import {z} from 'zod'

export type GetApiTransactionIndexIndexArgs = {index: number};

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

export const batchEntry = z.object({index: z.number().optional(), blockNumber: z.number().optional(), timestamp: z.number().optional(), submitter: z.string().optional(), size: z.number().optional(), root: z.string().optional(), prevTotalElements: z.number().optional(), extraData: z.string().optional(), l1TransactionHash: z.string().optional()});

export const eCDSASignature = z.object({r: z.string().optional(), s: z.string().optional(), v: z.number().optional()});

export const decodedSequencerBatchTransaction = z.object({sig: eCDSASignature.optional(), gasLimit: z.number().optional(), gasPrice: z.number().optional(), nonce: z.number().optional(), target: z.string().optional(), data: z.string().optional()});

export const transactionEntry = z.object({index: z.number().optional(), batchIndex: z.number().optional(), data: z.string().optional(), blockNumber: z.number().optional(), timestamp: z.number().optional(), gasLimit: z.number().optional(), target: z.string().optional(), origin: z.string().optional(), queueOrigin: z.string().optional(), queueIndex: z.number().optional(), decoded: decodedSequencerBatchTransaction.optional()});

export const transactionResponse = z.object({batch: batchEntry.optional(), transaction: transactionEntry.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
};

/**
 * Returns a Canonical Transaction Chain transaction by index
 * 
 * GET /transaction/index/{index}
 */
export const getApiTransactionIndexIndex = async (args: GetApiTransactionIndexIndexArgs, options: GetApiTransactionIndexIndexOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/transaction/index/${encodeURIComponent(String(args.index))}${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(transactionResponse, await res.json())
};