import {z} from 'zod'

export type SubmitTxOutpoint = {transactionId: string, index: number};

export type SubmitTxInput = {previousOutpoint: SubmitTxOutpoint, signatureScript: string, sequence: number, sigOpCount: number};

export type SubmitTxScriptPublicKey = {version: number, scriptPublicKey: string};

export type SubmitTxOutput = {amount: number, scriptPublicKey: SubmitTxScriptPublicKey};

export type SubmitTxModel = {version: number, inputs: Array<SubmitTxInput>, outputs: Array<SubmitTxOutput>, lockTime?: number | undefined, subnetworkId?: string | undefined};

export type SubmitTransactionRequest = {transaction: SubmitTxModel, allowOrphan?: boolean | undefined};

export type CreateApiTransactionsArgs = {replaceByFee?: boolean | undefined, body: SubmitTransactionRequest};

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

export const submitTransactionResponse = z.object({transactionId: z.string().optional(), error: z.string().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
};

/**
 * Submit A New Transaction
 * 
 * POST /transactions
 */
export const createApiTransactions = async (args: CreateApiTransactionsArgs, options: CreateApiTransactionsOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.replaceByFee != null) query.append("replaceByFee", String(args.replaceByFee))

const url = `${baseUrl.replace(/\/+$/, '')}/transactions${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(submitTransactionResponse, await res.json())
};