import {z} from 'zod'

export type GCPAttributes = {'logging.googleapis.com/timestamp': string};

export type GCPMessage = {attributes: GCPAttributes, data: string, messageId: string, message_id: string, publishTime: string, publish_time: string};

export type CreateApiGcpOrgIdStreamNameSubArgs = {org_id: string, stream_name: string, body: {message: GCPMessage, subscription: string}};

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

export const streamStatus = z.object({error: z.string().optional(), failed: z.number().int().gte(0), successful: z.number().int().gte(0), name: z.string()});

export const ingestionResponse = z.object({code: z.number().int().gte(0), error: z.string().nullable().optional(), status: z.array(streamStatus).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
};

/**
 * Ingest logs from a GCP Pub/Sub push subscription
 * 
 * POST /gcp/{org_id}/{stream_name}/_sub
 */
export const createApiGcpOrgIdStreamNameSub = async (args: CreateApiGcpOrgIdStreamNameSubArgs, options: CreateApiGcpOrgIdStreamNameSubOptions) => {
const {baseUrl, fetch: fetchFn = fetch, GcpApiKey} = options ?? {}

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

if (GcpApiKey !== undefined) query.set("API-Key", GcpApiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/gcp/${encodeURIComponent(String(args.org_id))}/${encodeURIComponent(String(args.stream_name))}/_sub${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

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

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