import {z} from 'zod'

export type GetApiPartnersStatsArgs = {days?: number | undefined};

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

export const globalPartnerSummary = z.object({total_referrers: z.number().int(), total_referrals: z.number().int(), paid_referrals: z.number().int(), conversion_rate_percent: z.number(), avg_earnings_per_referral_kopeks: z.number()});

export const payoutsByPeriod = z.object({all_time_kopeks: z.number().int(), year_kopeks: z.number().int(), month_kopeks: z.number().int(), week_kopeks: z.number().int(), today_kopeks: z.number().int()});

export const newReferralsByPeriod = z.object({today: z.number().int(), week: z.number().int(), month: z.number().int()});

export const globalPartnerStats = z.object({summary: globalPartnerSummary, payouts: payoutsByPeriod, new_referrals: newReferralsByPeriod});

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
};

/**
 * Get Global Partner Stats
 * 
 * GET /partners/stats
 */
export const getApiPartnersStats = async (args: GetApiPartnersStatsArgs, options: GetApiPartnersStatsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/partners/stats${query.size > 0 ? `?${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(globalPartnerStats, await res.json())
};