import {z} from 'zod'

export type GetApiV1HoldersArgs = {pageSize: unknown, userAddress?: string | undefined, tokenName: string};

export type GetApiV1HoldersOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const holderItemResponseDto = z.object({owner: z.string(), quantity: z.string()});

export const holderListSuccessEnvelopeDto = z.object({data: z.array(holderItemResponseDto), error: z.literal(false), message: z.string(), status: z.number()});

export const holderTier = z.union([z.literal(0), z.literal(1), z.literal(2), z.literal(3), z.literal(4), z.literal(5)]);

export const holderTierResponseDto = z.object({tier: holderTier, tierName: z.string()});

export const userHolderResponseDto = z.object({holderTier: z.union([holderTierResponseDto, z.unknown()]), isCreator: z.boolean(), percentage: z.number().nullable(), quantity: z.string().nullable(), rank: z.number().nullable(), tokenName: z.string(), userAddress: z.string()});

export const userHolderSuccessEnvelopeDto = z.object({data: userHolderResponseDto, error: z.literal(false), message: z.string(), status: z.number()});

export const getApiV1HoldersResponse = z.union([holderListSuccessEnvelopeDto, userHolderSuccessEnvelopeDto]);

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 token holders with query filtering
 * 
 * GET /v1/holders
 */
export const getApiV1Holders = async (args: GetApiV1HoldersArgs, options?: GetApiV1HoldersOptions) => {
const {baseUrl = "https://lpad-backend.stage.defi.ovh.gala.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args.pageSize != null) query.append("pageSize", String(args.pageSize))
if (args.userAddress != null) query.append("userAddress", String(args.userAddress))
if (args.tokenName != null) query.append("tokenName", String(args.tokenName))

const url = `${baseUrl.replace(/\/+$/, '')}/v1/holders${query.size > 0 ? `?${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(getApiV1HoldersResponse, await res.json())
};