import {z} from 'zod'

export type DistanceTypeEnum = 'cosine' | 'l2';

export type ChatQueryRequest = {distance_type?: DistanceTypeEnum | undefined, model?: string | undefined, chat_model: string, query: string, prompt?: string | undefined, tags?: Array<string> | undefined, top_k?: number | undefined, threshold?: number | undefined, use_full_content?: boolean | undefined};

export type CreateApiV1DocumentsChatArgs = {body: ChatQueryRequest};

export type CreateApiV1DocumentsChatOptions = {baseUrl: string, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const statusEnum = z.enum(["pending", "processing", "available", "deleted", "error"]);

export const documentList = z.object({id: z.string(), created_at: z.string(), status: statusEnum, name: z.string().max(255), model: z.string(), chunk_size: z.number().int(), chunk_count: z.number().int(), tags: z.array(z.string()).optional(), error_message: z.string()});

export const queryResultChunk = z.object({document: documentList, chunk_index: z.number().int(), distance: z.number(), content: z.string(), metadata: z.record(z.string(), z.unknown())});

export const queryResultDocument = z.object({id: z.string(), name: z.string(), tags: z.array(z.string()).optional(), model: z.string(), chunk_size: z.number().int(), distance: z.number(), content: z.string()});

export const chatResultSource = z.union([queryResultChunk, queryResultDocument]);

export const chatResult = z.object({answer: z.string(), sources: z.array(chatResultSource)});

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
};

/**
 * POST /v1/documents/chat/
 */
export const createApiV1DocumentsChat = async (args: CreateApiV1DocumentsChatArgs, options: CreateApiV1DocumentsChatOptions) => {
const {baseUrl, 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 (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/documents/chat/${query.size > 0 ? `?${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(chatResult, await res.json())
};