/*

Import plugin for Miranda NG

Copyright (C) 2012-20 Miranda NG team (https://miranda-ng.org)

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#include "stdafx.h"

#include <m_json.h>

static int mc_makeDatabase(const wchar_t*)
{
	return 1;
}

/////////////////////////////////////////////////////////////////////////////////////////
// JSON text driver, read-only

static int CompareModules(const char *p1, const char *p2)
{
	return mir_strcmp(p1, p2);
}

class CDbxJson : public MDatabaseReadonly, public MZeroedObject
{
	JSONNode *m_root = nullptr;
	LIST<JSONNode> m_events;
	LIST<char> m_modules;

public:
	CDbxJson() :
		m_events(100),
		m_modules(10, CompareModules)
	{}

	~CDbxJson()
	{
		if (m_root != nullptr)
			json_delete(m_root);

		for (auto &it : m_modules)
			mir_free(it);
	}

	void Load()
	{
		// json operates with the only contact with pseudo id=1
		m_cache->AddContactToCache(1);
	}

	int Open(const wchar_t *profile)
	{
		HANDLE hFile = CreateFile(profile, GENERIC_READ, 0, 0, OPEN_ALWAYS, 0, 0);
		if (hFile == INVALID_HANDLE_VALUE)
			return EGROKPRF_CANTREAD;

		DWORD dwSize = GetFileSize(hFile, nullptr), dwRead;
		ptrA szFile((char*)mir_alloc(dwSize + 1));
		BOOL r = ReadFile(hFile, szFile, dwSize, &dwRead, nullptr);
		CloseHandle(hFile);
		if (!r)
			return EGROKPRF_CANTREAD;

		szFile[dwSize] = 0;
		if ((m_root = json_parse(szFile)) == nullptr)
			return EGROKPRF_DAMAGED;

		for (auto &it : m_root->at("history"))
			m_events.insert(&it);

		return EGROKPRF_NOERROR;
	}

	// mcontacts format always store history for one contact only
	STDMETHODIMP_(LONG) GetContactCount(void) override
	{
		return 1;
	}

	STDMETHODIMP_(LONG) GetEventCount(MCONTACT) override
	{
		return m_events.getCount();
	}

	STDMETHODIMP_(BOOL) GetEvent(MEVENT iEvent, DBEVENTINFO *dbei) override
	{
		JSONNode *node = m_events[iEvent - 1];
		if (node == nullptr)
			return 0;

		dbei->eventType = (*node)["type"].as_int();

		dbei->timestamp = 0;
		std::string szTime = (*node)["time"].as_string();
		if (!szTime.empty()) {
			char c;
			struct tm st = {};
			int res = sscanf(szTime.c_str(), "%4d%c%2d%c%2d %2d:%2d:%2d", &st.tm_year, &c, &st.tm_mon, &c, &st.tm_mday, &st.tm_hour, &st.tm_min, &st.tm_sec);
			if (res == 8) {
				st.tm_mon--;
				st.tm_year -= 1900;
				time_t tm = mktime(&st);
				if (tm != -1)
					dbei->timestamp = tm;
			}
		}
		else {
			szTime = (*node)["isotime"].as_string();
			if (!szTime.empty()) {
				struct tm st = {};
				int res = sscanf(szTime.c_str(), "%4d-%2d-%2dT%2d:%2d:%2dZ", &st.tm_year, &st.tm_mon, &st.tm_mday, &st.tm_hour, &st.tm_min, &st.tm_sec);
				if (res == 6) {
					st.tm_mon--;
					st.tm_year -= 1900;
					time_t tm = _mkgmtime(&st);
					if (tm != -1)
						dbei->timestamp = tm;
				}
			}
		}

		if (dbei->timestamp == 0)
			dbei->timestamp = (*node)["timeStamp"].as_int();

		dbei->flags = 0;
		std::string szFlags = (*node)["flags"].as_string();
		for (auto &c : szFlags)
			switch (c) {
			case 'm': dbei->flags |= DBEF_SENT; break;
			case 'r': dbei->flags |= DBEF_READ; break;
			}

		std::string szModule = (*node)["module"].as_string();
		if (!szModule.empty()) {
			dbei->szModule = m_modules.find((char*)szModule.c_str());
			if (dbei->szModule == nullptr) {
				dbei->szModule = mir_strdup(szModule.c_str());
				m_modules.insert(dbei->szModule);
			}
		}

		std::string szBody = (*node)["body"].as_string();
		if (!szBody.empty()) {
			int offset;
			switch (dbei->eventType) {
			case EVENTTYPE_ADDED:
			case EVENTTYPE_FILE:
				offset = sizeof(DWORD);
				break;
			
			case EVENTTYPE_AUTHREQUEST:
				offset = sizeof(DWORD)*2;
				break;

			default:
				offset = 0;
			}

			dbei->flags |= DBEF_UTF;
			dbei->cbBlob = (DWORD)szBody.size() + offset + 2;
			dbei->pBlob = (PBYTE)mir_calloc(dbei->cbBlob);
			strcpy((char*)dbei->pBlob + offset, szBody.c_str());
		}

		return 0;
	}

	STDMETHODIMP_(MEVENT) FindFirstEvent(MCONTACT) override
	{
		return 1;
	}

	STDMETHODIMP_(MEVENT) FindNextEvent(MCONTACT, MEVENT iEvent) override
	{
		if ((int)iEvent >= m_events.getCount())
			return 0;

		return iEvent+1;
	}

	STDMETHODIMP_(MEVENT) FindLastEvent(MCONTACT) override
	{
		int numEvents = m_events.getCount();
		return numEvents ? numEvents-1 : 0;
	}

	STDMETHODIMP_(MEVENT) FindPrevEvent(MCONTACT, MEVENT iEvent) override
	{
		if (iEvent <= 1)
			return 0;

		return iEvent-1;
	}
};

static int mc_grokHeader(const wchar_t *profile)
{
	return CDbxJson().Open(profile);
}

static MDatabaseCommon* mc_load(const wchar_t *profile, BOOL)
{
	std::unique_ptr<CDbxJson> db(new CDbxJson());
	if (db->Open(profile))
		return nullptr;

	db->Load();
	return db.release();
}

static DATABASELINK dblink =
{
	0,
	"mcontacts",
	L"mContacts file driver",
	mc_makeDatabase,
	mc_grokHeader,
	mc_load
};

void RegisterJson()
{
	RegisterDatabasePlugin(&dblink);
}