import { describe, expect, test } from 'bun:test'
import type { Mesh } from 'three'
import { buildShelfGeometry, shelfRowSurfaceYs } from '../geometry'
import { ShelfNode } from '../schema'

describe('buildShelfGeometry — wall-shelf', () => {
  test('returns a Group with one board + two brackets (default v1 shape)', () => {
    const node = ShelfNode.parse({})
    const group = buildShelfGeometry(node)
    const names = group.children.map((c) => c.name)
    expect(names).toContain('shelf-board-0')
    expect(names).toContain('shelf-bracket-left')
    expect(names).toContain('shelf-bracket-right')
    expect(group.children.length).toBe(3)
  })

  test('hidden bracket style omits both brackets', () => {
    const node = ShelfNode.parse({ bracketStyle: 'hidden' })
    const group = buildShelfGeometry(node)
    expect(group.children.length).toBe(1)
    expect(group.children[0]!.name).toBe('shelf-board-0')
  })

  test('top board y-center matches height + thickness/2 (v1 semantic preserved)', () => {
    const node = ShelfNode.parse({ height: 1.0, thickness: 0.05 })
    const group = buildShelfGeometry(node)
    const top = group.children.find((c) => c.name === 'shelf-board-0') as Mesh | undefined
    expect(top).toBeDefined()
    expect(top!.position.y).toBeCloseTo(1.0 + 0.025)
  })

  test('rows > 1 produces multiple boards evenly spaced from height/rows to height', () => {
    const node = ShelfNode.parse({ rows: 3, height: 1.8, thickness: 0.04 })
    const group = buildShelfGeometry(node)
    const boards = group.children.filter((c) => c.name.startsWith('shelf-board-')) as Mesh[]
    expect(boards.length).toBe(3)
    const ys = boards.map((b) => b.position.y).sort((a, b) => a - b)
    expect(ys[0]).toBeCloseTo(0.6 + 0.02)
    expect(ys[1]).toBeCloseTo(1.2 + 0.02)
    expect(ys[2]).toBeCloseTo(1.8 + 0.02)
  })

  test('industrial bracket style produces wider bracket boxes', () => {
    const minimal = buildShelfGeometry(ShelfNode.parse({ bracketStyle: 'minimal', depth: 0.4 }))
    const industrial = buildShelfGeometry(
      ShelfNode.parse({ bracketStyle: 'industrial', depth: 0.4 }),
    )
    const minimalBracket = minimal.children.find((c) => c.name === 'shelf-bracket-left') as Mesh
    const industrialBracket = industrial.children.find(
      (c) => c.name === 'shelf-bracket-left',
    ) as Mesh
    const minimalParams = (minimalBracket.geometry as any).parameters
    const industrialParams = (industrialBracket.geometry as any).parameters
    expect(industrialParams.width).toBeGreaterThan(minimalParams.width)
  })
})

describe('buildShelfGeometry — bookshelf', () => {
  test('emits side panels + multiple boards', () => {
    const node = ShelfNode.parse({ style: 'bookshelf', rows: 4, height: 1.8 })
    const group = buildShelfGeometry(node)
    const names = group.children.map((c) => c.name)
    expect(names).toContain('shelf-side-left')
    expect(names).toContain('shelf-side-right')
    expect(names.filter((n) => n.startsWith('shelf-board-')).length).toBe(4)
  })

  test('withBack adds a back panel', () => {
    const without = buildShelfGeometry(ShelfNode.parse({ style: 'bookshelf', withBack: false }))
    const withBack = buildShelfGeometry(ShelfNode.parse({ style: 'bookshelf', withBack: true }))
    expect(without.children.find((c) => c.name === 'shelf-back')).toBeUndefined()
    expect(withBack.children.find((c) => c.name === 'shelf-back')).toBeDefined()
  })

  test('columns > 1 adds vertical dividers', () => {
    const node = ShelfNode.parse({ style: 'bookshelf', columns: 3 })
    const group = buildShelfGeometry(node)
    const dividers = group.children.filter((c) => c.name.startsWith('shelf-divider-col-'))
    expect(dividers.length).toBe(2)
  })

  test('withSides=false replaces side panels with corner posts', () => {
    const node = ShelfNode.parse({ style: 'bookshelf', withSides: false })
    const group = buildShelfGeometry(node)
    const names = group.children.map((c) => c.name)
    expect(names).not.toContain('shelf-side-left')
    expect(names.filter((n) => n.startsWith('shelf-post-')).length).toBe(4)
  })
})

describe('buildShelfGeometry — open-rack', () => {
  test('always emits four corner posts', () => {
    const node = ShelfNode.parse({ style: 'open-rack' })
    const group = buildShelfGeometry(node)
    const posts = group.children.filter((c) => c.name.startsWith('shelf-post-'))
    expect(posts.length).toBe(4)
  })

  test('withBack adds horizontal cross-braces top + bottom', () => {
    const node = ShelfNode.parse({ style: 'open-rack', withBack: true })
    const group = buildShelfGeometry(node)
    const braces = group.children.filter((c) => c.name.startsWith('shelf-brace-h-'))
    expect(braces.length).toBe(2)
  })
})

describe('buildShelfGeometry — cubby', () => {
  test('grid of cubbies emits sides + back + boards + dividers', () => {
    const node = ShelfNode.parse({ style: 'cubby', rows: 3, columns: 3 })
    const group = buildShelfGeometry(node)
    const names = group.children.map((c) => c.name)
    expect(names).toContain('shelf-side-left')
    expect(names).toContain('shelf-side-right')
    expect(names).toContain('shelf-back')
    // Boards: rows = 3 → 3 horizontal boards.
    expect(names.filter((n) => n.startsWith('shelf-board-')).length).toBe(3)
    // Dividers: (columns − 1) per row → 2 × 3 = 6.
    expect(names.filter((n) => /^shelf-divider-\d+-\d+$/.test(n)).length).toBe(6)
  })

  test('withBottom adds a floor board at y = thickness/2', () => {
    const node = ShelfNode.parse({ style: 'cubby', withBottom: true, thickness: 0.05 })
    const group = buildShelfGeometry(node)
    const bottom = group.children.find((c) => c.name === 'shelf-board-bottom') as Mesh | undefined
    expect(bottom).toBeDefined()
    expect(bottom!.position.y).toBeCloseTo(0.025)
  })

  test('withBottom=false omits the floor board', () => {
    const node = ShelfNode.parse({ style: 'cubby', withBottom: false })
    const group = buildShelfGeometry(node)
    expect(group.children.find((c) => c.name === 'shelf-board-bottom')).toBeUndefined()
  })
})

describe('shelfRowSurfaceYs — withBottom', () => {
  test('prepends y = thickness when cubby has withBottom on', () => {
    const node = ShelfNode.parse({
      style: 'cubby',
      withBottom: true,
      rows: 3,
      height: 1.8,
      thickness: 0.05,
    })
    const ys = shelfRowSurfaceYs(node)
    expect(ys.length).toBe(4)
    expect(ys[0]).toBeCloseTo(0.05) // top of bottom board
  })

  test('ignores withBottom for wall-shelf', () => {
    const node = ShelfNode.parse({ style: 'wall-shelf', withBottom: true })
    const ys = shelfRowSurfaceYs(node)
    expect(ys.length).toBe(1)
  })
})

describe('shelfRowSurfaceYs', () => {
  test('returns one Y per row, all at board top', () => {
    const node = ShelfNode.parse({ rows: 3, height: 1.8, thickness: 0.04 })
    const ys = shelfRowSurfaceYs(node)
    expect(ys.length).toBe(3)
    // Y values are sorted ascending and represent top-of-board.
    expect(ys[0]).toBeCloseTo(0.6 + 0.04)
    expect(ys[1]).toBeCloseTo(1.2 + 0.04)
    expect(ys[2]).toBeCloseTo(1.8 + 0.04)
  })

  test('rows=1 returns single Y at v1 top-of-board (height + thickness)', () => {
    const node = ShelfNode.parse({ height: 0.9, thickness: 0.04 })
    const ys = shelfRowSurfaceYs(node)
    expect(ys.length).toBe(1)
    expect(ys[0]).toBeCloseTo(0.94)
  })
})

describe('material application', () => {
  test('default shelf material is the canonical white shared with walls / stairs', () => {
    const board = buildShelfGeometry(ShelfNode.parse({})).children.find(
      (c) => c.name === 'shelf-board-0',
    ) as Mesh
    const material = board.material as { color: { getHexString(): string } }
    // DEFAULT_SHELF_MATERIAL is '#ffffff' — same as DEFAULT_WALL_MATERIAL /
    // DEFAULT_STAIR_MATERIAL so an unpainted shelf reads as the same
    // "default white" surface the rest of the structural kinds use.
    expect(material.color.getHexString().toLowerCase()).toBe('ffffff')
  })

  test('user-set material is applied (not the default)', () => {
    const defaultBoard = (
      buildShelfGeometry(ShelfNode.parse({})).children.find(
        (c) => c.name === 'shelf-board-0',
      ) as Mesh
    ).material as { color: { getHexString(): string } }
    const customBoard = (
      buildShelfGeometry(
        ShelfNode.parse({
          material: { properties: { color: '#112233' } },
        }),
      ).children.find((c) => c.name === 'shelf-board-0') as Mesh
    ).material as { color: { getHexString(): string } }
    expect(customBoard.color.getHexString()).not.toBe(defaultBoard.color.getHexString())
  })
})