#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "mime.h"
#include "http_common.h"

static const char* methods[]=
{
    "GET",
    "POST"
};


static int get_version(const char* versionPos, char* version)
{
    char* versionEnd = NULL;
    int versionlen = 0;
    if(versionPos == NULL || version == NULL)
        return -1;

    versionEnd = strstr(versionPos, "\n");
    versionlen = versionEnd - versionPos;

    #if 0
    printf("versionlen = [%d]\n", versionlen);
    #endif

    if(versionlen >10 || versionlen <0)
        return -1;

    strncpy(version, versionPos, versionlen);

    return 0;    
}


static int get_method(const char* request, EN_REQ_METHOD* method)
{
    
    if(strncmp(request, methods[HTTP_GET], 3) == 0)
    {
        *method = HTTP_GET;
    }else if(strncmp(request, methods[HTTP_POST], 4) == 0)
    {
        *method = HTTP_POST;
    }else
    {
        *method = HTTP_ELSE;
    }
    
    return (int)(*method);    
}


/*--------------------------------------------------------------

functionname: parse_request
param:  NA
return: NA
author: xxxx
    
--------------------------------------------------------------*/

int parse_request(const char* request, STR_REQUEST* result)
{
    int method=0;    
    int urilen =0;
    char* version_pos = NULL;
    if(request == NULL || result == NULL)
        return -1;
    
    method =get_method(request, &(result->method));    
    //only apply GET POST
    if(method == HTTP_ELSE)
        return -1;

    //-----------------get URI---------------------------------    
    version_pos = strstr(request, "HTTP");
    //malloc uri
    result->URI = (char*)malloc(urilen + WEBAPP_DIR_LEN);
    //
    if(result->URI == NULL)
    {
        perror("malloc failed");
        return -1;
    }

    bzero(result->URI, urilen);
    strncpy(result->URI, WEBAPP_DIR, WEBAPP_DIR_LEN);
    //
    if(result->method == HTTP_GET)
    {
        urilen = version_pos - (request+4) -1;    
        strncpy((result->URI)+WEBAPP_DIR_LEN, request + 4, urilen);
    }

    if(result->method == HTTP_POST)
    {
        urilen = version_pos - (request + 5) -1;
        strncpy(result->URI+WEBAPP_DIR_LEN, request + 5, urilen);
    }
    
    //---------------------------------------------------------
    
    if(get_version(version_pos, result->http_version) == -1)
        return -1; 

    return 0;    
}