#include <dirent.h>
#include "http_server.h"
#include "libs/ini.h"

#define MATCH(s, n) strcmp(section, s) == 0 && strcmp(name, n) == 0

#ifdef USE_OPENSSL
void init_openssl()
{ 
    SSL_load_error_strings();	
    OpenSSL_add_ssl_algorithms();
}

void cleanup_openssl()
{
    EVP_cleanup();
}

SSL_CTX *create_context()
{
    const SSL_METHOD *method;
    SSL_CTX *ctx;

    method = SSLv23_server_method();

    ctx = SSL_CTX_new(method);
    if (!ctx) {
	perror("Unable to create SSL context");
	ERR_print_errors_fp(stderr);
	exit(EXIT_FAILURE);
    }

    return ctx;
}

void configure_context(SSL_CTX *ctx)
{
    SSL_CTX_set_ecdh_auto(ctx, 1);

    /* Set the key and cert */
    if (SSL_CTX_use_certificate_file(ctx, server_config.sslcert, SSL_FILETYPE_PEM) <= 0) {
        ERR_print_errors_fp(stderr);
	exit(EXIT_FAILURE);
    }

    if (SSL_CTX_use_PrivateKey_file(ctx, server_config.sslkey, SSL_FILETYPE_PEM) <= 0 ) {
        ERR_print_errors_fp(stderr);
	exit(EXIT_FAILURE);
    }
}

#endif

static int config_handler(void* conf, const char* section, const char* name,
                   const char* value)
{
    config_t* pconfig = (config_t*)conf;
	//char * ppath = NULL;
    if (MATCH("SERVER", "port")) {
        pconfig->port = atoi(value);
    } else if (MATCH("SERVER", "plugins")) {
        pconfig->plugins_dir = strdup(value);
    } else if (MATCH("SERVER", "plugins_ext")) {
        pconfig->plugins_ext = strdup(value);
    } else if(MATCH("SERVER", "database")) {
        pconfig->db_path = strdup(value);
    } else if(MATCH("SERVER", "htdocs")) {
        pconfig->htdocs = strdup(value);
    } else if(MATCH("SERVER", "tmpdir")) {
        pconfig->tmpdir = strdup(value);
    }
	else if(MATCH("SERVER", "backlog")) {
        pconfig->backlog = atoi(value);
    }
#ifdef USE_OPENSSL
	else if(MATCH("SERVER", "ssl.enable")) {
        pconfig->usessl = atoi(value);
    }
	else if(MATCH("SERVER", "ssl.cert")) {
        pconfig->sslcert = strdup(value);
    }
	else if(MATCH("SERVER", "ssl.key")) {
        pconfig->sslkey = strdup(value);
    }
#endif
	else if (strcmp(section, "RULES") == 0)
	{
		dput( pconfig->rules, strdup(name),strdup(value));
    }
	else if(strcmp(section,"AUTOSTART")==0){
		// The server section must be added before the autostart section
		// auto start plugin
		plugin_load(value);
    } else {
        return 0;  /* unknown section/name, error */
    }
    return 1;
}
void init_file_system()
{
	struct stat st;
	if (stat(server_config.plugins_dir, &st) == -1)
   		mkdir(server_config.plugins_dir, 0755);
   	if (stat(server_config.db_path, &st) == -1)
   		mkdir(server_config.db_path, 0755);
   	if (stat(server_config.htdocs, &st) == -1)
   		mkdir(server_config.htdocs, 0755);
   	if (stat(server_config.tmpdir, &st) == -1)
   		mkdir(server_config.tmpdir, 0755);
   	else
   	{
   		removeAll(server_config.tmpdir,0);
   	}

}
void load_config(const char* file)
{
	server_config.port = 8888;
	server_config.plugins_dir = "plugins/";
	server_config.plugins_ext = ".dylib";
	server_config.db_path = "databases/";
	server_config.htdocs = "htdocs";
	server_config.tmpdir = "tmp";
	server_config.backlog = 100;
	server_config.rules = dict();
#ifdef USE_OPENSSL
	server_config.usessl = 0;
	server_config.sslcert = "cert.pem";
	server_config.sslkey = "key.pem";
#endif
	if (ini_parse(file, config_handler, &server_config) < 0) {
		LOG("Can't load '%s'\n. Used defaut configuration", file);
	}
	else
	{
		LOG("Using configuration : %s\n", file);
#ifdef USE_OPENSSL
		LOG("Enable %d\n", server_config.usessl);
		LOG("cert %s\n", server_config.sslcert);
		LOG("key %s\n", server_config.sslkey);
#endif
	}
	init_file_system();
}
void stop_serve(int dummy) {
	free(server_config.rules);
    unload_all_plugin();
}
int main(int argc, char* argv[])
{
// load the config first
	if(argc==1)
		load_config(CONFIG);
	else
		load_config(argv[1]);

	int server_sock = -1;
	unsigned port = server_config.port;
	int client_sock = -1;
	struct sockaddr_in client_name;
	socklen_t client_name_len = sizeof(client_name);
	pthread_t newthread;

	// ignore the broken PIPE error when writing 
	//or reading to/from a closed socked connection
	signal(SIGPIPE, SIG_IGN);
	signal(SIGABRT, SIG_IGN);
	signal(SIGINT, stop_serve);

#ifdef USE_OPENSSL
	SSL_CTX *ctx;
	if( server_config.usessl == 1 )
	{
		init_openssl();
    	ctx = create_context();

    	configure_context(ctx);
	}
    
#endif

	server_sock = startup(&port);
	LOG("httpd running on port %d\n", port);

	while (1)
	{
		antd_client_t client;
		client_sock = accept(server_sock,(struct sockaddr *)&client_name,&client_name_len);
		if (client_sock == -1)
		{
			perror("Cannot accept client request\n");
			continue;
		}
		/* accept_request(client_sock); */

#ifdef USE_OPENSSL
		client.ssl = NULL;
		if(server_config.usessl == 1)
		{
			client.ssl = (void*)SSL_new(ctx);
        	SSL_set_fd((SSL*)client.ssl, client_sock);

        	if (SSL_accept((SSL*)client.ssl) <= 0) {
            	ERR_print_errors_fp(stderr);
				continue;
        	}
		}
#endif
		client.sock = client_sock;
		if (pthread_create(&newthread , NULL,(void *(*)(void *))accept_request, (void *)&client) != 0)
			perror("pthread_create");
		else
		{
			//reclaim the stack data when thread finish
			pthread_detach(newthread) ;
		}
	}

	close(server_sock);

	return(0);
}