import {z} from 'zod'

export type GetApiKnowledgeConfigArgs = {db_id?: (string | null) | undefined, knowledge_id?: (string | null) | undefined};

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

export const readerSchema = z.object({id: z.string(), name: z.string().nullable().optional(), description: z.string().nullable().optional(), chunkers: z.array(z.string()).nullable().optional()});

export const chunkerSchema = z.object({key: z.string(), name: z.string().nullable().optional(), description: z.string().nullable().optional(), metadata: z.record(z.string(), z.unknown()).nullable().optional()});

export const vectorDbSchema = z.object({id: z.string(), name: z.string().nullable().optional(), description: z.string().nullable().optional(), search_types: z.array(z.string()).nullable().optional()});

export const remoteContentSourceSchema = z.object({id: z.string(), name: z.string(), type: z.string(), metadata: z.record(z.string(), z.unknown()).nullable().optional(), prefix: z.string().nullable().optional()});

export const configResponseSchema = z.object({readers: z.record(z.string(), readerSchema).nullable().optional(), readersForType: z.record(z.string(), z.array(z.string())).nullable().optional(), chunkers: z.record(z.string(), chunkerSchema).nullable().optional(), filters: z.array(z.string()).nullable().optional(), vector_dbs: z.array(vectorDbSchema).nullable().optional(), remote_content_sources: z.array(remoteContentSourceSchema).nullable().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 Config
 * 
 * GET /knowledge/config
 */
export const getApiKnowledgeConfig = async (args: GetApiKnowledgeConfigArgs, options: GetApiKnowledgeConfigOptions) => {
const {baseUrl, fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/knowledge/config${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(configResponseSchema, await res.json())
};