#!/usr/bin/env node
/**
 * cli:scaffold-ui-primitives — Scaffold theme-compliant UI primitives.
 *
 * Idempotent: skips writes if existing file content matches; honors
 * `/* @customised *\/` (or `// @customised`) marker at the top of the file.
 * For JSON locale files, deep-merges the `entityLookup.*` namespace into
 * existing content so siblings (auth.*, nav.*, …) are preserved.
 */
import { parseArgsOrFail as parseArgs } from '../../../../../lib/cli-args.js';
import { validate } from './validate.js';
import { generate } from './generate.js';
import { generateEnvelope, failGenerate, printEnvelope } from '../../../../../lib/output.js';
import { readSpecArg } from '../../../../../lib/spec-arg.js';
import { assertWebProjectRoot } from '../../../../../lib/fs.js';
import { writeFrontendFiles } from '../../../../../lib/frontend-writes.js';

const COMMAND = 'scaffold-ui-primitives';

function main(): void {
  const { values } = parseArgs({
    options: {
      spec: { type: 'string' }, 'spec-file': { 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 in --spec']));
    process.exit(1);
  }

  const validation = validate(raw);
  if (!validation.valid || !validation.spec) {
    printEnvelope(failGenerate(COMMAND, validation.errors));
    process.exit(1);
  }

  const spec = validation.spec;
  const files = generate(spec);

  if (values.dry_run) {
    printEnvelope(generateEnvelope(COMMAND, {
      data: { dryRun: true, files: files.map((f) => f.path) },
      warnings: validation.warnings,
    }));
    process.exit(0);
  }

  // Fail-closed guard: refuse to write into a .NET backend / repo root. Frontend
  // scaffolds write to <projectPath>/src/… — a wrong projectPath (the repo root)
  // would land files in the backend's src/ and trigger destructive "cleanup".
  try {
    assertWebProjectRoot(spec.projectPath);
  } catch (e) {
    printEnvelope(failGenerate(COMMAND, [e instanceof Error ? e.message : String(e)]));
    process.exit(1);
  }

  // ONE write loop for every frontend primitive scaffolder (lib/frontend-writes): @customised
  // skipped, identical = no-op unless force, catalogues deep-merged, a malformed one refused.
  const { filesCreated, filesModified, skipped, malformed } = writeFrontendFiles(files, { projectPath: spec.projectPath, force: spec.force });

  const nextSteps: string[] = [];
  if (skipped.length > 0) {
    nextSteps.push(`Skipped ${skipped.length} customised file(s): ${skipped.join(', ')}. Remove the @customised marker to allow overwrites.`);
  }
  if (filesCreated.length === 0 && filesModified.length === 0 && skipped.length === 0) {
    nextSteps.push('UI primitives already up-to-date — no changes needed.');
  }
  if (filesCreated.length > 0) {
    nextSteps.push('scaffold-component now resolves @/components/ui/EntityLookup for FK fields. Re-run audit-dev-frontend to clear DEV-UI-022.');
  }

  printEnvelope(generateEnvelope(COMMAND, {
    success: malformed.length === 0,
    data: { fileCount: filesCreated.length + filesModified.length, skipped: skipped.length, malformed },
    filesCreated,
    filesModified,
    errors: malformed.map((p) => `${p} is not valid JSON — NOT merged, NOT overwritten (its other namespaces would be lost): fix or delete the file, then re-run.`),
    warnings: validation.warnings,
    nextSteps,
  }));
  if (malformed.length > 0) process.exit(1);
}

main();