import {z} from 'zod'

export type AlertThresholdInput = {code?: (string | null) | undefined, notify_on?: (Array<'triggered' | 'resolved'>) | undefined, recurring?: boolean | undefined, value: number | string};

export type AlertCreateInput = {alert: {code: string, name?: (string | null) | undefined, thresholds: Array<AlertThresholdInput>, alert_type: 'current_usage_amount' | 'billable_metric_current_usage_amount' | 'billable_metric_current_usage_units' | 'lifetime_usage_amount' | 'billable_metric_lifetime_usage_units', billable_metric_code?: (string | null) | undefined}};

export type AlertBatchCreateInput = {alerts: Array<{code: string, name?: (string | null) | undefined, thresholds: Array<AlertThresholdInput>, alert_type: 'current_usage_amount' | 'billable_metric_current_usage_amount' | 'billable_metric_current_usage_units' | 'lifetime_usage_amount' | 'billable_metric_lifetime_usage_units', billable_metric_code?: (string | null) | undefined}>};

export type CreateApiSubscriptionsExternalIdAlertsArgs = {subscription_status?: ('pending' | 'active' | 'terminated' | 'canceled' | 'incomplete') | undefined, body: AlertCreateInput | AlertBatchCreateInput};

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

export const billableMetricFilterObject = z.object({key: z.string(), values: z.array(z.string())});

export const billableMetricObject = z.object({lago_id: z.string(), name: z.string(), code: z.string(), description: z.string().nullable(), recurring: z.boolean(), rounding_function: z.enum(["ceil", "floor", "round", "null"]).nullable(), rounding_precision: z.number().int().nullable(), created_at: z.string(), expression: z.string().nullable(), field_name: z.string().nullable(), aggregation_type: z.enum(["count_agg", "sum_agg", "max_agg", "unique_count_agg", "weighted_sum_agg", "latest_agg"]), weighted_interval: z.enum(["seconds", "null"]).nullable(), filters: z.array(billableMetricFilterObject)});

export const alertThresholdObject = z.object({code: z.string().nullable(), notify_on: z.array(z.enum(["triggered", "resolved"])), recurring: z.boolean(), value: z.string()});

export const alertObject = z.object({lago_id: z.string(), lago_organization_id: z.string(), external_subscription_id: z.string(), lago_wallet_id: z.unknown(), wallet_code: z.unknown(), billable_metric: billableMetricObject.nullable(), alert_type: z.enum(["current_usage_amount", "billable_metric_current_usage_amount", "billable_metric_current_usage_units", "lifetime_usage_amount", "billable_metric_lifetime_usage_units"]), code: z.string(), name: z.string().nullable(), direction: z.enum(["increasing", "decreasing"]), previous_value: z.string(), last_processed_at: z.string().nullable(), thresholds: z.array(alertThresholdObject), created_at: z.string()});

export const alert = z.object({alert: alertObject});

export const paginationMeta = z.object({current_page: z.number().int(), next_page: z.number().int().nullable().optional(), prev_page: z.number().int().nullable().optional(), total_pages: z.number().int(), total_count: z.number().int()});

export const alerts = z.object({alerts: z.array(alertObject), meta: paginationMeta.optional()});

export const createApiSubscriptionsExternalIdAlertsResponse = z.union([alert, alerts]);

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
};

/**
 * Create subscription alert(s)
 * 
 * POST /subscriptions/{external_id}/alerts
 */
export const createApiSubscriptionsExternalIdAlerts = async (args: CreateApiSubscriptionsExternalIdAlertsArgs, options?: CreateApiSubscriptionsExternalIdAlertsOptions) => {
const {baseUrl = "https://api.getlago.com/api/v1", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/subscriptions/${encodeURIComponent(String(args.external_id))}/alerts${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(createApiSubscriptionsExternalIdAlertsResponse, await res.json())
};