import {z} from 'zod'

export type GetApiV1ConsensusHoldingsArgs = {institutions?: string | undefined, reportDate?: string | undefined, minFunds?: number | undefined, limit?: number | undefined};

export type GetApiV1ConsensusHoldingsOptions = {baseUrl?: string | undefined, ApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const consensusFundDto = z.object({name: z.string().nullable().optional(), cik: z.string().nullable().optional()});

export const consensusHoldingDto = z.object({ticker: z.string().nullable().optional(), companyName: z.string().nullable().optional(), heldByFundCount: z.number().int().optional(), totalFundCount: z.number().int().optional(), combinedValue: z.number().int().optional()});

export const consensusHoldingsResponse = z.object({reportDate: z.string().nullable().optional(), funds: z.array(consensusFundDto).nullable().optional(), unresolved: z.array(z.string()).nullable().optional(), data: z.array(consensusHoldingDto).nullable().optional(), total: z.number().int().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
};

/**
 * The consensus (combined) portfolio of 2-25 institutions for their latest common 13F report date — stocks ranked by how many funds hold them, then by combined published position value. Values normally use report-date closing prices, may fall back to filer values, and can be zero when unavailable. Answers "what do these funds agree on?".
 * 
 * GET /v1/consensus-holdings
 */
export const getApiV1ConsensusHoldings = async (args: GetApiV1ConsensusHoldingsArgs, options?: GetApiV1ConsensusHoldingsOptions) => {
const {baseUrl = "https://api.equibles.com", fetch: fetchFn = fetch, ApiKey} = options ?? {}

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

if (args.institutions != null) query.append("institutions", String(args.institutions))
if (args.reportDate != null) query.append("reportDate", String(args.reportDate))
if (args.minFunds != null) query.append("minFunds", String(args.minFunds))
if (args.limit != null) query.append("limit", String(args.limit))
if (ApiKey !== undefined) headers.set('authorization', `Bearer ${ApiKey}`)

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