#!/usr/bin/env node
/**
 * Deterministic plan scaffolder for this repo.
 *
 * Creates `.kilo/plans/<epoch-ms>-<slug>.md` from `.kilo/templates/plan.md` so
 * every new plan is kilo-loop compatible by construction (contains `- [ ]`
 * stages). kilo-loop only discovers markdown plans with checkbox stages.
 *
 * Usage:
 *   node tools/kilocode-loop/new-plan.mjs "My plan title"
 *   node tools/kilocode-loop/new-plan.mjs "My plan title" --slug my-plan
 *   node tools/kilocode-loop/new-plan.mjs "My plan title" --print
 *   node tools/kilocode-loop/new-plan.mjs "My plan title" --force
 *
 * Options:
 *   --slug <s>    filename slug (default: slugified title)
 *   --epoch <ms>  timestamp for the filename (default: now); useful for tests
 *   --dir <d>     target directory (default: .kilo/plans)
 *   --project <p> project root (default: git/cwd discovery upward)
 *   --print       print the plan to stdout instead of writing a file
 *   --force       overwrite an existing file
 *   -h, --help    show this help
 */
import fs from 'node:fs'
import path from 'node:path'

const DEFAULT_DIR = path.join('.kilo', 'plans')
const TEMPLATE = path.join('.kilo', 'templates', 'plan.md')
const CHECKBOX_RE = /^\s*[-*]\s+\[[ xX]\]/m

/**
 * Built-in fallback template, used when the project has no
 * `.kilo/templates/plan.md`. Guarantees a kilo-loop-compatible plan everywhere.
 */
const DEFAULT_TEMPLATE = `# {{TITLE}}

> **Status:** draft.

## Stages (kilo-loop)

<!-- One checkbox per deliverable. A plan is discovered only when it contains
     \`- [ ]\` items. Directives: \`:: verify: <cmd>\` and \`:: acceptance: <text>\`.
     Mark \`[x]\` only after the stage is actually verified. -->

- [ ] Stage 1 — <outcome> :: acceptance: <how to confirm>
- [ ] Stage 2 — <outcome> :: acceptance: <how to confirm>

---

## 0. Goal

<!-- What we build and why; scope boundaries. -->

## 1. Current state (verified facts)

<!-- Facts with \`file:line\`, no assumptions. -->

## 2. Decisions

| # | Decision | Choice |
|---|----------|--------|
| D1 | | |

## 3. Data model / contracts

## 4. Backend API

## 5. Frontend

## 6. Verification

<!-- Exact commands/URLs and expected evidence. -->

## 7. Risks

| Risk | Mitigation |
|---|---|
| | |
`

function usage() {
  const txt = fs.readFileSync(new URL(import.meta.url), 'utf8')
  const block = txt.match(/\/\*\*([\s\S]*?)\*\//)
  if (block) console.log(block[1].replace(/^\s*\* ?/gm, '').trim())
}

function fail(msg) {
  console.error(`new-plan: ${msg}`)
  process.exit(1)
}

function slugify(s) {
  return s
    .toLowerCase()
    .normalize('NFKD')
    .replace(/[^\p{L}\p{N}]+/gu, '-')
    .replace(/^-+|-+$/g, '')
    .slice(0, 80) || 'plan'
}

/** Walk up from `start` until a directory containing `.kilo` (or `.git`) is found. */
function findProject(start) {
  let dir = path.resolve(start)
  for (;;) {
    if (fs.existsSync(path.join(dir, '.kilo')) || fs.existsSync(path.join(dir, '.git'))) return dir
    const parent = path.dirname(dir)
    if (parent === dir) return path.resolve(start)
    dir = parent
  }
}

function parseArgs(argv) {
  const out = { title: [], slug: '', dir: DEFAULT_DIR, project: '', print: false, force: false, epoch: 0 }
  for (let i = 0; i < argv.length; i++) {
    const a = argv[i]
    if (a === '--slug') out.slug = argv[++i] ?? ''
    else if (a === '--dir') out.dir = argv[++i] ?? DEFAULT_DIR
    else if (a === '--project') out.project = argv[++i] ?? ''
    else if (a === '--epoch') out.epoch = Number(argv[++i]) || 0
    else if (a === '--print') out.print = true
    else if (a === '--force') out.force = true
    else if (a === '-h' || a === '--help') {
      usage()
      process.exit(0)
    } else out.title.push(a)
  }
  out.title = out.title.join(' ').trim()
  return out
}

const args = parseArgs(process.argv.slice(2))
if (!args.title) {
  usage()
  fail('a plan title is required')
}

const project = args.project ? path.resolve(args.project) : findProject(process.cwd())
const templatePath = path.join(project, TEMPLATE)

let body
if (fs.existsSync(templatePath)) {
  body = fs.readFileSync(templatePath, 'utf8')
} else {
  console.error(`new-plan: no template at ${rel(templatePath)} — using the built-in default`)
  body = DEFAULT_TEMPLATE
}
if (!body.includes('{{TITLE}}')) fail(`template is missing the {{TITLE}} placeholder`)

const slug = slugify(args.slug || args.title)
const epoch = args.epoch || Date.now()
const fileName = `${epoch}-${slug}.md`
const targetDir = path.resolve(project, args.dir)
const targetPath = path.join(targetDir, fileName)

body = body
  .replaceAll('{{TITLE}}', args.title)
  .replaceAll('{{SLUG}}', slug)
  .replaceAll('{{EPOCH}}', String(epoch))
  .replaceAll('{{DATE}}', new Date(epoch).toISOString())

// Defensive: keep plans discoverable even if the template is edited badly.
if (!CHECKBOX_RE.test(body)) {
  body += `\n## Stages (kilo-loop)\n\n- [ ] Complete the plan :: acceptance: goal achieved\n`
  console.error('new-plan: template had no checkbox stages — injected a default Stages section')
}

if (args.print) {
  process.stdout.write(body)
  process.exit(0)
}

fs.mkdirSync(targetDir, { recursive: true })
if (fs.existsSync(targetPath) && !args.force) fail(`already exists: ${rel(targetPath)} (use --force)`)
fs.writeFileSync(targetPath, body)
console.log(rel(targetPath))

function rel(abs) {
  return path.relative(project, abs).split(path.sep).join('/')
}