#!/usr/bin/env node
/**
 * cli:scaffold-api-client — Generate TypeScript API clients + React Query hooks
 */
import { parseArgs } from 'node:util'
import { mkdirSync, writeFileSync } from 'node:fs'
import { dirname, resolve } from 'node:path'
import { validate } from './validate.js'
import { generate, legacyPaths } from './generate.js'
import { generateEnvelope, failGenerate, printEnvelope } from '../../../../../lib/output.js'
import { readSpecArg } from '../../../../../lib/spec-arg.js'
import { assertWebProjectRoot, safeJoinPath } from '../../../../../lib/fs.js'
import { guardedRm } from '../../../../../lib/guarded-rm.js'

const COMMAND = 'scaffold-api-client'

function main(): void {
  const { values } = parseArgs({ options: { spec: { type: 'string' }, 'spec-file': { type: 'string' }, outdir: { type: 'string' }, dry_run: { type: 'boolean', default: false } }, strict: true })
  const specSrc = readSpecArg(values)
  if ('error' in specSrc) { printEnvelope(failGenerate(COMMAND, [specSrc.error])); process.exit(1) }
  let raw: unknown
  try { raw = JSON.parse(specSrc.raw) } catch { printEnvelope(failGenerate(COMMAND, ['Invalid JSON'])); process.exit(1) }
  const validation = validate(raw)
  if (!validation.valid) { printEnvelope(failGenerate(COMMAND, validation.errors)); process.exit(1) }
  const spec = raw as any
  const files = generate(spec)
  const outdir = values.outdir ?? spec.projectPath
  // Idempotent relocate: pre-classification feature files (no <app> segment)
  // are swept so re-running MOVES the client into src/features/<app>/…. The
  // sweep is guarded (lib/guarded-rm): a legacy path identical to an emitted
  // path is never listed, an @customised file is preserved with a warning, and
  // every deletion is traced in the envelope.
  const emittedPaths = new Set(files.map((f: { path: string }) => f.path))
  const legacySweep = legacyPaths(spec).filter((lp: string) => !emittedPaths.has(lp))
  if (values.dry_run) {
    let wouldRemoveLegacy: string[] = []
    try {
      wouldRemoveLegacy = guardedRm(legacySweep, { outdir, dryRun: true }).removed
    } catch { /* outdir invalid — the real run fails on assertWebProjectRoot */ }
    printEnvelope(generateEnvelope(COMMAND, { data: { dryRun: true, files: files.map((f: { path: string }) => f.path), wouldRemoveLegacy } }))
    process.exit(0)
  }
  try {
    assertWebProjectRoot(outdir)
  } catch (e) {
    printEnvelope(failGenerate(COMMAND, [e instanceof Error ? e.message : String(e)])); process.exit(1)
  }
  const sweep = guardedRm(legacySweep, { outdir })
  const written: string[] = []
  for (const file of files) { const p = resolve(safeJoinPath(outdir, file.path)); mkdirSync(dirname(p), { recursive: true }); writeFileSync(p, file.content, 'utf-8'); written.push(p) }
  printEnvelope(generateEnvelope(COMMAND, {
    data: { module: spec.module, fileCount: written.length, filesRemoved: sweep.removed },
    filesCreated: written,
    warnings: sweep.preserved.map((p) => `legacy path ${p} kept: marked @customised — delete manually if truly superseded.`),
    nextSteps: ['Run npm run build to verify'],
  }))
}
main()