import {z} from 'zod'

export type InputMappingLoadRequest = {input: Array<{source: string, source_branch_id?: number | undefined, destination: string, description?: (string | null) | undefined, days?: (number | null) | undefined, changed_since?: (string | null) | undefined, columns?: Array<string> | undefined, column_types?: (Array<{source: string, description?: (string | null) | undefined, type?: string | undefined, destination?: string | undefined, length?: (string | number) | undefined, nullable?: boolean | undefined, convert_empty_values_to_null?: boolean | undefined}>) | undefined, where_column?: string | undefined, where_values?: Array<string> | undefined, where_operator?: ('eq' | 'ne') | undefined, limit?: number | undefined, overwrite?: boolean | undefined, load_type?: ('COPY' | 'CLONE' | 'VIEW' | 'AUTO') | undefined, use_view?: boolean | undefined, keep_internal_timestamp_column?: boolean | undefined, incremental?: boolean | undefined, file_type?: string | undefined, backend?: string | undefined}>, preserve?: boolean | undefined};

export type CreateApiV2StorageInputMappingLoadPreviewArgs = {backend?: (string | null) | undefined, body: InputMappingLoadRequest};

export type CreateApiV2StorageInputMappingLoadPreviewOptions = {baseUrl?: string | undefined, StorageKey?: string | undefined, fetch?: typeof fetch | undefined};

export const inputMappingLoadPreviewResponse = z.object({input: z.array(z.object({source: z.string(), destination: z.string(), loadType: z.enum(["COPY", "CLONE", "VIEW"]), possibleLoadTypes: z.array(z.enum(["COPY", "CLONE", "VIEW"]))}))});

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
};

/**
 * Input mapping load preview
 * 
 * POST /v2/storage/input-mapping-load/preview
 * 
 * Also accepts auth: ManageKey, BearerAuth
 */
export const createApiV2StorageInputMappingLoadPreview = async (args: CreateApiV2StorageInputMappingLoadPreviewArgs, options?: CreateApiV2StorageInputMappingLoadPreviewOptions) => {
const {baseUrl = "https://connection.keboola.com", fetch: fetchFn = fetch, StorageKey} = options ?? {}

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

if (args.backend != null) query.append("backend", String(args.backend))
if (StorageKey !== undefined) headers.set("X-StorageApi-Token", StorageKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/storage/input-mapping-load/preview${query.size > 0 ? `?${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(inputMappingLoadPreviewResponse, await res.json())
};