/*
-----------------------------------------------------------------------------
This source file is part of OpenSpace3D
For the latest info, see http://www.openspace3d.com

Copyright (c) 2012 I-maginer

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt

-----------------------------------------------------------------------------
*/

struct PlugAnimSwitch = [
  PANIMSWITCH_inst             : PInstance,
  PANIMSWITCH_defaultAnim      : V3Danim,
  PANIMSWITCH_defaultLoop      : I,
  PANIMSWITCH_prevAnims        : [V3Danim r1],
  PANIMSWITCH_currentAnim      : V3Danim,
  PANIMSWITCH_targetAnim       : V3Danim,
  PANIMSWITCH_nextAnim         : V3Danim,
  PANIMSWITCH_fSpeed           : F,
  PANIMSWITCH_iTick            : I,
  PANIMSWITCH_bAuto            : I,
  PANIMSWITCH_bEnable          : I,
  PANIMSWITCH_bWaitEnd         : I,
  PANIMSWITCH_lastAnimEvent    : V3Danim
  
  ]mkPlugAnimSwitch;;


fun isAnimInList(l, anim)=
  if (l == nil) then 0 else
  let l -> [elt next] in
  if (elt == anim) then
    1
  else
    isAnimInList tl l anim;;


fun deleteOb(inst, panimstr)=
  V3DsetAnimationLoop panimstr.PANIMSWITCH_defaultAnim panimstr.PANIMSWITCH_defaultLoop;
  
  while (panimstr.PANIMSWITCH_prevAnims != nil) do
  (
    V3DstopAnimation hd panimstr.PANIMSWITCH_prevAnims;
    set panimstr.PANIMSWITCH_prevAnims = tl panimstr.PANIMSWITCH_prevAnims;
  );
  
  V3DstopAnimation panimstr.PANIMSWITCH_currentAnim;
  V3DstopAnimation panimstr.PANIMSWITCH_defaultAnim;
  V3DstopAnimation panimstr.PANIMSWITCH_targetAnim;
  setPluginInstanceCbPreRender inst nil;
  0;;


fun cbGetAnimTransition(inst, view3d, panimstr)=
  let (itof (_tickcount - panimstr.PANIMSWITCH_iTick)) -> deltatime in
  let panimstr.PANIMSWITCH_currentAnim -> canim in
  (   
    if ((panimstr.PANIMSWITCH_targetAnim == nil) || (panimstr.PANIMSWITCH_targetAnim == panimstr.PANIMSWITCH_currentAnim)) then nil else
    (
      let V3DgetAnimationWeight panimstr.PANIMSWITCH_currentAnim -> weight1 in
      let V3DgetAnimationWeight panimstr.PANIMSWITCH_targetAnim -> weight2 in
      (
        let panimstr.PANIMSWITCH_prevAnims -> lanims in
        while (lanims != nil) do
        (
          let hd lanims -> oanim in
          let V3DgetAnimationWeight oanim -> oweight in
          (
            if (oweight == 0.0) then nil else
            let if (panimstr.PANIMSWITCH_fSpeed == 0.0) then 0.0 else oweight -. (deltatime /. panimstr.PANIMSWITCH_fSpeed) -> noweight in
            (
              V3DsetAnimationWeight oanim (SO3MathsClampValue noweight 0.0 1.0);
              if (!V3DgetAnimationState oanim) || (noweight >. 0.0) then nil else
              (
                V3DsetAnimationPosition oanim V3DgetAnimationLength oanim;
                V3DpauseAnimation oanim;
                set panimstr.PANIMSWITCH_prevAnims = remove_from_list panimstr.PANIMSWITCH_prevAnims oanim;
              );
            );
          );
          set lanims = tl lanims;
        );
      
        if (weight1 == 0.0) || (panimstr.PANIMSWITCH_targetAnim == nil) then nil else
        let if (panimstr.PANIMSWITCH_fSpeed == 0.0) then 0.0 else weight1 -. (deltatime /. panimstr.PANIMSWITCH_fSpeed) -> nweight in
        (
          V3DsetAnimationWeight panimstr.PANIMSWITCH_currentAnim (SO3MathsClampValue nweight 0.0 1.0);
          if (!V3DgetAnimationState panimstr.PANIMSWITCH_currentAnim) || (nweight >. 0.0) then nil else
          (
            V3DsetAnimationPosition panimstr.PANIMSWITCH_currentAnim V3DgetAnimationLength panimstr.PANIMSWITCH_currentAnim;
            V3DpauseAnimation panimstr.PANIMSWITCH_currentAnim;
          );
        );
        
        if (weight2 >=. 1.0) then nil else
        let if (panimstr.PANIMSWITCH_fSpeed == 0.0) then 1.0 else weight2 +. (deltatime /. panimstr.PANIMSWITCH_fSpeed) -> nweight in
        (
          V3DsetAnimationWeight panimstr.PANIMSWITCH_targetAnim (SO3MathsClampValue nweight 0.0 1.0);
        );
        
        let (weight1 <=. 0.0) && (weight2 >=. 1.0) && panimstr.PANIMSWITCH_prevAnims == nil -> end in
        if !end then nil else
        (
          set panimstr.PANIMSWITCH_currentAnim = panimstr.PANIMSWITCH_targetAnim;
          set panimstr.PANIMSWITCH_targetAnim = nil;
          
          /*let V3DgetAnimationLoop panimstr.PANIMSWITCH_currentAnim -> loop in
          if (!loop || (panimstr.PANIMSWITCH_nextAnim == nil)) then nil else
          (
            setPluginInstanceCbPreRender inst nil;
            set panimstr.PANIMSWITCH_iTick = nil;
          );*/
        );    
      );
    );
    
    // when an animation is not in loop we get back to the default animation before the animation end
    let (V3DgetAnimationLength panimstr.PANIMSWITCH_currentAnim) -. (V3DgetAnimationPosition panimstr.PANIMSWITCH_currentAnim) -> trest in
    let if (panimstr.PANIMSWITCH_currentAnim != panimstr.PANIMSWITCH_targetAnim) then 
          if (trest >. (if (panimstr.PANIMSWITCH_fSpeed == 0.0) then 0.0 else (panimstr.PANIMSWITCH_fSpeed /. 1000.0))) then
            0
          else
            1
        else
          if (trest >=. 0.1) then
            0
          else
            1
    -> timetochange in
    if (!timetochange) then nil else
    (
      let V3DgetAnimationLoop panimstr.PANIMSWITCH_currentAnim -> loop in
      if (panimstr.PANIMSWITCH_bAuto && (!loop) && (panimstr.PANIMSWITCH_nextAnim == nil) && ((panimstr.PANIMSWITCH_targetAnim == nil) || (panimstr.PANIMSWITCH_currentAnim == panimstr.PANIMSWITCH_targetAnim))) then
      (
        // reset to default anim
        set panimstr.PANIMSWITCH_prevAnims = remove_from_list panimstr.PANIMSWITCH_prevAnims panimstr.PANIMSWITCH_currentAnim;
        
        set panimstr.PANIMSWITCH_targetAnim = panimstr.PANIMSWITCH_defaultAnim;
        
        if (panimstr.PANIMSWITCH_fSpeed == 0.0) then nil else
          V3DsetAnimationWeight panimstr.PANIMSWITCH_targetAnim 0.0;
        
        V3DsetAnimationPosition panimstr.PANIMSWITCH_targetAnim 0.0;
        V3DplayAnimation panimstr.PANIMSWITCH_targetAnim;
        0;
      )
      else if (panimstr.PANIMSWITCH_nextAnim != nil) then
      (
        if (panimstr.PANIMSWITCH_targetAnim == nil) then nil else
        (
          set panimstr.PANIMSWITCH_prevAnims = remove_from_list panimstr.PANIMSWITCH_prevAnims panimstr.PANIMSWITCH_targetAnim;          
          set panimstr.PANIMSWITCH_currentAnim = panimstr.PANIMSWITCH_targetAnim;
        );
        
        set panimstr.PANIMSWITCH_prevAnims = remove_from_list panimstr.PANIMSWITCH_prevAnims panimstr.PANIMSWITCH_nextAnim;
        set panimstr.PANIMSWITCH_targetAnim = panimstr.PANIMSWITCH_nextAnim;
        
        if (panimstr.PANIMSWITCH_currentAnim == panimstr.PANIMSWITCH_targetAnim) then nil else
        if (((V3DgetAnimationWeight panimstr.PANIMSWITCH_targetAnim) != 1.0) || (panimstr.PANIMSWITCH_fSpeed == 0.0)) then nil else
          V3DsetAnimationWeight panimstr.PANIMSWITCH_targetAnim 0.0;
        
        if (V3DgetAnimationLoop panimstr.PANIMSWITCH_targetAnim) then nil else
          V3DsetAnimationPosition panimstr.PANIMSWITCH_targetAnim 0.0;
        
        V3DplayAnimation panimstr.PANIMSWITCH_targetAnim;
        set panimstr.PANIMSWITCH_nextAnim = nil;
        0;
      );
      
      //let V3DgetAnimationLoop canim -> loop in
      if (canim == panimstr.PANIMSWITCH_lastAnimEvent) then nil else
      (
        // manage the instantiate case where the ressource name is rewritten
        let canim.V3D_sAnimName -> animname in
        let strcat (strreplace inst.INST_groupstr.GRP_project.PRJ_sName " " "_") "." -> basename in
        let if (!strcmp basename (substr animname 0 (strlen basename))) then substr animname (strlen basename) 1024 else animname -> evtname in
          SendPluginEvent inst strcat evtname " end" nil nil;

        set panimstr.PANIMSWITCH_lastAnimEvent = canim;
      );
      0;
    );
  );
  
  set panimstr.PANIMSWITCH_iTick = _tickcount;
  0;;


fun cbSwitchAnimation(inst, from, action, param, rep, p)=
  let p -> [anim panimstr] in
  if (!panimstr.PANIMSWITCH_bEnable) then nil else
  (
    if (panimstr.PANIMSWITCH_lastAnimEvent != anim) then nil else
      set panimstr.PANIMSWITCH_lastAnimEvent = nil;
    
    if (panimstr.PANIMSWITCH_bWaitEnd) then
    (
      set panimstr.PANIMSWITCH_nextAnim = anim;
      if (panimstr.PANIMSWITCH_iTick != nil) then nil else
        set panimstr.PANIMSWITCH_iTick = _tickcount;
      
      setPluginInstanceCbPreRender inst mkfun3 @cbGetAnimTransition panimstr;    
      0;
    )
    else if (anim == panimstr.PANIMSWITCH_targetAnim) || ((panimstr.PANIMSWITCH_targetAnim == nil) && (anim == panimstr.PANIMSWITCH_currentAnim)) then nil else
    (
      // when we call a new switch before a transition end we force the target animation to weight 1.0
      if (panimstr.PANIMSWITCH_targetAnim == nil) then nil else
      (
        if (((V3DgetAnimationWeight panimstr.PANIMSWITCH_targetAnim) != 0.0) || (panimstr.PANIMSWITCH_fSpeed == 0.0)) then nil else
          V3DsetAnimationWeight panimstr.PANIMSWITCH_targetAnim 1.0;
        
        if (isAnimInList panimstr.PANIMSWITCH_prevAnims panimstr.PANIMSWITCH_currentAnim) then nil else
          set panimstr.PANIMSWITCH_prevAnims = panimstr.PANIMSWITCH_currentAnim::panimstr.PANIMSWITCH_prevAnims;
        
        if (!isAnimInList panimstr.PANIMSWITCH_prevAnims panimstr.PANIMSWITCH_targetAnim) then nil else
          set panimstr.PANIMSWITCH_prevAnims = remove_from_list panimstr.PANIMSWITCH_prevAnims panimstr.PANIMSWITCH_targetAnim;
        
        set panimstr.PANIMSWITCH_currentAnim = panimstr.PANIMSWITCH_targetAnim;
      );
      
      if (!isAnimInList panimstr.PANIMSWITCH_prevAnims anim) then nil else
        set panimstr.PANIMSWITCH_prevAnims = remove_from_list panimstr.PANIMSWITCH_prevAnims anim;
      
      set panimstr.PANIMSWITCH_targetAnim = anim;
      
      if (((V3DgetAnimationWeight panimstr.PANIMSWITCH_targetAnim) != 1.0) || (panimstr.PANIMSWITCH_fSpeed == 0.0)) then nil else
        V3DsetAnimationWeight panimstr.PANIMSWITCH_targetAnim 0.0;
      
      if (V3DgetAnimationLoop panimstr.PANIMSWITCH_targetAnim) then nil else
        V3DsetAnimationPosition panimstr.PANIMSWITCH_targetAnim 0.0;
      
      V3DplayAnimation panimstr.PANIMSWITCH_targetAnim;
      
      if (panimstr.PANIMSWITCH_iTick != nil) then nil else
        set panimstr.PANIMSWITCH_iTick = _tickcount;
      
      setPluginInstanceCbPreRender inst mkfun3 @cbGetAnimTransition panimstr;
      0;
    );
    0;
  );
  0;;


fun cbEnable(inst, from, action, param, rep, panimstr)=
  if (panimstr.PANIMSWITCH_bEnable) then nil else
  (
    // force loop mode for default animation
    if (!panimstr.PANIMSWITCH_bAuto) then nil else
      V3DsetAnimationLoop panimstr.PANIMSWITCH_defaultAnim 1;
    
    V3DsetAnimationWeight panimstr.PANIMSWITCH_defaultAnim 1.0;
    V3DsetAnimationPosition panimstr.PANIMSWITCH_defaultAnim 0.0;
    V3DplayAnimation panimstr.PANIMSWITCH_defaultAnim;
    
    set panimstr.PANIMSWITCH_currentAnim = panimstr.PANIMSWITCH_defaultAnim;
    set panimstr.PANIMSWITCH_targetAnim = nil;
    set panimstr.PANIMSWITCH_bEnable = 1;
    set panimstr.PANIMSWITCH_prevAnims = nil;
    set panimstr.PANIMSWITCH_nextAnim = nil;
    set panimstr.PANIMSWITCH_iTick = nil;
    set panimstr.PANIMSWITCH_lastAnimEvent = nil;
  );
  0;;


fun cbDisable(inst, from, action, param, rep, panimstr)=
  if (!panimstr.PANIMSWITCH_bEnable) then nil else
  (
    setPluginInstanceCbPreRender inst nil;
    
    while (panimstr.PANIMSWITCH_prevAnims != nil) do
    (
      let hd panimstr.PANIMSWITCH_prevAnims -> panim in
      (
        V3DstopAnimation panim;
        V3DsetAnimationWeight panim 1.0;
        V3DsetAnimationPosition panim 0.0;
      );
      set panimstr.PANIMSWITCH_prevAnims = tl panimstr.PANIMSWITCH_prevAnims;
    );
    
    V3DstopAnimation panimstr.PANIMSWITCH_currentAnim;
    V3DsetAnimationWeight panimstr.PANIMSWITCH_currentAnim 1.0;
    V3DsetAnimationPosition panimstr.PANIMSWITCH_currentAnim 0.0;
    
    V3DstopAnimation panimstr.PANIMSWITCH_targetAnim;
    V3DsetAnimationWeight panimstr.PANIMSWITCH_targetAnim 1.0;
    V3DsetAnimationPosition panimstr.PANIMSWITCH_targetAnim 0.0;
    
    V3DstopAnimation panimstr.PANIMSWITCH_defaultAnim;
    V3DsetAnimationWeight panimstr.PANIMSWITCH_defaultAnim 1.0;
    V3DsetAnimationPosition panimstr.PANIMSWITCH_defaultAnim 0.0;
    
    set panimstr.PANIMSWITCH_bEnable = 0;
  );
  0;;


fun loadAnimations(inst, panimstr)=
  let 0 -> i in
  let getPluginInstanceParam inst (strcat "animation_" (itoa i)) -> elem in
  while (elem != nil) do
  (
    //keep default also
    //if (!strcmp elem panimstr.PANIMSWITCH_defaultAnim.V3D_sAnimName) then nil else
    let V3DgetAnimationByName c3dXsession elem -> anim in
    
    // manage the instantiate case where the ressource name is rewritten
    let strcat (strreplace inst.INST_groupstr.GRP_project.PRJ_sName " " "_") "." -> basename in
    let if (!strcmp basename (substr elem 0 (strlen basename))) then substr elem (strlen basename) 1024 else elem -> actname in
    (
      PluginRegisterAction inst actname mkfun6 @cbSwitchAnimation [anim panimstr];
    );

    set i = i + 1;
    set elem = getPluginInstanceParam inst (strcat "animation_" (itoa i));
  );
  0;;


fun newOb(inst)=
  let getPluginInstanceParam inst "defaultAnim" -> defanim in
  let atoi (getPluginInstanceParam inst "autoSwitch") -> autoswitch in
  let if autoswitch == nil then 1 else autoswitch -> autoswitch in
  let atoi (getPluginInstanceParam inst "init") -> init in
  let if init == nil then 1 else init -> init in
  let atof (getPluginInstanceParam inst "transitionSpeed") -> speed in
  let if speed == nil then 200.0 else speed -> speed in
  let atoi (getPluginInstanceParam inst "waitend") -> waitend in
  let if waitend == nil then 0 else waitend -> waitend in
  
  let V3DgetAnimationByName c3dXsession defanim -> defanimstr in
  let V3DgetAnimationLoop defanimstr -> loop in
  let mkPlugAnimSwitch [inst defanimstr loop nil defanimstr nil nil speed nil autoswitch 0 waitend nil] -> panimstr in
  (
    loadAnimations inst panimstr;
    PluginRegisterAction inst "Default" mkfun6 @cbSwitchAnimation [defanimstr panimstr];
    PluginRegisterAction inst "Enable" mkfun6 @cbEnable panimstr;
    PluginRegisterAction inst "Disable" mkfun6 @cbDisable panimstr;
    
    if (!init) then nil else
      cbEnable inst nil nil nil nil panimstr;
    
    setPluginInstanceCbDel inst mkfun2 @deleteOb panimstr;
  );
  0;;


fun IniPlug(file)=
  PlugRegister @newOb nil;
  setPluginEditor @dynamicedit;
  0;;