import {z} from 'zod'

export type GetApiApiV1McpEventsSubscriptionsOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const mCPEventsDeliveryStatus = z.object({active: z.boolean(), failed_since: z.string().optional(), last_delivery_at: z.string().optional(), last_error: z.string().optional()}).and(z.record(z.string(), z.unknown()));

export const mCPEventsSubscriptionStatus = z.object({dead_letter_count: z.number().int(), delivery: mCPEventsDeliveryStatus, end_reason: z.string().optional(), failed_attempts: z.number().int(), id: z.string(), issue_uid: z.string().optional(), name: z.string(), pending_control: z.string().optional(), project_uids: z.array(z.string()).optional(), recipient: z.string(), refresh_before: z.string().nullable(), state: z.string()}).and(z.record(z.string(), z.unknown()));

export const mCPEventsSubscriptionsResponseBody = z.object({enabled: z.boolean(), reason: z.string().optional(), subscriptions: z.array(mCPEventsSubscriptionStatus)}).and(z.record(z.string(), z.unknown()));

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 the caller's MCP Events subscriptions and whether Events is running
 * 
 * GET /api/v1/mcp-events/subscriptions
 */
export const getApiApiV1McpEventsSubscriptions = async (options: GetApiApiV1McpEventsSubscriptionsOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/mcp-events/subscriptions${query.size > 0 ? `?${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(mCPEventsSubscriptionsResponseBody, await res.json())
};