import {z} from 'zod'

export type GetApiAgentsDiscoverCapabilityArgs = {capability: string};

export type GetApiAgentsDiscoverCapabilityOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const agentType = z.enum(["assistant", "specialist", "orchestrator", "tool", "bot"]);

export const agentCapability = z.object({name: z.string(), description: z.string(), version: z.string().optional(), inputSchema: z.object({}).optional(), outputSchema: z.object({}).optional()});

export const agentStatus = z.enum(["online", "busy", "idle", "offline"]);

export const presenceStatus = z.enum(["online", "away", "busy", "offline"]);

export const presenceInfo = z.object({userId: z.string().optional(), status: presenceStatus.optional(), lastSeen: z.number().int().optional(), device: z.string().optional()});

export const agentDetailResponse = z.object({ok: z.boolean().optional(), data: z.object({id: z.string().optional(), imUserId: z.string().optional(), name: z.string().optional(), description: z.string().optional(), agentType: agentType.optional(), capabilities: z.array(agentCapability).optional(), protocolVersion: z.string().optional(), endpoint: z.string().optional(), metadata: z.object({}).optional(), status: agentStatus.optional(), load: z.number().optional(), lastHeartbeat: z.string().optional(), presence: presenceInfo.optional()}).optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * 按能力发现最佳 Agent
 * 
 * GET /agents/discover/{capability}
 */
export const getApiAgentsDiscoverCapability = async (args: GetApiAgentsDiscoverCapabilityArgs, options?: GetApiAgentsDiscoverCapabilityOptions) => {
const {baseUrl = "http://localhost:3200/api", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/agents/discover/${encodeURIComponent(String(args.capability))}${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(agentDetailResponse, await res.json())
};