import {z} from 'zod'

export type StreamConfig = {table: string, many?: (boolean | null) | undefined, mode?: ('append' | 'merge') | undefined, primary_key?: (Array<string> | null) | undefined, wait?: boolean | undefined, tags?: ({[key: string]: string} | null) | undefined, trace?: ({[key: string]: string} | null) | undefined};

export type StreamRequest = {data?: ({[key: string]: unknown} | Array<{[key: string]: unknown}> | null) | undefined, config: StreamConfig};

export type CreateApiV2StreamArgs = {body: StreamRequest};

export type CreateApiV2StreamOptions = {baseUrl: string, AsyncAPIKeyHeaderAuthenticator?: string | undefined, fetch?: typeof fetch | undefined};

export const streamResponse = z.object({success: z.boolean(), request_id: z.string(), stream_id: z.string(), table: z.string(), accepted: z.number().int(), successful_rows: z.number().int(), rejected_rows: z.number().int(), partitions: z.array(z.string()), snapshot_id: z.string().nullable().optional(), warnings: z.array(z.string()).optional(), errors: z.array(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
};

/**
 * Ingest JSON/NDJSON data into Ducklake
 * 
 * POST /v2/stream
 */
export const createApiV2Stream = async (args: CreateApiV2StreamArgs, options: CreateApiV2StreamOptions) => {
const {baseUrl, fetch: fetchFn = fetch, AsyncAPIKeyHeaderAuthenticator} = options ?? {}

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

if (AsyncAPIKeyHeaderAuthenticator !== undefined) headers.set("Authorization", AsyncAPIKeyHeaderAuthenticator)

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