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

import {
  mapSizeChanged,
  shouldApplyInitialViewport,
  viewportMatchesBounds
} from "./map_viewport_sync.mjs"

const bounds = ({west, south, east, north}) => ({
  getWest: () => west,
  getSouth: () => south,
  getEast: () => east,
  getNorth: () => north
})

test("a server acknowledgement rounded to six decimals does not move the map again", () => {
  const viewport = {
    west: 30.543427,
    south: 50.42413,
    east: 30.551643,
    north: 50.429139
  }

  assert.equal(
    viewportMatchesBounds(
      viewport,
      bounds({
        west: 30.543426946507708,
        south: 50.42413000000005,
        east: 30.55164305349291,
        north: 50.42913900000016
      })
    ),
    true
  )
})

test("a materially different saved viewport still repositions the map", () => {
  const viewport = {west: 30.5, south: 50.4, east: 30.6, north: 50.5}

  assert.equal(
    viewportMatchesBounds(
      viewport,
      bounds({west: 30.51, south: 50.41, east: 30.61, north: 50.51})
    ),
    false
  )
})

test("map resize is requested only when the rendered dimensions change", () => {
  assert.equal(mapSizeChanged(null, {width: 767, height: 734}), true)
  assert.equal(
    mapSizeChanged({width: 767, height: 734}, {width: 767, height: 734}),
    false
  )
  assert.equal(
    mapSizeChanged({width: 767, height: 734}, {width: 768, height: 734}),
    true
  )
})

test("server viewport is never reapplied after the user camera is initialized", () => {
  assert.equal(shouldApplyInitialViewport(false), true)
  assert.equal(shouldApplyInitialViewport(true), false)
})