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//-----------------------------------------------------------------------------

// The user-visible undo/redo operation; whenever they change something, we

// record our state and push it on a stack, and we pop the stack when they

// select undo.

//

// Copyright 2008-2013 Jonathan Westhues.

//-----------------------------------------------------------------------------

#include "solvespace.h"

namespace SolveSpace {

void SolveSpaceUI::UndoRemember() {

unsaved = true;

PushFromCurrentOnto(&undo);

UndoClearStack(&redo);

UndoEnableMenus();

}

void SolveSpaceUI::UndoUndo() {

if(undo.cnt <= 0) return;

PushFromCurrentOnto(&redo);

PopOntoCurrentFrom(&undo);

UndoEnableMenus();

}

void SolveSpaceUI::UndoRedo() {

if(redo.cnt <= 0) return;

PushFromCurrentOnto(&undo);

PopOntoCurrentFrom(&redo);

UndoEnableMenus();

}

void SolveSpaceUI::UndoEnableMenus() {

SS.GW.undoMenuItem->SetEnabled(undo.cnt > 0);

SS.GW.redoMenuItem->SetEnabled(redo.cnt > 0);

}

void SolveSpaceUI::PushFromCurrentOnto(UndoStack *uk) {

if(uk->cnt == MAX_UNDO) {

UndoClearState(&(uk->d[uk->write]));

// And then write in to this one again

} else {

(uk->cnt)++;

}

UndoState *ut = &(uk->d[uk->write]);

*ut = {};

ut->group.ReserveMore(SK.group.n);

for(Group &src : SK.group) {

// Shallow copy

Group dest(src);

// And then clean up all the stuff that needs to be a deep copy,

// and zero out all the dynamic stuff that will get regenerated.

dest.clean = false;

dest.solved = {};

dest.polyLoops = {};

dest.bezierLoops = {};

dest.bezierOpens = {};

dest.polyError = {};

dest.thisMesh = {};

dest.runningMesh = {};

dest.thisShell = {};

dest.runningShell = {};

dest.displayMesh = {};

dest.displayOutlines = {};

dest.remap = src.remap;

dest.impMesh = {};

dest.impShell = {};

dest.impEntity = {};

ut->group.Add(&dest);

}

for(auto &src : SK.groupOrder) { ut->groupOrder.Add(&src); }

ut->request.ReserveMore(SK.request.n);

for(auto &src : SK.request) { ut->request.Add(&src); }

ut->constraint.ReserveMore(SK.constraint.n);

for(auto &src : SK.constraint) {

// Shallow copy

Constraint dest(src);

ut->constraint.Add(&dest);

}

ut->param.ReserveMore(SK.param.n);

for(auto &src : SK.param) { ut->param.Add(&src); }

ut->style.ReserveMore(SK.style.n);

for(auto &src : SK.style) { ut->style.Add(&src); }

ut->activeGroup = SS.GW.activeGroup;

uk->write = WRAP(uk->write + 1, MAX_UNDO);

}

void SolveSpaceUI::PopOntoCurrentFrom(UndoStack *uk) {

ssassert(uk->cnt > 0, "Cannot pop from empty undo stack");

(uk->cnt)--;

uk->write = WRAP(uk->write - 1, MAX_UNDO);

UndoState *ut = &(uk->d[uk->write]);

// Free everything in the main copy of the program before replacing it

for(hGroup hg : SK.groupOrder) {

Group *g = SK.GetGroup(hg);

g->Clear();

}

SK.group.Clear();

SK.groupOrder.Clear();

SK.request.Clear();

SK.constraint.Clear();

SK.param.Clear();

SK.style.Clear();

// And then do a shallow copy of the state from the undo list

ut->group.MoveSelfInto(&(SK.group));

for(auto &gh : ut->groupOrder) { SK.groupOrder.Add(&gh); }

ut->request.MoveSelfInto(&(SK.request));

ut->constraint.MoveSelfInto(&(SK.constraint));

ut->param.MoveSelfInto(&(SK.param));

ut->style.MoveSelfInto(&(SK.style));

SS.GW.activeGroup = ut->activeGroup;

// No need to free it, since a shallow copy was made above

*ut = {};

// And reset the state everywhere else in the program, since the

// sketch just changed a lot.

SS.GW.ClearSuper();

SS.TW.ClearSuper();

SS.ReloadAllLinked(SS.saveFile);

SS.GenerateAll(SolveSpaceUI::Generate::ALL);

SS.ScheduleShowTW();

// Activate the group that was active before.

Group *activeGroup = SK.GetGroup(SS.GW.activeGroup);

activeGroup->Activate();

}

void SolveSpaceUI::UndoClearStack(UndoStack *uk) {

while(uk->cnt > 0) {

uk->write = WRAP(uk->write - 1, MAX_UNDO);

(uk->cnt)--;

UndoClearState(&(uk->d[uk->write]));

}

*uk = {}; // for good measure

}

void SolveSpaceUI::UndoClearState(UndoState *ut) {

for(auto &g : ut->group) { g.remap.clear(); }

ut->group.Clear();

ut->request.Clear();

ut->constraint.Clear();

ut->param.Clear();

ut->style.Clear();

*ut = {};

}

} // namespace SolveSpace