import test from 'node:test'
import assert from 'node:assert/strict'

import { mergeMapPoints } from '../src/utils/gisMapClustering.js'

function projectPoint({ lng, lat }) {
  return { x: lng * 100, y: lat * 100 }
}

test('mergeMapPoints keeps distant points as individual markers', () => {
  const points = [
    { id: 'a', lng: 110.3, lat: 28.4 },
    { id: 'b', lng: 111, lat: 29 }
  ]

  const merged = mergeMapPoints(points, projectPoint, 48)

  assert.equal(merged.length, 2)
  assert.deepEqual(merged.map(item => item.type), ['point', 'point'])
  assert.deepEqual(merged.map(item => item.point.id), ['a', 'b'])
})

test('mergeMapPoints combines nearby points into one countable cluster', () => {
  const points = [
    { id: 'a', lng: 110.3, lat: 28.4, iconUrl: 'green.png' },
    { id: 'b', lng: 110.3005, lat: 28.4004, iconUrl: 'red.png' }
  ]

  const merged = mergeMapPoints(points, projectPoint, 48)

  assert.equal(merged.length, 1)
  assert.equal(merged[0].type, 'cluster')
  assert.equal(merged[0].count, 2)
  assert.deepEqual(merged[0].points.map(point => point.id), ['a', 'b'])
})

test('mergeMapPoints keeps the average render position for a cluster', () => {
  const merged = mergeMapPoints([
    { id: 'a', lng: 110.3, lat: 28.4 },
    { id: 'b', lng: 110.301, lat: 28.402 }
  ], projectPoint, 48)

  assert.equal(merged[0].position.lng, 110.3005)
  assert.equal(merged[0].position.lat, 28.401)
})

test('mergeMapPoints ignores invalid coordinates', () => {
  const merged = mergeMapPoints([
    { id: 'valid', lng: 110.3, lat: 28.4 },
    { id: 'bad-lng', lng: Number.NaN, lat: 28.4 },
    { id: 'bad-lat', lng: 110.3, lat: Number.NaN }
  ], projectPoint, 48)

  assert.equal(merged.length, 1)
  assert.equal(merged[0].type, 'point')
  assert.equal(merged[0].point.id, 'valid')
})