import {z} from 'zod'

export type GetApiV1ConnectionsArgs = {fromChain: string, toChain: string, fromToken?: string | undefined, toToken?: string | undefined, chainTypes?: string | undefined, allowBridges?: Array<string> | undefined, denyBridges?: Array<string> | undefined, preferBridges?: Array<string> | undefined, allowExchanges?: Array<string> | undefined, denyExchanges?: Array<string> | undefined, preferExchanges?: Array<string> | undefined, allowSwitchChain?: boolean | undefined, allowDestinationCall?: boolean | undefined, 'x-lifi-api-key'?: string | undefined};

export type GetApiV1ConnectionsOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const baseToken = z.object({address: z.string(), chainId: z.number()});

export const connection = z.object({fromChainId: z.number(), toChainId: z.number(), fromTokens: z.array(baseToken), toTokens: z.array(baseToken)});

export const connectionsResponse = z.object({connections: z.array(connection).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 all possible connections between two chains.
 * 
 * GET /v1/connections
 */
export const getApiV1Connections = async (args: GetApiV1ConnectionsArgs, options?: GetApiV1ConnectionsOptions) => {
const {baseUrl = "https://li.quest", fetch: fetchFn = fetch} = options ?? {}

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

if (args.fromChain != null) query.append("fromChain", String(args.fromChain))
if (args.toChain != null) query.append("toChain", String(args.toChain))
if (args.fromToken != null) query.append("fromToken", String(args.fromToken))
if (args.toToken != null) query.append("toToken", String(args.toToken))
if (args.chainTypes != null) query.append("chainTypes", String(args.chainTypes))
for (const item of args.allowBridges ?? []) query.append("allowBridges", String(item))
for (const item of args.denyBridges ?? []) query.append("denyBridges", String(item))
for (const item of args.preferBridges ?? []) query.append("preferBridges", String(item))
for (const item of args.allowExchanges ?? []) query.append("allowExchanges", String(item))
for (const item of args.denyExchanges ?? []) query.append("denyExchanges", String(item))
for (const item of args.preferExchanges ?? []) query.append("preferExchanges", String(item))
if (args.allowSwitchChain != null) query.append("allowSwitchChain", String(args.allowSwitchChain))
if (args.allowDestinationCall != null) query.append("allowDestinationCall", String(args.allowDestinationCall))
if (args['x-lifi-api-key'] != null) headers.set("x-lifi-api-key", String(args['x-lifi-api-key']))

const url = `${baseUrl.replace(/\/+$/, '')}/v1/connections${query.size > 0 ? `?${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(connectionsResponse, await res.json())
};