import {z} from 'zod'

export type GetApiV1StocksTickerCustomerConcentrationArgs = {ticker: string};

export type GetApiV1StocksTickerCustomerConcentrationOptions = {baseUrl?: string | undefined, ApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const concentrationFigureDto = z.object({basis: z.string().nullable().optional(), customerCount: z.number().int().nullable().optional(), percent: z.number().optional(), period: z.string().nullable().optional(), quote: z.string().nullable().optional()});

export const customerConcentrationResponse = z.object({ticker: z.string().nullable().optional(), companyName: z.string().nullable().optional(), hasDisclosure: z.boolean().optional(), form: z.string().nullable().optional(), filedDate: z.string().nullable().optional(), filingUrl: z.string().nullable().optional(), headline: concentrationFigureDto.optional(), figures: z.array(concentrationFigureDto).nullable().optional(), missReason: z.string().nullable().optional(), lastScannedForm: z.string().nullable().optional(), lastScannedFiledDate: z.string().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
};

/**
 * A company's verified narrative customer-concentration disclosure ("one customer accounted for 31% of revenue"): each figure's basis, customer count, percentage, period, and verbatim quote, with the source filing. hasDisclosure is false when this REST surface returns no narrative row — missReason then says why: current tagged XBRL served by the MCP tool, a scanned filing that stated nothing, a company outside coverage because it files only foreign private issuer reports (20-F, 40-F, 6-K) and no 10-K or 10-Q, or a company not processed yet. A newer narrative supersedes stale tags. Never a statement of no risk.
 * 
 * GET /v1/stocks/{ticker}/customer-concentration
 */
export const getApiV1StocksTickerCustomerConcentration = async (args: GetApiV1StocksTickerCustomerConcentrationArgs, options?: GetApiV1StocksTickerCustomerConcentrationOptions) => {
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 (ApiKey !== undefined) headers.set('authorization', `Bearer ${ApiKey}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/stocks/${encodeURIComponent(String(args.ticker))}/customer-concentration${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(customerConcentrationResponse, await res.json())
};