/* 
A* -------------------------------------------------------------------
B* This file contains source code for the PyMOL computer program
C* copyright 1998-2000 by Warren Lyford Delano of DeLano Scientific. 
D* -------------------------------------------------------------------
E* It is unlawful to modify or remove this copyright notice.
F* -------------------------------------------------------------------
G* Please see the accompanying LICENSE file for further information. 
H* -------------------------------------------------------------------
I* Additional authors of this source file include:
-* 
-* 
-*
Z* -------------------------------------------------------------------
*/
#include"os_python.h"

#include"os_predef.h"
#include"os_std.h"
#include"os_gl.h"

#include"Err.h"
#include"RepDihedral.h"
#include"Color.h"
#include"Scene.h"
#include"main.h"
#include"Vector.h"
#include"Setting.h"
#include"PyMOLObject.h"
#include"ShaderMgr.h"
#include"CGO.h"
#include"CoordSet.h"

struct RepDihedral : Rep {
  using Rep::Rep;

  ~RepDihedral() override;

  cRep_t type() const override { return cRepDihedral; }
  void render(RenderInfo* info) override;

  float* V = nullptr;
  int N = 0;
  DistSet *ds;
  float linewidth, radius;
  CGO* shaderCGO = nullptr;
};

#include"ObjectDist.h"

RepDihedral::~RepDihedral()
{
  auto I = this;
  if (I->shaderCGO){
    CGOFree(I->shaderCGO);
    I->shaderCGO = 0;
  }
  VLAFreeP(I->V);
}

static int RepDihedralCGOGenerate(RepDihedral * I, RenderInfo * info)
{
  PyMOLGlobals *G = I->G;
  float *v = I->V;
  int c = I->N;
  float line_width;
  int ok = true;
  CGO *convertcgo = nullptr;
  short dash_as_cylinders = 0;
  int color =
    SettingGet_color(G, nullptr, I->ds->Obj->Setting.get(), cSetting_dihedral_color);
  I->linewidth = line_width =
    SettingGet_f(G, nullptr, I->ds->Obj->Setting.get(), cSetting_dash_width);
  I->radius =
    SettingGet_f(G, nullptr, I->ds->Obj->Setting.get(), cSetting_dash_radius);

  line_width = SceneGetDynamicLineWidth(info, line_width);

  dash_as_cylinders = SettingGetGlobal_b(G, cSetting_render_as_cylinders) && SettingGetGlobal_b(G, cSetting_dash_as_cylinders);

  if (ok)
    ok &= CGOSpecial(I->shaderCGO, LINEWIDTH_DYNAMIC_WITH_SCALE_DASH);
  if (ok)
    ok &= CGOResetNormal(I->shaderCGO, true);


  if (ok){
    if (color < 0) {
      color = I->getObj()->Color;
    }
    if(color >= 0){
      ok &= CGOColorv(I->shaderCGO, ColorGet(G, color));
    }
  }
  v = I->V;
  c = I->N;
  if (dash_as_cylinders){
    float *origin = nullptr, axis[3];
    while(ok && c > 0) {
      origin = v;
      v += 3;
      axis[0] = v[0] - origin[0];
      axis[1] = v[1] - origin[1];
      axis[2] = v[2] - origin[2];
      v += 3;
      ok &= (bool)I->shaderCGO->add<cgo::draw::shadercylinder>(origin, axis, 1.f, 15);
      c -= 2;
    }
  } else {
    if (ok)
      ok &= CGOBegin(I->shaderCGO, GL_LINES);
    while(ok && c > 0) {
      ok &= CGOVertexv(I->shaderCGO, v);
      v += 3;
      if (ok)
	ok &= CGOVertexv(I->shaderCGO, v);
      v += 3;
      c -= 2;
    }
    if (ok)
      ok &= CGOEnd(I->shaderCGO);
  }

  if (ok)
    ok &= CGOStop(I->shaderCGO);
  if (ok)
    convertcgo = CGOCombineBeginEnd(I->shaderCGO, 0);    
  CHECKOK(ok, convertcgo);
  CGOFree(I->shaderCGO);    
  I->shaderCGO = convertcgo;
  convertcgo = nullptr;
  if (ok){
    if (dash_as_cylinders){
      CGO *tmpCGO = CGONew(G);
      if (ok) ok &= CGOEnable(tmpCGO, GL_CYLINDER_SHADER);
      if (ok) ok &= CGOSpecial(tmpCGO, CYLINDER_WIDTH_FOR_DISTANCES);
      convertcgo = CGOConvertShaderCylindersToCylinderShader(I->shaderCGO, tmpCGO);
      if (ok) ok &= CGOEnable(tmpCGO, GL_DASH_TRANSPARENCY_DEPTH_TEST);
      if (ok) ok &= CGOAppendNoStop(tmpCGO, convertcgo);
      if (ok) ok &= CGODisable(tmpCGO, GL_DASH_TRANSPARENCY_DEPTH_TEST);
      if (ok) ok &= CGODisable(tmpCGO, GL_CYLINDER_SHADER);
      if (ok) ok &= CGOStop(tmpCGO);
      CGOFreeWithoutVBOs(convertcgo);
      convertcgo = tmpCGO;
    } else {
      CGO *tmpCGO = CGONew(G);
      if (ok) ok &= CGOEnable(tmpCGO, GL_DEFAULT_SHADER);
      if (ok) ok &= CGODisable(tmpCGO, CGO_GL_LIGHTING);
      convertcgo = CGOOptimizeToVBONotIndexedNoShader(I->shaderCGO);
      if (ok) ok &= CGOEnable(tmpCGO, GL_DASH_TRANSPARENCY_DEPTH_TEST);
      if (ok) ok &= CGOAppendNoStop(tmpCGO, convertcgo);
      if (ok) ok &= CGODisable(tmpCGO, GL_DASH_TRANSPARENCY_DEPTH_TEST);
      if (ok) ok &= CGODisable(tmpCGO, GL_DEFAULT_SHADER);
      if (ok) ok &= CGOStop(tmpCGO);
      CGOFreeWithoutVBOs(convertcgo);
      convertcgo = tmpCGO;
    }
    convertcgo->use_shader = true;
  }
  if (convertcgo){
    CGOFree(I->shaderCGO);
    I->shaderCGO = convertcgo;
  }
  return ok;
}

void RepDihedral::render(RenderInfo * info)
{
  auto I = this;
  CRay *ray = info->ray;
  auto pick = info->pick;
  float *v = I->V;
  int c = I->N;
  const float *vc;
  float line_width;
  int round_ends;
  int ok = true;
  int color =
    SettingGet_color(G, nullptr, I->ds->Obj->Setting.get(), cSetting_dihedral_color);
  float dash_transparency =
    SettingGet_f(G, nullptr, I->ds->Obj->Setting.get(), cSetting_dash_transparency);
  bool t_mode_3 =
    SettingGet_i(G, nullptr, I->ds->Obj->Setting.get(), cSetting_transparency_mode) == 3;
  short dash_transparency_enabled;
  if(color < 0)
    color = getObj()->Color;
  dash_transparency = (dash_transparency < 0.f ? 0.f : (dash_transparency > 1.f ? 1.f : dash_transparency));
  dash_transparency_enabled = (dash_transparency > 0.f);

  if (!(ray || pick) && (info->pass == RenderPass::Antialias || (info->pass == RenderPass::Opaque) == dash_transparency_enabled))
    return;

  I->linewidth = line_width =
    SettingGet_f(G, nullptr, I->ds->Obj->Setting.get(), cSetting_dash_width);
  I->radius =
    SettingGet_f(G, nullptr, I->ds->Obj->Setting.get(), cSetting_dash_radius);
  round_ends =
    SettingGet_b(G, nullptr, I->ds->Obj->Setting.get(), cSetting_dash_round_ends);

  line_width = SceneGetDynamicLineWidth(info, line_width);

  if(ray) {
#ifndef _PYMOL_NO_RAY
    float radius;

    if (dash_transparency_enabled){
      ray->transparentf(dash_transparency);      
    }

    if(I->radius == 0.0F) {
      radius = ray->PixelRadius * line_width / 2.0F;
    } else {
      radius = I->radius;
    }

    vc = ColorGet(G, color);
    v = I->V;
    c = I->N;

    while(ok && c > 0) {
      /*      printf("%8.3f %8.3f %8.3f   %8.3f %8.3f %8.3f \n",v[3],v[4],v[5],v[6],v[7],v[8]); */
      if(round_ends) {
        ok &= ray->sausage3fv(v, v + 3, radius, vc, vc);
      } else {
        ok &= ray->customCylinder3fv(v, v + 3, radius, vc, vc, cCylCapFlat, cCylCapFlat);
      }
      v += 6;
      c -= 2;
    }
#endif
  } else if(G->HaveGUI && G->ValidContext) {
    if(pick) {
    } else {
      short use_shader, generate_shader_cgo = 0;

      use_shader = SettingGetGlobal_b(G, cSetting_dash_use_shader) & 
                   SettingGetGlobal_b(G, cSetting_use_shaders);

      if (!use_shader && I->shaderCGO){
	CGOFree(I->shaderCGO);
	I->shaderCGO = 0;
      }
      if (use_shader){
	if (!I->shaderCGO){
	  I->shaderCGO = CGONew(G);
	  CHECKOK(ok, I->shaderCGO);
	  if (ok)
	    I->shaderCGO->use_shader = true;
	  generate_shader_cgo = 1;
	  if (dash_transparency_enabled){
	    CGOAlpha(I->shaderCGO, 1.f-dash_transparency);
	  }
	  ok &= RepDihedralCGOGenerate(I, info);
	} else {
	  CGORender(I->shaderCGO, nullptr, nullptr, nullptr, info, I);
	  return;
	}
      }
#ifndef PURE_OPENGL_ES_2
      if (!generate_shader_cgo) {
	if(info->width_scale_flag) {
	  glLineWidth(line_width * info->width_scale);
	} else {
	  glLineWidth(line_width);
	}
        SceneResetNormal(G, true);

	if(color >= 0){
	  if (dash_transparency_enabled){
	    const float *col = ColorGet(G, color);
	    glColor4f(col[0], col[1], col[2], 1.f-dash_transparency);
	  } else {
	    glColor3fv(ColorGet(G, color));
	  }
	}
        v = I->V;
        c = I->N;

	if (dash_transparency_enabled && !t_mode_3)
 	  glDisable(GL_DEPTH_TEST);	
        if(!info->line_lighting)
          glDisable(GL_LIGHTING);

        glBegin(GL_LINES);
        while(c > 0) {
          glVertex3fv(v);
          v += 3;
          glVertex3fv(v);
          v += 3;
          c -= 2;
        }
        glEnd();
        glEnable(GL_LIGHTING);
        if (dash_transparency_enabled && !t_mode_3)
          glEnable(GL_DEPTH_TEST);	
      }
#endif
      if (use_shader) {
	
	if (ok) {
	  CGORender(I->shaderCGO, nullptr, nullptr, nullptr, info, I);
	}
      }
    }
  }
  if (!ok){
    CGOFree(I->shaderCGO);
    I->ds->Rep[cRepDihedral] = nullptr;
    delete I;
  }
}

Rep *RepDihedralNew(DistSet * ds, int state)
{
  PyMOLGlobals *G = ds->G;
  int a;
  int n;
  float *v;
  float dash_len, dash_gap, dash_sum;
  int ok = true;

  if(!ok || !ds->NDihedralIndex) {
    return (nullptr);
  }

  auto I = new RepDihedral(ds->Obj, state);

  if (ds && ds->getNRep() > cRepDihedral && ds->Rep[cRepDihedral])
    I->cs = ds->Rep[cRepDihedral]->cs;

  dash_len = SettingGet_f(G, nullptr, ds->Obj->Setting.get(), cSetting_dash_length);
  dash_gap = SettingGet_f(G, nullptr, ds->Obj->Setting.get(), cSetting_dash_gap);
  dash_sum = dash_len + dash_gap;
  if(dash_sum < R_SMALL4)
    dash_sum = 0.5;

  I->ds = ds;

  n = 0;
  if(ds->NDihedralIndex) {

    float *v1, *v2, *v3, *v4, *v5;

    float d12[3], d32[3], d43[3], n12[3], n32[3], n43[3];
    float p12[3], p43[3], np12[3], np43[3], v12[3], v43[3];
    float s12[3], s43[3];

    float a32[3];
    float l1, l2;
    float d3[3], n1[3], n3[3], x[3], y[3];
    float radius, length, angle, phase, pos;
    float dihedral_size =
      SettingGet_f(G, nullptr, ds->Obj->Setting.get(), cSetting_dihedral_size);

    I->V = VLAlloc(float, ds->NDihedralIndex * 10);
    CHECKOK(ok, I->V);
    for(a = 0; ok && a < ds->NDihedralIndex; a = a + 6) {
      v1 = ds->DihedralCoord + 3 * a;
      v2 = v1 + 3;
      v3 = v1 + 6;
      v4 = v1 + 9;
      v5 = v1 + 12;

      subtract3f(v1, v2, d12);
      subtract3f(v3, v2, d32);
      subtract3f(v4, v3, d43);

      normalize23f(d12, n12);
      normalize23f(d32, n32);
      normalize23f(d43, n43);

      remove_component3f(d12, n32, p12);
      remove_component3f(d43, n32, p43);

      average3f(v2, v3, a32);

      l1 = (float) length3f(p12);
      l2 = (float) length3f(p43);

      if(l1 > l2)
        radius = l2;
      else
        radius = l1;
      radius *= dihedral_size;

      normalize23f(p12, np12);
      normalize23f(p43, np43);

      scale3f(np12, radius, v12);
      scale3f(np43, radius, v43);

      extrapolate3f(v12, n12, s12);
      add3f(s12, v2, s12);
      extrapolate3f(v43, n43, s43);
      add3f(s43, v3, s43);

      add3f(a32, v12, v12);
      add3f(a32, v43, v43);

      angle = get_angle3f(p12, p43);

      normalize23f(p12, n1);

      remove_component3f(p43, n1, d3);

      if(length3f(d3) < R_SMALL8) {
        d3[0] = 1.0F;
        d3[1] = 0.0F;
        d3[2] = 0.0F;
      } else {
        normalize23f(d3, n3);
      }

      scale3f(n1, radius, x);
      scale3f(n3, radius, y);

      VLACheck(I->V, float, (n * 3) + 5);
      CHECKOK(ok, I->V);
      if (ok){
	v = I->V + n * 3;
	copy3f(v12, v);
	v += 3;
	copy3f(a32, v);
	n += 2;
      }
      if (ok)
	VLACheck(I->V, float, (n * 3) + 5);
      CHECKOK(ok, I->V);
      if (ok){
	v = I->V + n * 3;
	copy3f(v43, v);
	v += 3;
	copy3f(a32, v);
	n += 2;
      }

      if(ok && v5[0] != 0.0F) {       /* line 1 flag */

        VLACheck(I->V, float, (n * 3) + 5);
	CHECKOK(ok, I->V);
	if (ok){
	  v = I->V + n * 3;
	  copy3f(v1, v);
	  v += 3;
	  copy3f(v2, v);
	  n += 2;
	}
      }

      if(ok && v5[1] != 0.0F) {       /* line 2 flag */
        VLACheck(I->V, float, (n * 3) + 5);
	CHECKOK(ok, I->V);
	if (ok){
	  v = I->V + n * 3;
	  copy3f(v3, v);
	  v += 3;
	  copy3f(v2, v);
	  n += 2;
	}
      }

      if(ok && v5[2] != 0.0F) {       /* line 3 flag */
        VLACheck(I->V, float, (n * 3) + 5);
	CHECKOK(ok, I->V);
	if (ok){
	  v = I->V + n * 3;
	  copy3f(v3, v);
	  v += 3;
	  copy3f(v4, v);
	  n += 2;
	}
      }

      /* now we have a relevant orthogonal axes */

      length = (float) (angle * radius * 2);

      /* figure out dash/gap phasing that will lead to nicely space dashes and gaps */

      phase = dash_sum - (float) fmod(length / 2 + (dash_gap / 2), dash_sum);
      pos = -phase;

      if(length > R_SMALL4) {

        float vx[3], vy[3];
        float cur_angle;
        float cons_pos1, cons_pos2;

        while(ok && pos < length) {

          VLACheck(I->V, float, (n * 3) + 5);
	  CHECKOK(ok, I->V);
	  if (ok){
	    cons_pos1 = pos;
	    if(cons_pos1 < 0.0F)
	      cons_pos1 = 0.0F;
	    cons_pos2 = pos + dash_len;
	    if(cons_pos2 > length)
	      cons_pos2 = length;
	  }
          if(ok && cons_pos1 < cons_pos2) {
            cur_angle = angle * cons_pos1 / length;

            v = I->V + n * 3;
            scale3f(x, (float) cos(cur_angle), vx);
            scale3f(y, (float) sin(cur_angle), vy);
            add3f(vx, vy, v);
            add3f(a32, v, v);

            cur_angle = angle * cons_pos2 / length;

            v += 3;
            scale3f(x, (float) cos(cur_angle), vx);
            scale3f(y, (float) sin(cur_angle), vy);
            add3f(vx, vy, v);
            add3f(a32, v, v);

            n += 2;
          }
          pos += dash_sum;
        }
      }
    }
    if (ok)
      VLASize(I->V, float, n * 3);
    CHECKOK(ok, I->V);
    I->N = n;
  }
  if (!ok){
    delete I;
    I = nullptr;
  }
  return (Rep *) I;
}