import {z} from 'zod'

export type GetApiRetentionArgs = {project_id: number, workspace_id?: number | undefined, from_date: string, to_date: string, retention_type?: ('birth' | 'compounded') | undefined, born_event?: string | undefined, event?: string | undefined, born_where?: string | undefined, where?: string | undefined, interval?: number | undefined, interval_count?: number | undefined, unit?: ('day' | 'week' | 'month') | undefined, unbounded_retention?: boolean | undefined, on?: string | undefined, limit?: number | undefined};

export type GetApiRetentionOptions = {baseUrl?: string | undefined, ServiceAccount?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const getApiRetentionResponse = z.record(z.string(), z.object({counts: z.array(z.number().int()).optional(), first: z.number().int().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
};

/**
 * Query Retention Report
 * 
 * GET /retention
 * 
 * Also accepts auth: ProjectSecret
 */
export const getApiRetention = async (args: GetApiRetentionArgs, options?: GetApiRetentionOptions) => {
const {baseUrl = "https://mixpanel.com/api/query", fetch: fetchFn = fetch, ServiceAccount} = options ?? {}

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

if (args.project_id != null) query.append("project_id", String(args.project_id))
if (args.workspace_id != null) query.append("workspace_id", String(args.workspace_id))
if (args.from_date != null) query.append("from_date", String(args.from_date))
if (args.to_date != null) query.append("to_date", String(args.to_date))
if (args.retention_type != null) query.append("retention_type", String(args.retention_type))
if (args.born_event != null) query.append("born_event", String(args.born_event))
if (args.event != null) query.append("event", String(args.event))
if (args.born_where != null) query.append("born_where", String(args.born_where))
if (args.where != null) query.append("where", String(args.where))
if (args.interval != null) query.append("interval", String(args.interval))
if (args.interval_count != null) query.append("interval_count", String(args.interval_count))
if (args.unit != null) query.append("unit", String(args.unit))
if (args.unbounded_retention != null) query.append("unbounded_retention", String(args.unbounded_retention))
if (args.on != null) query.append("on", String(args.on))
if (args.limit != null) query.append("limit", String(args.limit))
if (ServiceAccount !== undefined) headers.set('authorization', `Basic ${btoa(`${ServiceAccount.username}:${ServiceAccount.password}`)}`)

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