import {z} from 'zod'

export type GetApiV1ChainNameBlockV2BlockHeightArgs = {chainName: string, blockHeight: string};

export type GetApiV1ChainNameBlockV2BlockHeightOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiV1ChainNameBlockV2BlockHeightResponse = z.object({updated_at: z.string().optional(), chain_id: z.number().int().optional(), chain_name: z.string().optional(), items: z.array(z.object({block_hash: z.string().optional(), signed_at: z.string().optional(), height: z.number().int().optional(), block_parent_hash: z.string().optional(), extra_data: z.string().optional(), miner_address: z.string().optional(), mining_cost: z.number().int().optional(), gas_used: z.number().int().optional(), gas_limit: z.number().int().optional(), transactions_link: z.string().optional()})).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
};

/**
 * Fetches a single block, for example to render it in a block explorer.
 * 
 * GET /v1/{chainName}/block_v2/{blockHeight}/
 */
export const getApiV1ChainNameBlockV2BlockHeight = async (args: GetApiV1ChainNameBlockV2BlockHeightArgs, options?: GetApiV1ChainNameBlockV2BlockHeightOptions) => {
const {baseUrl = "https://api.covalenthq.com", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/${encodeURIComponent(String(args.chainName))}/block_v2/${encodeURIComponent(String(args.blockHeight))}/${query.size > 0 ? `?${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(getApiV1ChainNameBlockV2BlockHeightResponse, await res.json())
};