import {z} from 'zod'

export type GetApiV1FlowTickerHistoricalCompareArgs = {ticker: string, date?: string | undefined};

export type GetApiV1FlowTickerHistoricalCompareOptions = {baseUrl?: string | undefined, bearerApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const currentMetrics = z.object({totalPremium: z.number(), totalVolume: z.number().int().gte(0), callPremium: z.number(), putPremium: z.number(), netPremium: z.number(), callPutRatio: z.number(), callVolume: z.number().int().gte(0), putVolume: z.number().int().gte(0)});

export const historicalMetrics = z.object({avgPremium: z.number(), avgVolume: z.number(), avgNetPremium: z.number(), avgCallPutRatio: z.number(), avgCallPremium: z.number(), avgPutPremium: z.number(), daysAnalyzed: z.number().int().gte(0)});

export const vsAverage = z.object({premiumVsAvg: z.number(), volumeVsAvg: z.number(), netPremiumVsAvg: z.number()});

export const percentileRankings = z.object({premiumPercentile: z.number().int().gte(0).lte(100), volumePercentile: z.number().int().gte(0).lte(100), netPremiumPercentile: z.number().int().gte(0).lte(100)});

export const similarDay = z.object({date: z.string(), netPremium: z.number(), totalPremium: z.number(), similarityScore: z.number()});

export const historicalCompareResponse = z.object({ticker: z.string(), date: z.string(), current: currentMetrics, historical: historicalMetrics, vsAverage: vsAverage, percentileRankings: percentileRankings, similarDays: z.array(similarDay)});

export const meta = z.object({timestamp: z.string(), requestId: z.string()});

export const historicalCompareSuccess = z.object({data: historicalCompareResponse, meta: meta});

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
};

/**
 * Today's flow vs trailing average (with similar-days lookback)
 * 
 * GET /v1/flow/{ticker}/historical-compare
 */
export const getApiV1FlowTickerHistoricalCompare = async (args: GetApiV1FlowTickerHistoricalCompareArgs, options?: GetApiV1FlowTickerHistoricalCompareOptions) => {
const {baseUrl = "https://flow-api.skylit.ai", fetch: fetchFn = fetch, bearerApiKey} = options ?? {}

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

if (args.date != null) query.append("date", String(args.date))
if (bearerApiKey !== undefined) headers.set('authorization', `Bearer ${bearerApiKey}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/flow/${encodeURIComponent(String(args.ticker))}/historical-compare${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(historicalCompareSuccess, await res.json())
};