import {z} from 'zod'

export type NewRange = {start_idx: string, end_idx: string};

export type NewSnippetReference = {characters: NewRange, speakers: NewRange, transcript_version: 'V1' | 'V2'};

export type NewVideoTimespan = {start_time: number, end_time: number, duration?: number | undefined};

export type NewLibraryItemInfo = {my_library: boolean, folder_path?: string | undefined};

export type CreateSnippetRequest = {user_uuid: string, conversation_id: string, reference?: NewSnippetReference | undefined, video: NewVideoTimespan, notes?: string | undefined, title?: string | undefined, in_library?: boolean | undefined, library_item_info?: NewLibraryItemInfo | undefined, internal: boolean, notify_views: boolean};

export type CreateApiSnippetsArgs = {body: CreateSnippetRequest};

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

export const createdSnippetResponse = z.object({url: z.string(), id: z.string(), share_code: 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
};

/**
 * Create Snippet
 * 
 * POST /snippets
 */
export const createApiSnippets = async (args: CreateApiSnippetsArgs, options?: CreateApiSnippetsOptions) => {
const {baseUrl = "https://api.attention.tech/v2", fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

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

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