import {z} from 'zod'

export type OrderSide = 0 | 1;

export type GetApiV1PositionArgs = {order?: ('asc' | 'desc') | undefined, limit?: number | undefined, cursor?: string | undefined, subaccountId: string, productIds?: Array<string> | undefined, open?: boolean | undefined, orderBy?: ('size' | 'createdAt' | 'updatedAt' | 'realizedPnl') | undefined, createdAfter?: number | undefined, createdBefore?: number | undefined, side?: OrderSide | undefined, isLiquidated?: boolean | undefined};

export type GetApiV1PositionOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const orderSide = z.union([z.literal(0), z.literal(1)]);

export const positionDto = z.object({cost: z.string(), createdAt: z.number().int(), feesAccruedUsd: z.string(), fundingAccruedUsd: z.string(), fundingUsd: z.string(), id: z.string(), isLiquidated: z.boolean(), liquidationPrice: z.string().optional(), productId: z.string(), realizedPnl: z.string(), side: orderSide, size: z.string(), totalDecreaseNotional: z.string(), totalDecreaseQuantity: z.string(), totalIncreaseNotional: z.string(), totalIncreaseQuantity: z.string(), unrealizedPnl: z.string().optional(), updatedAt: z.number().int(), wasDeleveraged: z.boolean()});

export const pageOfPositionDtos = z.object({data: z.array(positionDto), hasNext: z.boolean(), nextCursor: 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
};

/**
 * Returns a filtered list of positions for a given subaccount
 * 
 * GET /v1/position
 */
export const getApiV1Position = async (args: GetApiV1PositionArgs, options?: GetApiV1PositionOptions) => {
const {baseUrl = "https://api.ethereal.trade", fetch: fetchFn = fetch} = options ?? {}

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

if (args.order != null) query.append("order", String(args.order))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.cursor != null) query.append("cursor", String(args.cursor))
if (args.subaccountId != null) query.append("subaccountId", String(args.subaccountId))
for (const item of args.productIds ?? []) query.append("productIds", String(item))
if (args.open != null) query.append("open", String(args.open))
if (args.orderBy != null) query.append("orderBy", String(args.orderBy))
if (args.createdAfter != null) query.append("createdAfter", String(args.createdAfter))
if (args.createdBefore != null) query.append("createdBefore", String(args.createdBefore))
if (args.side != null) query.append("side", String(args.side))
if (args.isLiquidated != null) query.append("isLiquidated", String(args.isLiquidated))

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