import test from 'node:test';
import assert from 'node:assert/strict';
import {SectionVoxelMap} from '../section-voxel-map.js';
import {TerrainController} from '../terrain-controller.js';
import {TerrainState} from '../terrain-state.js';
import {buildBlockLight} from '../block-light.js';
import {buildSectionMesh} from '../mesh-geometry.js';
test('authoritative columns keep a cave dark when the roof is above the loaded vertical window',()=>{
 const world=new SectionVoxelMap();world.setSection('0,0,0',new Uint32Array(4096));
 const bounds={min:[0,0,0],max:[15,15,15]},columns=new Map([['0,0',new Int16Array(256).fill(30)]]);
 assert.equal(buildBlockLight(world,new Map(),bounds,columns).sample([8,8,8]).skyLevel,0);
 columns.get('0,0').fill(-1);
 assert.equal(buildBlockLight(world,new Map(),bounds,columns).sample([8,8,8]).skyLevel,15);
});
test('compact controller transfers section copies and preserves the main collision buffers',()=>{
 const packets=[],worker={postMessage(p,transfers){packets.push(structuredClone(p,{transfer:transfers}));},terminate(){}};
 const c=new TerrainController({workerFactory:()=>worker}),world=new SectionVoxelMap();
 const cells=new Uint32Array(4096).fill(3);world.setSection('0,0,0',cells);
 const materials=new Map([[3,{state:'minecraft:stone',color:[128,128,128]}]]);
 c.reset(world,materials,new Map(),{min:[0,0,0],max:[15,15,15]});c.flush();
 assert.equal(cells.byteLength,16384);assert.equal(packets[0].initial,null);assert.equal(packets[0].compact,true);assert.equal(packets[0].sections[0].cells[0],3);
 const state=new TerrainState(null);state.sync(packets[0]);assert.equal(state.blocks.getAt(0,0,0),3);
 c.update({unload:[[0,0,0]]});c.update({sections:[{section:[0,0,0],cells:new Uint32Array(4096)}]});c.flush();state.sync(packets[1]);
 assert.equal(state.blocks.hasSection('0,0,0'),true);assert.equal(state.blocks.size,0);c.dispose();
});
test('section-local mesh coordinates retain fractional geometry near the world border',()=>{
 const world=new SectionVoxelMap(),x=29_999_840;world.set(`${x},0,0`,1);
 const materials=new Map([[1,{state:'custom:partial',color:[128,128,128],render:[{min:[.125,.25,.125],max:[.875,.75,.875]}]}]]);
 const result=buildSectionMesh({id:`${x/16},0,0`,blocks:world,materials,localCoordinates:true});
 assert.deepEqual(result.origin,[x,0,0]);
 const xs=[];for(let i=0;i<result.vertices.length;i+=20)xs.push(result.vertices[i]);
 assert.equal(Math.min(...xs),.125);assert.equal(Math.max(...xs),.875);
});