import fs from 'node:fs/promises';
import path from 'node:path';
import type { ControlPlaneState } from '../../src/shared/contracts';
import { createDefaultState } from './config';

export class StateStore {
  constructor(private readonly statePath: string) {}

  async read(): Promise<ControlPlaneState> {
    await fs.mkdir(path.dirname(this.statePath), { recursive: true });

    try {
      const raw = await fs.readFile(this.statePath, 'utf8');
      return JSON.parse(raw) as ControlPlaneState;
    } catch (error) {
      if ((error as NodeJS.ErrnoException).code !== 'ENOENT') {
        throw error;
      }

      const fallback = createDefaultState();
      await this.write(fallback);
      return fallback;
    }
  }

  async write(state: ControlPlaneState): Promise<void> {
    await fs.mkdir(path.dirname(this.statePath), { recursive: true });
    await fs.writeFile(this.statePath, `${JSON.stringify(state, null, 2)}\n`, 'utf8');
  }
}