import {z} from 'zod'

export type GetApiLinksArgs = {limit?: number | undefined, offset?: number | undefined, filter?: string | undefined};

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

export const pagination = z.object({limit: z.number(), offset: z.number(), totalCount: z.number()});

export const meta = z.object({filterableFields: z.array(z.string()).optional(), pagination: pagination.optional(), apiEnrollmentVersion: z.string().optional(), apiVersion: z.string().optional()});

export const link = z.object({href: z.string(), method: z.string().optional(), comment: z.string().optional()});

export const links = z.record(z.string(), link);

export const entityRef = z.object({entity: z.string().optional(), id: z.string().optional(), name: z.string().optional(), _links: links.optional()});

export const linkConnection = z.object({type: z.string().optional(), source: z.string().optional(), dest: z.string().optional()});

export const linkDetail = z.object({id: z.string(), protocol: z.string(), sourceRouter: entityRef, destRouter: entityRef, state: z.string(), down: z.boolean(), staticCost: z.number().int(), sourceLatency: z.number().int(), destLatency: z.number().int(), cost: z.number().int(), iteration: z.number().int(), connections: z.array(linkConnection).optional()});

export const linkList = z.array(linkDetail);

export const listLinksEnvelope = z.object({meta: meta, data: linkList});

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 links
 * 
 * GET /links
 * 
 * Also accepts auth: oauth2
 */
export const getApiLinks = async (args: GetApiLinksArgs, options?: GetApiLinksOptions) => {
const {baseUrl = "https://demo.ziti.dev/fabric/v1", fetch: fetchFn = fetch, ztSession} = options ?? {}

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

if (args.limit != null) query.append("limit", String(args.limit))
if (args.offset != null) query.append("offset", String(args.offset))
if (args.filter != null) query.append("filter", String(args.filter))
if (ztSession !== undefined) headers.set("zt-session", ztSession)

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