import {z} from 'zod'

export type StakingAddress = string;

export type GetApiConsensusAccountsAddressDelegationsArgs = {limit?: number | undefined, offset?: number | undefined, address: StakingAddress};

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

export const textBigInt = z.string();

export const delegation = z.object({amount: textBigInt, shares: textBigInt, validator: z.string(), delegator: z.string()});

export const delegationList = z.object({total_count: z.number().int(), is_total_count_clipped: z.boolean(), delegations: z.array(delegation)});

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
};

/**
 * Returns an account's delegations.
 * 
 * GET /consensus/accounts/{address}/delegations
 */
export const getApiConsensusAccountsAddressDelegations = async (args: GetApiConsensusAccountsAddressDelegationsArgs, options?: GetApiConsensusAccountsAddressDelegationsOptions) => {
const {baseUrl = "https://nexus.oasis.io/v1", fetch: fetchFn = fetch} = 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))

const url = `${baseUrl.replace(/\/+$/, '')}/consensus/accounts/${encodeURIComponent(String(args.address))}/delegations${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(delegationList, await res.json())
};