import {z} from 'zod'

export type OffersSvcOfferType = 'ONRAMP' | 'OFFRAMP';

export type GetApiOffersBestOfferArgs = {unitAmount?: number | undefined, fiatUnitAmount?: number | undefined, network?: string | undefined, tokenSymbol?: string | undefined, fiatSymbol?: string | undefined, offerType?: OffersSvcOfferType | undefined, paymentChannel?: string | undefined, exemptedMerchants?: Array<string> | undefined, prioritizeIp?: boolean | undefined};

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

export const offersSvcOfferType = z.enum(["ONRAMP", "OFFRAMP"]);

export const offersSvcOfferBehavior = z.enum(["FIXED", "FLEXIBLE"]);

export const offersSvcOfferPaymentChannelColor = z.object({bg: z.string(), fg: z.string()});

export const offersSvcOfferPaymentMethod = z.object({channelId: z.string().optional(), channelName: z.string().optional(), channelType: z.string().optional(), color: offersSvcOfferPaymentChannelColor.optional(), id: z.string().optional()});

export const offersSvcOfferPaymentChannel = z.object({channelId: z.string().optional(), channelName: z.string().optional(), channelType: z.string().optional(), color: offersSvcOfferPaymentChannelColor.optional()});

export const offersSvcOfferStatus = z.enum(["PENDING", "ACTIVE", "OFFLINE", "LOW_BALANCE", "LIMIT_REACHED"]);

export const offersSvcPartnerStats = z.object({partnerId: z.string().optional(), averageRating: z.number().optional(), totalTransactions: z.number().optional(), tradeCount: z.number().optional(), completionPercentage: z.number().optional(), averageResponseTime: z.number().optional()});

export const offersSvcTradeMode = z.enum(["P2P", "IP", "OTC"]);

export const offersSvcFeeConfig = z.object({tradeType: offersSvcOfferType.optional(), tradeMode: offersSvcTradeMode.optional(), base: z.number(), tradePercentage: z.number(), cap: z.number().optional(), network: z.string()});

export const offersSvcTradeCriteria = z.object({verifiedKyc: z.boolean().optional()});

export const offersSvcFulfillOrderAs = z.enum(["BUSINESS", "PERSONAL"]);

export const offersSvcAutoRefillConfig = z.object({threshold: z.number(), amount: z.number()});

export const offersSvcOfferDto = z.object({offerId: z.string(), userId: z.string(), network: z.string(), tokenSymbol: z.string(), fiatSymbol: z.string(), offerType: offersSvcOfferType, behaviour: offersSvcOfferBehavior, totalUnit: z.number(), tradedUnit: z.number(), lockedUnit: z.number(), rate: z.number(), rateCap: z.number().optional(), paymentMethods: z.array(offersSvcOfferPaymentMethod), paymentChannels: z.array(offersSvcOfferPaymentChannel).optional(), flexibleOfferMargin: z.number().optional(), status: offersSvcOfferStatus, partnerDisplayName: z.string(), partnerRating: z.number(), partnerStats: offersSvcPartnerStats.optional(), statusReason: z.string().optional(), tradeMinimumLimit: z.number(), tradeMaximumLimit: z.number(), previewImageUrl: z.string().optional(), maxTimeout: z.object({deposit: z.number().int().optional(), confirmation: z.number().int().optional()}).optional(), feeConfig: offersSvcFeeConfig.optional(), feeConfigs: z.array(offersSvcFeeConfig).optional(), tradeCriteria: offersSvcTradeCriteria.optional(), autoResponseMessage: z.string().optional(), adNote: z.string().optional(), tradeRequestBroadcastId: z.string().optional(), isPrivate: z.boolean().optional(), isRateHidden: z.boolean().optional(), instantPayEnabled: z.boolean().optional(), instantPayLimit: z.number().optional(), instantPayMinimum: z.number().optional(), instantPayAccountId: z.string().optional(), customPayinProvider: z.string().optional(), createdAt: z.string(), updatedAt: z.string(), editedAt: z.string(), partnerLastActiveAt: z.string(), primaryEscrowAddress: z.string().optional(), fiatTradeMinimumLimit: z.number().optional(), fiatTradeMaximumLimit: z.number().optional(), maxFiatLimit: z.number(), availableUnits: z.number(), fulfillOrderAs: offersSvcFulfillOrderAs.optional(), autoRefillEnabled: z.boolean().optional(), autoRefillConfig: offersSvcAutoRefillConfig.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
};

/**
 * Get best offer for trade parameters
 * 
 * GET /offers/best-offer
 */
export const getApiOffersBestOffer = async (args: GetApiOffersBestOfferArgs, options?: GetApiOffersBestOfferOptions) => {
const {baseUrl = "https://external.dev.onboardpay.co", fetch: fetchFn = fetch} = options ?? {}

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

if (args.unitAmount != null) query.append("unitAmount", String(args.unitAmount))
if (args.fiatUnitAmount != null) query.append("fiatUnitAmount", String(args.fiatUnitAmount))
if (args.network != null) query.append("network", String(args.network))
if (args.tokenSymbol != null) query.append("tokenSymbol", String(args.tokenSymbol))
if (args.fiatSymbol != null) query.append("fiatSymbol", String(args.fiatSymbol))
if (args.offerType != null) query.append("offerType", String(args.offerType))
if (args.paymentChannel != null) query.append("paymentChannel", String(args.paymentChannel))
for (const item of args.exemptedMerchants ?? []) query.append("exemptedMerchants", String(item))
if (args.prioritizeIp != null) query.append("prioritizeIp", String(args.prioritizeIp))

const url = `${baseUrl.replace(/\/+$/, '')}/offers/best-offer${query.size > 0 ? `?${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(offersSvcOfferDto, await res.json())
};