// 分割树切片顺序枚举实证: node scripts/analyze-split-order.mjs
// 候选规则: A=遍历序c1→c2(现实现) B=遍历序c2→c1 C=min侧先(竖左/横上) D=max侧先
// 评分: 扇 polyId.idx 与玻璃 fls pid.idx 落在最终区域数内的比例 + 704/31594 样本特检
import fs from 'fs'
import path from 'path'

const DIR = 'D:/Code/huamenchuang/data/windoor-drawings'

const bboxOf = pts => ({
  x0: Math.min(...pts.map(p => p.x)), y0: Math.min(...pts.map(p => p.y)),
  x1: Math.max(...pts.map(p => p.x)), y1: Math.max(...pts.map(p => p.y)),
})
const spAxis = sp => {
  const n = sp.line?.norm ?? { x: 1, y: 0 }
  return Math.abs(n.x) >= Math.abs(n.y) ? 'v' : 'h'
}
const spPos = sp => (spAxis(sp) === 'v' ? sp.line.pt.x : sp.line.pt.y)

function splitPoly(region, axis, pos, rule) {
  const pts = region.map(s => s.ps)
  const n = pts.length
  const get = p => (axis === 'v' ? p.x : p.y)
  const crossings = []
  for (let i = 0; i < n; i++) {
    const a = pts[i], b = pts[(i + 1) % n]
    const da = get(a) - pos, db = get(b) - pos
    if ((da < 0 && db > 0) || (da > 0 && db < 0)) {
      const t = da / (da - db)
      crossings.push({ i, p: axis === 'v' ? { x: pos, y: a.y + (b.y - a.y) * t } : { x: a.x + (b.x - a.x) * t, y: pos } })
    }
  }
  if (crossings.length !== 2) return null
  const [c1, c2] = crossings
  if (c1.i === c2.i) return null
  const collect = (from, to) => {
    const ps = [from.p]
    for (let k = (from.i + 1) % n; ; k = (k + 1) % n) {
      ps.push(pts[k])
      if (k === to.i) break
    }
    ps.push(to.p)
    return ps.filter((p, i) => i === 0 || Math.abs(p.x - ps[i - 1].x) > 0.01 || Math.abs(p.y - ps[i - 1].y) > 0.01)
  }
  const toSegs = ps => ps.map((p, i) => ({ ps: p, pe: ps[(i + 1) % ps.length], name: 'segment' }))
  let A = collect(c1, c2), B = collect(c2, c1)
  if (A.length < 3 || B.length < 3) return null
  const pa = toSegs(A), pb = toSegs(B)
  if (rule === 'A') return [pa, pb]
  if (rule === 'B') return [pb, pa]
  const ba = bboxOf(A), bb = bboxOf(B)
  const minFirst = axis === 'v' ? ba.x0 <= bb.x0 : ba.y0 <= bb.y0
  return minFirst ? (rule === 'C' ? [pa, pb] : [pb, pa]) : (rule === 'C' ? [pb, pa] : [pa, pb])
}

function replay(shape, rule, trace) {
  const base = (shape.polygon?.polygon ?? [])
    .map(r => r.filter(s => s?.ps && s?.pe && [s.ps.x, s.ps.y, s.pe.x, s.pe.y].every(Number.isFinite))
      .map(s => ({ ps: { ...s.ps }, pe: { ...s.pe } })))
    .filter(r => r.length >= 3)
  const regions = base.map(r => r)
  for (const sp of (shape.mm?.sp ?? [])) {
    if (!sp?.line?.pt || !sp.line.norm) continue
    const axis = spAxis(sp), pos = spPos(sp)
    let idx = sp.polyId?.idx ?? -1
    const rawIdx = idx
    if (!Number.isInteger(idx) || idx < 0 || idx >= regions.length) idx = 0
    const target = regions[idx]
    if (!target || target.length < 3) continue
    const bb = bboxOf(target.map(s => s.ps))
    const lo = axis === 'v' ? bb.x0 : bb.y0, hi = axis === 'v' ? bb.x1 : bb.y1
    const inside = pos > lo + 0.5 && pos < hi - 0.5
    const pieces = inside ? splitPoly(target, axis, pos, rule) : null
    if (trace) {
      console.log(`  sp axis=${axis} pos=${pos.toFixed(1)} polyId=${JSON.stringify(sp.polyId)} rawIdx=${rawIdx}->${idx}`
        + ` 目标bbox=${JSON.stringify(bb)} ${inside ? '内部✓' : '退化✗'} ${pieces ? '切分✓' : '切分✗'}`)
    }
    if (!pieces) continue
    regions.splice(idx, 1, pieces[0], pieces[1])
  }
  return regions
}

const files = fs.readdirSync(DIR).filter(f => f.endsWith('.json'))
const shapes = []
for (const f of files) {
  const row = JSON.parse(fs.readFileSync(path.join(DIR, f), 'utf8'))
  const dd = typeof row.drawing_data === 'string' ? JSON.parse(row.drawing_data) : row.drawing_data
  dd.sm?.forEach(shape => shapes.push({ f, shape }))
}

for (const rule of ['A', 'B', 'C', 'D']) {
  let sashOk = 0, sashN = 0, glassOk = 0, glassN = 0
  for (const { f, shape } of shapes) {
    const regions = replay(shape, rule)
    for (const sub of (shape.sm ?? [])) {
      const idx = sub.polyId?.idx
      if (idx == null || idx < 0 || sub.enabled === false) continue
      sashN++
      if (idx < regions.length) sashOk++
    }
    for (const fl of (shape.mm?.fls?.fls ?? [])) {
      const idx = fl.pid?.idx
      if (idx == null || idx < 0) continue
      glassN++
      if (idx < regions.length) glassOk++
    }
    if (f === '704.json') {
      const r = regions[sub704Idx(shape)]
      console.log(`  [${rule}] 704 扇挂接区域:`, r ? JSON.stringify(bboxOf(r.map(s => s.ps))) : '越界')
    }
    if (f === '31594.json') {
      console.log(`  [${rule}] 31594 区域数:`, regions.length, '(应为 7)')
      if (process.argv[2] === 'trace') {
        console.log(`  [${rule}] 31594 逐条重放:`)
        replay(shape, rule, true)
      }
    }
  }
  console.log(`规则${rule}: 扇引用有效 ${sashOk}/${sashN} (${(100 * sashOk / sashN).toFixed(1)}%) | 玻璃引用有效 ${glassOk}/${glassN} (${(100 * glassOk / glassN).toFixed(1)}%)`)
}

function sub704Idx(shape) {
  const sub = (shape.sm ?? []).find(s => s.enabled !== false)
  return sub?.polyId?.idx ?? -1
}