/*
 * Copyright (C) 2018 "IoT.bzh"
 * Author Jonathan Aillet <jonathan.aillet@iot.bzh>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define _GNU_SOURCE

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

#include <wrap-json.h>

#include <afb/afb-binding.h>

#include "4a-hal-utilities-data.h"

#include "4a-hal-manager-cb.h"

/*******************************************************************************
 *		HAL Manager event handler function			       *
 ******************************************************************************/

// TBD JAI : to implement
void HalMgrDispatchApiEvent(afb_api_t apiHandle, const char *evtLabel, json_object *eventJ)
{
	AFB_API_WARNING(apiHandle, "Not implemented yet");
	// Use "4a-hal-manager-events.h" to handle events
}

/*******************************************************************************
 *		HAL Manager verbs functions				       *
 ******************************************************************************/

void HalMgrPing(afb_req_t request)
{
	static int count = 0;

	count++;

	AFB_REQ_NOTICE(request, "ping count = %d", count);
	afb_req_success(request, json_object_new_int(count), NULL);

	return;
}

void HalMgrLoaded(afb_req_t request)
{
	int requestJsonErr = 0, allHal = 0, verbose = 0;

	char cardIdString[32];

	afb_api_t apiHandle;
	struct HalMgrData *HalMgrGlobalData;
	struct SpecificHalData *currentHalData;

	json_object *requestJson, *requestAnswer, *apiObject;

	if(! (apiHandle = afb_req_get_api(request))) {
		afb_req_fail(request, "api_handle", "Can't get hal manager api handle");
		return;
	}

	if(! (HalMgrGlobalData = (struct HalMgrData *) afb_api_get_userdata(apiHandle))) {
		afb_req_fail(request, "hal_manager_data", "Can't get hal manager data");
		return;
	}

	currentHalData = HalMgrGlobalData->halDataList;

	if(! currentHalData) {
		afb_req_success(request, NULL, "No Hal Api loaded");
		return;
	}

	requestAnswer = json_object_new_array();
	if(! requestAnswer) {
		afb_req_fail(request, "json_answer", "Can't generate json answer");
		return;
	}

	if(! (requestJson = afb_req_json(request)))
		AFB_REQ_NOTICE(request, "Can't get request json");
	else
		requestJsonErr = wrap_json_unpack(requestJson, "{s?:b s?:b}", "all", &allHal, "verbose", &verbose);

	while(currentHalData) {
		if(allHal || currentHalData->status == HAL_STATUS_READY) {
			// Case if request key is 'verbose' and value is bigger than 0
			if(! requestJsonErr && verbose) {
				if(currentHalData->sndCardId >= 0)
					snprintf(cardIdString, sizeof(cardIdString), "hw:%i", currentHalData->sndCardId);
				else
					snprintf(cardIdString, sizeof(cardIdString), "not-found");

				wrap_json_pack(&apiObject,
					       "{s:s s:i s:s s:i s:s s:s s:s s:s s:s}",
					       "api", currentHalData->apiName,
					       "status", (int) currentHalData->status,
					       "sndcard", currentHalData->sndCardPath,
					       "internal", (int) currentHalData->internal,
					       "info", currentHalData->info ? currentHalData->info : "",
					       "author", currentHalData->author ? currentHalData->author : "",
					       "version", currentHalData->version ? currentHalData->version : "",
					       "date", currentHalData->date ? currentHalData->date : "",
					       "snd-dev-id", cardIdString);
				json_object_array_add(requestAnswer, apiObject);
			}
			// Case if request is empty or not handled
			else {
				json_object_array_add(requestAnswer, json_object_new_string(currentHalData->apiName));
			}
		}

		currentHalData = currentHalData->next;
	}

	afb_req_success(request, requestAnswer, "Requested data");
}

void HalMgrLoad(afb_req_t request)
{
	int cardId = -1;

	char *apiName, *sndCardPath, *info = NULL, *author = NULL, *version = NULL, *date = NULL;

	afb_api_t apiHandle;
	struct HalMgrData *HalMgrGlobalData;
	struct SpecificHalData *addedHal;

	json_object *requestJson, *apiReceivedMetadata;

	if(! (apiHandle = afb_req_get_api(request))) {
		afb_req_fail(request, "api_handle", "Can't get hal manager api handle");
		return;
	}

	if(! (HalMgrGlobalData = (struct HalMgrData *) afb_api_get_userdata(apiHandle))) {
		afb_req_fail(request, "hal_manager_data", "Can't get hal manager data");
		return;
	}

	if(! (requestJson = afb_req_json(request))) {
		afb_req_fail(request, "request_json", "Can't get request json");
		return;
	}

	if(! json_object_object_get_ex(requestJson, "metadata", &apiReceivedMetadata)) {
		afb_req_fail(request, "api_metadata", "Can't get json metadata section to register external hal");
		return;
	}

	if(wrap_json_unpack(apiReceivedMetadata,
			    "{s:s s:s s?:s s?:s s?:s s?:s s?:i}",
			    "api", &apiName,
			    "uid", &sndCardPath,
			    "info", &info,
			    "author", &author,
			    "version", &version,
			    "date", &date,
			    "snd-dev-id", &cardId)) {
		afb_req_fail(request, "api_metadata", "Can't metadata of api to register");
		return;
	}

	addedHal = HalUtlAddHalApiToHalList(&HalMgrGlobalData->halDataList);

	addedHal->internal = 0;
	// TBD JAI : initialize external to unavailable once event from external hal will be handled
	addedHal->status = HAL_STATUS_READY;

	addedHal->apiName = strdup(apiName);
	addedHal->sndCardPath = strdup(sndCardPath);

	if(info)
		addedHal->info = strdup(info);

	if(author)
		addedHal->author = strdup(author);

	if(version)
		addedHal->version = strdup(version);

	if(date)
		addedHal->date = strdup(date);

	addedHal->sndCardId = cardId;

	// TBD JAI: add subscription to this api status events, if subscription fails, remove hal from list

	afb_req_success(request, NULL, "Api successfully registered");
}

void HalMgrUnload(afb_req_t request)
{
	char *apiName;

	afb_api_t apiHandle;
	struct HalMgrData *HalMgrGlobalData;
	struct SpecificHalData *HalToRemove;

	json_object *requestJson;

	if(! (apiHandle = afb_req_get_api(request))) {
		afb_req_fail(request, "api_handle", "Can't get hal manager api handle");
		return;
	}

	if(! (HalMgrGlobalData = (struct HalMgrData *) afb_api_get_userdata(apiHandle))) {
		afb_req_fail(request, "hal_manager_data", "Can't get hal manager data");
		return;
	}

	if(! (requestJson = afb_req_json(request))) {
		afb_req_fail(request, "request_json", "Can't get request json");
		return;
	}

	if(wrap_json_unpack(requestJson, "{s:s}", "api", &apiName)) {
		afb_req_fail(request, "requested_api", "Can't get api to remove");
		return;
	}

	HalToRemove = HalUtlSearchHalDataByApiName(&HalMgrGlobalData->halDataList, apiName);
	if(! HalToRemove) {
		afb_req_fail(request, "requested_api", "Can't find api to remove");
		return;
	}

	if(HalToRemove->internal) {
		afb_req_fail(request, "requested_api", "Can't remove an internal controller api");
		return;
	}

	if(HalUtlRemoveSelectedHalFromList(&HalMgrGlobalData->halDataList, HalToRemove)) {
		afb_req_fail(request, "unregister_error", "Didn't succeed to remove specified api");
		return;
	}

	// TBD JAI: remove subscription to this api status events

	afb_req_success(request, NULL, "Api successfully unregistered");
}

// TBD JAI : to implement
void HalMgrSubscribeEvent(afb_req_t request)
{
	AFB_REQ_WARNING(request, "Not implemented yet");

	afb_req_success(request, json_object_new_boolean(0), NULL);
}

// TBD JAI : to implement
void HalMgrUnsubscribeEvent(afb_req_t request)
{
	AFB_REQ_WARNING(request, "Not implemented yet");

	afb_req_success(request, json_object_new_boolean(0), NULL);
}