#include <iostream>
#include <event2/http.h>
#include<event2/event.h>
#include <event2/listener.h>
#include <event2/keyvalq_struct.h>
#include <event2/buffer.h>
#include <string.h>
#ifndef _WIN32
#include <signal.h>
#include "test_http_server.h"
#endif // !_WIN32

using namespace std;

#define WEBROOT "."
#define DEFAULTINDEX "index.html"

void http_cb(struct evhttp_request* request, void *arg) {
	cout << "http_cb" << endl;
	//1 获取浏览器请求信息
	//url
	const  char* uri = evhttp_request_get_uri(request);
	cout << "uri:" << uri << endl;

	//获取请求类型Get Post
	string cmdtype;
	evhttp_cmd_type type = evhttp_request_get_command(request);
	switch (type)
	{
	case EVHTTP_REQ_GET:
		cout << "EVHTTP_REQ_GET" << endl;
		break;
	case EVHTTP_REQ_POST:

		break;
	case EVHTTP_REQ_HEAD:
		break;
	case EVHTTP_REQ_PUT:
		break;
	case EVHTTP_REQ_DELETE:
		break;
	case EVHTTP_REQ_OPTIONS:
		break;
	case EVHTTP_REQ_TRACE:
		break;
	case EVHTTP_REQ_CONNECT:
		break;
	case EVHTTP_REQ_PATCH:
		break;
	default:
		break;
	}

	//消息报头
	evkeyvalq *headers = evhttp_request_get_input_headers(request);
	cout << "========headers========\n" << endl;

	for (evkeyval *p = headers->tqh_first; p != NULL; p = p->next.tqe_next) {
		cout << p->key << ":" << p->value << endl;
	}

	//请求正文
	evbuffer*inbuf = evhttp_request_get_input_buffer(request);
	char buf[1024] = { 0 };
	cout << "=========Input data ===========" << endl;
	while (evbuffer_get_length(inbuf)) {
		int n = evbuffer_remove(inbuf, buf, sizeof(buf) - 1);

		if (n > 0) {
			buf[n] = '\0';
			cout << buf << endl;
		}
	}


	//2 回复浏览器
	//状态行  响应正文

	//消息报头
	evkeyvalq *outhead = evhttp_request_get_output_headers(request);


	//分析URI
	//设置根目录
	string filepath = WEBROOT;
	filepath += uri;
	if (strcmp(uri, "/") == 0) {
		filepath += DEFAULTINDEX;
	}

	//文件后缀	
	int pos = filepath.rfind(".");
	string postfix = filepath.substr(pos+1,filepath.size() - (pos+1));
	if (postfix == "jpg" || postfix == "png" || postfix == "gif" || postfix == "ico") {
		string temp = "image/" + postfix;
		evhttp_add_header(outhead, "Content-Type", temp.c_str());
	}
	else if (postfix == "zip") {
		evhttp_add_header(outhead, "Content-Type", "application/zip");
	}
	else if (postfix == "html") {
		evhttp_add_header(outhead, "Content-Type", "text/html;charset=UTF8");
	}
	else if (postfix == "css") {
		evhttp_add_header(outhead, "Content-Type", "text/css");
	}

	FILE *fp = fopen(filepath.c_str(), "rb"); 
	if (!fp) {
		evhttp_send_reply(request, HTTP_NOTFOUND, "", 0);
		return;
	}
	
		evbuffer *outbuf = evhttp_request_get_output_buffer(request);

		for (;;) {
			int len = fread(buf, 1,sizeof(buf), fp);
			if (len <= 0)
				break;
			evbuffer_add(outbuf, buf, len);
		}
		fclose(fp);

		evhttp_send_reply(request, HTTP_OK, "", outbuf);
	

}

int main()
{
#ifdef _WIN32
	//初始化socket库
	WSADATA wsa;
	WSAStartup(MAKEWORD(2, 2), &wsa);
#else 
	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) { //忽略管道信号，发送数据给已关闭的socket，会飞掉！
		return 1;
	}
#endif

	//创建libevent上下文
	event_base* base = event_base_new();
	if (base) {
		std::cout << "test server" << "\n";
	}

	//http 服务器
	//1.创建evhttp上下文
	evhttp *evh = evhttp_new(base);

	//2.绑定端口、IP
	if (evhttp_bind_socket(evh, "0.0.0.0", 8080) != 0) {
		cout << "绑定失败" << endl;
	}

	//3. 设定回调函数
	evhttp_set_gencb(evh, http_cb, 0);


	if (base)
		event_base_dispatch(base); //事件分发处理
	if (base)
		event_base_free(base);
	if (evh)
		evhttp_free(evh);

#if _WIN32
	WSACleanup();
#endif // _WIN32



	return 0;
}