/**
 * Runtime Resolver — 从配置推断运行时参数
 *
 * 输入：agent 定义 + client 定义（camelCase，来自 _rowToClientConfig）
 * 输出：protocol, transport, launcherType, launcherConfig
 *
 * 纯函数，无状态，无 DB 依赖。
 *
 * 推断规则：
 *   protocol  = client.acpProtocol   (claude → claude-stream, 其余 → acp)
 *   transport = deploy === 'local' ? 'pipe' : 'websocket'
 *   launcher  = { local: 'process', remote: 'none' }[deploy]
 */

/**
 * 推断运行时参数
 *
 * @param {object} agent  - { type, client, deploy, ... }
 * @param {object} client - { name, command, acpArgs, acpProtocol, ... }
 * @returns {{
 *   protocol: string,
 *   transport: string,
 *   launcherType: string,
 *   command: string,
 *   args: string[],
 *   launcherConfig: object
 * }}
 */
function resolve(agent, client) {
  if (!client) {
    throw new Error(`[RuntimeResolver] agent "${agent.name}" 没有关联 client`);
  }

  const deploy = agent.deploy || 'local';

  // ── 推断 protocol ──
  // 优先使用 agent 配置中的 protocol（per-agent 可覆盖），再用 client 级别默认
  const protocol = agent.protocol || client.acpProtocol || 'acp';

  // ── 推断 transport ──
  const transport = deploy === 'local' ? 'pipe' : 'websocket';

  // ── 推断 launcher type ──
  const launcherTypeMap = { local: 'process', remote: 'none' };
  const launcherType = launcherTypeMap[deploy];
  if (!launcherType) {
    throw new Error(`[RuntimeResolver] 未知 deploy 类型: ${deploy}`);
  }

  // ── 构建 launcher config（给 factory.js 用）──
  const launcherConfig = buildLauncherConfig(client, deploy);

  return {
    protocol,
    transport,
    launcherType,
    command: client.command,
    args: client.acpArgs || [],
    launcherConfig,
  };
}

/**
 * 构建 launcher config（兼容 factory.js 的 createConnection 参数格式）
 */
function buildLauncherConfig(client, deploy) {
  switch (deploy) {
    case 'local':
      return {
        type: 'process',
        command: client.command,
        args: client.acpArgs || [],
      };

    case 'remote':
      return {
        type: 'none',
        url: client.remoteUrl,
      };

    default:
      throw new Error(`[RuntimeResolver] 未知 deploy: ${deploy}`);
  }
}

module.exports = { resolve, buildLauncherConfig };