import fs from 'node:fs'
// Fixture regeneration aid (see scripts/fixtures/README.md). Written during the 2026-11-11 build, kept for reference.
// Writes into fixtures/ unless FIXTURES_OUT names another directory (with a trailing slash).
const FIX = process.env.FIXTURES_OUT ?? new URL('../../fixtures/', import.meta.url).pathname
const SOL = new URL('../../js/solutions/', import.meta.url).href
const HERE = new URL('./', import.meta.url).pathname
const S = SOL
const { update } = await import(S + 'game.js')
const { Action } = await import(S + 'model.js')
const p = (x, y) => ({ x, y })
const base = {
  width: 10, height: 10, snake: [p(5, 5), p(4, 5), p(3, 5)], dir: 'Right', nextDir: 'Right',
  apple: p(0, 0), seed: 1, score: 0, status: 'Playing', frame: 0, queued: null,
}
const pending = { ...base, nextDir: 'Up' }
const queuedLeft = { ...pending, queued: 'Left' }
const atTop = { ...queuedLeft, snake: [p(5, 0), p(4, 0), p(3, 0)] }
const cases = [
  ['turn-with-no-turn-pending-sets-next-dir', base, Action.Turn('Up')],
  ['turn-straight-back-with-no-turn-pending-is-ignored', base, Action.Turn('Left')],
  ['perpendicular-key-while-a-turn-is-pending-is-queued', pending, Action.Turn('Left')],
  ['key-in-the-current-direction-while-a-turn-is-pending-is-queued', pending, Action.Turn('Right')],
  ['a-later-key-replaces-the-queued-one', queuedLeft, Action.Turn('Right')],
  ['repeating-the-pending-turn-changes-nothing', queuedLeft, Action.Turn('Up')],
  ['reversing-the-pending-turn-changes-nothing', queuedLeft, Action.Turn('Down')],
  ['turn-while-paused-with-a-turn-pending-is-not-queued', { ...pending, status: 'Paused' }, Action.Turn('Left')],
  ['tick-moves-then-takes-the-queued-turn', queuedLeft, Action.Tick],
  ['tick-with-nothing-queued-leaves-next-dir', pending, Action.Tick],
  ['frame-step-takes-the-queued-turn', { ...queuedLeft, frame: 7 }, Action.Frame],
  ['frame-without-a-step-keeps-the-queue', { ...queuedLeft, frame: 3 }, Action.Frame],
  ['tick-that-ends-the-game-keeps-the-queue', atTop, Action.Tick],
  ['tick-while-paused-keeps-the-queue', { ...queuedLeft, status: 'Paused' }, Action.Tick],
  ['toggle-pause-keeps-the-queue', queuedLeft, Action.TogglePause],
  ['restart-clears-the-queue', queuedLeft, Action.Restart],
].map(([name, s, a]) => ({ name, args: [s, a], expected: update(s, a) }))
const f = FIX + 'm10-update.json'
const fx = JSON.parse(fs.readFileSync(f, 'utf8'))
const names = new Set(cases.map((c) => c.name))
const out = { ...fx, cases: [...fx.cases.filter((c) => !names.has(c.name)), ...cases] }
fs.writeFileSync(f, JSON.stringify(out, null, 2) + '\n')
for (const c of cases) { const [s] = c.args; const e = c.expected; console.log(c.name.padEnd(66), `${s.status} d=${s.dir} n=${s.nextDir} q=${s.queued} head=${JSON.stringify(s.snake[0])} f=${s.frame} -> ${e.status} d=${e.dir} n=${e.nextDir} q=${e.queued} head=${JSON.stringify(e.snake[0])} f=${e.frame} apple=${JSON.stringify(e.apple)} seed=${e.seed}`) }