import { rename } from 'node:fs/promises';
import path from 'node:path';

import { frontendConfigSchema, type FrontendConfigInput } from './schema.js';
import { ensureDir, readFile, writeFile } from '../utils/fs.js';

export interface WriteManifestOptions {
  readonly outputPath: string;
  readonly data: FrontendConfigInput;
}

export async function writeConfigManifest(options: WriteManifestOptions): Promise<void> {
  const parsed = frontendConfigSchema.parse(options.data);
  const directory = path.dirname(options.outputPath);
  await ensureDir(directory);
  const serialized = JSON.stringify(parsed, undefined, 2);
  const tempPath = path.join(directory, `.webstir-frontend-${process.pid}-${Date.now()}.tmp`);
  await writeFile(tempPath, serialized);
  await rename(tempPath, options.outputPath);
}

export async function readConfigManifest(manifestPath: string): Promise<FrontendConfigInput> {
  const json = await readFile(manifestPath);
  const parsed = JSON.parse(json) as unknown;
  return frontendConfigSchema.parse(parsed);
}