import {z} from 'zod'

export type ChainGasBalances = Record<string, never>;

export type Route = {routeId: string, fromAmount: string, chainGasBalances: ChainGasBalances, toAmount: string, usedBridgeNames: Array<'polygon-bridge' | 'hop' | 'anyswap-router-v4' | 'hyphen' | 'arbitrum-bridge' | 'connext'>, totalUserTx: number, totalGasFeesInUsd: number, sender: string, userTxs: Array<Record<string, never>>, serviceTime: number};

export type SingleTxDTO = {route: Route};

export type CreateApiV2BuildTxArgs = {'API-KEY'?: string | undefined, body: SingleTxDTO};

export type CreateApiV2BuildTxOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const approvalData = z.object({minimumApprovalAmount: z.string(), approvalTokenAddress: z.string(), allowanceTarget: z.string(), owner: z.string()});

export const singleTxResponse = z.object({userTxType: z.enum(["approve", "fund-movr", "claim", "dex-swap", "sign"]), txTarget: z.string(), chainId: z.enum(["ETHEREUM", "OPTIMISM", "BSC", "XDAI", "POLYGON", "FANTOM", "ARBITRUM", "AVALANCHE"]), txData: z.string(), txType: z.enum(["eth_sendTransaction", "eth_signMessage"]), value: z.string(), totalUserTx: z.number(), approvalData: approvalData});

export const singleTxOutputDTO = z.object({success: z.boolean(), result: singleTxResponse});

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
};

/**
 * POST /v2/build-tx
 */
export const createApiV2BuildTx = async (args: CreateApiV2BuildTxArgs, options: CreateApiV2BuildTxOptions) => {
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['API-KEY'] != null) headers.set("API-KEY", String(args['API-KEY']))

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