/**
 * Furnace Tracker - multi-system chiptune tracker
 * Copyright (C) 2021-2023 tildearrow and contributors
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "gui.h"
#include "guiConst.h"
#include "debug.h"
#include "IconsFontAwesome4.h"
#include <SDL_timer.h>
#include <fmt/printf.h>
#include <imgui.h>

void FurnaceGUI::drawDebug() {
  static int bpOrder;
  static int bpRow;
  static int bpTick;
  static bool bpOn;

  static double ptcClock;
  static double ptcDivider;
  static int ptcOctave;
  static int ptcMode;
  static int ptcBlockBits;
  if (nextWindow==GUI_WINDOW_DEBUG) {
    debugOpen=true;
    ImGui::SetNextWindowFocus();
    nextWindow=GUI_WINDOW_NOTHING;
  }
  if (!debugOpen) return;
  ImGui::SetNextWindowSizeConstraints(ImVec2(100.0f*dpiScale,100.0f*dpiScale),ImVec2(canvasW,canvasH));
  if (ImGui::Begin("Debug",&debugOpen,globalWinFlags|ImGuiWindowFlags_NoDocking)) {
    ImGui::Text("NOTE: use with caution.");
    if (ImGui::TreeNode("Debug Controls")) {
      if (e->isHalted()) {
        if (ImGui::Button("Resume")) e->resume();
      } else {
        if (ImGui::Button("Pause")) e->halt();
      }
      ImGui::SameLine();
      if (ImGui::Button("Frame Advance")) e->haltWhen(DIV_HALT_TICK);
      ImGui::SameLine();
      if (ImGui::Button("Row Advance")) e->haltWhen(DIV_HALT_ROW);
      ImGui::SameLine();
      if (ImGui::Button("Pattern Advance")) e->haltWhen(DIV_HALT_PATTERN);

      if (ImGui::Button("Play Command Stream")) openFileDialog(GUI_FILE_CMDSTREAM_OPEN);

      if (ImGui::Button("Panic")) e->syncReset();
      ImGui::SameLine();
      if (ImGui::Button("Abort")) {
        abort();
      }
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Breakpoint")) {
      ImGui::InputInt("Order",&bpOrder);
      ImGui::InputInt("Row",&bpRow);
      ImGui::InputInt("Tick",&bpTick);
      ImGui::Checkbox("Enable",&bpOn);
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Chip Status")) {
      ImGui::Text("for best results set latency to minimum or use the Frame Advance button.");
      ImGui::Columns(e->song.systemLen);
      for (int i=0; i<e->song.systemLen; i++) {
        void* ch=e->getDispatch(i);
        ImGui::TextColored(uiColors[GUI_COLOR_ACCENT_PRIMARY],"Chip %d: %s",i,getSystemName(e->song.system[i]));
        if (e->song.system[i]==DIV_SYSTEM_NULL) {
          ImGui::Text("NULL");
        } else {
          putDispatchChip(ch,e->song.system[i]);
        }
        ImGui::NextColumn();
      }
      ImGui::Columns();
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Dispatch Status")) {
      ImGui::Text("for best results set latency to minimum or use the Frame Advance button.");
      ImGui::Columns(e->getTotalChannelCount());
      for (int i=0; i<e->getTotalChannelCount(); i++) {
        void* ch=e->getDispatchChanState(i);
        ImGui::TextColored(uiColors[GUI_COLOR_ACCENT_PRIMARY],"Ch. %d: %d, %d",i,e->dispatchOfChan[i],e->dispatchChanOfChan[i]);
        if (ch==NULL) {
          ImGui::Text("NULL");
        } else {
          putDispatchChan(ch,e->dispatchChanOfChan[i],e->sysOfChan[i]);
        }
        ImGui::NextColumn();
      }
      ImGui::Columns();
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Channel Status")) {
      ImGui::Text("for best results set latency to minimum or use the Frame Advance button.");
      ImGui::Columns(e->getTotalChannelCount());
      for (int i=0; i<e->getTotalChannelCount(); i++) {
        DivChannelState* ch=e->getChanState(i);
        ImGui::TextColored(uiColors[GUI_COLOR_ACCENT_PRIMARY],"Channel %d:",i);
        if (ch==NULL) {
          ImGui::Text("NULL");
        } else {
          ImGui::Text("* General:");
          ImGui::Text("- note = %d",ch->note);
          ImGui::Text("- oldNote = %d",ch->oldNote);
          ImGui::Text("- pitch = %d",ch->pitch);
          ImGui::Text("- portaSpeed = %d",ch->portaSpeed);
          ImGui::Text("- portaNote = %d",ch->portaNote);
          ImGui::Text("- volume = %.4x",ch->volume);
          ImGui::Text("- volSpeed = %d",ch->volSpeed);
          ImGui::Text("- cut = %d",ch->cut);
          ImGui::Text("- rowDelay = %d",ch->rowDelay);
          ImGui::Text("- volMax = %.4x",ch->volMax);
          ImGui::Text("- delayOrder = %d",ch->delayOrder);
          ImGui::Text("- delayRow = %d",ch->delayRow);
          ImGui::Text("- retrigSpeed = %d",ch->retrigSpeed);
          ImGui::Text("- retrigTick = %d",ch->retrigTick);
          ImGui::PushStyleColor(ImGuiCol_Text,(ch->vibratoDepth>0)?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_TEXT]);
          ImGui::Text("* Vibrato:");
          ImGui::Text("- depth = %d",ch->vibratoDepth);
          ImGui::Text("- rate = %d",ch->vibratoRate);
          ImGui::Text("- pos = %d",ch->vibratoPos);
          ImGui::Text("- dir = %d",ch->vibratoDir);
          ImGui::Text("- fine = %d",ch->vibratoFine);
          ImGui::PopStyleColor();
          ImGui::PushStyleColor(ImGuiCol_Text,(ch->tremoloDepth>0)?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_TEXT]);
          ImGui::Text("* Tremolo:");
          ImGui::Text("- depth = %d",ch->tremoloDepth);
          ImGui::Text("- rate = %d",ch->tremoloRate);
          ImGui::Text("- pos = %d",ch->tremoloPos);
          ImGui::PopStyleColor();
          ImGui::PushStyleColor(ImGuiCol_Text,(ch->arp>0)?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_TEXT]);
          ImGui::Text("* Arpeggio:");
          ImGui::Text("- arp = %.2X",ch->arp);
          ImGui::Text("- stage = %d",ch->arpStage);
          ImGui::Text("- ticks = %d",ch->arpTicks);
          ImGui::PopStyleColor();
          ImGui::Text("* Miscellaneous:");
          ImGui::TextColored(ch->doNote?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> Do Note");
          ImGui::TextColored(ch->legato?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> Legato");
          ImGui::TextColored(ch->portaStop?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> PortaStop");
          ImGui::TextColored(ch->keyOn?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> Key On");
          ImGui::TextColored(ch->keyOff?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> Key Off");
          ImGui::TextColored(ch->nowYouCanStop?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> NowYouCanStop");
          ImGui::TextColored(ch->stopOnOff?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> Stop on Off");
          ImGui::TextColored(ch->arpYield?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> Arp Yield");
          ImGui::TextColored(ch->delayLocked?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> DelayLocked");
          ImGui::TextColored(ch->inPorta?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> InPorta");
          ImGui::TextColored(ch->scheduledSlideReset?uiColors[GUI_COLOR_MACRO_VOLUME]:uiColors[GUI_COLOR_HEADER],">> SchedSlide");
        }
        ImGui::NextColumn();
      }
      ImGui::Columns();
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Playback Status")) {
      String pdi=e->getPlaybackDebugInfo();
      ImGui::TextWrapped("%s",pdi.c_str());
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Sample Debug")) {
      for (int i=0; i<e->song.sampleLen; i++) {
        DivSample* sample=e->getSample(i);
        if (sample==NULL) {
          ImGui::Text("%d: <NULL!>",i);
          continue;
        }
        if (ImGui::TreeNode(fmt::sprintf("%d: %s",i,sample->name).c_str())) {
          ImGui::Text("rate: %d",sample->rate);
          ImGui::Text("centerRate: %d",sample->centerRate);
          ImGui::Text("loopStart: %d",sample->loopStart);
          ImGui::Text("loopEnd: %d", sample->loopEnd);
          ImGui::Text(sample->loop?"loop: Enabled":"loop: Disabled");
          if (sampleLoopModes[sample->loopMode]!=NULL) {
            ImGui::Text("loopMode: %d (%s)",(unsigned char)sample->loopMode,sampleLoopModes[sample->loopMode]);
          } else {
            ImGui::Text("loopMode: %d (<NULL!>)",(unsigned char)sample->loopMode);
          }

          ImGui::Text("depth: %d",(unsigned char)sample->depth);
          ImGui::Text("length8: %d",sample->length8);
          ImGui::Text("length16: %d",sample->length16);
          ImGui::Text("length1: %d",sample->length1);
          ImGui::Text("lengthDPCM: %d",sample->lengthDPCM);
          ImGui::Text("lengthZ: %d",sample->lengthZ);
          ImGui::Text("lengthQSoundA: %d",sample->lengthQSoundA);
          ImGui::Text("lengthA: %d",sample->lengthA);
          ImGui::Text("lengthB: %d",sample->lengthB);
          ImGui::Text("lengthBRR: %d",sample->lengthBRR);
          ImGui::Text("lengthVOX: %d",sample->lengthVOX);

          ImGui::Text("samples: %d",sample->samples);
          ImGui::TreePop();
        }
      }
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Oscilloscope Debug")) {
      int c=0;
      for (int i=0; i<e->song.systemLen; i++) {
        DivSystem system=e->song.system[i];
        if (e->getChannelCount(system)>0) {
          if (ImGui::TreeNode(fmt::sprintf("%d: %s",i,e->getSystemName(system)).c_str())) {
            if (ImGui::BeginTable("OscilloscopeTable",4,ImGuiTableFlags_Borders|ImGuiTableFlags_SizingStretchSame)) {
              ImGui::TableSetupColumn("c0",ImGuiTableColumnFlags_WidthFixed);
              ImGui::TableSetupColumn("c1",ImGuiTableColumnFlags_WidthFixed);
              ImGui::TableSetupColumn("c2",ImGuiTableColumnFlags_WidthStretch);
              ImGui::TableSetupColumn("c3",ImGuiTableColumnFlags_WidthStretch);

              ImGui::TableNextRow();
              ImGui::TableNextColumn();
              ImGui::Text("Channel");
              ImGui::TableNextColumn();
              ImGui::Text("Follow");
              ImGui::TableNextColumn();
              ImGui::Text("Address");
              ImGui::TableNextColumn();
              ImGui::Text("Data");

              for (int j=0; j<e->getChannelCount(system); j++, c++) {
                DivDispatchOscBuffer* oscBuf=e->getOscBuffer(c);
                if (oscBuf==NULL) {
                  ImGui::TableNextRow();
                  // channel
                  ImGui::TableNextColumn();
                  ImGui::Text("%d",j);
                  ImGui::TableNextColumn();
                  ImGui::Text("<NULL!>");
                  continue;
                }
                ImGui::TableNextRow();
                // channel
                ImGui::TableNextColumn();
                ImGui::Text("%d",j);
                // follow
                ImGui::TableNextColumn();
                ImGui::Checkbox(fmt::sprintf("##%d_OSCFollow_%d",i,c).c_str(),&oscBuf->follow);
                // address
                ImGui::TableNextColumn();
                int needle=oscBuf->follow?oscBuf->needle:oscBuf->followNeedle;
                ImGui::BeginDisabled(oscBuf->follow);
                if (ImGui::InputInt(fmt::sprintf("##%d_OSCFollowNeedle_%d",i,c).c_str(),&needle,1,100)) {
                  oscBuf->followNeedle=MIN(MAX(needle,0),65535);
                }
                ImGui::EndDisabled();
                // data
                ImGui::TableNextColumn();
                ImGui::Text("%d",oscBuf->data[needle]);
              }
              ImGui::EndTable();
            }
            ImGui::TreePop();
          }
        } else {
          ImGui::Text("%d: <NULL!>",i);
          continue;
        }
      }
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Touch Point Information")) {
      ImGui::Text("active:");
      ImGui::Indent();
      for (TouchPoint& i: activePoints) {
        ImGui::Text("- %d: %.1f, %.1f (%.2f)",i.id,i.x,i.y,i.x);
      }
      ImGui::Unindent();
      ImGui::Text("pressed:");
      ImGui::Indent();
      for (TouchPoint& i: pressedPoints) {
        ImGui::Text("- %d: %.1f, %.1f (%.2f)",i.id,i.x,i.y,i.x);
      }
      ImGui::Unindent();
      ImGui::Text("released:");
      ImGui::Indent();
      for (TouchPoint& i: releasedPoints) {
        ImGui::Text("- %d: %.1f, %.1f (%.2f)",i.id,i.x,i.y,i.x);
      }
      ImGui::Unindent();
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("File Selection Test")) {
      if (ImGui::Button("Test Open")) {
        openFileDialog(GUI_FILE_TEST_OPEN);
      }
      ImGui::SameLine();
      if (ImGui::Button("Test Open Multi")) {
        openFileDialog(GUI_FILE_TEST_OPEN_MULTI);
      }
      ImGui::SameLine();
      if (ImGui::Button("Test Save")) {
        openFileDialog(GUI_FILE_TEST_SAVE);
      }
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Pitch Table Calculator")) {
      ImGui::InputDouble("Clock",&ptcClock);
      ImGui::InputDouble("Divider/FreqBase",&ptcDivider);
      ImGui::InputInt("Octave",&ptcOctave);
      if (ImGui::RadioButton("Frequency",ptcMode==0)) ptcMode=0;
      ImGui::SameLine();
      if (ImGui::RadioButton("Period",ptcMode==1)) ptcMode=1;
      ImGui::SameLine();
      if (ImGui::RadioButton("FreqNum/Block",ptcMode==2)) ptcMode=2;

      if (ptcMode==2) {
        if (ImGui::InputInt("FreqNum Bits",&ptcBlockBits)) {
          if (ptcBlockBits<0) ptcBlockBits=0;
          if (ptcBlockBits>13) ptcBlockBits=13;
        }
      }

      if (ImGui::BeginTable("PitchTable",7)) {
        ImGui::TableNextRow(ImGuiTableRowFlags_Headers);
        ImGui::TableNextColumn();
        ImGui::Text("Note");
        ImGui::TableNextColumn();
        ImGui::Text("Pitch");

        ImGui::TableNextColumn();
        ImGui::Text("Base");
        ImGui::TableNextColumn();
        ImGui::Text("Hex");

        ImGui::TableNextColumn();
        ImGui::Text("Final");

        ImGui::TableNextColumn();
        ImGui::Text("Hex");

        ImGui::TableNextColumn();
        ImGui::Text("Delta");

        int lastFinal=0;
        for (int i=0; i<12; i++) {
          int note=(12*ptcOctave)+i;
          int pitch=0;

          int base=e->calcBaseFreq(ptcClock,ptcDivider,note,ptcMode==1);
          int final=e->calcFreq(base,pitch,ptcMode==1,0,0,ptcClock,ptcDivider,(ptcMode==2)?ptcBlockBits:0);

          ImGui::TableNextRow();
          ImGui::TableNextColumn();
          ImGui::Text("%d",note);
          ImGui::TableNextColumn();
          ImGui::Text("%d",pitch);

          ImGui::TableNextColumn();
          ImGui::Text("%d",base);
          ImGui::TableNextColumn();
          ImGui::Text("%x",base);

          ImGui::TableNextColumn();
          ImGui::Text("%d",final);
          ImGui::TableNextColumn();
          ImGui::Text("%x",final);

          ImGui::TableNextColumn();
          ImGui::Text("%d",final-lastFinal);

          lastFinal=final;
        }

        ImGui::EndTable();
      }
      ImGui::TreePop();
    }
    if (ImGui::TreeNodeEx("Window Debug",ImGuiTreeNodeFlags_DefaultOpen)) {
      ImGui::Text("Screen: %dx%d+%d+%d",scrW,scrH,scrX,scrY);
      ImGui::Text("Screen (Conf): %dx%d+%d+%d",scrConfW,scrConfH,scrConfX,scrConfY);
      ImGui::Text("Canvas: %dx%d",canvasW,canvasH);
      ImGui::Text("Maximized: %d",scrMax);
      ImGui::Text("System Managed Scale: %d",sysManagedScale);
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Visualizer Debug")) {
      if (ImGui::BeginTable("visX",3,ImGuiTableFlags_Borders)) {
        ImGui::TableNextRow(ImGuiTableRowFlags_Headers);
        ImGui::TableNextColumn();
        ImGui::Text("channel");
        ImGui::TableNextColumn();
        ImGui::Text("patChanX");
        ImGui::TableNextColumn();
        ImGui::Text("patChanSlideY");

        for (int i=0; i<e->getTotalChannelCount(); i++) {
          ImGui::TableNextRow();
          ImGui::TableNextColumn();
          ImGui::Text("%d",i);
          ImGui::TableNextColumn();
          ImGui::Text("%f",patChanX[i]);
          ImGui::TableNextColumn();
          ImGui::Text("%f",patChanSlideY[i]);
        }

        ImGui::EndTable();
      }
      
      ImGui::Text("particle count: %d",(int)particles.size());

      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Playground")) {
      if (pgSys<0 || pgSys>=e->song.systemLen) pgSys=0;
      if (ImGui::BeginCombo("Chip",fmt::sprintf("%d. %s",pgSys+1,e->getSystemName(e->song.system[pgSys])).c_str())) {
        for (int i=0; i<e->song.systemLen; i++) {
          if (ImGui::Selectable(fmt::sprintf("%d. %s",i+1,e->getSystemName(e->song.system[i])).c_str())) {
            pgSys=i;
            break;
          }
        }
        ImGui::EndCombo();
      }
      ImGui::Text("Program");
      if (pgProgram.empty()) {
        ImGui::Text("-nothing here-");
      } else {
        char id[32];
        for (size_t index=0; index<pgProgram.size(); index++) {
          DivRegWrite& i=pgProgram[index];
          snprintf(id,31,"pgw%d",(int)index);
          ImGui::PushID(id);
          ImGui::SetNextItemWidth(100.0f*dpiScale);
          ImGui::InputScalar("##PAddress",ImGuiDataType_U32,&i.addr,NULL,NULL,"%.2X",ImGuiInputTextFlags_CharsHexadecimal);
          ImGui::SameLine();
          ImGui::Text("=");
          ImGui::SameLine();
          ImGui::SetNextItemWidth(100.0f*dpiScale);
          ImGui::InputScalar("##PValue",ImGuiDataType_U16,&i.val,NULL,NULL,"%.2X",ImGuiInputTextFlags_CharsHexadecimal);
          ImGui::SameLine();
          if (ImGui::Button(ICON_FA_TIMES "##PRemove")) {
            pgProgram.erase(pgProgram.begin()+index);
            index--;
          }
          ImGui::PopID();
        }
      }
      if (ImGui::Button("Execute")) {
        e->poke(pgSys,pgProgram);
      }
      ImGui::SameLine();
      if (ImGui::Button("Clear")) {
        pgProgram.clear();
      }
      
      ImGui::Text("Address");
      ImGui::SameLine();
      ImGui::SetNextItemWidth(100.0f*dpiScale);
      ImGui::InputInt("##PAddress",&pgAddr,0,0,ImGuiInputTextFlags_CharsHexadecimal);
      ImGui::SameLine();
      ImGui::Text("Value");
      ImGui::SameLine();
      ImGui::SetNextItemWidth(100.0f*dpiScale);
      ImGui::InputInt("##PValue",&pgVal,0,0,ImGuiInputTextFlags_CharsHexadecimal);
      ImGui::SameLine();
      if (ImGui::Button("Write")) {
        e->poke(pgSys,pgAddr,pgVal);
      }
      ImGui::SameLine();
      if (ImGui::Button("Add")) {
        pgProgram.push_back(DivRegWrite(pgAddr,pgVal));
      }
      if (ImGui::TreeNode("Register Cheatsheet")) {
        const char** sheet=e->getRegisterSheet(pgSys);
        if (sheet==NULL) {
          ImGui::Text("no cheatsheet available for this chip.");
        } else {
          if (ImGui::BeginTable("RegisterSheet",2,ImGuiTableFlags_SizingFixedSame)) {
            ImGui::TableNextRow();
            ImGui::TableNextColumn();
            ImGui::Text("Name");
            ImGui::TableNextColumn();
            ImGui::Text("Address");
            for (int i=0; sheet[i]!=NULL; i+=2) {
              ImGui::TableNextRow();
              ImGui::TableNextColumn();
              ImGui::Text("%s",sheet[i]);
              ImGui::TableNextColumn();
              ImGui::Text("$%s",sheet[i+1]);
            }
            ImGui::EndTable();
          }
        }
        ImGui::TreePop();
      }
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("ADSR Test Area")) {
      static int tl, ar, dr, d2r, sl, rr, sus, egt, algOrGlobalSus, instType;
      static float maxArDr, maxTl, maxRr;
      ImGui::Text("This window was done out of frustration");
      drawFMEnv(tl,ar,dr,d2r,rr,sl,sus,egt,algOrGlobalSus,maxTl,maxArDr,maxRr,ImVec2(200.0f*dpiScale,100.0f*dpiScale),instType);

      ImGui::InputInt("tl",&tl);
      ImGui::InputInt("ar",&ar);
      ImGui::InputInt("dr",&dr);
      ImGui::InputInt("d2r",&d2r);
      ImGui::InputInt("sl",&sl);
      ImGui::InputInt("rr",&rr);
      ImGui::InputInt("sus",&sus);
      ImGui::InputInt("egt",&egt);
      ImGui::InputInt("algOrGlobalSus",&algOrGlobalSus);
      ImGui::InputInt("instType",&instType);
      ImGui::InputFloat("maxArDr",&maxArDr);
      ImGui::InputFloat("maxTl",&maxTl);
      ImGui::InputFloat("maxRr",&maxRr);
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("FM Preview")) {
      float asFloat[FM_PREVIEW_SIZE];
      for (int i=0; i<FM_PREVIEW_SIZE; i++) {
        asFloat[i]=(float)fmPreview[i]/8192.0f;
      }
      ImGui::PlotLines("##DebugFMPreview",asFloat,FM_PREVIEW_SIZE,0,"Preview",-1.0,1.0,ImVec2(300.0f*dpiScale,150.0f*dpiScale));
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("User Interface")) {
      if (ImGui::Button("Inspect")) {
        inspectorOpen=!inspectorOpen;
      }
      if (ImGui::Button("Spoiler")) {
        spoilerOpen=!spoilerOpen;
      }
      if (ImGui::Button("Kill Graphics")) {
        killGraphics=true;
      }
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Performance")) {
      double perfFreq=SDL_GetPerformanceFrequency()/1000000.0;
      int lastProcTime=(int)e->processTime/1000;
      TAAudioDesc& audioGot=e->getAudioDescGot();

      ImGui::Text("video frame: %.0fµs",ImGui::GetIO().DeltaTime*1000000.0);
      ImGui::Text("audio frame: %.0fµs",1000000.0*(double)audioGot.bufsize/(double)audioGot.rate);
      ImGui::Separator();

      ImGui::Text("audio: %dµs",lastProcTime);
      ImGui::Text("render: %.0fµs",(double)renderTimeDelta/perfFreq);
      ImGui::Text("draw: %.0fµs",(double)drawTimeDelta/perfFreq);
      ImGui::Text("layout: %.0fµs",(double)layoutTimeDelta/perfFreq);
      ImGui::Text("event: %.0fµs",(double)eventTimeDelta/perfFreq);
      ImGui::Separator();

      ImGui::Text("details:");
      for (int i=0; i<perfMetricsLastLen; i++) {
        ImGui::Text("%s: %.0fµs",perfMetricsLast[i].name,(double)perfMetricsLast[i].elapsed/perfFreq);
      }
      ImGui::TreePop();
    }
    if (ImGui::TreeNode("Settings")) {
      if (ImGui::Button("Sync")) syncSettings();
      ImGui::SameLine();
      if (ImGui::Button("Commit")) commitSettings();
      ImGui::SameLine();
      if (ImGui::Button("Force Load")) e->loadConf();
      ImGui::SameLine();
      if (ImGui::Button("Force Save")) e->saveConf();
      ImGui::TreePop();
    }
    ImGui::Text("Song format version %d",e->song.version);
    ImGui::Text("Furnace version " DIV_VERSION " (%d)",DIV_ENGINE_VERSION);
  }
  if (ImGui::IsWindowFocused(ImGuiFocusedFlags_ChildWindows)) curWindow=GUI_WINDOW_DEBUG;
  ImGui::End();
}