import {z} from 'zod'

export type Aggregations = 'minute' | 'hour' | 'day' | 'week' | 'month' | 'quarter' | 'year';

export type MetricsFields = 'timestamp' | 'total_events' | 'guest_sessions' | 'non_guest_sessions' | 'unique_sessions' | 'unique_ids' | 'session_starts';

export type GetApiV2TenantSlugMetricsArgs = {tenant_slug: string, start_date: string, end_date: string, aggregation?: (Aggregations | null) | undefined, metric?: (MetricsFields | null) | undefined};

export type GetApiV2TenantSlugMetricsOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const metricDataPoint = z.object({timestamp: z.string(), total_events: z.number().int().gte(0).nullable().optional(), guest_sessions: z.number().int().gte(0).nullable().optional(), non_guest_sessions: z.number().int().gte(0).nullable().optional(), unique_sessions: z.number().int().gte(0).nullable().optional(), unique_ids: z.number().int().gte(0).nullable().optional(), session_starts: z.number().int().gte(0).nullable().optional()});

export const metricListResponse = z.object({metrics: z.array(metricDataPoint)});

export const aPIResponseMetricListResponse = z.object({data: metricListResponse});

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 tenant metrics
 * 
 * GET /v2/{tenant_slug}/metrics
 */
export const getApiV2TenantSlugMetrics = async (args: GetApiV2TenantSlugMetricsArgs, options?: GetApiV2TenantSlugMetricsOptions) => {
const {baseUrl = "https://api.demo-retail.urbanfox.io", fetch: fetchFn = fetch, oauth2} = options ?? {}

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

if (args.start_date != null) query.append("start_date", String(args.start_date))
if (args.end_date != null) query.append("end_date", String(args.end_date))
if (args.aggregation != null) query.append("aggregation", String(args.aggregation))
if (args.metric != null) query.append("metric", String(args.metric))
if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/${encodeURIComponent(String(args.tenant_slug))}/metrics${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(aPIResponseMetricListResponse, await res.json())
};