import test from 'node:test'
import assert from 'node:assert/strict'
import { polygon, lineString, featureCollection } from '@turf/turf'
import { candidateFootprint, isSafeOldTownPlacement } from './oldtown-geometry.mjs'

const mask = polygon([[[0,0],[.01,0],[.01,.01],[0,.01],[0,0]]])
const at = (lon, lat, width=8, depth=7) => ({lon,lat,width,depth,heading:0})

test('rejects a rotated candidate footprint crossing the residential mask edge', () => {
  const footprint = candidateFootprint(at(.00999,.005,30,12))
  assert.equal(isSafeOldTownPlacement(footprint,{mask,roads:[],water:[],existing:[],modeled:[],accepted:[]}),false)
})

test('rejects a footprint intersecting an existing building even if its center lies outside', () => {
  const footprint = candidateFootprint(at(.005,.005,16,8))
  const existing = polygon([[[.00505,.00498],[.00512,.00498],[.00512,.00502],[.00505,.00502],[.00505,.00498]]])
  assert.equal(isSafeOldTownPlacement(footprint,{mask,roads:[],water:[],existing:[existing],modeled:[],accepted:[]}),false)
})

test('rejects collision with a previously accepted procedural footprint', () => {
  const first = candidateFootprint(at(.005,.005,10,8))
  const second = candidateFootprint(at(.00504,.005,10,8))
  assert.equal(isSafeOldTownPlacement(second,{mask,roads:[],water:[],existing:[],modeled:[],accepted:[first]}),false)
})

test('rejects roads, waterways and already-modeled regular-estate roofs', () => {
  const footprint = candidateFootprint(at(.005,.005))
  const road = lineString([[.004,.005],[.006,.005]])
  const water = polygon([[[.004,.004],[.006,.004],[.006,.006],[.004,.006],[.004,.004]]])
  for (const options of [
    {roads:[road]},
    {water:[water]},
    {modeled:[water]},
  ]) assert.equal(isSafeOldTownPlacement(footprint,{mask,roads:[],water:[],existing:[],modeled:[],accepted:[],...options}),false)
})

test('accepts a non-overlapping candidate inside a valid residential mask', () => {
  const footprint = candidateFootprint(at(.005,.005))
  assert.equal(isSafeOldTownPlacement(footprint,{mask,roads:[],water:[],existing:[],modeled:[],accepted:[]}),true)
})