import {z} from 'zod'

export type ParseMethod = 'default' | 'pypdf' | 'pdfplumber' | 'unstructured' | 'pymupdf' | 'deepdoc';

export type ChunkStrategy = 'recursive' | 'fixed_size' | 'markdown';

export type IngestionConfig = {deepdoc_processing_mode?: (string | null) | undefined, deepdoc_parallel_threads?: (number | null) | undefined, deepdoc_reserve_cpu?: (number | null) | undefined, deepdoc_limiter_capacity?: (number | null) | undefined, deepdoc_pipeline_monitor?: (boolean | null) | undefined, deepdoc_pipeline_s1_workers?: (number | null) | undefined, deepdoc_gpu_sessions?: (number | null) | undefined, embedding_base_url?: (string | null) | undefined, embedding_api_key?: (string | null) | undefined, embedding_timeout_sec?: (number | null) | undefined, rerank_model_id?: (string | null) | undefined, parse_method?: ParseMethod | undefined, chunk_strategy?: ChunkStrategy | undefined, chunk_method?: (string | null) | undefined, chunk_size?: (number | null) | undefined, chunk_overlap?: number | undefined, headers_to_split_on?: (Array<Array<unknown>> | null) | undefined, separators?: (Array<string> | null) | undefined, use_token_count?: boolean | undefined, tiktoken_encoding?: string | undefined, enable_protected_content?: boolean | undefined, protected_patterns?: (Array<string> | null) | undefined, table_context_size?: number | undefined, image_context_size?: number | undefined, embedding_model_id?: (string | null) | undefined, collection_locked?: boolean | undefined, allow_mixed_parse_methods?: boolean | undefined, skip_config_validation?: boolean | undefined, embedding_batch_size?: number | undefined, embedding_concurrent?: number | undefined, embedding_use_async?: boolean | undefined, max_retries?: number | undefined, retry_delay?: number | undefined};

export type CreateApiApiKbCollectionsCollectionConfigArgs = {collection: string, body: IngestionConfig};

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

export const documentProcessingStatus = z.enum(["pending", "running", "chunked", "partially_embedded", "success", "failed", "cancelled"]);

export const collectionOperationDetail = z.object({doc_id: z.string(), status: documentProcessingStatus, message: z.string().nullable().optional()});

export const collectionOperationResult = z.object({status: z.string(), collection: z.string(), message: z.string(), warnings: z.array(z.string()).optional(), affected_documents: z.array(collectionOperationDetail).optional(), deleted_counts: z.record(z.string(), z.number().int()).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
};

/**
 * Save Collection Config
 * 
 * POST /api/kb/collections/{collection}/config
 */
export const createApiApiKbCollectionsCollectionConfig = async (args: CreateApiApiKbCollectionsCollectionConfigArgs, options: CreateApiApiKbCollectionsCollectionConfigOptions) => {
const {baseUrl, fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

if (HTTPBearer !== undefined) headers.set('authorization', `Bearer ${HTTPBearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/kb/collections/${encodeURIComponent(String(args.collection))}/config${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(collectionOperationResult, await res.json())
};