/**
 * @license
 * Copyright 2025 Qwen Team
 * SPDX-License-Identifier: Apache-2.0
 */

import { AuthType } from '@qwen-code/qwen-code-core';
import { z } from 'zod';

/**
 * ACP model IDs are represented as `${modelId}(${authType})` in the ACP protocol.
 */
export function formatAcpModelId(modelId: string, authType: AuthType): string {
  return `${modelId}(${authType})`;
}

/**
 * Extracts the base model id from an ACP model id string.
 *
 * If the string ends with `(...)`, the suffix is removed; otherwise returns the
 * trimmed input as-is.
 */
export function parseAcpBaseModelId(value: string): string {
  const trimmed = value.trim();
  const closeIdx = trimmed.lastIndexOf(')');
  const openIdx = trimmed.lastIndexOf('(');
  if (openIdx >= 0 && closeIdx === trimmed.length - 1 && openIdx < closeIdx) {
    return trimmed.slice(0, openIdx);
  }
  return trimmed;
}

/**
 * Parses an ACP model option string into `{ modelId, authType? }`.
 *
 * Supports the following formats:
 * - `${modelId}(${authType})` - Standard registry model (e.g., "gpt-4(USE_OPENAI)")
 * - `${snapshotId}(${authType})` - Runtime model snapshot (e.g., "$runtime|USE_OPENAI|gpt-4(USE_OPENAI)")
 *   where snapshotId is in format `$runtime|${authType}|${modelId}`
 * - Plain model ID - Returns as-is with no authType
 *
 * If the string ends with `(...)` and `...` is a valid `AuthType`, returns both;
 * otherwise returns the trimmed input as `modelId` only.
 */
export function parseAcpModelOption(input: string): {
  modelId: string;
  authType?: AuthType;
} {
  const trimmed = input.trim();
  const closeIdx = trimmed.lastIndexOf(')');
  const openIdx = trimmed.lastIndexOf('(');
  if (openIdx >= 0 && closeIdx === trimmed.length - 1 && openIdx < closeIdx) {
    const maybeModelId = trimmed.slice(0, openIdx);
    const maybeAuthType = trimmed.slice(openIdx + 1, closeIdx);
    const parsedAuthType = z.nativeEnum(AuthType).safeParse(maybeAuthType);
    if (parsedAuthType.success) {
      return { modelId: maybeModelId, authType: parsedAuthType.data };
    }
  }
  return { modelId: trimmed };
}