import {z} from 'zod'

export type GetApiV2LiteserverGetBlockProofArgs = {known_block: string, target_block?: string | undefined, mode: number};

export type GetApiV2LiteserverGetBlockProofOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const blockRaw = z.object({file_hash: z.string(), root_hash: z.string(), seqno: z.number().int(), shard: z.string(), workchain: z.number().int()});

export const getApiV2LiteserverGetBlockProofResponse = z.object({complete: z.boolean(), from: blockRaw, steps: z.array(z.object({lite_server_block_link_back: z.object({dest_proof: z.string(), from: blockRaw, proof: z.string(), state_proof: z.string(), to: blockRaw, to_key_block: z.boolean()}), lite_server_block_link_forward: z.object({config_proof: z.string(), dest_proof: z.string(), from: blockRaw, signatures: z.object({catchain_seqno: z.number().int(), signatures: z.array(z.object({node_id_short: z.string(), signature: z.string()})), validator_set_hash: z.number().int()}), to: blockRaw, to_key_block: z.boolean()})})), to: blockRaw});

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
};

/**
 * Get raw block proof
 * 
 * GET /v2/liteserver/get_block_proof
 */
export const getApiV2LiteserverGetBlockProof = async (args: GetApiV2LiteserverGetBlockProofArgs, options?: GetApiV2LiteserverGetBlockProofOptions) => {
const {baseUrl = "https://tonapi.io", fetch: fetchFn = fetch} = options ?? {}

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

if (args.known_block != null) query.append("known_block", String(args.known_block))
if (args.target_block != null) query.append("target_block", String(args.target_block))
if (args.mode != null) query.append("mode", String(args.mode))

const url = `${baseUrl.replace(/\/+$/, '')}/v2/liteserver/get_block_proof${query.size > 0 ? `?${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(getApiV2LiteserverGetBlockProofResponse, await res.json())
};