import {z} from 'zod'

export type GetApiApiV1MasSgsYieldsArgs = {tenor?: (string | null) | undefined, days?: (number | null) | undefined};

export type GetApiApiV1MasSgsYieldsOptions = {baseUrl?: string | undefined, APIKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const masBenchmark = z.object({issue_code: z.string().nullable().optional(), coupon_pct: z.union([z.number().int(), z.number()]).nullable().optional(), maturity_date: z.string().nullable().optional()}).and(z.record(z.string(), z.unknown()));

export const masLevel = z.object({date: z.string().nullable().optional(), price: z.union([z.number().int(), z.number()]).nullable().optional(), yield: z.union([z.number().int(), z.number()]).nullable().optional()}).and(z.record(z.string(), z.unknown()));

export const masTenor = z.object({tenor: z.string().nullable().optional(), kind: z.string().nullable().optional(), benchmark: masBenchmark.nullable().optional(), count: z.union([z.number().int(), z.number()]).nullable().optional(), data: z.array(masLevel).nullable().optional()}).and(z.record(z.string(), z.unknown()));

export const masSgsYieldsData = z.object({area: z.string().nullable().optional(), area_name: z.string().nullable().optional(), currency: z.string().nullable().optional(), frequency: z.string().nullable().optional(), yield_unit: z.string().nullable().optional(), price_unit: z.string().nullable().optional(), basis: z.string().nullable().optional(), source: z.string().nullable().optional(), license: z.string().nullable().optional(), terms_url: z.string().nullable().optional(), attribution: z.string().nullable().optional(), modified_notice: z.string().nullable().optional(), latest_date: z.string().nullable().optional(), days_available: z.union([z.number().int(), z.number()]).nullable().optional(), count: z.union([z.number().int(), z.number()]).nullable().optional(), tenors: z.array(masTenor).nullable().optional()}).and(z.record(z.string(), z.unknown()));

export const sugraMeta = z.object({endpoint: z.string(), data_time: z.string(), response_time: z.string(), provider: z.string(), data_age_days: z.number().nullable().optional(), source: z.string().nullable().optional(), attribution: z.string().nullable().optional(), source_url: z.string().nullable().optional(), citation: z.string().nullable().optional(), fallback_used: z.boolean().nullable().optional(), fallback_chain: z.array(z.string()).nullable().optional(), cached: z.boolean().nullable().optional(), stale: z.boolean().nullable().optional(), stale_since: z.string().nullable().optional(), period: z.string().nullable().optional(), notes: z.string().nullable().optional()});

export const envelopeMasSgsYieldsData = z.object({data: masSgsYieldsData, meta: sugraMeta});

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
};

/**
 * Singapore Government Securities benchmark yields
 * 
 * GET /api/v1/mas/sgs-yields
 */
export const getApiApiV1MasSgsYields = async (args: GetApiApiV1MasSgsYieldsArgs, options?: GetApiApiV1MasSgsYieldsOptions) => {
const {baseUrl = "https://sugra.ai", fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (args.tenor != null) query.append("tenor", String(args.tenor))
if (args.days != null) query.append("days", String(args.days))
if (APIKeyHeader !== undefined) headers.set("x-api-key", APIKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/mas/sgs-yields${query.size > 0 ? `?${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(envelopeMasSgsYieldsData, await res.json())
};