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/*
 * transmission-remote-gtk - A GTK RPC client to Transmission
 * Copyright (C) 2010  Alan Fitton

 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>

#include <glib-object.h>
#include <json-glib/json-glib.h>

#include "trg-client.h"
#include "http.h"

static struct http_response *trg_http_perform_inner(trg_client * client,
						    gchar * req,
						    gboolean recurse);

static size_t http_receive_callback(void *ptr, size_t size, size_t nmemb,
				    void *data);

static size_t header_callback(void *ptr, size_t size, size_t nmemb,
			      void *data);

void http_response_free(struct http_response *response)
{
    if (response->data != NULL)
	g_free(response->data);

    g_free(response);
}

static struct http_response *trg_http_perform_inner(trg_client * tc,
						    gchar * req,
						    gboolean recurse)
{
    CURL *handle;
    long httpCode;
    struct http_response *response;
    struct curl_slist *headers = NULL;

    response = g_new(struct http_response, 1);
    response->size = 0;
    response->status = -1;
    response->data = NULL;

    handle = curl_easy_init();

    curl_easy_setopt(handle, CURLOPT_USERAGENT, "trg");
    curl_easy_setopt(handle, CURLOPT_PASSWORD, tc->password);
    curl_easy_setopt(handle, CURLOPT_USERNAME, tc->username);
    curl_easy_setopt(handle, CURLOPT_URL, tc->url);
    curl_easy_setopt(handle, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
    curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION,
		     &http_receive_callback);
    curl_easy_setopt(handle, CURLOPT_WRITEDATA, (void *) response);
    curl_easy_setopt(handle, CURLOPT_HEADERFUNCTION, &header_callback);
    curl_easy_setopt(handle, CURLOPT_WRITEHEADER, (void *) tc);
    curl_easy_setopt(handle, CURLOPT_POSTFIELDS, req);
    /*curl_easy_setopt(handle, CURLOPT_VERBOSE, 1); */

    if (tc->session_id != NULL) {
	headers = curl_slist_append(headers, tc->session_id);
	curl_easy_setopt(handle, CURLOPT_HTTPHEADER, headers);
    }

    response->status = curl_easy_perform(handle);

    curl_easy_getinfo(handle, CURLINFO_RESPONSE_CODE, &httpCode);
    curl_easy_cleanup(handle);

    if (headers != NULL)
	curl_slist_free_all(headers);

    if (response->status == CURLE_OK) {
	if (httpCode == HTTP_CONFLICT && recurse == TRUE) {
	    http_response_free(response);
	    return trg_http_perform_inner(tc, req, FALSE);
	} else if (httpCode != HTTP_OK) {
	    response->status = (-httpCode) - 100;
	}
    }

    return response;
}

struct http_response *trg_http_perform(trg_client * tc, gchar * req)
{
    return trg_http_perform_inner(tc, req, TRUE);
}

static size_t
http_receive_callback(void *ptr, size_t size, size_t nmemb, void *data)
{
    size_t realsize = size * nmemb;
    struct http_response *mem = (struct http_response *) data;

    mem->data = realloc(mem->data, mem->size + realsize + 1);
    if (mem->data) {
	memcpy(&(mem->data[mem->size]), ptr, realsize);
	mem->size += realsize;
	mem->data[mem->size] = 0;
    }
    return realsize;
}

static size_t header_callback(void *ptr, size_t size, size_t nmemb,
			      void *data)
{
    char *header = (char *) (ptr);
    trg_client *client = (trg_client *) data;

    if (g_str_has_prefix(header, "X-Transmission-Session-Id: ") == TRUE) {
	char *nl;

	if (client->session_id != NULL)
	    g_free(client->session_id);

	client->session_id = g_strdup(header);
	nl = strrchr(client->session_id, '\r');
	if (nl)
	    *nl = '\0';
    }

    return (nmemb * size);
}