import {z} from 'zod'

export type GetApiV1FlowTickerAggregateArgs = {ticker: string, start_time: string, end_time: string, option_type?: ('call' | 'put' | 'all') | undefined, min_premium?: number | undefined, exclude_multi_leg?: boolean | undefined, min_dte?: number | undefined, max_dte?: number | undefined, date?: string | undefined};

export type GetApiV1FlowTickerAggregateOptions = {baseUrl?: string | undefined, bearerApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const windowAggregateScores = z.object({vwf: z.number(), sdf: z.number(), fir: z.number(), composite: z.number()});

export const windowPremiumSplit = z.object({bullishPremium: z.number(), bearishPremium: z.number(), neutralPremium: z.number(), netPremium: z.number(), bullishCount: z.number().int().gte(0), bearishCount: z.number().int().gte(0), neutralCount: z.number().int().gte(0), sweepPremium: z.number()});

export const windowInterpretation = z.object({bias: z.enum(["bullish", "bearish", "neutral", "mixed"]), signalStrength: z.enum(["strong", "moderate", "weak"])});

export const flowAggregateResponse = z.object({ticker: z.string(), startTime: z.string(), endTime: z.string(), tradeCount: z.number().int().gte(0), sweepCount: z.number().int().gte(0), totalPremium: z.number(), aggregate: windowAggregateScores, premiumSplit: windowPremiumSplit, interpretation: windowInterpretation, queryTimeMs: z.number().int().gte(0)});

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

export const flowAggregateSuccess = z.object({data: flowAggregateResponse, 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
};

/**
 * Aggregate flow over an arbitrary [start, end] window
 * 
 * GET /v1/flow/{ticker}/aggregate
 */
export const getApiV1FlowTickerAggregate = async (args: GetApiV1FlowTickerAggregateArgs, options?: GetApiV1FlowTickerAggregateOptions) => {
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.start_time != null) query.append("start_time", String(args.start_time))
if (args.end_time != null) query.append("end_time", String(args.end_time))
if (args.option_type != null) query.append("option_type", String(args.option_type))
if (args.min_premium != null) query.append("min_premium", String(args.min_premium))
if (args.exclude_multi_leg != null) query.append("exclude_multi_leg", String(args.exclude_multi_leg))
if (args.min_dte != null) query.append("min_dte", String(args.min_dte))
if (args.max_dte != null) query.append("max_dte", String(args.max_dte))
if (args.date != null) query.append("date", String(args.date))
if (bearerApiKey !== undefined) headers.set('authorization', `Bearer ${bearerApiKey}`)

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