geointel/frontend/src/hooks/useMapRectangleSelection.test.tsx

import { act, renderHook } from '@testing-library/react'
import { describe, expect, it } from 'vitest'

import { useMapRectangleSelection } from './useMapRectangleSelection'
import type { VectorSelectionBBox } from '../types'

/**
 * Corner tracking lived inline in a 3.300-line component and was never
 * exercised. The rule worth pinning is that a first corner produces no
 * rectangle at all: acting on it would analyse a zero-width area.
 */

const BBOX: VectorSelectionBBox = { min_x: 5.0, min_y: 51.1, max_x: 5.2, max_y: 51.3, crs: 'EPSG:4326' }

function setup(initial: VectorSelectionBBox | null = null) {
  return renderHook(() => useMapRectangleSelection(initial))
}

describe('two-click rectangle', () => {
  it('yields no rectangle from the first corner', () => {
    const view = setup()

    let result: VectorSelectionBBox | null = BBOX
    act(() => {
      result = view.result.current.placeCorner([5.0, 51.1])
    })

    expect(result).toBeNull()
    expect(view.result.current.firstCorner).toEqual([5.0, 51.1])
  })

  it('yields the normalised rectangle from the second corner', () => {
    const view = setup()

    act(() => void view.result.current.placeCorner([5.2, 51.3]))
    let result: VectorSelectionBBox | null = null
    act(() => {
      result = view.result.current.placeCorner([5.0, 51.1])
    })

    expect(result).not.toBeNull()
    expect(result!.min_x).toBeCloseTo(5.0)
    expect(result!.min_y).toBeCloseTo(51.1)
    expect(result!.max_x).toBeCloseTo(5.2)
    expect(result!.max_y).toBeCloseTo(51.3)
  })

  it('leaves no half-finished gesture behind', () => {
    const view = setup()

    act(() => void view.result.current.setDrawing(true))
    act(() => void view.result.current.placeCorner([5.2, 51.3]))
    act(() => void view.result.current.placeCorner([5.0, 51.1]))

    expect(view.result.current.firstCorner).toBeNull()
    expect(view.result.current.drawing).toBe(false)
  })

  it('normalises corners placed in any order', () => {
    const view = setup()

    act(() => void view.result.current.placeCorner([5.0, 51.3]))
    let result: VectorSelectionBBox | null = null
    act(() => {
      result = view.result.current.placeCorner([5.2, 51.1])
    })

    expect(result!.min_x).toBeLessThan(result!.max_x)
    expect(result!.min_y).toBeLessThan(result!.max_y)
  })
})

describe('coordinate fields', () => {
  it('starts from the rectangle already on the map', () => {
    const view = setup(BBOX)

    expect(view.result.current.typedBbox).toMatchObject({ min_x: 5.0, max_y: 51.3 })
  })

  it('parses a complete rectangle', () => {
    const view = setup()

    act(() =>
      view.result.current.setBboxInput({ min_x: '5.0', min_y: '51.1', max_x: '5.2', max_y: '51.3' }),
    )

    expect(view.result.current.typedBbox).toMatchObject({ min_x: 5.0, max_y: 51.3 })
  })

  it('reports no rectangle while the fields are incomplete', () => {
    const view = setup()

    act(() => view.result.current.setBboxInput({ min_x: '5.0', min_y: '', max_x: '', max_y: '' }))

    expect(view.result.current.typedBbox).toBeNull()
  })

  it('supports an updater so one field can change at a time', () => {
    const view = setup(BBOX)

    act(() => view.result.current.setBboxInput((previous) => ({ ...previous, max_x: '5.4' })))

    expect(view.result.current.typedBbox).toMatchObject({ min_x: 5.0, max_x: 5.4 })
  })

  it('shows a rectangle that was set elsewhere', () => {
    const view = setup()

    act(() => view.result.current.showBbox(BBOX))

    expect(view.result.current.typedBbox).toMatchObject({ min_x: 5.0, max_y: 51.3 })
  })

  it('clears the fields when the selection is cleared', () => {
    const view = setup(BBOX)

    act(() => view.result.current.showBbox(null))

    expect(view.result.current.typedBbox).toBeNull()
  })
})

describe('reset', () => {
  it('abandons a half-drawn rectangle', () => {
    const view = setup()

    act(() => void view.result.current.placeCorner([5.0, 51.1]))
    act(() => view.result.current.reset())

    expect(view.result.current.firstCorner).toBeNull()
    expect(view.result.current.drawing).toBe(false)
  })
})