#include "commonheaders.h"

// разбивает сообщение szMsg на части длиной iLen, возвращает строку вида PARTzPARTzz
LPSTR splitMsg(LPSTR szMsg, size_t iLen)
{
	Sent_NetLog("split: msg: -----\n%s\n-----\n", szMsg);

	size_t len = mir_strlen(szMsg);
	LPSTR out = (LPSTR)mir_alloc(len * 2);
	LPSTR buf = out;

	WORD msg_id = g_plugin.getWord("msgid", 0) + 1;
	g_plugin.setWord("msgid", msg_id);

	size_t part_all = (len + iLen - 1) / iLen;
	for (size_t part_num = 0; part_num<part_all; part_num++) {
		size_t sz = (len > iLen) ? iLen : len;
		mir_snprintf(buf, 32, "%s%04X%02X%02X", SIG_SECP, msg_id, part_num, part_all);
		memcpy(buf + LEN_SECP + 8, szMsg, sz);
		*(buf + LEN_SECP + 8 + sz) = '\0';

		Sent_NetLog("split: part: %s", buf);

		buf += LEN_SECP + 8 + sz + 1;
		szMsg += sz;
		len -= sz;
	}
	*buf = '\0';
	return out;
}


// собираем сообщение из частей, части храним в структуре у контакта
LPSTR combineMessage(pUinKey ptr, LPSTR szMsg)
{
	Sent_NetLog("combine: part: %s", szMsg);

	int msg_id, part_num, part_all;
	sscanf(szMsg, "%4X%2X%2X", &msg_id, &part_num, &part_all);
	//
	pPM ppm = nullptr, pm = ptr->msgPart;
	if (!ptr->msgPart) {
		pm = ptr->msgPart = new partitionMessage;
		memset(pm, 0, sizeof(partitionMessage));
		pm->id = msg_id;
		pm->message = new LPSTR[part_all];
		memset(pm->message, 0, sizeof(LPSTR)*part_all);
	}
	else
		while (pm) {
		if (pm->id == msg_id) break;
		ppm = pm; pm = pm->nextMessage;
		}
	if (!pm) { // nothing to found
		pm = ppm->nextMessage = new partitionMessage;
		memset(pm, 0, sizeof(partitionMessage));
		pm->id = msg_id;
		pm->message = new LPSTR[part_all];
		memset(pm->message, 0, sizeof(LPSTR)*part_all);
	}
	pm->message[part_num] = new char[mir_strlen(szMsg)];
	mir_strcpy(pm->message[part_num], szMsg + 8);

	Sent_NetLog("combine: save part: %s", pm->message[part_num]);

	int len = 0, i;
	for (i = 0; i < part_all; i++) {
		if (pm->message[i] == nullptr) break;
		len += (int)mir_strlen(pm->message[i]);
	}
	if (i == part_all) { // combine message
		SAFE_FREE(ptr->tmp);
		ptr->tmp = (LPSTR)mir_alloc(len + 1); *(ptr->tmp) = '\0';
		for (i = 0; i < part_all; i++) {
			mir_strcat(ptr->tmp, pm->message[i]);
			delete pm->message[i];
		}
		delete pm->message;
		if (ppm) ppm->nextMessage = pm->nextMessage;
		else 	ptr->msgPart = pm->nextMessage;
		delete pm;

		Sent_NetLog("combine: all parts: -----\n%s\n-----\n", ptr->tmp);
		// combined one message
		return ptr->tmp;
	}

	Sent_NetLog("combine: not all parts");
	// not combined yet
	return nullptr;
}

// отправляет сообщение, если надо то разбивает на части
int splitMessageSend(pUinKey ptr, LPSTR szMsg)
{
	int len = (int)mir_strlen(szMsg);
	int par = (getContactStatus(ptr->hContact) == ID_STATUS_OFFLINE) ? ptr->proto->split_off : ptr->proto->split_on;
	if (par && len > par) {
		int ret;
		LPSTR msg = splitMsg(szMsg, par);
		LPSTR buf = msg;
		while (*buf) {
			len = (int)mir_strlen(buf);
			LPSTR tmp = mir_strdup(buf);
			ret = ProtoChainSend(ptr->hContact, PSS_MESSAGE, (WPARAM)PREF_METANODB, (LPARAM)tmp);
			mir_free(tmp);
			buf += len + 1;
		}
		SAFE_FREE(msg);
		return ret;
	}
	
	return (int)ProtoChainSend(ptr->hContact, PSS_MESSAGE, (WPARAM)PREF_METANODB, (LPARAM)szMsg);
}