import {z} from 'zod'

export type CreateApiImportArgs = {strict: '0' | '1', project_id: string, 'Content-Type'?: ('application/json' | 'application/x-ndjson') | undefined, 'Content-Encoding'?: 'gzip' | undefined, body: Array<{event: string, properties: {time: number, distinct_id: string, $insert_id: string} | {[key: string]: unknown}}>};

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

export const createApiImportResponse = z.object({code: z.number().int().optional(), num_records_imported: z.number().int().optional(), status: 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
};

/**
 * Import Events
 * 
 * POST /import
 * 
 * Also accepts auth: ProjectSecret, OAuthToken
 */
export const createApiImport = async (args: CreateApiImportArgs, options?: CreateApiImportOptions) => {
const {baseUrl = "https://mixpanel.com/api/query", fetch: fetchFn = fetch, ServiceAccount} = options ?? {}

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

if (args.strict != null) query.append("strict", String(args.strict))
if (args.project_id != null) query.append("project_id", String(args.project_id))
if (args['Content-Type'] != null) headers.set("Content-Type", String(args['Content-Type']))
if (args['Content-Encoding'] != null) headers.set("Content-Encoding", String(args['Content-Encoding']))
if (ServiceAccount !== undefined) headers.set('authorization', `Basic ${btoa(`${ServiceAccount.username}:${ServiceAccount.password}`)}`)

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