import {z} from 'zod'

export type CreateApiPipelinesOutputStreamArgs = {response_schema_v?: ('v1' | 'v2') | undefined, body: {sql: string}};

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

export const resourceId = z.string();

export const streamType = z.enum(["APPEND", "CHANGE"]);

export const recordSchema = z.array(z.object({name: z.string().optional(), type: z.string().optional()}));

export const physicalField = z.object({kind: z.literal("physical"), name: z.string().optional(), type: z.string().optional()});

export const computedField = z.object({kind: z.literal("computed"), name: z.string().optional(), expression: z.string().optional()});

export const metadataField = z.object({kind: z.literal("metadata"), name: z.string().optional(), type: z.string().optional(), key: z.string().optional()});

export const schemaV2 = z.object({fields: z.array(z.discriminatedUnion("kind", [physicalField, computedField, metadataField])).optional(), watermarks: z.array(z.object({name: z.string().optional(), expression: z.string().optional()})).optional(), constraints: z.object({primary_key: z.array(z.string()).optional()}).optional()});

export const stream = z.union([z.object({id: resourceId.optional(), type: streamType.optional(), name: z.string().optional(), description: z.string().optional(), watermark: z.string().optional(), schema: recordSchema, schema_v2: schemaV2.optional(), properties: z.record(z.string(), z.string().nullable()).optional(), partition_key: z.array(z.string()).optional(), create_time: z.string().optional(), update_time: z.string().optional()}), z.object({id: resourceId.optional(), type: streamType.optional(), name: z.string().optional(), description: z.string().optional(), watermark: z.string().optional(), schema: recordSchema.optional(), schema_v2: schemaV2, properties: z.record(z.string(), z.string().nullable()).optional(), partition_key: z.array(z.string()).optional(), create_time: z.string().optional(), update_time: 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
};

/**
 * Get the output stream given a pipeline sql.
 * 
 * POST /pipelines/outputStream
 * 
 * Also accepts auth: oauth2
 */
export const createApiPipelinesOutputStream = async (args: CreateApiPipelinesOutputStreamArgs, options?: CreateApiPipelinesOutputStreamOptions) => {
const {baseUrl = "https://replace-with-account.api.decodable.co/v1alpha2", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args.response_schema_v != null) query.append("response_schema_v", String(args.response_schema_v))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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