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/* Copyright C2013 Doug Anson, MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files the "Software", to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 #include "MQTTTransport.h"
 #include "MBEDEndpoint.h"
 
 // MBED Light support
 #include "MBEDLight.h"
 
 // Emulated Resource Factory
 #include "EmulatedResourceFactory.h"
 
 // Emulated Actions we can act on
 #include "EmulatedLightDimmerAction.h"
 #include "EmulatedLightSwitchAction.h"
 
 // string support
 #include <stdlib.h>
 #include <string.h>
   
 // shutdown endpoint reference
 extern void closedown(int code);
  
 // default constructor
 MBEDEndpoint::MBEDEndpoint(ErrorHandler *error_handler,EthernetInterface *ethernet) {
     bool success = true;
     this->m_instance_id = 0;
     this->m_preferences = NULL;
     memset(this->m_lcd_status,0,TEMP_BUFFER_LEN+1);
     memset(this->m_gw_address,0,PREFERENCE_VALUE_LEN+1);
     for(int i=0;i<NUM_TRANSPORTS;++i) this->m_transports[i] = NULL;
     this->m_error_handler = error_handler;
     this->m_error_handler->setEndpoint((void *)this);
     if (success) this->initPreferences();
     if (success) this->initEndpointName();
     if (success) this->logger()->turnLEDBlue();
#ifdef MAC_ADDRESS
     extern char fmt_mac[RESOURCE_VALUE_LEN+1];
     if (success)this->logger()->log("%s (MAC: %s)",ENDPOINT_VERSION_ANNOUNCE,fmt_mac);
#else
     if (success)this->logger()->log(ENDPOINT_VERSION_ANNOUNCE);
#endif
     if (success) this->initGWAddress();
     if (success) this->logger()->log("IOC GW IP: %s",GW_IPADDRESS);
     if (PL_ENABLE && success) this->logger()->log("Philips Light ID: %d Philips Gateway IP: %s",PL_LIGHT_ID,PL_GW_ADDRESS);
     if (success) success = this->initializeEthernet(ethernet);
     if (success) this->logger()->turnLEDYellow();
     if (success)this->m_map = new MBEDToIOCResourceMap(error_handler); 
     if (success) success = this->initializeTransports();
     if (success) success = this->initializeLights();   
     if (success) this->logger()->turnLEDOrange();
     this->logger()->lcdStatusOnly(true);
     if (!success) closedown(2);
 }
 
 // default destructor
 MBEDEndpoint::~MBEDEndpoint() {
     bool success = true;
     if (success) this->logger()->turnLEDYellow();
     if (success) success = this->closeLights();
     if (success) success = this->closeTransports();
     if (success) success = this->closeEthernet();
     if (success) this->logger()->turnLEDBlue();
     if (this->m_map != NULL) delete this->m_map;
 }
  
 // get the IOC <--> MBED resource map
 MBEDToIOCResourceMap *MBEDEndpoint::getMap() { return this->m_map; }
 
 // initialize our preferences
 void MBEDEndpoint::initPreferences() { if (this->m_preferences == NULL) this->m_preferences = new Preferences(this->logger()); if (this->m_preferences != NULL) this->m_preferences->fixCoordsForIOC(); }

 // get our preferences
 Preferences *MBEDEndpoint::preferences() { return this->m_preferences; }
 
 // initialize the GW address from the configuration
 void MBEDEndpoint::initGWAddress() {
     memset(this->m_gw_address,0,PREFERENCE_VALUE_LEN+1);
     this->preferences()->getPreference("gw_address",this->m_gw_address,PREFERENCE_VALUE_LEN,GW_IPADDRESS);
     this->logger()->log("GW IP: %s",this->getGWAddress());
 }
 
 // get our GW address
 char *MBEDEndpoint::getGWAddress() { return this->m_gw_address; }
 
 // get our LCD status
 char *MBEDEndpoint::getLCDStatus() {
     memset(this->m_lcd_status,0,TEMP_BUFFER_LEN+1);
     
     // look at Light#0 to determine the IOC linkage ID...
     char *ioc = this->m_lights[0]->getResourceFactory()->getResourceValue(IOC_LINKAGE_RESOURCE);
     
     // color our LED depending on whether we have IOC linkage or not...
     if (ioc == NULL || strcmp(ioc,IOC_LINKAGE_UNSET) == 0) this->logger()->turnLEDOrange();
     else this->logger()->turnLEDGreen();
           
     sprintf(this->m_lcd_status,"Node: %s\nGW IP: %s\nIOC Link: %s",this->getEndpointName(),this->getGWAddress(),ioc);
     return this->m_lcd_status;
 }
 
 // initialize the Lights
 bool MBEDEndpoint::initializeLights() {
     int index = this->preferences()->getIntPreference("endpoint_id",LIGHT_NAME_INDEX); 
     this->logger()->log("Initializing Lights...");
     for(int i=0;i<NUM_LIGHTS;++i) {
         this->m_lights[i] = new MBEDLight(this->logger(),this->m_transports,i+index,this);
         this->m_lights[i]->setDimmerAction(new EmulatedLightDimmerAction(this->logger(),this->m_lights[i]));
         this->m_lights[i]->setSwitchAction(new EmulatedLightSwitchAction(this->logger(),this->m_lights[i]));
     }
     return true;
 }
 
 // does the input name match any of our light resources?
 int MBEDEndpoint::indexOfLight(char *name) {
     bool found = false;
     int index = -1;
     
     for(int i=0;i<NUM_LIGHTS && !found;++i) {
         if (strcmp(this->m_lights[i]->getName(),name) == 0) {
             found = true;
             index = i;
         }
     }
     
     return index;
 }
 
 // get a specific resources
 ResourceFactory *MBEDEndpoint::getResources(int index) {
     if (index >= 0 && index < NUM_LIGHTS) return this->m_lights[index]->resources();
     return NULL;
 }
 
 // initialize our ResourceFactory
 ResourceFactory *MBEDEndpoint::initResourceFactory() { return new EmulatedResourceFactory(this->logger(),(void *)this); }
 
 // Initialize the Endpoint Name - will be the first Light resource name (and there must be one...)
 void MBEDEndpoint::initEndpointName() {
     this->m_instance_id = this->preferences()->getIntPreference("endpoint_id",LIGHT_NAME_INDEX);
     memset(this->m_endpoint_name,0,LIGHT_NAME_LEN+1);
     sprintf(this->m_endpoint_name,LIGHT_NAME,this->m_instance_id);
 }
 
 // get our endpoint name
 char *MBEDEndpoint::getEndpointName() { return this->m_endpoint_name; }
 
 // get our instance id
 int MBEDEndpoint::getInstanceID() { return this->m_instance_id; }
 
 // initialize a specific transport
 bool MBEDEndpoint::initializeTransport(int index,char *key,Transport *transport) {
     bool success = false;
     if (this->m_transports[index] == NULL) {
          this->logger()->log("Initializing %s Transport...", key);
          this->m_transports[index] = transport;
          if (this->m_transports[index] != NULL) success = this->m_transports[index]->connect();
          if (success) this->logger()->log("Transport %s initialized and connected",key);
      }
      else {
          this->logger()->log("%s already connected (OK)...", key);
          success = true;
      }
      return success;
 }
 
 // initialize our transports
 bool MBEDEndpoint::initializeTransports() {
      bool success = true;
      
      if (success == true) {
        // MQTT Initialization
        success = this->initializeTransport(MQTT_TRANSPORT,"MQTT",new MQTTTransport(this->m_error_handler,this,this->getMap()));
      }
      
      if (success == true) {
          // HTTP Initialization
          success = this->initializeTransport(HTTP_TRANSPORT,"HTTP",new IOCHTTPTransport(this->m_error_handler,this));
      }
      return success;
 }
 
 // initialize our Ethernet 
 bool MBEDEndpoint::initializeEthernet(EthernetInterface *ethernet) {
     bool success = false;
     this->m_ethernet = ethernet;
     if (this->m_ethernet != NULL) {
         this->logger()->log("Initializing Ethernet...");
         
         // connect up ethernet
         this->m_ethernet->init();
         this->m_ethernet->connect();
         
         // display our IP address
         char *ipaddr = this->m_ethernet->getIPAddress();
         if (ipaddr != NULL && strlen(ipaddr) > 0) {
            this->logger()->log("IPAddress: %s",this->m_ethernet->getIPAddress());
            success = true;
         }
         else {
            this->logger()->log("Ethernet Not Connected...");
            success = false;
         }
     }
     else {
         this->logger()->log("No Ethernet instance found");
         success = false;
     }
     return success;
 }
 
 // load up all endpoints into the IOC
 bool MBEDEndpoint::loadEndpoints() {
     bool success = true;
     this->logger()->log("Loading All Endpoints to IOC...");
     for(int i=0;i<NUM_LIGHTS && success;++i) success = this->loadEndpoint(this->m_lights[i]);
     return success;
 }
 
 // load up our endpoint to the IOC
 bool MBEDEndpoint::loadEndpoint(Light *light) {      
     bool success = false;
     char result[IOC_RESULT_LEN+1];
     char payload[IOC_PAYLOAD_LEN+1];
     
     // initialize
     memset(result,0,IOC_RESULT_LEN+1);
     memset(payload,0,IOC_PAYLOAD_LEN+1);
     
     // DEBUG
     this->logger()->log("Building Payload for Light: %s...",light->getName());
          
     // build the payload
     char *data = this->buildIOCPayload(payload,IOC_PAYLOAD_LEN,light);
      
     // issue the request
     if (data != NULL && strlen(data) > 0) {
        // DEBUG
        this->logger()->log("Sending Light: %s to the IOC...",light->getName());
     
        // load
        success = this->m_transports[LOAD_TRANSPORT]->loadEndpoint((char *)payload,strlen(payload),(char *)result,IOC_RESULT_LEN);
     }
     
     // DEBUG
     //if (success) this->logger()->log("Saving IOC ID for Light: %s...",light->getName());
     
     // update the IOC ID if found
     if (success) this->saveIOCID(light,result);
     
     // DEBUG
     if (success) this->logger()->log("Light: %s IOC ID=%d sent successfully",light->getName(),light->getIOCID());
     
     // DEBUG
     if (!success) {
         if (light != NULL) this->logger()->log("Light: %s send FAILED",light->getName());
         else this->logger()->log("Light: send FAILED (NULL LIGHT)");
     }
     
     // return our status
     return success;
 }
 
 // update all endpoints to the IOC
 bool MBEDEndpoint::updateEndpoints() {
     bool success = true;
     for(int i=0;i<NUM_LIGHTS && success;++i) success = this->updateEndpoints(i);
     return success;
 }
 
 // update all endpoints to the IOC
 bool MBEDEndpoint::updateEndpoints(int index) {
     if (index >= 0 && index < NUM_LIGHTS) return this->updateEndpoint(this->m_lights[index]);
     return false; 
 }
 
 // update our endpoint with the IOC
 bool MBEDEndpoint::updateEndpoint(Light *light) { 
     bool success = false;
     char result[IOC_RESULT_LEN+1];
     char payload[IOC_PAYLOAD_LEN+1];
     
     // initialize
     memset(result,0,IOC_RESULT_LEN+1);
     memset(payload,0,IOC_PAYLOAD_LEN+1);
          
     // build the payload
     char *data = this->buildIOCPayload(payload,IOC_PAYLOAD_LEN,light);
     
     // issue the request  
     if (data != NULL && strlen(data) > 0) {
        // DEBUG
        this->logger()->log("Updating Light: %s at the IOC...",light->getName()); 
        
        // update
        success = this->m_transports[LOAD_TRANSPORT]->updateEndpoint(light->getIOCID(),(char *)payload,strlen(payload),(char *)result,IOC_RESULT_LEN);
     }
     
     // DEBUG
     if (success) this->logger()->log("Update of Endpoint to IOC successful");
     else this->logger()->log("Update of Endpoint to IOC FAILED");
          
     // return our status
     return success; 
 } 
 
 // build out the Payload
 char *MBEDEndpoint::buildIOCPayload(char *data,int data_length,Light *light) {
     char tmp[TEMP_BUFFER_LEN+1];
      
     // construct the payload for Load/Updates
     ResourceFactory *factory = light->getResourceFactory();
     
     // start the buffer
     strcat(data,"{");
     
     // loop through the resources and build a JSON representation for the payload
     for(int i=0;i<factory->numResources();++i) {
         // get the ith resource
         Resource *resource = factory->getResource(i);
         if (resource != NULL) {
             // add to the JSON payload
             char *name = this->getMap()->endpointNameToIOCName(resource->getName());
             char *value = resource->getValue();
             
             // make sure that we have a positive IOC resource match for the NSP resource 
             if (name != NULL && strlen(name) > 0) {
                 // Handle LOCATION a special way
                 if (strcmp(name,"LOCATION") != 0) {
                     // standard name,value for IOC
                     sprintf(tmp, "\"%s\":\"%s\",",name,value); 
                  }
                 else {
                     // IOC expects "Point(X,Y)" for LOCATION
                     sprintf(tmp, "\"%s\":\"Point(%s)\",",name,value); 
                 }   
                 strcat(data,tmp);
            
                 // Handle /dev/addldata 
                 char *dev_addldata = this->getMap()->endpointNameToIOCName("/dev/addldata");
                 if (dev_addldata != NULL && strcmp(name,dev_addldata) == 0 && light != NULL && light->getIOCID() > 0) {
                     char buf[IOC_IOC_ID_LEN+1]; memset(buf,0,IOC_IOC_ID_LEN+1); sprintf(buf,"%d",light->getIOCID());
                     sprintf(tmp,"\"%s\":\"id:%s\",",name,buf);
                     strcat(data,tmp);
                 }
             }
         }
     }
     
     // Special Case: STARTDATETIME
     strcat(data,ENDPOINT_STARTTIME);
     
     // Special Case: ENDDATETIME
     strcat(data,ENDPOINT_STOPTIME);
                
     // Special Case: NAME
     sprintf(tmp,"\"NAME\":\"%s\",",light->getName());
     strcat(data,tmp);
          
     // Special Case: TIMEZONEOFFSET
     strcat(data,ENDPOINT_TIMEZONE);
          
     // close
     strcat(data,"}");
     
     // DEBUG
     //this->logger()->log("Loading Payload: %s",data);
     
     // return the payload
     return data;
 }
  
 // save the IOC ID
 void MBEDEndpoint::saveIOCID(Light *light,char *json) {
     if (json != NULL) {          
         //this->logger()->log("RESULT: %s",json);
         
         // look for "id":
         char *check = "\"id\":";
         char *pos1 = strstr(json,check);
         if (pos1 != NULL) {
             char *pos2 = strstr(pos1,","); 
             if (pos1 != NULL && pos2 != NULL && pos2 > pos1) {
                 pos1 += strlen(check);
                 int length = pos2 - pos1;  
                 char str_ioc_id[IOC_IOC_ID_LEN+1];
                 memset(str_ioc_id,0,IOC_IOC_ID_LEN+1);
                 strncpy(str_ioc_id,pos1,length);
                 
                 // DEBUG
                 //this->logger()->log("IOC ID found: %s",str_ioc_id);
                 
                 // parse into int  
                 int ioc_id = 0;             
                 sscanf(str_ioc_id,"%d",&ioc_id);
                          
                 // save the IOC ID
                 if (ioc_id > 0) light->setIOCID(ioc_id);
             }
             else {
                 // cannot find the ID tag in the result JSON
                 this->logger()->log("Cannot find the IOC ID in the JSON result");
                 this->logger()->log("JSON: %s",json);
             }
         }
         else {
             // cannot find the ID tag in the result JSON
             this->logger()->log("Cannot find the IOC ID in the JSON result");
             this->logger()->log("JSON: %s",json);
        }
     }
 }
 
 // close down the Lights
 bool MBEDEndpoint::closeLights() {
    bool success = true;
    this->logger()->log("Closing down Lights...");
    for(int i=0;i<NUM_LIGHTS;++i)
        if (this->m_lights[i] != NULL) delete this->m_lights[i];
    return success;
 }
 
 // close a given transport
 bool MBEDEndpoint::closeTransport(int index,char *key) {
    this->logger()->log("Closing down %s Transport...", key);
    if (this->m_transports[index] != NULL) delete this->m_transports[index];
    return true;
 }
 
 // close down our transports
 bool MBEDEndpoint::closeTransports() {
     bool success = true;
     
     if (success) {
         // close MQTT
         success = this->closeTransport(MQTT_TRANSPORT,"MQTT");
     }
     
     if (success) {
         // close HTTP
         success = this->closeTransport(HTTP_TRANSPORT,"HTTP");
     }
     
     return success;
 }
 
 // close down our Ethernet 
 bool MBEDEndpoint::closeEthernet() {
     this->logger()->log("Closing down Ethernet...");
     if (this->m_ethernet != NULL) this->m_ethernet->disconnect();
     return true;
 }
 
 // min function
 int MBEDEndpoint::min(int value1,int value2) {
    if (value1 < value2) return value1;
    return value2;
 }
 
 // get our error handler
 ErrorHandler *MBEDEndpoint::logger() { return this->m_error_handler; }
 
 // main running loop
 void MBEDEndpoint::run() {
     this->logger()->log("Endpoint Main Loop");
     while(true) {
         // sleep a bit
         //this->logger()->log("Sleeping for a bit...");
         wait_ms(MAIN_LOOP_SLEEP);
         
         // check for events 
         //this->logger()->log("Processing Events...");
         for(int i=0;i<NUM_TRANSPORTS;++i) this->m_transports[i]->checkAndProcess();
         
         // check for exit
         //this->logger()->log("Checking for exit...");
         this->logger()->checkForExit();
     }
}