import {z} from 'zod'

export type BatchQueryItem = {sql: string, queryType?: ('json' | 'arrow' | 'exec') | undefined};

export type BatchExecutionMode = 'serial' | 'parallel';

export type ComputeResourceRequest = {cpu?: string | undefined, memory?: string | undefined, timeoutSeconds?: number | undefined};

export type SubmitDuckDBBatchJobRequest = {queries: Array<BatchQueryItem>, mode?: BatchExecutionMode | undefined, resources?: ComputeResourceRequest | undefined, integrationId?: (string | string | null) | undefined, blockId?: (string | string | null) | undefined};

export type CreateApiV4QueryJobsBatchRunArgs = {body: SubmitDuckDBBatchJobRequest};

export type CreateApiV4QueryJobsBatchRunOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const duckDBBatchQueryResult = z.object({queryIndex: z.number().int(), data: z.array(z.record(z.string(), z.unknown())).optional(), rowCount: z.number().int()});

export const duckDBBatchJobResultResponse = z.object({jobId: z.string(), results: z.array(duckDBBatchQueryResult), durationMs: z.number().int().nullable().optional()});

export const responseMeta = z.object({requestId: z.string().optional(), timestamp: z.string().optional(), durationMs: z.number().int().nullable().optional()});

export const successResponseDuckDBBatchJobResultResponse = z.object({success: z.literal(true), data: duckDBBatchJobResultResponse, meta: responseMeta.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
};

/**
 * Run a batch of DuckDB queries synchronously and return results
 * 
 * POST /v4/query/jobs/batch/run
 */
export const createApiV4QueryJobsBatchRun = async (args: CreateApiV4QueryJobsBatchRunArgs, options: CreateApiV4QueryJobsBatchRunOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/v4/query/jobs/batch/run${query.size > 0 ? `?${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(successResponseDuckDBBatchJobResultResponse, await res.json())
};