import { CLIENT_NAMES } from "./constants.js";
import type { ClientName } from "./types.js";

export interface DispatchConfig {
  defaultClient?: ClientName;
  client?: ClientName;
}

export function resolveClient(
  prompt: string,
  config?: DispatchConfig
): ClientName | null {
  // Explicit --client flag takes highest precedence
  if (config?.client && CLIENT_NAMES.includes(config.client)) {
    return config.client;
  }

  const lower = prompt.toLowerCase();

  // Check for "open code" before "opencode" to handle the spaced variant
  if (lower.includes("open code")) {
    return "opencode";
  }

  if (lower.includes("claude")) {
    return "claude";
  }

  if (lower.includes("codex")) {
    return "codex";
  }

  if (lower.includes("opencode")) {
    return "opencode";
  }

  return config?.defaultClient ?? null;
}