import {z} from 'zod'

export type GetApiV1LastSignalsVenueSymbolArgs = {venue: 'stocks' | 'crypto' | 'forex' | 'commodities', symbol: string, interval?: ('1m' | '5m' | '15m' | '30m' | '1h' | '1d' | '1w' | '1mo') | undefined};

export type GetApiV1LastSignalsVenueSymbolOptions = {baseUrl?: string | undefined, ApiKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const signalVerdict = z.enum(["strong_sell", "sell", "neutral", "buy", "strong_buy"]);

export const signalCounts = z.object({buy: z.number().int().optional(), neutral: z.number().int().optional(), sell: z.number().int().optional()});

export const signalSummary = z.object({signal: signalVerdict.optional(), score: z.number().optional(), counts: signalCounts.optional()});

export const signalVote = z.enum(["buy", "neutral", "sell"]);

export const signalIndicator = z.object({name: z.string().optional(), value: z.number().optional(), signal_line: z.number().optional(), k: z.number().optional(), d: z.number().optional(), vote: signalVote.optional()});

export const signalGroup = z.object({signal: signalVerdict.optional(), score: z.number().optional(), indicators: z.array(signalIndicator).optional()});

export const signalPrice = z.object({close: z.number().optional(), bar_status: z.enum(["forming", "closed"]).optional()});

export const liveSignal = z.object({summary: signalSummary.optional(), oscillators: signalGroup.optional(), moving_averages: signalGroup.optional(), price: signalPrice.optional()});

export const signalMeta = z.object({as_of: z.string().optional(), symbol: z.string().optional(), interval: z.string().optional()});

export const liveSignalResponse = z.object({data: liveSignal.optional(), meta: signalMeta.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
};

/**
 * Live technical signal
 * 
 * GET /v1/last/signals/{venue}/{symbol}
 * 
 * Also accepts auth: ApiKeyQuery
 */
export const getApiV1LastSignalsVenueSymbol = async (args: GetApiV1LastSignalsVenueSymbolArgs, options?: GetApiV1LastSignalsVenueSymbolOptions) => {
const {baseUrl = "https://api.sifting.io", fetch: fetchFn = fetch, ApiKeyHeader} = options ?? {}

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

if (args.interval != null) query.append("interval", String(args.interval))
if (ApiKeyHeader !== undefined) headers.set("X-API-Key", ApiKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/last/signals/${encodeURIComponent(String(args.venue))}/${encodeURIComponent(String(args.symbol))}${query.size > 0 ? `?${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(liveSignalResponse, await res.json())
};