import {z} from 'zod'

export type ApiKpiMetricDateRange = 'LastThirtyVsPrevious' | 'TodayVsYesterday' | 'YesterdayVsPrevious' | 'ThisWeekVsLast' | 'LastWeekVsPrevious' | 'ThisMonthVsLast' | 'LastMonthVsPrevious' | 'ThisYearVsLast' | 'LastYearVsPrevious' | 'AllTime' | 'NotAvailableInThisVersion';

export type GetApiV2EcommerceSummariesArgs = {dateRange?: ApiKpiMetricDateRange | undefined};

export type GetApiV2EcommerceSummariesOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const kpiMetricType = z.enum(["TotalRevenue", "AverageOrderValue", "CustomerLifetimeValue", "TotalOrders", "AverageItemsPerOrder", "AverageDaysToSecondOrder", "Customers", "SinglePurchaseCustomers", "RepeatCustomers", "TotalDelay", "TotalRepeatOrders", "TotalItems"]);

export const kpiMetricValue = z.object({initialTotalValue: z.number().optional(), comparisonTotalValue: z.number().optional()});

export const ecommercePredefinedDateRanges = z.enum(["LastThirtyVsPrevious", "TodayVsYesterday", "YesterdayVsPrevious", "ThisWeekVsLast", "LastWeekVsPrevious", "ThisMonthVsLast", "LastMonthVsPrevious", "ThisYearVsLast", "LastYearVsPrevious", "AllTime", "Custom"]);

export const kpiMetricSummary = z.object({metricType: kpiMetricType.optional(), metricValues: kpiMetricValue.nullable().optional(), dateRange: ecommercePredefinedDateRanges.optional()});

export const reportSummaryOfKpiMetricSummary = z.object({records: z.array(kpiMetricSummary).nullable().optional(), dateRange: ecommercePredefinedDateRanges.nullable().optional(), asOfDate: z.string().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
};

/**
 * Returns the Retail KPI summaries for the specified date range.
 * 
 * GET /v2/ecommerce/summaries
 */
export const getApiV2EcommerceSummaries = async (args: GetApiV2EcommerceSummariesArgs, options?: GetApiV2EcommerceSummariesOptions) => {
const {baseUrl = "https://api.dotdigital.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args.dateRange != null) query.append("dateRange", String(args.dateRange))

const url = `${baseUrl.replace(/\/+$/, '')}/v2/ecommerce/summaries${query.size > 0 ? `?${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(reportSummaryOfKpiMetricSummary, await res.json())
};