// 统一的 API 端点常量，消除硬编码字符串
export const API = {
  config: '/api/config',
  restart: '/api/restart',
  health: '/health',
  mcpStatus: '/api/mcp/status',
  skills: '/api/skills',
  skillsToggle: '/api/skills/toggle',
  subagents: '/api/subagents',
  subagentsToggle: '/api/subagents/toggle',
  experts: '/api/experts',
  expertsToggle: '/api/experts/toggle',
  expertsCreate: '/api/experts/create',
  expertsUpdate: '/api/experts/update',
  expertsDelete: '/api/experts/delete',
  expertsSelected: '/api/experts/selected',
  expertsSelect: '/api/experts/select',
} as const

/**
 * 基础 fetch 封装：自动添加 JSON headers，解析响应。
 * 返回 [data, error] 元组，不抛异常。
 */
export async function apiFetch<T>(
  endpoint: string,
  options?: { method?: string; body?: unknown; signal?: AbortSignal }
): Promise<[T | null, { status: number; message: string } | null]> {
  try {
    const resp = await fetch(endpoint, {
      method: options?.method ?? 'GET',
      headers: options?.body ? { 'Content-Type': 'application/json' } : undefined,
      body: options?.body ? JSON.stringify(options.body) : undefined,
      signal: options?.signal,
    })
    const data = await resp.json().catch(() => null)
    if (!resp.ok) {
      return [null, { status: resp.status, message: data?.message || data?.error || `HTTP ${resp.status}` }]
    }
    return [data as T, null]
  } catch (e) {
    return [null, { status: 0, message: e instanceof Error ? e.message : 'Network error' }]
  }
}

/**
 * GET 请求，静默失败返回 null（用于列表加载等场景）。
 */
export async function apiGetSilent<T>(endpoint: string): Promise<T | null> {
  try {
    const resp = await fetch(endpoint)
    if (!resp.ok) return null
    return await resp.json() as T
  } catch {
    return null
  }
}