import {z} from 'zod'

export type GetApiMcpHubOptions = {baseUrl?: string | undefined, OAuth2?: string | undefined, fetch?: typeof fetch | undefined};

export const entrypoint = z.object({args: z.array(z.record(z.string(), z.unknown())).optional(), command: z.string().optional(), env: z.record(z.string(), z.string()).optional(), superGatewayArgs: z.array(z.record(z.string(), z.unknown())).optional()});

export const oAuth = z.object({scope: z.array(z.record(z.string(), z.unknown())).optional(), type: z.string().optional()});

export const form = z.object({config: z.record(z.string(), z.unknown()).optional(), oauth: oAuth.optional(), secrets: z.record(z.string(), z.unknown()).optional()});

export const mCPDefinition = z.object({createdAt: z.string().optional(), updatedAt: z.string().optional(), categories: z.array(z.record(z.string(), z.unknown())).optional(), coming_soon: z.boolean().optional(), description: z.string().optional(), displayName: z.string().optional(), enterprise: z.boolean().optional(), entrypoint: entrypoint.optional(), form: form.optional(), hidden: z.boolean().optional(), hiddenSecrets: z.array(z.string()).optional(), icon: z.string().optional(), image: z.string().optional(), integration: z.string().optional(), longDescription: z.string().optional(), name: z.string().optional(), transport: z.string().optional(), url: z.string().optional()});

export const getApiMcpHubResponse = z.array(mCPDefinition);

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
};

/**
 * List MCP Hub servers
 * 
 * GET /mcp/hub
 * 
 * Also accepts auth: ApiKeyAuth
 */
export const getApiMcpHub = async (options?: GetApiMcpHubOptions) => {
const {baseUrl = "https://api.blaxel.ai/v0", fetch: fetchFn = fetch, OAuth2} = options ?? {}

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

if (OAuth2 !== undefined) headers.set('authorization', `Bearer ${OAuth2}`)

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