import {z} from 'zod'

export type StakingAddress = string;

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

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

export const textBigInt = z.string();

export const validatorHistoryPoint = z.object({epoch: z.number().int(), active_balance: textBigInt.optional(), active_shares: textBigInt.optional(), debonding_balance: textBigInt.optional(), debonding_shares: textBigInt.optional(), num_delegators: z.number().int().optional()});

export const validatorHistory = z.object({total_count: z.number().int(), is_total_count_clipped: z.boolean(), address: z.string().optional(), history: z.array(validatorHistoryPoint)});

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 historical information for a single validator.
 * 
 * GET /consensus/validators/{address}/history
 */
export const getApiConsensusValidatorsAddressHistory = async (args: GetApiConsensusValidatorsAddressHistoryArgs, options?: GetApiConsensusValidatorsAddressHistoryOptions) => {
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))
if (args.from != null) query.append("from", String(args.from))
if (args.to != null) query.append("to", String(args.to))

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