import {z} from 'zod'

export type GetApiV2BlockchainMasterchainHeadOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const blockCurrencyCollection = z.object({grams: z.number().int(), other: z.array(z.object({id: z.number().int(), value: z.string()}))});

export const blockValueFlow = z.object({burned: blockCurrencyCollection.optional(), created: blockCurrencyCollection, exported: blockCurrencyCollection, fees_collected: blockCurrencyCollection, fees_imported: blockCurrencyCollection, from_prev_blk: blockCurrencyCollection, imported: blockCurrencyCollection, minted: blockCurrencyCollection, recovered: blockCurrencyCollection, to_next_blk: blockCurrencyCollection});

export const blockchainBlock = z.object({after_merge: z.boolean(), after_split: z.boolean(), before_split: z.boolean(), created_by: z.string(), end_lt: z.number().int(), file_hash: z.string(), gen_catchain_seqno: z.number().int(), gen_software_capabilities: z.number().int().optional(), gen_software_version: z.number().int().optional(), gen_utime: z.number().int(), global_id: z.number().int(), in_msg_descr_length: z.number().int(), key_block: z.boolean(), master_ref: z.string().optional(), min_ref_mc_seqno: z.number().int(), out_msg_descr_length: z.number().int(), prev_key_block_seqno: z.number().int(), prev_refs: z.array(z.string()), rand_seed: z.string(), root_hash: z.string(), seqno: z.number().int(), shard: z.string(), start_lt: z.number().int(), tx_quantity: z.number().int(), value_flow: blockValueFlow, version: z.number().int(), vert_seqno: z.number().int(), want_merge: z.boolean(), want_split: z.boolean(), workchain_id: z.number().int()});

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 last known masterchain block
 * 
 * GET /v2/blockchain/masterchain-head
 */
export const getApiV2BlockchainMasterchainHead = async (options?: GetApiV2BlockchainMasterchainHeadOptions) => {
const {baseUrl = "https://tonapi.io", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/v2/blockchain/masterchain-head${query.size > 0 ? `?${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(blockchainBlock, await res.json())
};