#ifndef ICCLIENT_REQUEST_H
#define ICCLIENT_REQUEST_H

#if defined __ANDROID__ && defined DEBUG
#include <android/log.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#ifndef __EMSCRIPTEN__
#include <curl/curl.h>
#endif
#include "icclient/typedefs.h"

struct body {
	size_t num_pairs;
	struct pair {
		const char *key;
		const char *value;
	} pairs[16];
};

#ifdef __EMSCRIPTEN__
extern emscripten_fetch_attr_t attr;
#else
extern CURL *curl;
extern char *server_url;
size_t append(char *, size_t, size_t, icclient_fetch_t *);
#endif

inline void init(const char *url, const char *certificate)
{
#ifdef __EMSCRIPTEN__
	emscripten_fetch_attr_init(&attr);
	attr.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;
#else
	curl_global_init(CURL_GLOBAL_SSL);
	curl = curl_easy_init();
	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
	curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "");
	if (certificate)
		curl_easy_setopt(curl, CURLOPT_CAINFO, certificate);
#ifdef DEBUG
	curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
#endif
	size_t length = strlen(url);
	size_t append = url[length - 1] != '/';
	server_url = malloc(length + append + 1);
	strcpy(server_url, url);
	if (append)
		strcat(server_url, "/");
#endif
}

inline void request(void (*handler)(icclient_fetch_t *), void *callback, struct body *body, char *fmt, ...)
{
	va_list ap;
	char *p, *sval;
	unsigned int ival;
	size_t length =
#ifndef __EMSCRIPTEN__
		strlen(server_url) +
#endif
		strlen(fmt);

	va_start(ap, fmt);
	for (p = fmt; *p; p++) {
		if (*p != '%')
			continue;
		switch(*++p) {
			case 's':
				sval = va_arg(ap, char *);
				length += strlen(sval) - 2;
				break;
			case 'd':
				ival = va_arg(ap, unsigned int);
				do {
					length++;
				} while ((ival /= 10));
				length -= 2;
				break;
			default:
				break;
		}
	}
	va_end(ap);

	char url[length + 1];
#ifdef __EMSCRIPTEN__
	memset(url, '\0', length + 1);
#else
	strcpy(url, server_url);
#endif

	va_start(ap, fmt);
	for (p = fmt; *p; p++) {
		if (*p != '%')
			continue;
		switch(*++p) {
			case 's':
				sval = va_arg(ap, char *);
				strcat(url, sval);
				break;
			case 'd':
				ival = va_arg(ap, unsigned int);
				sprintf(url, "%s%d", url, ival);
				break;
			default:
				break;
		}
	}
	va_end(ap);

#ifdef __EMSCRIPTEN__
	attr.onsuccess = handler;
	attr.userData = callback;
	strcpy(attr.requestMethod, "GET");
	emscripten_fetch(&attr, url);
#else
	curl_easy_setopt(curl, CURLOPT_URL, url);
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, append);
	icclient_fetch_t fetch = { .userData = callback, .numBytes = 0 };
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fetch);
	struct curl_httppost *post, *last = NULL;
	if (body) {
		for (size_t i = 0; i < body->num_pairs; i++) {
			struct pair pair = body->pairs[i];
			if (!pair.value)
				continue;
			curl_formadd(&post, &last,
					CURLFORM_COPYNAME, pair.key,
					CURLFORM_PTRCONTENTS, pair.value,
					CURLFORM_END);
		}
		last = NULL;
		curl_easy_setopt(curl, CURLOPT_HTTPPOST, post);
	} else
		curl_easy_setopt(curl, CURLOPT_HTTPGET, 1L);
	CURLcode res = curl_easy_perform(curl);
	if (post)
		curl_formfree(post);
	if (res == CURLE_OK) 
		handler(&fetch);
#ifdef DEBUG
	else {
		const char *error = curl_easy_strerror(res);
#ifdef __ANDROID__
		__android_log_print(ANDROID_LOG_ERROR, "libicclient.so", "%s", error);
#else
		fprintf(stderr, "%s\n", error);
#endif
	}
#endif
#endif
}

#ifndef __EMSCRIPTEN__
inline void cleanup()
{
	free(server_url);
	curl_easy_cleanup(curl);
	curl_global_cleanup();
}
#endif

#endif