import {z} from 'zod'

export type PaymentInfo = {paymentId: string, amount: number, currency: string, paymentType: string, metadata: string, paymentMethodType: string, paymentMethod: string, cardIsin: string};

export type RankingAlgorithm = 'SR_BASED_ROUTING' | 'PL_BASED_ROUTING' | 'NTW_BASED_ROUTING';

export type OpenRouterDecideGatewayRequest = {paymentInfo: PaymentInfo, merchantId: string, eligibleGatewayList?: (Array<string> | null) | undefined, rankingAlgorithm?: (RankingAlgorithm | null) | undefined, eliminationEnabled?: (boolean | null) | undefined};

export type CreateApiRoutingEvaluateArgs = {body: OpenRouterDecideGatewayRequest};

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

export const priorityLogicData = z.object({name: z.string().nullable().optional(), status: z.string().nullable().optional(), failure_reason: z.string().nullable().optional()});

export const priorityLogicOutput = z.object({isEnforcement: z.boolean().nullable().optional(), gws: z.array(z.string()).nullable().optional(), priorityLogicTag: z.string().nullable().optional(), gatewayReferenceIds: z.object({}).nullable().optional(), primaryLogic: priorityLogicData.nullable().optional(), fallbackLogic: priorityLogicData.nullable().optional()});

export const decideGatewayResponse = z.object({decided_gateway: z.string().nullable().optional(), gateway_priority_map: z.record(z.string(), z.number()).nullable().optional(), filter_wise_gateways: z.object({}).nullable().optional(), priority_logic_tag: z.string().nullable().optional(), routing_approach: z.string().nullable().optional(), gateway_before_evaluation: z.string().nullable().optional(), priority_logic_output: priorityLogicOutput.nullable().optional(), reset_approach: z.string().nullable().optional(), routing_dimension: z.string().nullable().optional(), routing_dimension_level: z.string().nullable().optional(), is_scheduled_outage: z.boolean().nullable().optional(), is_dynamic_mga_enabled: z.boolean().nullable().optional(), gateway_mga_id_map: z.object({}).nullable().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
};

/**
 * Routing - Evaluate
 * 
 * POST /routing/evaluate
 */
export const createApiRoutingEvaluate = async (args: CreateApiRoutingEvaluateArgs, options: CreateApiRoutingEvaluateOptions) => {
const {baseUrl, fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (apiKey !== undefined) headers.set("Authorization", apiKey)

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