// src/generators/rclone-conf.ts
// Pure function: converts WizardState into a valid rclone.conf INI string.
// SECURITY: No logging — state contains credentials. Do NOT add console.log here.

import type { WizardState } from '../store/types';

// Maps our BackendType to rclone's internal type string.
// IMPORTANT: s3-compatible uses 'type = s3' — rclone does not recognize 's3-compatible' as a type.
// S3-compatible backends are differentiated by provider = Other in params.
const RCLONE_TYPE_MAP: Record<string, string> = {
  azureblob: 'azureblob',
  s3: 's3',
  's3-compatible': 's3',
};

export function buildRcloneConf(state: WizardState): string {
  const { name, backendType, params } = state.remote;
  if (!backendType) throw new Error('buildRcloneConf: backendType is required');
  if (!name) throw new Error('buildRcloneConf: remote name is required');

  const rcloneType = RCLONE_TYPE_MAP[backendType];
  const lines: string[] = [`[${name}]`, `type = ${rcloneType}`];

  for (const [key, value] of Object.entries(params)) {
    if (value !== '') {
      lines.push(`${key} = ${value}`);
    }
  }

  return lines.join('\n') + '\n';
}