/*
 * Smithsonian Astrophysical Observatory, Cambridge, MA, USA
 * This code has been modified under the terms listed below and is made
 * available under the same terms.
 */

/*
 *	Copyright 1991-2004 George A Howlett.
 *
 *	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 <string.h>

#include "tkbltGraph.h"
#include "tkbltGraphLine.h"
#include "tkbltGraphBar.h"
#include "tkbltGraphOp.h"

#include "tkbltGrAxis.h"
#include "tkbltGrAxisOp.h"
#include "tkbltGrElem.h"
#include "tkbltGrElemOp.h"
#include "tkbltGrHairs.h"
#include "tkbltGrHairsOp.h"
#include "tkbltGrLegd.h"
#include "tkbltGrLegdOp.h"
#include "tkbltGrMarker.h"
#include "tkbltGrMarkerOp.h"
#include "tkbltGrPostscript.h"
#include "tkbltGrPostscriptOp.h"
#include "tkbltGrPen.h"
#include "tkbltGrPenOp.h"
#include "tkbltGrXAxisOp.h"

using namespace Blt;

static Tcl_ObjCmdProc BarchartObjCmd;
static Tcl_ObjCmdProc GraphObjCmd;

static Axis* GetFirstAxis(Chain* chain);

int GraphObjConfigure(Graph* graphPtr, Tcl_Interp* interp,
		      int objc, Tcl_Obj* const objv[])
{
  Tk_SavedOptions savedOptions;
  int mask =0;
  int error;
  Tcl_Obj* errorResult;

  for (error=0; error<=1; error++) {
    if (!error) {
      if (Tk_SetOptions(interp, (char*)graphPtr->ops_, graphPtr->optionTable_, 
			objc, objv, graphPtr->tkwin_, &savedOptions, &mask)
	  != TCL_OK)
	continue;
    }
    else {
      errorResult = Tcl_GetObjResult(interp);
      Tcl_IncrRefCount(errorResult);
      Tk_RestoreSavedOptions(&savedOptions);
    }

    if (graphPtr->configure() != TCL_OK)
      return TCL_ERROR;
    graphPtr->flags |= mask;
    graphPtr->eventuallyRedraw();

    break; 
  }

  if (!error) {
    Tk_FreeSavedOptions(&savedOptions);
    return TCL_OK;
  }
  else {
    Tcl_SetObjResult(interp, errorResult);
    Tcl_DecrRefCount(errorResult);
    return TCL_ERROR;
  }
}

static int CgetOp(ClientData clientData, Tcl_Interp* interp, 
		  int objc, Tcl_Obj* const objv[])
{
  Graph* graphPtr = (Graph*)clientData;
  if (objc != 3) {
    Tcl_WrongNumArgs(interp, 1, objv, "cget option");
    return TCL_ERROR;
  }
  Tcl_Obj* objPtr = Tk_GetOptionValue(interp, 
				      (char*)graphPtr->ops_, 
				      graphPtr->optionTable_,
				      objv[2], graphPtr->tkwin_);
  if (objPtr == NULL)
    return TCL_ERROR;
  else
    Tcl_SetObjResult(interp, objPtr);
  return TCL_OK;
}

static int ConfigureOp(ClientData clientData, Tcl_Interp* interp, 
		       int objc, Tcl_Obj* const objv[])
{
  Graph* graphPtr = (Graph*)clientData;
  if (objc <= 3) {
    Tcl_Obj* objPtr = Tk_GetOptionInfo(interp, (char*)graphPtr->ops_, 
				       graphPtr->optionTable_, 
				       (objc == 3) ? objv[2] : NULL, 
				       graphPtr->tkwin_);
    if (objPtr == NULL)
      return TCL_ERROR;
    else
      Tcl_SetObjResult(interp, objPtr);
    return TCL_OK;
  } 
  else
    return GraphObjConfigure(graphPtr, interp, objc-2, objv+2);
}

/*
 *---------------------------------------------------------------------------
 *
 * ExtentsOp --
 *
 *	Reports the size of one of several items within the graph.  The
 *	following are valid items:
 *
 *	  "bottommargin"	Height of the bottom margin
 *	  "leftmargin"		Width of the left margin
 *	  "legend"		x y w h of the legend
 *	  "plotarea"		x y w h of the plotarea
 *	  "plotheight"		Height of the plot area
 *	  "rightmargin"		Width of the right margin
 *	  "topmargin"		Height of the top margin
 *        "plotwidth"		Width of the plot area
 *
 * Results:
 *	Always returns TCL_OK.
 *
 *---------------------------------------------------------------------------
 */

static int ExtentsOp(ClientData clientData, Tcl_Interp* interp,
		     int objc, Tcl_Obj* const objv[])
{
  Graph* graphPtr = (Graph*)clientData;
  GraphOptions* ops = (GraphOptions*)graphPtr->ops_;
  int length;
  const char* string = Tcl_GetStringFromObj(objv[2], &length);
  char c = string[0];
  if ((c == 'p') && (length > 4) && 
      (strncmp("plotheight", string, length) == 0)) {
    int height = graphPtr->bottom_ - graphPtr->top_ + 1;
    Tcl_SetIntObj(Tcl_GetObjResult(interp), height);
  }
  else if ((c == 'p') && (length > 4) &&
	     (strncmp("plotwidth", string, length) == 0)) {
    int width = graphPtr->right_ - graphPtr->left_ + 1;
    Tcl_SetIntObj(Tcl_GetObjResult(interp), width);
  }
  else if ((c == 'p') && (length > 4) &&
	     (strncmp("plotarea", string, length) == 0)) {
    Tcl_Obj* listObjPtr = Tcl_NewListObj(0, (Tcl_Obj **)NULL);
    Tcl_ListObjAppendElement(interp, listObjPtr, 
			     Tcl_NewIntObj(graphPtr->left_));
    Tcl_ListObjAppendElement(interp, listObjPtr, 
			     Tcl_NewIntObj(graphPtr->top_));
    Tcl_ListObjAppendElement(interp, listObjPtr, Tcl_NewIntObj(graphPtr->right_ - graphPtr->left_+1));
    Tcl_ListObjAppendElement(interp, listObjPtr, Tcl_NewIntObj(graphPtr->bottom_ - graphPtr->top_+1));
    Tcl_SetObjResult(interp, listObjPtr);
  }
  else if ((c == 'l') && (length > 2) &&
	     (strncmp("legend", string, length) == 0)) {
    Tcl_Obj* listObjPtr = Tcl_NewListObj(0, (Tcl_Obj **)NULL);
    Tcl_ListObjAppendElement(interp, listObjPtr, 
			     Tcl_NewIntObj(graphPtr->legend_->x_));
    Tcl_ListObjAppendElement(interp, listObjPtr, 
			     Tcl_NewIntObj(graphPtr->legend_->y_));
    Tcl_ListObjAppendElement(interp, listObjPtr, 
			     Tcl_NewIntObj(graphPtr->legend_->width_));
    Tcl_ListObjAppendElement(interp, listObjPtr, 
			     Tcl_NewIntObj(graphPtr->legend_->height_));
    Tcl_SetObjResult(interp, listObjPtr);
  }
  else if ((c == 'l') && (length > 2) &&
	   (strncmp("leftmargin", string, length) == 0)) {
    Tcl_SetIntObj(Tcl_GetObjResult(interp), ops->leftMargin.width);
  }
  else if ((c == 'r') && (length > 1) &&
	     (strncmp("rightmargin", string, length) == 0)) {
    Tcl_SetIntObj(Tcl_GetObjResult(interp), ops->rightMargin.width);
  }
  else if ((c == 't') && (length > 1) &&
	     (strncmp("topmargin", string, length) == 0)) {
    Tcl_SetIntObj(Tcl_GetObjResult(interp), ops->topMargin.height);
  }
  else if ((c == 'b') && (length > 1) &&
	     (strncmp("bottommargin", string, length) == 0)) {
    Tcl_SetIntObj(Tcl_GetObjResult(interp), ops->bottomMargin.height);
  }
  else {
    Tcl_AppendResult(interp, "bad extent item \"", objv[2],
		     "\": should be plotheight, plotwidth, leftmargin, rightmargin, \
topmargin, bottommargin, plotarea, or legend", (char*)NULL);
    return TCL_ERROR;
  }
  return TCL_OK;
}

static int InsideOp(ClientData clientData, Tcl_Interp* interp, int objc, 
		    Tcl_Obj* const objv[])
{
  if (objc != 4) {
    Tcl_WrongNumArgs(interp, 2, objv, "x y");
    return TCL_ERROR;
  }

  Graph* graphPtr = (Graph*)clientData;

  int x;
  if (Tcl_GetIntFromObj(interp, objv[2], &x) != TCL_OK)
    return TCL_ERROR;

  int y;
  if (Tcl_GetIntFromObj(interp, objv[3], &y) != TCL_OK)
    return TCL_ERROR;

  Region2d exts;
  graphPtr->extents(&exts);

  int result = (x<=exts.right && x>=exts.left && y<=exts.bottom && y>=exts.top);
  Tcl_SetBooleanObj(Tcl_GetObjResult(interp), result);

  return TCL_OK;
}

static int InvtransformOp(ClientData clientData, Tcl_Interp* interp, int objc, 
			  Tcl_Obj* const objv[])
{
  Graph* graphPtr = (Graph*)clientData;
  double x, y;
  if ((Tcl_GetDoubleFromObj(interp, objv[2], &x) != TCL_OK) ||
      (Tcl_GetDoubleFromObj(interp, objv[3], &y) != TCL_OK))
    return TCL_ERROR;

  if (graphPtr->flags & RESET)
    graphPtr->resetAxes();

  // Perform the reverse transformation, converting from window coordinates
  // to graph data coordinates.  Note that the point is always mapped to the
  // bottom and left axes (which may not be what the user wants)
  Axis* xAxis = GetFirstAxis(graphPtr->axisChain_[0]);
  Axis* yAxis = GetFirstAxis(graphPtr->axisChain_[1]);
  Point2d point = graphPtr->invMap2D(x, y, xAxis, yAxis);

  Tcl_Obj* listObjPtr = Tcl_NewListObj(0, (Tcl_Obj **)NULL);
  Tcl_ListObjAppendElement(interp, listObjPtr, Tcl_NewDoubleObj(point.x));
  Tcl_ListObjAppendElement(interp, listObjPtr, Tcl_NewDoubleObj(point.y));
  Tcl_SetObjResult(interp, listObjPtr);

  return TCL_OK;
}

static int TransformOp(ClientData clientData, Tcl_Interp* interp, int objc, 
		       Tcl_Obj* const objv[])
{
  Graph* graphPtr = (Graph*)clientData;
  double x, y;
  if ((Tcl_GetDoubleFromObj(interp, objv[2], &x) != TCL_OK) ||
      (Tcl_GetDoubleFromObj(interp, objv[3], &y) != TCL_OK))
    return TCL_ERROR;

  if (graphPtr->flags & RESET)
    graphPtr->resetAxes();

  // Perform the transformation from window to graph coordinates.  Note that
  // the points are always mapped onto the bottom and left axes (which may
  // not be the what the user wants
  Axis* xAxis = GetFirstAxis(graphPtr->axisChain_[0]);
  Axis* yAxis = GetFirstAxis(graphPtr->axisChain_[1]);

  Point2d point = graphPtr->map2D(x, y, xAxis, yAxis);

  Tcl_Obj* listObjPtr = Tcl_NewListObj(0, (Tcl_Obj **)NULL);
  Tcl_ListObjAppendElement(interp, listObjPtr, Tcl_NewIntObj((int)point.x));
  Tcl_ListObjAppendElement(interp, listObjPtr, Tcl_NewIntObj((int)point.y));
  Tcl_SetObjResult(interp, listObjPtr);

  return TCL_OK;
}

static const Ensemble graphEnsemble[] = {
  {"axis",        0, Blt::axisEnsemble},
  {"bar",         0, Blt::elementEnsemble},
  {"cget", 	  CgetOp, 0},
  {"configure",   ConfigureOp, 0},
  {"crosshairs",  0, Blt::crosshairsEnsemble},
  {"element",     0, Blt::elementEnsemble},
  {"extents",     ExtentsOp, 0},
  {"inside",      InsideOp, 0},
  {"invtransform",InvtransformOp, 0},
  {"legend",      0, Blt::legendEnsemble},
  {"line",        0, Blt::elementEnsemble},
  {"marker",      0, Blt::markerEnsemble},
  {"pen",         0, Blt::penEnsemble},
  {"postscript",  0, Blt::postscriptEnsemble},
  {"transform",   TransformOp, 0},
  {"xaxis",       0, Blt::xaxisEnsemble},
  {"yaxis",       0, Blt::xaxisEnsemble},
  {"x2axis",      0, Blt::xaxisEnsemble},
  {"y2axis",      0, Blt::xaxisEnsemble},
  { 0,0,0 }
};

// Support

static Axis* GetFirstAxis(Chain* chain)
{
  ChainLink* link = Chain_FirstLink(chain);
  if (!link)
    return NULL;

  return (Axis*)Chain_GetValue(link);
}

// Tk Interface

int Blt_GraphCmdInitProc(Tcl_Interp* interp)
{
  Tcl_Namespace* nsPtr = Tcl_FindNamespace(interp, "::blt", NULL, 
					   TCL_LEAVE_ERR_MSG);
  if (nsPtr == NULL)
    return TCL_ERROR;

  {
    const char* cmdPath = "::blt::graph";
    Tcl_Command cmdToken = Tcl_FindCommand(interp, cmdPath, NULL, 0);
    if (cmdToken)
      return TCL_OK;
    cmdToken = Tcl_CreateObjCommand(interp, cmdPath, GraphObjCmd, NULL, NULL);
    if (Tcl_Export(interp, nsPtr, "graph", 0) != TCL_OK)
      return TCL_ERROR;
  }

  {
    const char* cmdPath = "::blt::barchart";
    Tcl_Command cmdToken = Tcl_FindCommand(interp, cmdPath, NULL, 0);
    if (cmdToken)
      return TCL_OK;
    cmdToken = Tcl_CreateObjCommand(interp, cmdPath, BarchartObjCmd, NULL,NULL);
    if (Tcl_Export(interp, nsPtr, "barchart", 0) != TCL_OK)
      return TCL_ERROR;
  }

  return TCL_OK;
}

static int GraphObjCmd(ClientData clientData, Tcl_Interp* interp, int objc, 
		       Tcl_Obj* const objv[])
{
  if (objc < 2) {
    Tcl_WrongNumArgs(interp, 1, objv, "pathName ?options?");
    return TCL_ERROR;
  }

  Graph* graphPtr = new LineGraph(clientData, interp, objc, objv);
  return graphPtr->valid_ ? TCL_OK : TCL_ERROR;
}

static int BarchartObjCmd(ClientData clientData, Tcl_Interp* interp, int objc, 
			  Tcl_Obj* const objv[])
{
  if (objc < 2) {
    Tcl_WrongNumArgs(interp, 1, objv, "pathName ?options?");
    return TCL_ERROR;
  }

  Graph* graphPtr = new BarGraph(clientData, interp, objc, objv);
  return graphPtr->valid_ ? TCL_OK : TCL_ERROR;
}

int GraphInstCmdProc(ClientData clientData, Tcl_Interp* interp, 
		     int objc, Tcl_Obj* const objv[])
{
  Graph* graphPtr = (Graph*)clientData;
  Tcl_Preserve(graphPtr);
  int result = graphPtr->invoke(graphEnsemble, 1, objc, objv);
  Tcl_Release(graphPtr);
  return result;
}

// called by Tcl_DeleteCommand
void GraphInstCmdDeleteProc(ClientData clientData)
{
  Graph* graphPtr = (Graph*)clientData;
  if (!(graphPtr->flags & GRAPH_DELETED))
    Tk_DestroyWindow(graphPtr->tkwin_);
}

void GraphEventProc(ClientData clientData, XEvent* eventPtr)
{
  Graph* graphPtr = (Graph*)clientData;

  if (eventPtr->type == Expose) {
    if (eventPtr->xexpose.count == 0)
      graphPtr->eventuallyRedraw();
  }
  else if (eventPtr->type == FocusIn || eventPtr->type == FocusOut) {
    if (eventPtr->xfocus.detail != NotifyInferior) {
      if (eventPtr->type == FocusIn)
	graphPtr->flags |= FOCUS;
      else
	graphPtr->flags &= ~FOCUS;
      graphPtr->eventuallyRedraw();
    }
  }
  else if (eventPtr->type == DestroyNotify) {
    if (!(graphPtr->flags & GRAPH_DELETED)) {
      graphPtr->flags |= GRAPH_DELETED;
      Tcl_DeleteCommandFromToken(graphPtr->interp_, graphPtr->cmdToken_);
      if (graphPtr->flags & REDRAW_PENDING)
	Tcl_CancelIdleCall(DisplayGraph, graphPtr);
      Tcl_EventuallyFree(graphPtr, DestroyGraph);
    }
  }
  else if (eventPtr->type == ConfigureNotify) {
    graphPtr->flags |= RESET;
    graphPtr->eventuallyRedraw();
  }
}

void DisplayGraph(ClientData clientData)
{
  Graph* graphPtr = (Graph*)clientData;
  graphPtr->draw();
}

// called by Tcl_EventuallyFree and others
void DestroyGraph(char* dataPtr)
{
  Graph* graphPtr = (Graph*)dataPtr;
  delete graphPtr;
}