import {z} from 'zod'

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

export const platformCapability = z.object({name: z.string().optional(), since: z.string().optional(), description: z.string().optional()});

export const sDKCompatInfo = z.object({min_sdk_version: z.record(z.string(), z.string()).optional(), recommended_sdk_version: z.record(z.string(), z.string()).optional()});

export const pluginCompatInfo = z.object({min_plugin_version: z.record(z.string(), z.string()).optional(), recommended_plugin_version: z.record(z.string(), z.string()).optional()});

export const healthResponse = z.object({status: z.enum(["healthy", "starting", "unhealthy"]).optional(), service: z.string().optional(), version: z.string().optional(), timestamp: z.string().optional(), capabilities: z.array(platformCapability).optional(), sdk_compatibility: sDKCompatInfo.optional(), plugin_compatibility: pluginCompatInfo.optional(), components: z.object({policy_engine: z.boolean().optional(), llm_router: z.boolean().optional(), response_processor: z.boolean().optional(), audit_logger: z.boolean().optional(), workflow_engine: z.boolean().optional(), planning_engine: z.boolean().optional(), result_aggregator: z.boolean().optional()}).optional(), features: z.object({multi_agent_planning: z.boolean().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
};

/**
 * Health check
 * 
 * GET /health
 */
export const getApiHealth = async (options?: GetApiHealthOptions) => {
const {baseUrl = "https://orchestrator.getaxonflow.com", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/health${query.size > 0 ? `?${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(healthResponse, await res.json())
};