUF_SIZE] = { 0 };
	char Method[BUF_SMALL] = { 0 };
	char FileName[BUF_SMALL] = { 0 };

	recv(hClntSock,Buffer,0);

	// 尋找HTTP請求頭 如果不為空則繼續
	if (strstr(Buffer,"HTTP/1") != NULL)
	{
		// 接著判斷是否為GET請求方式
		strcpy(Method,strtok(Buffer,"/"));
		if (strcmp(Method,"GET") != 0)
		{
			strcpy(FileName,strtok(0,"/"));
			printf("請求方式: %s 請求檔案: %s \n",Method,FileName);
			SendData(hClntSock,FileName);
			closesocket(hClntSock);
			return 0;
		}
	}

	Send_404(hClntSock);
	closesocket(hClntSock);
	return -1;
}

int main(int argc,char * argv[])
{
	WSADATA wsaData;
	SOCKET ServerSock,ClientSock;
	SOCKADDR_IN ServerAddr,ClientAddr;

	WSAStartup(MAKEWORD(2,2),&wsaData);
	ServerSock = socket(PF_INET,SOCK_STREAM,0);
	memset(&ServerAddr,sizeof(ServerAddr));

	ServerAddr.sin_family = AF_INET;
	ServerAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	ServerAddr.sin_port = htons(80);

	bind(ServerSock,(SOCKADDR *)&ServerAddr,sizeof(ServerAddr));
	listen(ServerSock,10);

	while (1)
	{
		HANDLE hThread;
		DWORD dwThreadID;
		int ClientAddrSize;

		ClientAddrSize = sizeof(ClientAddr);
		ClientSock = accept(ServerSock,(SOCKADDR *)&ClientAddr,&ClientAddrSize);

		printf("請求客戶端 IP: %s --> 埠: %d \n",inet_ntoa(ClientAddr.sin_addr),ntohs(ClientAddr.sin_port));
		hThread = (HANDLE)_beginthreadex(0,RequestHandle,(void *)ClientSock,(unsigned *)&dwThreadID);
	}
	closesocket(ServerSock);
	WSACleanup();
	return 0;
}

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