import {z} from 'zod'

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

export const kBSourceAttributes = z.object({title: z.string().optional(), source_type: z.enum(["manual", "upload"]).optional(), content: z.string().optional(), format: z.string().optional(), status: z.enum(["pending", "uploading", "indexing", "indexed", "failed"]).optional(), file_size: z.number().int().optional(), chunk_count: z.number().int().optional(), created_at: z.string().optional(), updated_at: z.string().optional()});

export const kBSource = z.object({type: z.string().optional(), id: z.string().optional(), attributes: kBSourceAttributes.optional()});

export const listKBSourcesResponse = z.object({data: z.array(kBSource).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
};

/**
 * List KB Sources
 * 
 * GET /knowledge-base/sources
 */
export const getApiKnowledgeBaseSources = async (options?: GetApiKnowledgeBaseSourcesOptions) => {
const {baseUrl = "https://api.attention.tech/v2", fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/knowledge-base/sources${query.size > 0 ? `?${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(listKBSourcesResponse, await res.json())
};