/****************************************************************************
 * This file is part of the project AqHome.
 * AqHome (c) by 2024 Martin Preuss, all rights reserved.
 *
 * The license for this file can be found in the file COPYING which you
 * should have received along with this file.
 ****************************************************************************/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "./net_read.h"
#include "aqhome-react/types/unit.h"
#include "aqhome-react/types/unitnet.h"

#include "aqhome/aqhome.h"

#include <gwenhywfar/xml.h>
#include <gwenhywfar/text.h>
#include <gwenhywfar/debug.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>



/* ------------------------------------------------------------------------------------------------
 * forward declarations
 * ------------------------------------------------------------------------------------------------
 */

static time_t _getNewestFiletimeFromFileList(const AQHOME_REACT *aqh, const GWEN_STRINGLIST *sl);
static AQHREACT_UNIT_NET_LIST *_readUnitNetFiles(AQHOME_REACT *aqh, const GWEN_STRINGLIST *sl);
static int _readAllNetworksFromFileIntoList(AQHOME_REACT *aqh, const char *sFilename, AQHREACT_UNIT_NET_LIST *unitNetList);
static GWEN_XMLNODE *_readNetworkFromSysconfIntoXml(AQHOME_REACT *aqh, const char *networkName);
static AQHREACT_UNIT_NET *_readUnitNetFromXml(AQHOME_REACT *aqh, GWEN_XMLNODE *unitNetNode);
static GWEN_XMLNODE *_readUnitNetFileToXml(AQHOME_REACT *aqh, const char *sFilename);
static void _readNetParamDefsWithList(AQHREACT_PARAM_LIST *paramList, GWEN_XMLNODE *unitNetNode);
static int _readUnits(AQHOME_REACT *aqh, AQHREACT_UNIT_NET *unitNet, GWEN_XMLNODE *unitNetNode);
static int _readLinks(AQHOME_REACT *aqh, AQHREACT_UNIT_NET *unitNet, GWEN_XMLNODE *unitNetNode);
static AQHREACT_UNIT *_readUnit(AQHOME_REACT *aqh, GWEN_XMLNODE *unitNode);
static int _readParamValuesForList(const AQHREACT_PARAM_LIST *paramList, GWEN_XMLNODE *parentNode);
static int _readParamValueForList(const AQHREACT_PARAM_LIST *paramList, GWEN_XMLNODE *paramNode);
static AQHREACT_PARAM *_readNetParamDef(GWEN_XMLNODE *paramNode);
static int _readLink(AQHOME_REACT *aqh, AQHREACT_UNIT_NET *unitNet, GWEN_XMLNODE *linkNode);
static int _setParamDoubleValueFromString(AQHREACT_PARAM *param, const char *s);



/* ------------------------------------------------------------------------------------------------
 * implementations
 * ------------------------------------------------------------------------------------------------
 */


time_t AQHomeReact_GetNewestUnitNetFiletime(const AQHOME_REACT *aqh)
{
  GWEN_STRINGLIST *sl;
  time_t t1;
  time_t t2;

  sl=AQH_GetListOfMatchingDataFiles("aqhome/react/networks", "*.xml");
  t1=_getNewestFiletimeFromFileList(aqh, sl);
  GWEN_StringList_free(sl);

  sl=AQH_GetListOfMatchingSysconfFiles("aqhome/react/networks", "*.xml");
  t2=_getNewestFiletimeFromFileList(aqh, sl);
  GWEN_StringList_free(sl);

  return (t1>t2)?t1:t2;
}



AQHREACT_UNIT_NET_LIST *AQHomeReact_ReadUnitNetFiles(AQHOME_REACT *aqh)
{
  GWEN_STRINGLIST *sl;

  sl=AQH_GetListOfMatchingDataFiles("aqhome/react/networks", "*.xml");
  if (sl) {
    AQHREACT_UNIT_NET_LIST *unitNetList;

    unitNetList=_readUnitNetFiles(aqh, sl);
    GWEN_StringList_free(sl);
    if (unitNetList==NULL) {
      DBG_INFO(NULL, "Error reading unit network files");
      return NULL;
    }
    return unitNetList;
  }
  else {
    DBG_ERROR(NULL, "No unit network files");
    return NULL;
  }
}



time_t _getNewestFiletimeFromFileList(const AQHOME_REACT *aqh, const GWEN_STRINGLIST *sl)
{
  time_t resultTime=0;

  if (sl) {
    GWEN_STRINGLISTENTRY *se;
  
    se=GWEN_StringList_FirstEntry(sl);
    while(se) {
      const char *s;

      s=GWEN_StringListEntry_Data(se);
      if (s && *s) {
        struct stat sb;

        if (stat(s, &sb)==0) {
          time_t t;

          t=sb.st_mtim.tv_sec;
          if (t>resultTime)
            resultTime=t;
        }
        else {
          DBG_WARN(NULL, "Error on stat(%s): %s (%d)", s, strerror(errno), errno);
        }
      }
      se=GWEN_StringListEntry_Next(se);
    }
  }
  return resultTime;
}



GWEN_XMLNODE *_readNetworkFromSysconfIntoXml(AQHOME_REACT *aqh, const char *networkName)
{
  GWEN_XMLNODE *n;
  GWEN_BUFFER *bufFilename;
  GWEN_BUFFER *bufPath;

  bufFilename=GWEN_Buffer_new(0, 256, 0, 1);
  GWEN_Buffer_AppendString(bufFilename, "aqhome/react/networks/");
  GWEN_Buffer_AppendString(bufFilename, networkName);
  GWEN_Buffer_AppendString(bufFilename, ".xml");

  bufPath=AQH_FindPathOfSysconfFile(GWEN_Buffer_GetStart(bufFilename));
  if (bufPath==NULL) {
    DBG_ERROR(NULL, "Network file \"%s\" not found in sysconf folders", GWEN_Buffer_GetStart(bufFilename));
    GWEN_Buffer_free(bufFilename);
    return NULL;
  }
  GWEN_Buffer_free(bufFilename);

  n=_readUnitNetFileToXml(aqh, GWEN_Buffer_GetStart(bufPath));
  if (n==NULL) {
    DBG_ERROR(NULL, "Error reading network file \"%s\" from sysconf dir", GWEN_Buffer_GetStart(bufPath));
    GWEN_Buffer_free(bufPath);
    return NULL;
  }
  GWEN_Buffer_free(bufPath);
  return n;
}



AQHREACT_UNIT_NET_LIST *_readUnitNetFiles(AQHOME_REACT *aqh, const GWEN_STRINGLIST *sl)
{
  GWEN_STRINGLISTENTRY *se;
  AQHREACT_UNIT_NET_LIST *unitNetList;

  unitNetList=AQHREACT_UnitNet_List_new();
  se=GWEN_StringList_FirstEntry(sl);
  while(se) {
    const char *s;

    s=GWEN_StringListEntry_Data(se);
    if (s && *s) {
      int rv;

      DBG_INFO(NULL, "Reading unit network file \"%s\"", s);
      rv=_readAllNetworksFromFileIntoList(aqh, s, unitNetList);
      if (rv<0 && rv!=GWEN_ERROR_NO_DATA) {
        DBG_WARN(NULL, "Error reading unit network file \"%s\" (%d), ignoring", s, rv);
      }
    }
    se=GWEN_StringListEntry_Next(se);
  }

  if (AQHREACT_UnitNet_List_GetCount(unitNetList)<1) {
    AQHREACT_UnitNet_List_free(unitNetList);
    return NULL;
  }

  return unitNetList;
}



int _readAllNetworksFromFileIntoList(AQHOME_REACT *aqh, const char *sFilename, AQHREACT_UNIT_NET_LIST *unitNetList)
{
  GWEN_XMLNODE *rootNode;
  GWEN_XMLNODE *netListNode;
  GWEN_XMLNODE *netNode;
  int rv;

  rootNode=GWEN_XMLNode_new(GWEN_XMLNodeTypeTag, NULL);
  rv=GWEN_XML_ReadFile(rootNode, sFilename, GWEN_XML_FLAGS_DEFAULT);
  if (rv<0) {
    DBG_ERROR(NULL, "Error reading XML file \"%s\": %d", sFilename, rv);
    GWEN_XMLNode_free(rootNode);
    return rv;
  }

  netListNode=GWEN_XMLNode_FindFirstTag(rootNode, "networks", NULL, NULL);
  if (netListNode==NULL)
    netListNode=rootNode;

  netNode=GWEN_XMLNode_FindFirstTag(netListNode, "network", NULL, NULL);
  while(netNode) {
    AQHREACT_UNIT_NET *unitNet;

    unitNet=_readUnitNetFromXml(aqh, netNode);
    if (unitNet)
      AQHREACT_UnitNet_List_Add(unitNet, unitNetList);
    else {
      DBG_ERROR(NULL, "Error loading network from file \"%s\", ignoring.", sFilename);
    }
    netNode=GWEN_XMLNode_FindNextTag(netNode, "network", NULL, NULL);
  }

  return 0;
}



AQHREACT_UNIT_NET *_readUnitNetFromXml(AQHOME_REACT *aqh, GWEN_XMLNODE *unitNetNode)
{
  AQHREACT_UNIT_NET *unitNet;
  const char *s;
  int rv;

  unitNet=AQHREACT_UnitNet_new();
  s=GWEN_XMLNode_GetProperty(unitNetNode, "id", NULL);
  AQHREACT_UnitNet_SetName(unitNet, s);

  s=GWEN_XMLNode_GetProperty(unitNetNode, "type", NULL);
  if (s && *s) {
    GWEN_XMLNODE *baseNetXml;

    /* uses a template file, load that and only set params from non-template file */
    DBG_INFO(NULL, "Loading base network \"%s\"", s);
    baseNetXml=_readNetworkFromSysconfIntoXml(aqh, s);
    if (baseNetXml==NULL) {
      DBG_ERROR(NULL, "Base network \"%s\" not available (error or missing)", s);
      AQHREACT_UnitNet_free(unitNet);
      return NULL;
    }
    _readNetParamDefsWithList(AQHREACT_UnitNet_GetParamList(unitNet), baseNetXml);

    /* also read netParams from this file (after reading from template) */
    rv=_readParamValuesForList(AQHREACT_UnitNet_GetParamList(unitNet), unitNetNode);
    if (rv<0) {
      DBG_INFO(NULL, "here (%d)", rv);
      AQHREACT_UnitNet_free(unitNet);
      GWEN_XMLNode_free(baseNetXml);
      return NULL;
    }

    rv=_readUnits(aqh, unitNet, baseNetXml);
    if (rv<0) {
      DBG_INFO(NULL, "here (%d)", rv);
      AQHREACT_UnitNet_free(unitNet);
      GWEN_XMLNode_free(baseNetXml);
      return NULL;
    }

    rv=_readLinks(aqh, unitNet, baseNetXml);
    if (rv<0) {
      DBG_INFO(NULL, "here (%d)", rv);
      AQHREACT_UnitNet_free(unitNet);
      GWEN_XMLNode_free(baseNetXml);
      return NULL;
    }
    GWEN_XMLNode_free(baseNetXml);
  }
  else {
    /* just directly read network from given XML node (no need to load a template file) */
    _readNetParamDefsWithList(AQHREACT_UnitNet_GetParamList(unitNet), unitNetNode);

    rv=_readUnits(aqh, unitNet, unitNetNode);
    if (rv<0) {
      DBG_INFO(NULL, "here (%d)", rv);
      AQHREACT_UnitNet_free(unitNet);
      return NULL;
    }

    rv=_readLinks(aqh, unitNet, unitNetNode);
    if (rv<0) {
      DBG_INFO(NULL, "here (%d)", rv);
      AQHREACT_UnitNet_free(unitNet);
      return NULL;
    }
  }

  return unitNet;
}



GWEN_XMLNODE *_readUnitNetFileToXml(AQHOME_REACT *aqh, const char *sFilename)
{
  GWEN_XMLNODE *rootNode;
  GWEN_XMLNODE *netNode;
  int rv;

  rootNode=GWEN_XMLNode_new(GWEN_XMLNodeTypeTag, NULL);
  rv=GWEN_XML_ReadFile(rootNode, sFilename, GWEN_XML_FLAGS_DEFAULT);
  if (rv<0) {
    DBG_ERROR(NULL, "Error reading XML file \"%s\": %d", sFilename, rv);
    GWEN_XMLNode_free(rootNode);
    return NULL;
  }

  netNode=GWEN_XMLNode_FindFirstTag(rootNode, "network", NULL, NULL);
  if (netNode) {
    GWEN_XMLNode_UnlinkChild(rootNode, netNode);
    GWEN_XMLNode_free(rootNode);
    return netNode;
  }
  else {
    DBG_ERROR(NULL, "No \"network\" element in network file \"%s\"", sFilename);
    return NULL;
  }
}



int _readUnits(AQHOME_REACT *aqh, AQHREACT_UNIT_NET *unitNet, GWEN_XMLNODE *unitNetNode)
{
  GWEN_XMLNODE *nGroup;

  nGroup=GWEN_XMLNode_FindFirstTag(unitNetNode, "units", NULL, NULL);
  if (nGroup) {
    GWEN_XMLNODE *n;

    n=GWEN_XMLNode_FindFirstTag(nGroup, "unit", NULL, NULL);
    while(n) {
      AQHREACT_UNIT *unit;

      unit=_readUnit(aqh, n);
      if (unit)
        AQHREACT_UnitNet_AddUnit(unitNet, unit);
      else {
        DBG_ERROR(NULL, "Error reading unit in net \"%s\"", AQHREACT_UnitNet_GetName(unitNet));
        return GWEN_ERROR_BAD_DATA;
      }
      n=GWEN_XMLNode_FindNextTag(n, "unit", NULL, NULL);
    }
  }

  return 0;
}



int _readLinks(AQHOME_REACT *aqh, AQHREACT_UNIT_NET *unitNet, GWEN_XMLNODE *unitNetNode)
{
  GWEN_XMLNODE *nGroup;

  nGroup=GWEN_XMLNode_FindFirstTag(unitNetNode, "links", NULL, NULL);
  if (nGroup) {
    GWEN_XMLNODE *n;

    n=GWEN_XMLNode_FindFirstTag(nGroup, "link", NULL, NULL);
    while(n) {
      int rv;

      rv=_readLink(aqh, unitNet, n);
      if (rv<0) {
        DBG_ERROR(NULL, "Error reading link in net \"%s\" (%d)", AQHREACT_UnitNet_GetName(unitNet), rv);
        return GWEN_ERROR_BAD_DATA;
      }
      n=GWEN_XMLNode_FindNextTag(n, "link", NULL, NULL);
    }
  }
  return 0;
}



AQHREACT_UNIT *_readUnit(AQHOME_REACT *aqh, GWEN_XMLNODE *unitNode)
{
  AQHREACT_UNIT *unit;
  const char *unitType;
  const char *unitId;
  int rv;

  unitType=GWEN_XMLNode_GetProperty(unitNode, "type", NULL);
  if (!(unitType && *unitType)) {
    DBG_ERROR(NULL, "No type name in unit node");
    return NULL;
  }
  unit=AqHomeReact_CreateUnitByName(aqh, unitType);

  unitId=GWEN_XMLNode_GetProperty(unitNode, "id", NULL);
  AQHREACT_Unit_SetId(unit, unitId);

  rv=_readParamValuesForList(AQHREACT_Unit_GetParamList(unit), unitNode);
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    AQHREACT_Unit_free(unit);
    return NULL;
  }

  return unit;
}



int _readParamValuesForList(const AQHREACT_PARAM_LIST *paramList, GWEN_XMLNODE *parentNode)
{
  GWEN_XMLNODE *nGroup;

  nGroup=GWEN_XMLNode_FindFirstTag(parentNode, "params", NULL, NULL);
  if (nGroup) {
    GWEN_XMLNODE *n;

    n=GWEN_XMLNode_FindFirstTag(nGroup, "param", NULL, NULL);
    while(n) {
      int rv;

      rv=_readParamValueForList(paramList, n);
      if (rv<0) {
        DBG_INFO(NULL, "here (%d)", rv);
        return rv;
      }
      n=GWEN_XMLNode_FindNextTag(n, "param", NULL, NULL);
    }
  }
  return 0;
}



int _readParamValueForList(const AQHREACT_PARAM_LIST *paramList, GWEN_XMLNODE *paramNode)
{
  const char *paramName;
  
  paramName=GWEN_XMLNode_GetProperty(paramNode, "name", NULL);
  if (paramName && *paramName) {
    AQHREACT_PARAM *param;
  
    param=AQHREACT_Param_List_GetParamByName(paramList, paramName);
    if (param) {
      const char *value;
  
      value=GWEN_XMLNode_GetCharValue(paramNode, NULL, NULL);
      if (value && *value) {
        int dataType;
  
        dataType=AQHREACT_Param_GetDataType(param);
        switch(dataType) {
        case AQHREACT_DATAOBJECTTYPE_DOUBLE:
          {
            int rv;
            double valueAsDouble;
  
            rv=GWEN_Text_StringToDouble(value, &valueAsDouble);
            if (rv<0) {
              DBG_ERROR(NULL, "Not a DOUBLE value for param %s in list [%s]", paramName, value);
              return rv;
            }
            AQHREACT_Param_SetDoubleValue(param, valueAsDouble);
            break;
          }
        case AQHREACT_DATAOBJECTTYPE_STRING:
        default:
          AQHREACT_Param_SetStringValue(param, value);
          break;
        }
      }
    }
    else {
      DBG_ERROR(NULL, "No param name \"%s\" in list", paramName);
      return GWEN_ERROR_BAD_DATA;
    }
  }

  return 0;
}



void _readNetParamDefsWithList(AQHREACT_PARAM_LIST *paramList, GWEN_XMLNODE *unitNetNode)
{
  GWEN_XMLNODE *nGroup;

  nGroup=GWEN_XMLNode_FindFirstTag(unitNetNode, "params", NULL, NULL);
  if (nGroup) {
    GWEN_XMLNODE *n;

    n=GWEN_XMLNode_FindFirstTag(nGroup, "param", NULL, NULL);
    while(n) {
      AQHREACT_PARAM *param;

      param=_readNetParamDef(n);
      if (param)
        AQHREACT_Param_List_Add(param, paramList);
      n=GWEN_XMLNode_FindNextTag(n, "param", NULL, NULL);
    }
  }
}



AQHREACT_PARAM *_readNetParamDef(GWEN_XMLNODE *paramNode)
{
  const char *paramName;
  const char *paramType;
  const char *paramValue;
  
  paramName=GWEN_XMLNode_GetProperty(paramNode, "name", NULL);
  paramType=GWEN_XMLNode_GetProperty(paramNode, "type", "string");
  paramValue=GWEN_XMLNode_GetCharValue(paramNode, NULL, NULL);

  if (paramName && *paramName) {
    int t=AQHREACT_DATAOBJECTTYPE_STRING;
    AQHREACT_PARAM *param;

    if (paramType) {
      if (strcasecmp(paramType, "string")==0)
        t=AQHREACT_DATAOBJECTTYPE_STRING;
      else if (strcasecmp(paramType, "double")==0)
        t=AQHREACT_DATAOBJECTTYPE_DOUBLE;
      else {
        DBG_ERROR(NULL, "Invalid data type in parameter (%s), assuming string", paramType);
        t=AQHREACT_DATAOBJECTTYPE_STRING;
      }
    }

    param=AQHREACT_Param_new();
    AQHREACT_Param_SetName(param, paramName);
    AQHREACT_Param_SetDataType(param, t);
    if (paramValue && *paramValue) {
      int rv;

      switch(t) {
      case AQHREACT_DATAOBJECTTYPE_STRING:
        AQHREACT_Param_SetStringValue(param, paramValue);
        break;
      case AQHREACT_DATAOBJECTTYPE_DOUBLE:
        rv=_setParamDoubleValueFromString(param, paramValue);
        if (rv<0) {
          DBG_INFO(NULL, "here (%d)", rv);
          AQHREACT_Param_free(param);
          return NULL;
        }
        break;
      default:
        break;
      }
    }

    return param;
  }

  return NULL;
}



int _setParamDoubleValueFromString(AQHREACT_PARAM *param, const char *s)
{
  int rv;
  double value;

  rv=GWEN_Text_StringToDouble(s, &value);
  if (rv<0) {
    DBG_INFO(NULL, "here (%d)", rv);
    return rv;
  }
  AQHREACT_Param_SetDoubleValue(param, value);
  return 0;
}



int _readLink(AQHOME_REACT *aqh, AQHREACT_UNIT_NET *unitNet, GWEN_XMLNODE *linkNode)
{
  const char *sourceUnitName;
  const char *sourceSlotName;
  const char *targetUnitName;
  const char *targetSlotName;
  AQHREACT_UNIT *sourceUnit;
  AQHREACT_UNIT *targetUnit;
  AQHREACT_INPUT_SLOT *inputSlot;
  AQHREACT_OUTPUT_SLOT *outputSlot;
  AQHREACT_LINK *link;

  sourceUnitName=GWEN_XMLNode_GetProperty(linkNode, "sourceUnit", NULL);
  sourceSlotName=GWEN_XMLNode_GetProperty(linkNode, "sourceSlot", NULL);
  targetUnitName=GWEN_XMLNode_GetProperty(linkNode, "targetUnit", NULL);
  targetSlotName=GWEN_XMLNode_GetProperty(linkNode, "targetSlot", NULL);

  if (!(sourceUnitName && *sourceUnitName && sourceSlotName && *sourceSlotName &&
        targetUnitName && *targetUnitName && targetSlotName && *targetSlotName)) {
    DBG_ERROR(NULL,
              "Link in net \"%s\" needs properties sourceUnit, sourceSlot, targetUnit and targetSlot",
              AQHREACT_UnitNet_GetName(unitNet));
    return GWEN_ERROR_BAD_DATA;
  }

  sourceUnit=AQHREACT_UnitNet_GetUnitById(unitNet, sourceUnitName);
  if (sourceUnit==NULL)
    sourceUnit=AqHomeReact_FindUnitByNetNameAndUnitId(aqh, NULL, sourceUnitName);
  if (sourceUnit==NULL) {
    DBG_ERROR(NULL, "Source unit \"%s\" not found", sourceUnitName);
    return GWEN_ERROR_NOT_FOUND;
  }
  outputSlot=AQHREACT_Unit_GetOutputSlotByName(sourceUnit, sourceSlotName);
  if (outputSlot==NULL) {
    DBG_ERROR(NULL, "Output slot \"%s\" not found for source unit \"%s\"", sourceSlotName, sourceUnitName);
    return GWEN_ERROR_NOT_FOUND;
  }

  targetUnit=AQHREACT_UnitNet_GetUnitById(unitNet, targetUnitName);
  if (targetUnit==NULL)
    targetUnit=AqHomeReact_FindUnitByNetNameAndUnitId(aqh, NULL, targetUnitName);
  if (targetUnit==NULL) {
    DBG_ERROR(NULL, "Target unit \"%s\" not found", targetUnitName);
    return GWEN_ERROR_NOT_FOUND;
  }
  inputSlot=AQHREACT_Unit_GetOrCreateUnusedInputSlotByName(targetUnit, targetSlotName);
  if (inputSlot==NULL) {
    DBG_ERROR(NULL, "Input slot \"%s\" not found for target unit \"%s\"", targetSlotName, targetUnitName);
    return GWEN_ERROR_NOT_FOUND;
  }

  link=AQHREACT_Link_new();
  AQHREACT_Link_SetTargetUnitId(link, targetUnitName);
  AQHREACT_Link_SetTargetUnit(link, targetUnit);
  AQHREACT_Link_SetTargetInputSlotIdForUnit(link, AQHREACT_InputSlot_GetIdForUnit(inputSlot));
  AQHREACT_OutputSlot_AddLink(outputSlot, link);
  return 0;
}