"""Exercise the shipped paper framing calculation; native rendering is separate."""
from policy_harness import ROOT, body, run
source = ROOT / 'addons/core/Scripts/Game/ERR/30_Map/ERRM_SharedMapComponent.c'
method = body(source, 'static bool FitPaperView(').replace('inout float zoom', 'float& zoom').replace('out vector centre', 'vector& centre').replace('Math.Max', 'maxf').replace('Math.Clamp', 'clampf')
run(r'''
#include <array>
#include <algorithm>
#include <cassert>
#include <cmath>
using vector = std::array<float, 3>;
float maxf(float a,float b){return std::max(a,b);}
float clampf(float x,float lo,float hi){return std::clamp(x,lo,hi);}
''' + method + r'''
void check(vector pos, vector offset, vector size, float width, float height) {
 float zoom=0.12f;vector centre{};
 assert(FitPaperView(pos,offset,size,width,height,zoom,centre));
 float halfX=width/(2*zoom),halfZ=height/(2*zoom);
 assert(centre[0]-halfX>=offset[0]-0.01f);
 assert(centre[2]-halfZ>=offset[2]-0.01f);
 assert(centre[0]+halfX<=offset[0]+size[0]+0.01f);
 assert(centre[2]+halfZ<=offset[2]+size[2]+0.01f);
 // Keep an in-bounds holder on the paper even when its centre must shift.
 for(int axis:{0,2}) if(pos[axis]>=offset[axis]&&pos[axis]<=offset[axis]+size[axis]) {
  float half=axis==0?halfX:halfZ;
  assert(std::abs(pos[axis]-centre[axis])<=half+2/zoom+0.01f);
 }
}
int main() {
 vector size{15360,0,15360},origin{0,0,0};
 // Actual Chernarus failure: captured north edge was 16610, beyond 15360.
 check({5556.82f,465.062f,14906.5f},origin,size,296.05f,407.467f);
 for(float x:{0.f,50.f,7680.f,15310.f,15360.f})
  for(float z:{0.f,50.f,7680.f,15310.f,15360.f})
   for(auto resolution: {vector{155,213,0},vector{858,1181,0},vector{1488,2048,0}})
    check({x,0,z},origin,size,resolution[0],resolution[1]);
 check({-4000,0,15000},{-4096,0,10240},{8192,0,6144},858,1181);
 check({0,0,0},origin,{1024,0,512},1488,2048); // zoom in to fit a small terrain
 check({20000,0,20000},origin,size,858,1181); // a terrain carrier outside map bounds
 float zoom=.12f;vector centre{};
 assert(FitPaperView({7680,0,7680},origin,size,744,1024,zoom,centre));
 assert(zoom==.12f&&centre[0]==7680&&centre[2]==7680); // interior framing unchanged
 assert(!FitPaperView(origin,origin,{0,0,15360},744,1024,zoom,centre));
 assert(!FitPaperView(origin,origin,size,0,1024,zoom,centre));
}
''')
print('PASS: actual paper framing stays inside terrain bounds at edges, corners, shifted origins and different resolutions; small terrains fit by zooming')