#include <petsc/private/drawimpl.h> /*I   "petscdraw.h"  I*/

#define PETSC_DRAW_AXIS_MAX_SEGMENTS 20
PetscClassId PETSC_DRAWAXIS_CLASSID = 0;

/*@
   PetscDrawAxisCreate - Generate the axis data structure.

   Collective

   Input Parameters:
.  win - `PetscDraw` object where axis to to be made

   Output Parameter:
.  axis - the axis datastructure

   Note:
   The MPI communicator that owns the underlying draw object owns the `PetscDrawAxis` object, but calls to set `PetscDrawAxis` options are
   ignored by all processes except the first MPI rank in the communicator

   Level: advanced

.seealso: `PetscDrawLGCreate()`, `PetscDrawLG`, `PetscDrawSPCreate()`, `PetscDrawSP`, `PetscDrawHGCreate()`, `PetscDrawHG`, `PetscDrawBarCreate()`, `PetscDrawBar`, `PetscDrawLGGetAxis()`, `PetscDrawSPGetAxis()`,
          `PetscDrawHGGetAxis()`, `PetscDrawBarGetAxis()`, `PetscDrawAxis`, `PetscDrawAxisDestroy()`, `PetscDrawAxisSetColors()`, `PetscDrawAxisSetLabels()`, `PetscDrawAxisSetLimits()`, `PetscDrawAxisGetLimits()`, `PetscDrawAxisSetHoldLimits()`,
          `PetscDrawAxisDraw()`
@*/
PetscErrorCode PetscDrawAxisCreate(PetscDraw draw, PetscDrawAxis *axis)
{
  PetscDrawAxis ad;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(draw, PETSC_DRAW_CLASSID, 1);
  PetscValidPointer(axis, 2);

  PetscCall(PetscHeaderCreate(ad, PETSC_DRAWAXIS_CLASSID, "DrawAxis", "Draw Axis", "Draw", PetscObjectComm((PetscObject)draw), PetscDrawAxisDestroy, NULL));

  PetscCall(PetscObjectReference((PetscObject)draw));
  ad->win = draw;

  ad->xticks    = PetscADefTicks;
  ad->yticks    = PetscADefTicks;
  ad->xlabelstr = PetscADefLabel;
  ad->ylabelstr = PetscADefLabel;
  ad->ac        = PETSC_DRAW_BLACK;
  ad->tc        = PETSC_DRAW_BLACK;
  ad->cc        = PETSC_DRAW_BLACK;
  ad->xlabel    = NULL;
  ad->ylabel    = NULL;
  ad->toplabel  = NULL;

  *axis = ad;
  PetscFunctionReturn(0);
}

/*@
    PetscDrawAxisDestroy - Frees the space used by an axis structure.

    Collective

    Input Parameters:
.   axis - the axis context

    Level: advanced

.seealso: `PetscDraw`, `PetscDrawAxisCreate()`, `PetscDrawAxis`
@*/
PetscErrorCode PetscDrawAxisDestroy(PetscDrawAxis *axis)
{
  PetscFunctionBegin;
  if (!*axis) PetscFunctionReturn(0);
  PetscValidHeaderSpecific(*axis, PETSC_DRAWAXIS_CLASSID, 1);
  if (--((PetscObject)(*axis))->refct > 0) {
    *axis = NULL;
    PetscFunctionReturn(0);
  }

  PetscCall(PetscFree((*axis)->toplabel));
  PetscCall(PetscFree((*axis)->xlabel));
  PetscCall(PetscFree((*axis)->ylabel));
  PetscCall(PetscDrawDestroy(&(*axis)->win));
  PetscCall(PetscHeaderDestroy(axis));
  PetscFunctionReturn(0);
}

/*@
    PetscDrawAxisSetColors -  Sets the colors to be used for the axis,
                         tickmarks, and text.

    Logically Collective

    Input Parameters:
+   axis - the axis
.   ac - the color of the axis lines
.   tc - the color of the tick marks
-   cc - the color of the text strings

    Level: advanced

.seealso: `PetscDraw`, `PetscDrawAxisCreate()`, `PetscDrawAxis`, `PetscDrawAxisSetLabels()`, `PetscDrawAxisDraw()`, `PetscDrawAxisSetLimits()`
@*/
PetscErrorCode PetscDrawAxisSetColors(PetscDrawAxis axis, int ac, int tc, int cc)
{
  PetscFunctionBegin;
  PetscValidHeaderSpecific(axis, PETSC_DRAWAXIS_CLASSID, 1);
  PetscValidLogicalCollectiveInt(axis, ac, 2);
  PetscValidLogicalCollectiveInt(axis, tc, 3);
  PetscValidLogicalCollectiveInt(axis, cc, 4);
  axis->ac = ac;
  axis->tc = tc;
  axis->cc = cc;
  PetscFunctionReturn(0);
}

/*@C
    PetscDrawAxisSetLabels -  Sets the x and y axis labels.

    Logically Collective

    Input Parameters:
+   axis - the axis
.   top - the label at the top of the image
-   xlabel,ylabel - the labes for the x and y axis

    Notes:
    Must be called before `PetscDrawAxisDraw()` or `PetscDrawLGDraw()`

    There should be no newlines in the arguments

    Level: advanced

.seealso: `PetscDraw`, `PetscDrawAxisCreate()`, `PetscDrawAxis`, `PetscDrawAxisSetColors()`, `PetscDrawAxisDraw()`, `PetscDrawAxisSetLimits()`
@*/
PetscErrorCode PetscDrawAxisSetLabels(PetscDrawAxis axis, const char top[], const char xlabel[], const char ylabel[])
{
  PetscFunctionBegin;
  PetscValidHeaderSpecific(axis, PETSC_DRAWAXIS_CLASSID, 1);
  PetscCall(PetscFree(axis->xlabel));
  PetscCall(PetscFree(axis->ylabel));
  PetscCall(PetscFree(axis->toplabel));
  PetscCall(PetscStrallocpy(xlabel, &axis->xlabel));
  PetscCall(PetscStrallocpy(ylabel, &axis->ylabel));
  PetscCall(PetscStrallocpy(top, &axis->toplabel));
  PetscFunctionReturn(0);
}

/*@
    PetscDrawAxisSetLimits -  Sets the limits (in user coords) of the axis

    Logically Collective

    Input Parameters:
+   axis - the axis
.   xmin,xmax - limits in x
-   ymin,ymax - limits in y

    Options Database Key:
.   -drawaxis_hold - hold the initial set of axis limits for future plotting

    Level: advanced

.seealso: `PetscDrawAxisSetHoldLimits()`, `PetscDrawAxisGetLimits()`, `PetscDrawAxisSetLabels()`, `PetscDrawAxisSetColors()`
@*/
PetscErrorCode PetscDrawAxisSetLimits(PetscDrawAxis axis, PetscReal xmin, PetscReal xmax, PetscReal ymin, PetscReal ymax)
{
  PetscFunctionBegin;
  PetscValidHeaderSpecific(axis, PETSC_DRAWAXIS_CLASSID, 1);
  if (axis->hold) PetscFunctionReturn(0);
  axis->xlow  = xmin;
  axis->xhigh = xmax;
  axis->ylow  = ymin;
  axis->yhigh = ymax;
  PetscCall(PetscOptionsHasName(((PetscObject)axis)->options, ((PetscObject)axis)->prefix, "-drawaxis_hold", &axis->hold));
  PetscFunctionReturn(0);
}

/*@
    PetscDrawAxisGetLimits -  Gets the limits (in user coords) of the axis

    Not Collective

    Input Parameters:
+   axis - the axis
.   xmin,xmax - limits in x
-   ymin,ymax - limits in y

    Level: advanced

.seealso: `PetscDrawAxisCreate()`, `PetscDrawAxis`, `PetscDrawAxisSetHoldLimits()`, `PetscDrawAxisSetLimits()`, `PetscDrawAxisSetLabels()`, `PetscDrawAxisSetColors()`
@*/
PetscErrorCode PetscDrawAxisGetLimits(PetscDrawAxis axis, PetscReal *xmin, PetscReal *xmax, PetscReal *ymin, PetscReal *ymax)
{
  PetscFunctionBegin;
  PetscValidHeaderSpecific(axis, PETSC_DRAWAXIS_CLASSID, 1);
  if (xmin) *xmin = axis->xlow;
  if (xmax) *xmax = axis->xhigh;
  if (ymin) *ymin = axis->ylow;
  if (ymax) *ymax = axis->yhigh;
  PetscFunctionReturn(0);
}

/*@
    PetscDrawAxisSetHoldLimits -  Causes an axis to keep the same limits until this is called
        again

    Logically Collective

    Input Parameters:
+   axis - the axis
-   hold - `PETSC_TRUE` - hold current limits, `PETSC_FALSE` allow limits to be changed

    Level: advanced

    Note:
        Once this has been called with `PETSC_TRUE` the limits will not change if you call
     `PetscDrawAxisSetLimits()` until you call this with `PETSC_FALSE`

.seealso: `PetscDrawAxisCreate()`, `PetscDrawAxis`, `PetscDrawAxisGetLimits()`, `PetscDrawAxisSetLimits()`, `PetscDrawAxisSetLabels()`, `PetscDrawAxisSetColors()`
@*/
PetscErrorCode PetscDrawAxisSetHoldLimits(PetscDrawAxis axis, PetscBool hold)
{
  PetscFunctionBegin;
  PetscValidHeaderSpecific(axis, PETSC_DRAWAXIS_CLASSID, 1);
  PetscValidLogicalCollectiveBool(axis, hold, 2);
  axis->hold = hold;
  PetscFunctionReturn(0);
}

/*@
    PetscDrawAxisDraw - draws an axis.

    Collective

    Input Parameter:
.   axis - `PetscDrawAxis` structure

    Level: advanced

    Note:
    This draws the actual axis.  The limits etc have already been set.
    By picking special routines for the ticks and labels, special
    effects may be generated.  These routines are part of the Axis
    structure (axis).

.seealso: `PetscDrawAxisCreate()`, `PetscDrawAxis`, `PetscDrawAxisGetLimits()`, `PetscDrawAxisSetLimits()`, `PetscDrawAxisSetLabels()`, `PetscDrawAxisSetColors()`
@*/
PetscErrorCode PetscDrawAxisDraw(PetscDrawAxis axis)
{
  int         i, ntick, numx, numy, ac, tc, cc;
  PetscMPIInt rank;
  size_t      len, ytlen = 0;
  PetscReal   coors[4], tickloc[PETSC_DRAW_AXIS_MAX_SEGMENTS], sep, tw, th;
  PetscReal   xl, xr, yl, yr, dxl = 0, dyl = 0, dxr = 0, dyr = 0;
  char       *p;
  PetscDraw   draw;
  PetscBool   isnull;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(axis, PETSC_DRAWAXIS_CLASSID, 1);
  PetscCall(PetscDrawIsNull(axis->win, &isnull));
  if (isnull) PetscFunctionReturn(0);
  PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)axis), &rank));

  draw = axis->win;

  ac = axis->ac;
  tc = axis->tc;
  cc = axis->cc;
  if (axis->xlow == axis->xhigh) {
    axis->xlow -= .5;
    axis->xhigh += .5;
  }
  if (axis->ylow == axis->yhigh) {
    axis->ylow -= .5;
    axis->yhigh += .5;
  }

  PetscDrawCollectiveBegin(draw);
  if (rank) goto finally;

  /* get cannonical string size */
  PetscCall(PetscDrawSetCoordinates(draw, 0, 0, 1, 1));
  PetscCall(PetscDrawStringGetSize(draw, &tw, &th));
  /* lower spacing */
  if (axis->xlabelstr) dyl += 1.5 * th;
  if (axis->xlabel) dyl += 1.5 * th;
  /* left spacing */
  if (axis->ylabelstr) dxl += 7.5 * tw;
  if (axis->ylabel) dxl += 2.0 * tw;
  /* right and top spacing */
  if (axis->xlabelstr) dxr = 2.5 * tw;
  if (axis->ylabelstr) dyr = 0.5 * th;
  if (axis->toplabel) dyr = 1.5 * th;
  /* extra spacing */
  dxl += 0.7 * tw;
  dxr += 0.5 * tw;
  dyl += 0.2 * th;
  dyr += 0.2 * th;
  /* determine coordinates */
  xl = (dxl * axis->xhigh + dxr * axis->xlow - axis->xlow) / (dxl + dxr - 1);
  xr = (dxl * axis->xhigh + dxr * axis->xlow - axis->xhigh) / (dxl + dxr - 1);
  yl = (dyl * axis->yhigh + dyr * axis->ylow - axis->ylow) / (dyl + dyr - 1);
  yr = (dyl * axis->yhigh + dyr * axis->ylow - axis->yhigh) / (dyl + dyr - 1);
  PetscCall(PetscDrawSetCoordinates(draw, xl, yl, xr, yr));
  PetscCall(PetscDrawStringGetSize(draw, &tw, &th));

  /* PetscDraw the axis lines */
  PetscCall(PetscDrawLine(draw, axis->xlow, axis->ylow, axis->xhigh, axis->ylow, ac));
  PetscCall(PetscDrawLine(draw, axis->xlow, axis->ylow, axis->xlow, axis->yhigh, ac));
  PetscCall(PetscDrawLine(draw, axis->xlow, axis->yhigh, axis->xhigh, axis->yhigh, ac));
  PetscCall(PetscDrawLine(draw, axis->xhigh, axis->ylow, axis->xhigh, axis->yhigh, ac));

  /* PetscDraw the top label */
  if (axis->toplabel) {
    PetscReal x = (axis->xlow + axis->xhigh) / 2, y = axis->yhigh + 0.5 * th;
    PetscCall(PetscDrawStringCentered(draw, x, y, cc, axis->toplabel));
  }

  /* PetscDraw the X ticks and labels */
  if (axis->xticks) {
    numx = (int)(.15 * (axis->xhigh - axis->xlow) / tw);
    numx = PetscClipInterval(numx, 2, 6);
    PetscCall((*axis->xticks)(axis->xlow, axis->xhigh, numx, &ntick, tickloc, PETSC_DRAW_AXIS_MAX_SEGMENTS));
    /* PetscDraw in tick marks */
    for (i = 0; i < ntick; i++) {
      PetscCall(PetscDrawLine(draw, tickloc[i], axis->ylow, tickloc[i], axis->ylow + .5 * th, tc));
      PetscCall(PetscDrawLine(draw, tickloc[i], axis->yhigh, tickloc[i], axis->yhigh - .5 * th, tc));
    }
    /* label ticks */
    if (axis->xlabelstr) {
      for (i = 0; i < ntick; i++) {
        if (i < ntick - 1) sep = tickloc[i + 1] - tickloc[i];
        else if (i > 0) sep = tickloc[i] - tickloc[i - 1];
        else sep = 0.0;
        PetscCall((*axis->xlabelstr)(tickloc[i], sep, &p));
        PetscCall(PetscDrawStringCentered(draw, tickloc[i], axis->ylow - 1.5 * th, cc, p));
      }
    }
  }
  if (axis->xlabel) {
    PetscReal x = (axis->xlow + axis->xhigh) / 2, y = axis->ylow - 1.5 * th;
    if (axis->xlabelstr) y -= 1.5 * th;
    PetscCall(PetscDrawStringCentered(draw, x, y, cc, axis->xlabel));
  }

  /* PetscDraw the Y ticks and labels */
  if (axis->yticks) {
    numy = (int)(.50 * (axis->yhigh - axis->ylow) / th);
    numy = PetscClipInterval(numy, 2, 6);
    PetscCall((*axis->yticks)(axis->ylow, axis->yhigh, numy, &ntick, tickloc, PETSC_DRAW_AXIS_MAX_SEGMENTS));
    /* PetscDraw in tick marks */
    for (i = 0; i < ntick; i++) {
      PetscCall(PetscDrawLine(draw, axis->xlow, tickloc[i], axis->xlow + .5 * tw, tickloc[i], tc));
      PetscCall(PetscDrawLine(draw, axis->xhigh, tickloc[i], axis->xhigh - .5 * tw, tickloc[i], tc));
    }
    /* label ticks */
    if (axis->ylabelstr) {
      for (i = 0; i < ntick; i++) {
        if (i < ntick - 1) sep = tickloc[i + 1] - tickloc[i];
        else if (i > 0) sep = tickloc[i] - tickloc[i - 1];
        else sep = 0.0;
        PetscCall((*axis->ylabelstr)(tickloc[i], sep, &p));
        PetscCall(PetscStrlen(p, &len));
        ytlen = PetscMax(ytlen, len);
        PetscCall(PetscDrawString(draw, axis->xlow - (len + .5) * tw, tickloc[i] - .5 * th, cc, p));
      }
    }
  }
  if (axis->ylabel) {
    PetscReal x = axis->xlow - 2.0 * tw, y = (axis->ylow + axis->yhigh) / 2;
    if (axis->ylabelstr) x -= (ytlen + .5) * tw;
    PetscCall(PetscStrlen(axis->ylabel, &len));
    PetscCall(PetscDrawStringVertical(draw, x, y + len * th / 2, cc, axis->ylabel));
  }

  PetscCall(PetscDrawGetCoordinates(draw, &coors[0], &coors[1], &coors[2], &coors[3]));
finally:
  PetscDrawCollectiveEnd(draw);
  PetscCallMPI(MPI_Bcast(coors, 4, MPIU_REAL, 0, PetscObjectComm((PetscObject)draw)));
  PetscCall(PetscDrawSetCoordinates(draw, coors[0], coors[1], coors[2], coors[3]));
  PetscFunctionReturn(0);
}

/*
    Removes all zeros but one from .0000
*/
PetscErrorCode PetscStripe0(char *buf)
{
  size_t    n;
  PetscBool flg;
  char     *str;

  PetscFunctionBegin;
  PetscCall(PetscStrlen(buf, &n));
  PetscCall(PetscStrendswith(buf, "e00", &flg));
  if (flg) buf[n - 3] = 0;
  PetscCall(PetscStrstr(buf, "e0", &str));
  if (str) {
    buf[n - 2] = buf[n - 1];
    buf[n - 1] = 0;
  }
  PetscCall(PetscStrstr(buf, "e-0", &str));
  if (str) {
    buf[n - 2] = buf[n - 1];
    buf[n - 1] = 0;
  }
  PetscFunctionReturn(0);
}

/*
    Removes all zeros but one from .0000
*/
PetscErrorCode PetscStripAllZeros(char *buf)
{
  size_t i, n;

  PetscFunctionBegin;
  PetscCall(PetscStrlen(buf, &n));
  if (buf[0] != '.') PetscFunctionReturn(0);
  for (i = 1; i < n; i++) {
    if (buf[i] != '0') PetscFunctionReturn(0);
  }
  buf[0] = '0';
  buf[1] = 0;
  PetscFunctionReturn(0);
}

/*
    Removes trailing zeros
*/
PetscErrorCode PetscStripTrailingZeros(char *buf)
{
  char  *found;
  size_t i, n, m = PETSC_MAX_INT;

  PetscFunctionBegin;
  /* if there is an e in string DO NOT strip trailing zeros */
  PetscCall(PetscStrchr(buf, 'e', &found));
  if (found) PetscFunctionReturn(0);

  PetscCall(PetscStrlen(buf, &n));
  /* locate decimal point */
  for (i = 0; i < n; i++) {
    if (buf[i] == '.') {
      m = i;
      break;
    }
  }
  /* if not decimal point then no zeros to remove */
  if (m == PETSC_MAX_INT) PetscFunctionReturn(0);
  /* start at right end of string removing 0s */
  for (i = n - 1; i > m; i++) {
    if (buf[i] != '0') PetscFunctionReturn(0);
    buf[i] = 0;
  }
  PetscFunctionReturn(0);
}

/*
    Removes leading 0 from 0.22 or -0.22
*/
PetscErrorCode PetscStripInitialZero(char *buf)
{
  size_t i, n;

  PetscFunctionBegin;
  PetscCall(PetscStrlen(buf, &n));
  if (buf[0] == '0') {
    for (i = 0; i < n; i++) buf[i] = buf[i + 1];
  } else if (buf[0] == '-' && buf[1] == '0') {
    for (i = 1; i < n; i++) buf[i] = buf[i + 1];
  }
  PetscFunctionReturn(0);
}

/*
     Removes the extraneous zeros in numbers like 1.10000e6
*/
PetscErrorCode PetscStripZeros(char *buf)
{
  size_t i, j, n;

  PetscFunctionBegin;
  PetscCall(PetscStrlen(buf, &n));
  if (n < 5) PetscFunctionReturn(0);
  for (i = 1; i < n - 1; i++) {
    if (buf[i] == 'e' && buf[i - 1] == '0') {
      for (j = i; j < n + 1; j++) buf[j - 1] = buf[j];
      PetscCall(PetscStripZeros(buf));
      PetscFunctionReturn(0);
    }
  }
  PetscFunctionReturn(0);
}

/*
      Removes the plus in something like 1.1e+2 or 1.1e+02
*/
PetscErrorCode PetscStripZerosPlus(char *buf)
{
  size_t i, j, n;

  PetscFunctionBegin;
  PetscCall(PetscStrlen(buf, &n));
  if (n < 5) PetscFunctionReturn(0);
  for (i = 1; i < n - 2; i++) {
    if (buf[i] == '+') {
      if (buf[i + 1] == '0') {
        for (j = i + 1; j < n; j++) buf[j - 1] = buf[j + 1];
        PetscFunctionReturn(0);
      } else {
        for (j = i + 1; j < n + 1; j++) buf[j - 1] = buf[j];
        PetscFunctionReturn(0);
      }
    } else if (buf[i] == '-') {
      if (buf[i + 1] == '0') {
        for (j = i + 1; j < n; j++) buf[j] = buf[j + 1];
        PetscFunctionReturn(0);
      }
    }
  }
  PetscFunctionReturn(0);
}